1cdedef59SAnirudh Venkataramanan // SPDX-License-Identifier: GPL-2.0 2cdedef59SAnirudh Venkataramanan /* Copyright (c) 2018, Intel Corporation. */ 3cdedef59SAnirudh Venkataramanan 4cdedef59SAnirudh Venkataramanan /* The driver transmit and receive code */ 5cdedef59SAnirudh Venkataramanan 6cdedef59SAnirudh Venkataramanan #include <linux/prefetch.h> 7cdedef59SAnirudh Venkataramanan #include <linux/mm.h> 8efc2214bSMaciej Fijalkowski #include <linux/bpf_trace.h> 9efc2214bSMaciej Fijalkowski #include <net/xdp.h> 100891d6d4SKrzysztof Kazimierczak #include "ice_txrx_lib.h" 11efc2214bSMaciej Fijalkowski #include "ice_lib.h" 12cdedef59SAnirudh Venkataramanan #include "ice.h" 135f6aa50eSAnirudh Venkataramanan #include "ice_dcb_lib.h" 142d4238f5SKrzysztof Kazimierczak #include "ice_xsk.h" 15cdedef59SAnirudh Venkataramanan 162b245cb2SAnirudh Venkataramanan #define ICE_RX_HDR_SIZE 256 172b245cb2SAnirudh Venkataramanan 18148beb61SHenry Tieman #define FDIR_DESC_RXDID 0x40 19cac2a27cSHenry Tieman #define ICE_FDIR_CLEAN_DELAY 10 20cac2a27cSHenry Tieman 21cac2a27cSHenry Tieman /** 22cac2a27cSHenry Tieman * ice_prgm_fdir_fltr - Program a Flow Director filter 23cac2a27cSHenry Tieman * @vsi: VSI to send dummy packet 24cac2a27cSHenry Tieman * @fdir_desc: flow director descriptor 25cac2a27cSHenry Tieman * @raw_packet: allocated buffer for flow director 26cac2a27cSHenry Tieman */ 27cac2a27cSHenry Tieman int 28cac2a27cSHenry Tieman ice_prgm_fdir_fltr(struct ice_vsi *vsi, struct ice_fltr_desc *fdir_desc, 29cac2a27cSHenry Tieman u8 *raw_packet) 30cac2a27cSHenry Tieman { 31cac2a27cSHenry Tieman struct ice_tx_buf *tx_buf, *first; 32cac2a27cSHenry Tieman struct ice_fltr_desc *f_desc; 33cac2a27cSHenry Tieman struct ice_tx_desc *tx_desc; 34cac2a27cSHenry Tieman struct ice_ring *tx_ring; 35cac2a27cSHenry Tieman struct device *dev; 36cac2a27cSHenry Tieman dma_addr_t dma; 37cac2a27cSHenry Tieman u32 td_cmd; 38cac2a27cSHenry Tieman u16 i; 39cac2a27cSHenry Tieman 40cac2a27cSHenry Tieman /* VSI and Tx ring */ 41cac2a27cSHenry Tieman if (!vsi) 42cac2a27cSHenry Tieman return -ENOENT; 43cac2a27cSHenry Tieman tx_ring = vsi->tx_rings[0]; 44cac2a27cSHenry Tieman if (!tx_ring || !tx_ring->desc) 45cac2a27cSHenry Tieman return -ENOENT; 46cac2a27cSHenry Tieman dev = tx_ring->dev; 47cac2a27cSHenry Tieman 48cac2a27cSHenry Tieman /* we are using two descriptors to add/del a filter and we can wait */ 49cac2a27cSHenry Tieman for (i = ICE_FDIR_CLEAN_DELAY; ICE_DESC_UNUSED(tx_ring) < 2; i--) { 50cac2a27cSHenry Tieman if (!i) 51cac2a27cSHenry Tieman return -EAGAIN; 52cac2a27cSHenry Tieman msleep_interruptible(1); 53cac2a27cSHenry Tieman } 54cac2a27cSHenry Tieman 55cac2a27cSHenry Tieman dma = dma_map_single(dev, raw_packet, ICE_FDIR_MAX_RAW_PKT_SIZE, 56cac2a27cSHenry Tieman DMA_TO_DEVICE); 57cac2a27cSHenry Tieman 58cac2a27cSHenry Tieman if (dma_mapping_error(dev, dma)) 59cac2a27cSHenry Tieman return -EINVAL; 60cac2a27cSHenry Tieman 61cac2a27cSHenry Tieman /* grab the next descriptor */ 62cac2a27cSHenry Tieman i = tx_ring->next_to_use; 63cac2a27cSHenry Tieman first = &tx_ring->tx_buf[i]; 64cac2a27cSHenry Tieman f_desc = ICE_TX_FDIRDESC(tx_ring, i); 65cac2a27cSHenry Tieman memcpy(f_desc, fdir_desc, sizeof(*f_desc)); 66cac2a27cSHenry Tieman 67cac2a27cSHenry Tieman i++; 68cac2a27cSHenry Tieman i = (i < tx_ring->count) ? i : 0; 69cac2a27cSHenry Tieman tx_desc = ICE_TX_DESC(tx_ring, i); 70cac2a27cSHenry Tieman tx_buf = &tx_ring->tx_buf[i]; 71cac2a27cSHenry Tieman 72cac2a27cSHenry Tieman i++; 73cac2a27cSHenry Tieman tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; 74cac2a27cSHenry Tieman 75cac2a27cSHenry Tieman memset(tx_buf, 0, sizeof(*tx_buf)); 76cac2a27cSHenry Tieman dma_unmap_len_set(tx_buf, len, ICE_FDIR_MAX_RAW_PKT_SIZE); 77cac2a27cSHenry Tieman dma_unmap_addr_set(tx_buf, dma, dma); 78cac2a27cSHenry Tieman 79cac2a27cSHenry Tieman tx_desc->buf_addr = cpu_to_le64(dma); 80cac2a27cSHenry Tieman td_cmd = ICE_TXD_LAST_DESC_CMD | ICE_TX_DESC_CMD_DUMMY | 81cac2a27cSHenry Tieman ICE_TX_DESC_CMD_RE; 82cac2a27cSHenry Tieman 83cac2a27cSHenry Tieman tx_buf->tx_flags = ICE_TX_FLAGS_DUMMY_PKT; 84cac2a27cSHenry Tieman tx_buf->raw_buf = raw_packet; 85cac2a27cSHenry Tieman 86cac2a27cSHenry Tieman tx_desc->cmd_type_offset_bsz = 87cac2a27cSHenry Tieman ice_build_ctob(td_cmd, 0, ICE_FDIR_MAX_RAW_PKT_SIZE, 0); 88cac2a27cSHenry Tieman 89cac2a27cSHenry Tieman /* Force memory write to complete before letting h/w know 90cac2a27cSHenry Tieman * there are new descriptors to fetch. 91cac2a27cSHenry Tieman */ 92cac2a27cSHenry Tieman wmb(); 93cac2a27cSHenry Tieman 94cac2a27cSHenry Tieman /* mark the data descriptor to be watched */ 95cac2a27cSHenry Tieman first->next_to_watch = tx_desc; 96cac2a27cSHenry Tieman 97cac2a27cSHenry Tieman writel(tx_ring->next_to_use, tx_ring->tail); 98cac2a27cSHenry Tieman 99cac2a27cSHenry Tieman return 0; 100cac2a27cSHenry Tieman } 101148beb61SHenry Tieman 102cdedef59SAnirudh Venkataramanan /** 103cdedef59SAnirudh Venkataramanan * ice_unmap_and_free_tx_buf - Release a Tx buffer 104cdedef59SAnirudh Venkataramanan * @ring: the ring that owns the buffer 105cdedef59SAnirudh Venkataramanan * @tx_buf: the buffer to free 106cdedef59SAnirudh Venkataramanan */ 107cdedef59SAnirudh Venkataramanan static void 108cdedef59SAnirudh Venkataramanan ice_unmap_and_free_tx_buf(struct ice_ring *ring, struct ice_tx_buf *tx_buf) 109cdedef59SAnirudh Venkataramanan { 110cdedef59SAnirudh Venkataramanan if (tx_buf->skb) { 111148beb61SHenry Tieman if (tx_buf->tx_flags & ICE_TX_FLAGS_DUMMY_PKT) 112148beb61SHenry Tieman devm_kfree(ring->dev, tx_buf->raw_buf); 113148beb61SHenry Tieman else if (ice_ring_is_xdp(ring)) 114efc2214bSMaciej Fijalkowski page_frag_free(tx_buf->raw_buf); 115efc2214bSMaciej Fijalkowski else 116cdedef59SAnirudh Venkataramanan dev_kfree_skb_any(tx_buf->skb); 117cdedef59SAnirudh Venkataramanan if (dma_unmap_len(tx_buf, len)) 118cdedef59SAnirudh Venkataramanan dma_unmap_single(ring->dev, 119cdedef59SAnirudh Venkataramanan dma_unmap_addr(tx_buf, dma), 120cdedef59SAnirudh Venkataramanan dma_unmap_len(tx_buf, len), 121cdedef59SAnirudh Venkataramanan DMA_TO_DEVICE); 122cdedef59SAnirudh Venkataramanan } else if (dma_unmap_len(tx_buf, len)) { 123cdedef59SAnirudh Venkataramanan dma_unmap_page(ring->dev, 124cdedef59SAnirudh Venkataramanan dma_unmap_addr(tx_buf, dma), 125cdedef59SAnirudh Venkataramanan dma_unmap_len(tx_buf, len), 126cdedef59SAnirudh Venkataramanan DMA_TO_DEVICE); 127cdedef59SAnirudh Venkataramanan } 128cdedef59SAnirudh Venkataramanan 129cdedef59SAnirudh Venkataramanan tx_buf->next_to_watch = NULL; 130cdedef59SAnirudh Venkataramanan tx_buf->skb = NULL; 131cdedef59SAnirudh Venkataramanan dma_unmap_len_set(tx_buf, len, 0); 132cdedef59SAnirudh Venkataramanan /* tx_buf must be completely set up in the transmit path */ 133cdedef59SAnirudh Venkataramanan } 134cdedef59SAnirudh Venkataramanan 135cdedef59SAnirudh Venkataramanan static struct netdev_queue *txring_txq(const struct ice_ring *ring) 136cdedef59SAnirudh Venkataramanan { 137cdedef59SAnirudh Venkataramanan return netdev_get_tx_queue(ring->netdev, ring->q_index); 138cdedef59SAnirudh Venkataramanan } 139cdedef59SAnirudh Venkataramanan 140cdedef59SAnirudh Venkataramanan /** 141cdedef59SAnirudh Venkataramanan * ice_clean_tx_ring - Free any empty Tx buffers 142cdedef59SAnirudh Venkataramanan * @tx_ring: ring to be cleaned 143cdedef59SAnirudh Venkataramanan */ 144cdedef59SAnirudh Venkataramanan void ice_clean_tx_ring(struct ice_ring *tx_ring) 145cdedef59SAnirudh Venkataramanan { 146cdedef59SAnirudh Venkataramanan u16 i; 147cdedef59SAnirudh Venkataramanan 1481742b3d5SMagnus Karlsson if (ice_ring_is_xdp(tx_ring) && tx_ring->xsk_pool) { 1492d4238f5SKrzysztof Kazimierczak ice_xsk_clean_xdp_ring(tx_ring); 1502d4238f5SKrzysztof Kazimierczak goto tx_skip_free; 1512d4238f5SKrzysztof Kazimierczak } 1522d4238f5SKrzysztof Kazimierczak 153cdedef59SAnirudh Venkataramanan /* ring already cleared, nothing to do */ 154cdedef59SAnirudh Venkataramanan if (!tx_ring->tx_buf) 155cdedef59SAnirudh Venkataramanan return; 156cdedef59SAnirudh Venkataramanan 1572f2da36eSAnirudh Venkataramanan /* Free all the Tx ring sk_buffs */ 158cdedef59SAnirudh Venkataramanan for (i = 0; i < tx_ring->count; i++) 159cdedef59SAnirudh Venkataramanan ice_unmap_and_free_tx_buf(tx_ring, &tx_ring->tx_buf[i]); 160cdedef59SAnirudh Venkataramanan 1612d4238f5SKrzysztof Kazimierczak tx_skip_free: 162c6dfd690SBruce Allan memset(tx_ring->tx_buf, 0, sizeof(*tx_ring->tx_buf) * tx_ring->count); 163cdedef59SAnirudh Venkataramanan 164cdedef59SAnirudh Venkataramanan /* Zero out the descriptor ring */ 165cdedef59SAnirudh Venkataramanan memset(tx_ring->desc, 0, tx_ring->size); 166cdedef59SAnirudh Venkataramanan 167cdedef59SAnirudh Venkataramanan tx_ring->next_to_use = 0; 168cdedef59SAnirudh Venkataramanan tx_ring->next_to_clean = 0; 169cdedef59SAnirudh Venkataramanan 170cdedef59SAnirudh Venkataramanan if (!tx_ring->netdev) 171cdedef59SAnirudh Venkataramanan return; 172cdedef59SAnirudh Venkataramanan 173cdedef59SAnirudh Venkataramanan /* cleanup Tx queue statistics */ 174cdedef59SAnirudh Venkataramanan netdev_tx_reset_queue(txring_txq(tx_ring)); 175cdedef59SAnirudh Venkataramanan } 176cdedef59SAnirudh Venkataramanan 177cdedef59SAnirudh Venkataramanan /** 178cdedef59SAnirudh Venkataramanan * ice_free_tx_ring - Free Tx resources per queue 179cdedef59SAnirudh Venkataramanan * @tx_ring: Tx descriptor ring for a specific queue 180cdedef59SAnirudh Venkataramanan * 181cdedef59SAnirudh Venkataramanan * Free all transmit software resources 182cdedef59SAnirudh Venkataramanan */ 183cdedef59SAnirudh Venkataramanan void ice_free_tx_ring(struct ice_ring *tx_ring) 184cdedef59SAnirudh Venkataramanan { 185cdedef59SAnirudh Venkataramanan ice_clean_tx_ring(tx_ring); 186cdedef59SAnirudh Venkataramanan devm_kfree(tx_ring->dev, tx_ring->tx_buf); 187cdedef59SAnirudh Venkataramanan tx_ring->tx_buf = NULL; 188cdedef59SAnirudh Venkataramanan 189cdedef59SAnirudh Venkataramanan if (tx_ring->desc) { 190cdedef59SAnirudh Venkataramanan dmam_free_coherent(tx_ring->dev, tx_ring->size, 191cdedef59SAnirudh Venkataramanan tx_ring->desc, tx_ring->dma); 192cdedef59SAnirudh Venkataramanan tx_ring->desc = NULL; 193cdedef59SAnirudh Venkataramanan } 194cdedef59SAnirudh Venkataramanan } 195cdedef59SAnirudh Venkataramanan 196cdedef59SAnirudh Venkataramanan /** 1972b245cb2SAnirudh Venkataramanan * ice_clean_tx_irq - Reclaim resources after transmit completes 1982b245cb2SAnirudh Venkataramanan * @tx_ring: Tx ring to clean 1992b245cb2SAnirudh Venkataramanan * @napi_budget: Used to determine if we are in netpoll 2002b245cb2SAnirudh Venkataramanan * 2012b245cb2SAnirudh Venkataramanan * Returns true if there's any budget left (e.g. the clean is finished) 2022b245cb2SAnirudh Venkataramanan */ 2032fb0821fSJesse Brandeburg static bool ice_clean_tx_irq(struct ice_ring *tx_ring, int napi_budget) 2042b245cb2SAnirudh Venkataramanan { 2052b245cb2SAnirudh Venkataramanan unsigned int total_bytes = 0, total_pkts = 0; 2062fb0821fSJesse Brandeburg unsigned int budget = ICE_DFLT_IRQ_WORK; 2072fb0821fSJesse Brandeburg struct ice_vsi *vsi = tx_ring->vsi; 2082b245cb2SAnirudh Venkataramanan s16 i = tx_ring->next_to_clean; 2092b245cb2SAnirudh Venkataramanan struct ice_tx_desc *tx_desc; 2102b245cb2SAnirudh Venkataramanan struct ice_tx_buf *tx_buf; 2112b245cb2SAnirudh Venkataramanan 2122b245cb2SAnirudh Venkataramanan tx_buf = &tx_ring->tx_buf[i]; 2132b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, i); 2142b245cb2SAnirudh Venkataramanan i -= tx_ring->count; 2152b245cb2SAnirudh Venkataramanan 2162fb0821fSJesse Brandeburg prefetch(&vsi->state); 2172fb0821fSJesse Brandeburg 2182b245cb2SAnirudh Venkataramanan do { 2192b245cb2SAnirudh Venkataramanan struct ice_tx_desc *eop_desc = tx_buf->next_to_watch; 2202b245cb2SAnirudh Venkataramanan 2212b245cb2SAnirudh Venkataramanan /* if next_to_watch is not set then there is no work pending */ 2222b245cb2SAnirudh Venkataramanan if (!eop_desc) 2232b245cb2SAnirudh Venkataramanan break; 2242b245cb2SAnirudh Venkataramanan 2252b245cb2SAnirudh Venkataramanan smp_rmb(); /* prevent any other reads prior to eop_desc */ 2262b245cb2SAnirudh Venkataramanan 2272b245cb2SAnirudh Venkataramanan /* if the descriptor isn't done, no work yet to do */ 2282b245cb2SAnirudh Venkataramanan if (!(eop_desc->cmd_type_offset_bsz & 2292b245cb2SAnirudh Venkataramanan cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) 2302b245cb2SAnirudh Venkataramanan break; 2312b245cb2SAnirudh Venkataramanan 2322b245cb2SAnirudh Venkataramanan /* clear next_to_watch to prevent false hangs */ 2332b245cb2SAnirudh Venkataramanan tx_buf->next_to_watch = NULL; 2342b245cb2SAnirudh Venkataramanan 2352b245cb2SAnirudh Venkataramanan /* update the statistics for this packet */ 2362b245cb2SAnirudh Venkataramanan total_bytes += tx_buf->bytecount; 2372b245cb2SAnirudh Venkataramanan total_pkts += tx_buf->gso_segs; 2382b245cb2SAnirudh Venkataramanan 239efc2214bSMaciej Fijalkowski if (ice_ring_is_xdp(tx_ring)) 240efc2214bSMaciej Fijalkowski page_frag_free(tx_buf->raw_buf); 241efc2214bSMaciej Fijalkowski else 2422b245cb2SAnirudh Venkataramanan /* free the skb */ 2432b245cb2SAnirudh Venkataramanan napi_consume_skb(tx_buf->skb, napi_budget); 2442b245cb2SAnirudh Venkataramanan 2452b245cb2SAnirudh Venkataramanan /* unmap skb header data */ 2462b245cb2SAnirudh Venkataramanan dma_unmap_single(tx_ring->dev, 2472b245cb2SAnirudh Venkataramanan dma_unmap_addr(tx_buf, dma), 2482b245cb2SAnirudh Venkataramanan dma_unmap_len(tx_buf, len), 2492b245cb2SAnirudh Venkataramanan DMA_TO_DEVICE); 2502b245cb2SAnirudh Venkataramanan 2512b245cb2SAnirudh Venkataramanan /* clear tx_buf data */ 2522b245cb2SAnirudh Venkataramanan tx_buf->skb = NULL; 2532b245cb2SAnirudh Venkataramanan dma_unmap_len_set(tx_buf, len, 0); 2542b245cb2SAnirudh Venkataramanan 2552b245cb2SAnirudh Venkataramanan /* unmap remaining buffers */ 2562b245cb2SAnirudh Venkataramanan while (tx_desc != eop_desc) { 2572b245cb2SAnirudh Venkataramanan tx_buf++; 2582b245cb2SAnirudh Venkataramanan tx_desc++; 2592b245cb2SAnirudh Venkataramanan i++; 2602b245cb2SAnirudh Venkataramanan if (unlikely(!i)) { 2612b245cb2SAnirudh Venkataramanan i -= tx_ring->count; 2622b245cb2SAnirudh Venkataramanan tx_buf = tx_ring->tx_buf; 2632b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, 0); 2642b245cb2SAnirudh Venkataramanan } 2652b245cb2SAnirudh Venkataramanan 2662b245cb2SAnirudh Venkataramanan /* unmap any remaining paged data */ 2672b245cb2SAnirudh Venkataramanan if (dma_unmap_len(tx_buf, len)) { 2682b245cb2SAnirudh Venkataramanan dma_unmap_page(tx_ring->dev, 2692b245cb2SAnirudh Venkataramanan dma_unmap_addr(tx_buf, dma), 2702b245cb2SAnirudh Venkataramanan dma_unmap_len(tx_buf, len), 2712b245cb2SAnirudh Venkataramanan DMA_TO_DEVICE); 2722b245cb2SAnirudh Venkataramanan dma_unmap_len_set(tx_buf, len, 0); 2732b245cb2SAnirudh Venkataramanan } 2742b245cb2SAnirudh Venkataramanan } 2752b245cb2SAnirudh Venkataramanan 2762b245cb2SAnirudh Venkataramanan /* move us one more past the eop_desc for start of next pkt */ 2772b245cb2SAnirudh Venkataramanan tx_buf++; 2782b245cb2SAnirudh Venkataramanan tx_desc++; 2792b245cb2SAnirudh Venkataramanan i++; 2802b245cb2SAnirudh Venkataramanan if (unlikely(!i)) { 2812b245cb2SAnirudh Venkataramanan i -= tx_ring->count; 2822b245cb2SAnirudh Venkataramanan tx_buf = tx_ring->tx_buf; 2832b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, 0); 2842b245cb2SAnirudh Venkataramanan } 2852b245cb2SAnirudh Venkataramanan 2862b245cb2SAnirudh Venkataramanan prefetch(tx_desc); 2872b245cb2SAnirudh Venkataramanan 2882b245cb2SAnirudh Venkataramanan /* update budget accounting */ 2892b245cb2SAnirudh Venkataramanan budget--; 2902b245cb2SAnirudh Venkataramanan } while (likely(budget)); 2912b245cb2SAnirudh Venkataramanan 2922b245cb2SAnirudh Venkataramanan i += tx_ring->count; 2932b245cb2SAnirudh Venkataramanan tx_ring->next_to_clean = i; 2942d4238f5SKrzysztof Kazimierczak 2952d4238f5SKrzysztof Kazimierczak ice_update_tx_ring_stats(tx_ring, total_pkts, total_bytes); 2962b245cb2SAnirudh Venkataramanan 297efc2214bSMaciej Fijalkowski if (ice_ring_is_xdp(tx_ring)) 298efc2214bSMaciej Fijalkowski return !!budget; 299efc2214bSMaciej Fijalkowski 3002b245cb2SAnirudh Venkataramanan netdev_tx_completed_queue(txring_txq(tx_ring), total_pkts, 3012b245cb2SAnirudh Venkataramanan total_bytes); 3022b245cb2SAnirudh Venkataramanan 3032b245cb2SAnirudh Venkataramanan #define TX_WAKE_THRESHOLD ((s16)(DESC_NEEDED * 2)) 3042b245cb2SAnirudh Venkataramanan if (unlikely(total_pkts && netif_carrier_ok(tx_ring->netdev) && 3052b245cb2SAnirudh Venkataramanan (ICE_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) { 3062b245cb2SAnirudh Venkataramanan /* Make sure that anybody stopping the queue after this 3072b245cb2SAnirudh Venkataramanan * sees the new next_to_clean. 3082b245cb2SAnirudh Venkataramanan */ 3092b245cb2SAnirudh Venkataramanan smp_mb(); 3102b245cb2SAnirudh Venkataramanan if (__netif_subqueue_stopped(tx_ring->netdev, 3112b245cb2SAnirudh Venkataramanan tx_ring->q_index) && 312e97fb1aeSAnirudh Venkataramanan !test_bit(ICE_VSI_DOWN, vsi->state)) { 3132b245cb2SAnirudh Venkataramanan netif_wake_subqueue(tx_ring->netdev, 3142b245cb2SAnirudh Venkataramanan tx_ring->q_index); 3152b245cb2SAnirudh Venkataramanan ++tx_ring->tx_stats.restart_q; 3162b245cb2SAnirudh Venkataramanan } 3172b245cb2SAnirudh Venkataramanan } 3182b245cb2SAnirudh Venkataramanan 3192b245cb2SAnirudh Venkataramanan return !!budget; 3202b245cb2SAnirudh Venkataramanan } 3212b245cb2SAnirudh Venkataramanan 3222b245cb2SAnirudh Venkataramanan /** 323cdedef59SAnirudh Venkataramanan * ice_setup_tx_ring - Allocate the Tx descriptors 324d337f2afSAnirudh Venkataramanan * @tx_ring: the Tx ring to set up 325cdedef59SAnirudh Venkataramanan * 326cdedef59SAnirudh Venkataramanan * Return 0 on success, negative on error 327cdedef59SAnirudh Venkataramanan */ 328cdedef59SAnirudh Venkataramanan int ice_setup_tx_ring(struct ice_ring *tx_ring) 329cdedef59SAnirudh Venkataramanan { 330cdedef59SAnirudh Venkataramanan struct device *dev = tx_ring->dev; 331cdedef59SAnirudh Venkataramanan 332cdedef59SAnirudh Venkataramanan if (!dev) 333cdedef59SAnirudh Venkataramanan return -ENOMEM; 334cdedef59SAnirudh Venkataramanan 335cdedef59SAnirudh Venkataramanan /* warn if we are about to overwrite the pointer */ 336cdedef59SAnirudh Venkataramanan WARN_ON(tx_ring->tx_buf); 337c6dfd690SBruce Allan tx_ring->tx_buf = 338c6dfd690SBruce Allan devm_kzalloc(dev, sizeof(*tx_ring->tx_buf) * tx_ring->count, 339c6dfd690SBruce Allan GFP_KERNEL); 340cdedef59SAnirudh Venkataramanan if (!tx_ring->tx_buf) 341cdedef59SAnirudh Venkataramanan return -ENOMEM; 342cdedef59SAnirudh Venkataramanan 343ad71b256SBrett Creeley /* round up to nearest page */ 344c6dfd690SBruce Allan tx_ring->size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc), 345ad71b256SBrett Creeley PAGE_SIZE); 346cdedef59SAnirudh Venkataramanan tx_ring->desc = dmam_alloc_coherent(dev, tx_ring->size, &tx_ring->dma, 347cdedef59SAnirudh Venkataramanan GFP_KERNEL); 348cdedef59SAnirudh Venkataramanan if (!tx_ring->desc) { 349cdedef59SAnirudh Venkataramanan dev_err(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n", 350cdedef59SAnirudh Venkataramanan tx_ring->size); 351cdedef59SAnirudh Venkataramanan goto err; 352cdedef59SAnirudh Venkataramanan } 353cdedef59SAnirudh Venkataramanan 354cdedef59SAnirudh Venkataramanan tx_ring->next_to_use = 0; 355cdedef59SAnirudh Venkataramanan tx_ring->next_to_clean = 0; 356b3969fd7SSudheer Mogilappagari tx_ring->tx_stats.prev_pkt = -1; 357cdedef59SAnirudh Venkataramanan return 0; 358cdedef59SAnirudh Venkataramanan 359cdedef59SAnirudh Venkataramanan err: 360cdedef59SAnirudh Venkataramanan devm_kfree(dev, tx_ring->tx_buf); 361cdedef59SAnirudh Venkataramanan tx_ring->tx_buf = NULL; 362cdedef59SAnirudh Venkataramanan return -ENOMEM; 363cdedef59SAnirudh Venkataramanan } 364cdedef59SAnirudh Venkataramanan 365cdedef59SAnirudh Venkataramanan /** 366cdedef59SAnirudh Venkataramanan * ice_clean_rx_ring - Free Rx buffers 367cdedef59SAnirudh Venkataramanan * @rx_ring: ring to be cleaned 368cdedef59SAnirudh Venkataramanan */ 369cdedef59SAnirudh Venkataramanan void ice_clean_rx_ring(struct ice_ring *rx_ring) 370cdedef59SAnirudh Venkataramanan { 371cdedef59SAnirudh Venkataramanan struct device *dev = rx_ring->dev; 372cdedef59SAnirudh Venkataramanan u16 i; 373cdedef59SAnirudh Venkataramanan 374cdedef59SAnirudh Venkataramanan /* ring already cleared, nothing to do */ 375cdedef59SAnirudh Venkataramanan if (!rx_ring->rx_buf) 376cdedef59SAnirudh Venkataramanan return; 377cdedef59SAnirudh Venkataramanan 37829b82f2aSMaciej Fijalkowski if (rx_ring->skb) { 37929b82f2aSMaciej Fijalkowski dev_kfree_skb(rx_ring->skb); 38029b82f2aSMaciej Fijalkowski rx_ring->skb = NULL; 38129b82f2aSMaciej Fijalkowski } 38229b82f2aSMaciej Fijalkowski 3831742b3d5SMagnus Karlsson if (rx_ring->xsk_pool) { 3842d4238f5SKrzysztof Kazimierczak ice_xsk_clean_rx_ring(rx_ring); 3852d4238f5SKrzysztof Kazimierczak goto rx_skip_free; 3862d4238f5SKrzysztof Kazimierczak } 3872d4238f5SKrzysztof Kazimierczak 388cdedef59SAnirudh Venkataramanan /* Free all the Rx ring sk_buffs */ 389cdedef59SAnirudh Venkataramanan for (i = 0; i < rx_ring->count; i++) { 390cdedef59SAnirudh Venkataramanan struct ice_rx_buf *rx_buf = &rx_ring->rx_buf[i]; 391cdedef59SAnirudh Venkataramanan 392cdedef59SAnirudh Venkataramanan if (!rx_buf->page) 393cdedef59SAnirudh Venkataramanan continue; 394cdedef59SAnirudh Venkataramanan 395a65f71feSMaciej Fijalkowski /* Invalidate cache lines that may have been written to by 396a65f71feSMaciej Fijalkowski * device so that we avoid corrupting memory. 397a65f71feSMaciej Fijalkowski */ 398a65f71feSMaciej Fijalkowski dma_sync_single_range_for_cpu(dev, rx_buf->dma, 399a65f71feSMaciej Fijalkowski rx_buf->page_offset, 4007237f5b0SMaciej Fijalkowski rx_ring->rx_buf_len, 4017237f5b0SMaciej Fijalkowski DMA_FROM_DEVICE); 402a65f71feSMaciej Fijalkowski 403a65f71feSMaciej Fijalkowski /* free resources associated with mapping */ 4047237f5b0SMaciej Fijalkowski dma_unmap_page_attrs(dev, rx_buf->dma, ice_rx_pg_size(rx_ring), 405a65f71feSMaciej Fijalkowski DMA_FROM_DEVICE, ICE_RX_DMA_ATTR); 40603c66a13SMaciej Fijalkowski __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias); 407cdedef59SAnirudh Venkataramanan 408cdedef59SAnirudh Venkataramanan rx_buf->page = NULL; 409cdedef59SAnirudh Venkataramanan rx_buf->page_offset = 0; 410cdedef59SAnirudh Venkataramanan } 411cdedef59SAnirudh Venkataramanan 4122d4238f5SKrzysztof Kazimierczak rx_skip_free: 413c6dfd690SBruce Allan memset(rx_ring->rx_buf, 0, sizeof(*rx_ring->rx_buf) * rx_ring->count); 414cdedef59SAnirudh Venkataramanan 415cdedef59SAnirudh Venkataramanan /* Zero out the descriptor ring */ 416cdedef59SAnirudh Venkataramanan memset(rx_ring->desc, 0, rx_ring->size); 417cdedef59SAnirudh Venkataramanan 418cdedef59SAnirudh Venkataramanan rx_ring->next_to_alloc = 0; 419cdedef59SAnirudh Venkataramanan rx_ring->next_to_clean = 0; 420cdedef59SAnirudh Venkataramanan rx_ring->next_to_use = 0; 421cdedef59SAnirudh Venkataramanan } 422cdedef59SAnirudh Venkataramanan 423cdedef59SAnirudh Venkataramanan /** 424cdedef59SAnirudh Venkataramanan * ice_free_rx_ring - Free Rx resources 425cdedef59SAnirudh Venkataramanan * @rx_ring: ring to clean the resources from 426cdedef59SAnirudh Venkataramanan * 427cdedef59SAnirudh Venkataramanan * Free all receive software resources 428cdedef59SAnirudh Venkataramanan */ 429cdedef59SAnirudh Venkataramanan void ice_free_rx_ring(struct ice_ring *rx_ring) 430cdedef59SAnirudh Venkataramanan { 431cdedef59SAnirudh Venkataramanan ice_clean_rx_ring(rx_ring); 432efc2214bSMaciej Fijalkowski if (rx_ring->vsi->type == ICE_VSI_PF) 433efc2214bSMaciej Fijalkowski if (xdp_rxq_info_is_reg(&rx_ring->xdp_rxq)) 434efc2214bSMaciej Fijalkowski xdp_rxq_info_unreg(&rx_ring->xdp_rxq); 435efc2214bSMaciej Fijalkowski rx_ring->xdp_prog = NULL; 436cdedef59SAnirudh Venkataramanan devm_kfree(rx_ring->dev, rx_ring->rx_buf); 437cdedef59SAnirudh Venkataramanan rx_ring->rx_buf = NULL; 438cdedef59SAnirudh Venkataramanan 439cdedef59SAnirudh Venkataramanan if (rx_ring->desc) { 440cdedef59SAnirudh Venkataramanan dmam_free_coherent(rx_ring->dev, rx_ring->size, 441cdedef59SAnirudh Venkataramanan rx_ring->desc, rx_ring->dma); 442cdedef59SAnirudh Venkataramanan rx_ring->desc = NULL; 443cdedef59SAnirudh Venkataramanan } 444cdedef59SAnirudh Venkataramanan } 445cdedef59SAnirudh Venkataramanan 446cdedef59SAnirudh Venkataramanan /** 447cdedef59SAnirudh Venkataramanan * ice_setup_rx_ring - Allocate the Rx descriptors 448d337f2afSAnirudh Venkataramanan * @rx_ring: the Rx ring to set up 449cdedef59SAnirudh Venkataramanan * 450cdedef59SAnirudh Venkataramanan * Return 0 on success, negative on error 451cdedef59SAnirudh Venkataramanan */ 452cdedef59SAnirudh Venkataramanan int ice_setup_rx_ring(struct ice_ring *rx_ring) 453cdedef59SAnirudh Venkataramanan { 454cdedef59SAnirudh Venkataramanan struct device *dev = rx_ring->dev; 455cdedef59SAnirudh Venkataramanan 456cdedef59SAnirudh Venkataramanan if (!dev) 457cdedef59SAnirudh Venkataramanan return -ENOMEM; 458cdedef59SAnirudh Venkataramanan 459cdedef59SAnirudh Venkataramanan /* warn if we are about to overwrite the pointer */ 460cdedef59SAnirudh Venkataramanan WARN_ON(rx_ring->rx_buf); 461c6dfd690SBruce Allan rx_ring->rx_buf = 462c6dfd690SBruce Allan devm_kzalloc(dev, sizeof(*rx_ring->rx_buf) * rx_ring->count, 463c6dfd690SBruce Allan GFP_KERNEL); 464cdedef59SAnirudh Venkataramanan if (!rx_ring->rx_buf) 465cdedef59SAnirudh Venkataramanan return -ENOMEM; 466cdedef59SAnirudh Venkataramanan 467ad71b256SBrett Creeley /* round up to nearest page */ 468ad71b256SBrett Creeley rx_ring->size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc), 469ad71b256SBrett Creeley PAGE_SIZE); 470cdedef59SAnirudh Venkataramanan rx_ring->desc = dmam_alloc_coherent(dev, rx_ring->size, &rx_ring->dma, 471cdedef59SAnirudh Venkataramanan GFP_KERNEL); 472cdedef59SAnirudh Venkataramanan if (!rx_ring->desc) { 473cdedef59SAnirudh Venkataramanan dev_err(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n", 474cdedef59SAnirudh Venkataramanan rx_ring->size); 475cdedef59SAnirudh Venkataramanan goto err; 476cdedef59SAnirudh Venkataramanan } 477cdedef59SAnirudh Venkataramanan 478cdedef59SAnirudh Venkataramanan rx_ring->next_to_use = 0; 479cdedef59SAnirudh Venkataramanan rx_ring->next_to_clean = 0; 480efc2214bSMaciej Fijalkowski 481efc2214bSMaciej Fijalkowski if (ice_is_xdp_ena_vsi(rx_ring->vsi)) 482efc2214bSMaciej Fijalkowski WRITE_ONCE(rx_ring->xdp_prog, rx_ring->vsi->xdp_prog); 483efc2214bSMaciej Fijalkowski 484efc2214bSMaciej Fijalkowski if (rx_ring->vsi->type == ICE_VSI_PF && 485efc2214bSMaciej Fijalkowski !xdp_rxq_info_is_reg(&rx_ring->xdp_rxq)) 486efc2214bSMaciej Fijalkowski if (xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev, 487b02e5a0eSBjörn Töpel rx_ring->q_index, rx_ring->q_vector->napi.napi_id)) 488efc2214bSMaciej Fijalkowski goto err; 489cdedef59SAnirudh Venkataramanan return 0; 490cdedef59SAnirudh Venkataramanan 491cdedef59SAnirudh Venkataramanan err: 492cdedef59SAnirudh Venkataramanan devm_kfree(dev, rx_ring->rx_buf); 493cdedef59SAnirudh Venkataramanan rx_ring->rx_buf = NULL; 494cdedef59SAnirudh Venkataramanan return -ENOMEM; 495cdedef59SAnirudh Venkataramanan } 496cdedef59SAnirudh Venkataramanan 4976221595fSTony Nguyen static unsigned int 4986221595fSTony Nguyen ice_rx_frame_truesize(struct ice_ring *rx_ring, unsigned int __maybe_unused size) 499d4ecdbf7SJesper Dangaard Brouer { 500d4ecdbf7SJesper Dangaard Brouer unsigned int truesize; 501d4ecdbf7SJesper Dangaard Brouer 502d4ecdbf7SJesper Dangaard Brouer #if (PAGE_SIZE < 8192) 503d4ecdbf7SJesper Dangaard Brouer truesize = ice_rx_pg_size(rx_ring) / 2; /* Must be power-of-2 */ 504d4ecdbf7SJesper Dangaard Brouer #else 505f1b1f409SMaciej Fijalkowski truesize = rx_ring->rx_offset ? 506f1b1f409SMaciej Fijalkowski SKB_DATA_ALIGN(rx_ring->rx_offset + size) + 507d4ecdbf7SJesper Dangaard Brouer SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) : 508d4ecdbf7SJesper Dangaard Brouer SKB_DATA_ALIGN(size); 509d4ecdbf7SJesper Dangaard Brouer #endif 510d4ecdbf7SJesper Dangaard Brouer return truesize; 511d4ecdbf7SJesper Dangaard Brouer } 512d4ecdbf7SJesper Dangaard Brouer 513efc2214bSMaciej Fijalkowski /** 514efc2214bSMaciej Fijalkowski * ice_run_xdp - Executes an XDP program on initialized xdp_buff 515efc2214bSMaciej Fijalkowski * @rx_ring: Rx ring 516efc2214bSMaciej Fijalkowski * @xdp: xdp_buff used as input to the XDP program 517efc2214bSMaciej Fijalkowski * @xdp_prog: XDP program to run 518efc2214bSMaciej Fijalkowski * 519efc2214bSMaciej Fijalkowski * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR} 520efc2214bSMaciej Fijalkowski */ 521efc2214bSMaciej Fijalkowski static int 522efc2214bSMaciej Fijalkowski ice_run_xdp(struct ice_ring *rx_ring, struct xdp_buff *xdp, 523efc2214bSMaciej Fijalkowski struct bpf_prog *xdp_prog) 524efc2214bSMaciej Fijalkowski { 525efc2214bSMaciej Fijalkowski struct ice_ring *xdp_ring; 52659c97d1bSMaciej Fijalkowski int err; 527efc2214bSMaciej Fijalkowski u32 act; 528efc2214bSMaciej Fijalkowski 529efc2214bSMaciej Fijalkowski act = bpf_prog_run_xdp(xdp_prog, xdp); 530efc2214bSMaciej Fijalkowski switch (act) { 531efc2214bSMaciej Fijalkowski case XDP_PASS: 53259c97d1bSMaciej Fijalkowski return ICE_XDP_PASS; 533efc2214bSMaciej Fijalkowski case XDP_TX: 534efc2214bSMaciej Fijalkowski xdp_ring = rx_ring->vsi->xdp_rings[smp_processor_id()]; 53559c97d1bSMaciej Fijalkowski return ice_xmit_xdp_buff(xdp, xdp_ring); 536efc2214bSMaciej Fijalkowski case XDP_REDIRECT: 537efc2214bSMaciej Fijalkowski err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog); 53859c97d1bSMaciej Fijalkowski return !err ? ICE_XDP_REDIR : ICE_XDP_CONSUMED; 539efc2214bSMaciej Fijalkowski default: 540efc2214bSMaciej Fijalkowski bpf_warn_invalid_xdp_action(act); 5414e83fc93SBruce Allan fallthrough; 542efc2214bSMaciej Fijalkowski case XDP_ABORTED: 543efc2214bSMaciej Fijalkowski trace_xdp_exception(rx_ring->netdev, xdp_prog, act); 5444e83fc93SBruce Allan fallthrough; 545efc2214bSMaciej Fijalkowski case XDP_DROP: 54659c97d1bSMaciej Fijalkowski return ICE_XDP_CONSUMED; 547efc2214bSMaciej Fijalkowski } 548efc2214bSMaciej Fijalkowski } 549efc2214bSMaciej Fijalkowski 550efc2214bSMaciej Fijalkowski /** 551efc2214bSMaciej Fijalkowski * ice_xdp_xmit - submit packets to XDP ring for transmission 552efc2214bSMaciej Fijalkowski * @dev: netdev 553efc2214bSMaciej Fijalkowski * @n: number of XDP frames to be transmitted 554efc2214bSMaciej Fijalkowski * @frames: XDP frames to be transmitted 555efc2214bSMaciej Fijalkowski * @flags: transmit flags 556efc2214bSMaciej Fijalkowski * 557fdc13979SLorenzo Bianconi * Returns number of frames successfully sent. Failed frames 558fdc13979SLorenzo Bianconi * will be free'ed by XDP core. 559efc2214bSMaciej Fijalkowski * For error cases, a negative errno code is returned and no-frames 560efc2214bSMaciej Fijalkowski * are transmitted (caller must handle freeing frames). 561efc2214bSMaciej Fijalkowski */ 562efc2214bSMaciej Fijalkowski int 563efc2214bSMaciej Fijalkowski ice_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames, 564efc2214bSMaciej Fijalkowski u32 flags) 565efc2214bSMaciej Fijalkowski { 566efc2214bSMaciej Fijalkowski struct ice_netdev_priv *np = netdev_priv(dev); 567efc2214bSMaciej Fijalkowski unsigned int queue_index = smp_processor_id(); 568efc2214bSMaciej Fijalkowski struct ice_vsi *vsi = np->vsi; 569efc2214bSMaciej Fijalkowski struct ice_ring *xdp_ring; 570fdc13979SLorenzo Bianconi int nxmit = 0, i; 571efc2214bSMaciej Fijalkowski 572e97fb1aeSAnirudh Venkataramanan if (test_bit(ICE_VSI_DOWN, vsi->state)) 573efc2214bSMaciej Fijalkowski return -ENETDOWN; 574efc2214bSMaciej Fijalkowski 575efc2214bSMaciej Fijalkowski if (!ice_is_xdp_ena_vsi(vsi) || queue_index >= vsi->num_xdp_txq) 576efc2214bSMaciej Fijalkowski return -ENXIO; 577efc2214bSMaciej Fijalkowski 578efc2214bSMaciej Fijalkowski if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) 579efc2214bSMaciej Fijalkowski return -EINVAL; 580efc2214bSMaciej Fijalkowski 581efc2214bSMaciej Fijalkowski xdp_ring = vsi->xdp_rings[queue_index]; 582efc2214bSMaciej Fijalkowski for (i = 0; i < n; i++) { 583efc2214bSMaciej Fijalkowski struct xdp_frame *xdpf = frames[i]; 584efc2214bSMaciej Fijalkowski int err; 585efc2214bSMaciej Fijalkowski 586efc2214bSMaciej Fijalkowski err = ice_xmit_xdp_ring(xdpf->data, xdpf->len, xdp_ring); 587fdc13979SLorenzo Bianconi if (err != ICE_XDP_TX) 588fdc13979SLorenzo Bianconi break; 589fdc13979SLorenzo Bianconi nxmit++; 590efc2214bSMaciej Fijalkowski } 591efc2214bSMaciej Fijalkowski 592efc2214bSMaciej Fijalkowski if (unlikely(flags & XDP_XMIT_FLUSH)) 593efc2214bSMaciej Fijalkowski ice_xdp_ring_update_tail(xdp_ring); 594efc2214bSMaciej Fijalkowski 595fdc13979SLorenzo Bianconi return nxmit; 596efc2214bSMaciej Fijalkowski } 597efc2214bSMaciej Fijalkowski 598efc2214bSMaciej Fijalkowski /** 599cdedef59SAnirudh Venkataramanan * ice_alloc_mapped_page - recycle or make a new page 600cdedef59SAnirudh Venkataramanan * @rx_ring: ring to use 601cdedef59SAnirudh Venkataramanan * @bi: rx_buf struct to modify 602cdedef59SAnirudh Venkataramanan * 603cdedef59SAnirudh Venkataramanan * Returns true if the page was successfully allocated or 604cdedef59SAnirudh Venkataramanan * reused. 605cdedef59SAnirudh Venkataramanan */ 606c8b7abddSBruce Allan static bool 607c8b7abddSBruce Allan ice_alloc_mapped_page(struct ice_ring *rx_ring, struct ice_rx_buf *bi) 608cdedef59SAnirudh Venkataramanan { 609cdedef59SAnirudh Venkataramanan struct page *page = bi->page; 610cdedef59SAnirudh Venkataramanan dma_addr_t dma; 611cdedef59SAnirudh Venkataramanan 612cdedef59SAnirudh Venkataramanan /* since we are recycling buffers we should seldom need to alloc */ 6137dbc63f0STony Nguyen if (likely(page)) 614cdedef59SAnirudh Venkataramanan return true; 615cdedef59SAnirudh Venkataramanan 616cdedef59SAnirudh Venkataramanan /* alloc new page for storage */ 6177237f5b0SMaciej Fijalkowski page = dev_alloc_pages(ice_rx_pg_order(rx_ring)); 6182b245cb2SAnirudh Venkataramanan if (unlikely(!page)) { 6192b245cb2SAnirudh Venkataramanan rx_ring->rx_stats.alloc_page_failed++; 620cdedef59SAnirudh Venkataramanan return false; 6212b245cb2SAnirudh Venkataramanan } 622cdedef59SAnirudh Venkataramanan 623cdedef59SAnirudh Venkataramanan /* map page for use */ 6247237f5b0SMaciej Fijalkowski dma = dma_map_page_attrs(rx_ring->dev, page, 0, ice_rx_pg_size(rx_ring), 625a65f71feSMaciej Fijalkowski DMA_FROM_DEVICE, ICE_RX_DMA_ATTR); 626cdedef59SAnirudh Venkataramanan 627cdedef59SAnirudh Venkataramanan /* if mapping failed free memory back to system since 628cdedef59SAnirudh Venkataramanan * there isn't much point in holding memory we can't use 629cdedef59SAnirudh Venkataramanan */ 630cdedef59SAnirudh Venkataramanan if (dma_mapping_error(rx_ring->dev, dma)) { 6317237f5b0SMaciej Fijalkowski __free_pages(page, ice_rx_pg_order(rx_ring)); 6322b245cb2SAnirudh Venkataramanan rx_ring->rx_stats.alloc_page_failed++; 633cdedef59SAnirudh Venkataramanan return false; 634cdedef59SAnirudh Venkataramanan } 635cdedef59SAnirudh Venkataramanan 636cdedef59SAnirudh Venkataramanan bi->dma = dma; 637cdedef59SAnirudh Venkataramanan bi->page = page; 638f1b1f409SMaciej Fijalkowski bi->page_offset = rx_ring->rx_offset; 63903c66a13SMaciej Fijalkowski page_ref_add(page, USHRT_MAX - 1); 64003c66a13SMaciej Fijalkowski bi->pagecnt_bias = USHRT_MAX; 641cdedef59SAnirudh Venkataramanan 642cdedef59SAnirudh Venkataramanan return true; 643cdedef59SAnirudh Venkataramanan } 644cdedef59SAnirudh Venkataramanan 645cdedef59SAnirudh Venkataramanan /** 646cdedef59SAnirudh Venkataramanan * ice_alloc_rx_bufs - Replace used receive buffers 647cdedef59SAnirudh Venkataramanan * @rx_ring: ring to place buffers on 648cdedef59SAnirudh Venkataramanan * @cleaned_count: number of buffers to replace 649cdedef59SAnirudh Venkataramanan * 650cb7db356SBrett Creeley * Returns false if all allocations were successful, true if any fail. Returning 651cb7db356SBrett Creeley * true signals to the caller that we didn't replace cleaned_count buffers and 652cb7db356SBrett Creeley * there is more work to do. 653cb7db356SBrett Creeley * 654cb7db356SBrett Creeley * First, try to clean "cleaned_count" Rx buffers. Then refill the cleaned Rx 655cb7db356SBrett Creeley * buffers. Then bump tail at most one time. Grouping like this lets us avoid 656cb7db356SBrett Creeley * multiple tail writes per call. 657cdedef59SAnirudh Venkataramanan */ 658cdedef59SAnirudh Venkataramanan bool ice_alloc_rx_bufs(struct ice_ring *rx_ring, u16 cleaned_count) 659cdedef59SAnirudh Venkataramanan { 660cdedef59SAnirudh Venkataramanan union ice_32b_rx_flex_desc *rx_desc; 661cdedef59SAnirudh Venkataramanan u16 ntu = rx_ring->next_to_use; 662cdedef59SAnirudh Venkataramanan struct ice_rx_buf *bi; 663cdedef59SAnirudh Venkataramanan 664cdedef59SAnirudh Venkataramanan /* do nothing if no valid netdev defined */ 665148beb61SHenry Tieman if ((!rx_ring->netdev && rx_ring->vsi->type != ICE_VSI_CTRL) || 666148beb61SHenry Tieman !cleaned_count) 667cdedef59SAnirudh Venkataramanan return false; 668cdedef59SAnirudh Venkataramanan 669f9867df6SAnirudh Venkataramanan /* get the Rx descriptor and buffer based on next_to_use */ 670cdedef59SAnirudh Venkataramanan rx_desc = ICE_RX_DESC(rx_ring, ntu); 671cdedef59SAnirudh Venkataramanan bi = &rx_ring->rx_buf[ntu]; 672cdedef59SAnirudh Venkataramanan 673cdedef59SAnirudh Venkataramanan do { 674a1e99685SBrett Creeley /* if we fail here, we have work remaining */ 675cdedef59SAnirudh Venkataramanan if (!ice_alloc_mapped_page(rx_ring, bi)) 676a1e99685SBrett Creeley break; 677cdedef59SAnirudh Venkataramanan 678a65f71feSMaciej Fijalkowski /* sync the buffer for use by the device */ 679a65f71feSMaciej Fijalkowski dma_sync_single_range_for_device(rx_ring->dev, bi->dma, 680a65f71feSMaciej Fijalkowski bi->page_offset, 6817237f5b0SMaciej Fijalkowski rx_ring->rx_buf_len, 682a65f71feSMaciej Fijalkowski DMA_FROM_DEVICE); 683a65f71feSMaciej Fijalkowski 684cdedef59SAnirudh Venkataramanan /* Refresh the desc even if buffer_addrs didn't change 685cdedef59SAnirudh Venkataramanan * because each write-back erases this info. 686cdedef59SAnirudh Venkataramanan */ 687cdedef59SAnirudh Venkataramanan rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset); 688cdedef59SAnirudh Venkataramanan 689cdedef59SAnirudh Venkataramanan rx_desc++; 690cdedef59SAnirudh Venkataramanan bi++; 691cdedef59SAnirudh Venkataramanan ntu++; 692cdedef59SAnirudh Venkataramanan if (unlikely(ntu == rx_ring->count)) { 693cdedef59SAnirudh Venkataramanan rx_desc = ICE_RX_DESC(rx_ring, 0); 694cdedef59SAnirudh Venkataramanan bi = rx_ring->rx_buf; 695cdedef59SAnirudh Venkataramanan ntu = 0; 696cdedef59SAnirudh Venkataramanan } 697cdedef59SAnirudh Venkataramanan 698cdedef59SAnirudh Venkataramanan /* clear the status bits for the next_to_use descriptor */ 699cdedef59SAnirudh Venkataramanan rx_desc->wb.status_error0 = 0; 700cdedef59SAnirudh Venkataramanan 701cdedef59SAnirudh Venkataramanan cleaned_count--; 702cdedef59SAnirudh Venkataramanan } while (cleaned_count); 703cdedef59SAnirudh Venkataramanan 704cdedef59SAnirudh Venkataramanan if (rx_ring->next_to_use != ntu) 705cdedef59SAnirudh Venkataramanan ice_release_rx_desc(rx_ring, ntu); 706cdedef59SAnirudh Venkataramanan 707a1e99685SBrett Creeley return !!cleaned_count; 708cdedef59SAnirudh Venkataramanan } 7092b245cb2SAnirudh Venkataramanan 7102b245cb2SAnirudh Venkataramanan /** 7111d032bc7SMaciej Fijalkowski * ice_rx_buf_adjust_pg_offset - Prepare Rx buffer for reuse 7121d032bc7SMaciej Fijalkowski * @rx_buf: Rx buffer to adjust 7131d032bc7SMaciej Fijalkowski * @size: Size of adjustment 7142b245cb2SAnirudh Venkataramanan * 7151d032bc7SMaciej Fijalkowski * Update the offset within page so that Rx buf will be ready to be reused. 7161d032bc7SMaciej Fijalkowski * For systems with PAGE_SIZE < 8192 this function will flip the page offset 7171d032bc7SMaciej Fijalkowski * so the second half of page assigned to Rx buffer will be used, otherwise 7184ee656bbSTony Nguyen * the offset is moved by "size" bytes 7192b245cb2SAnirudh Venkataramanan */ 7201d032bc7SMaciej Fijalkowski static void 7211d032bc7SMaciej Fijalkowski ice_rx_buf_adjust_pg_offset(struct ice_rx_buf *rx_buf, unsigned int size) 7222b245cb2SAnirudh Venkataramanan { 7232b245cb2SAnirudh Venkataramanan #if (PAGE_SIZE < 8192) 7241d032bc7SMaciej Fijalkowski /* flip page offset to other buffer */ 7251d032bc7SMaciej Fijalkowski rx_buf->page_offset ^= size; 7262b245cb2SAnirudh Venkataramanan #else 7271d032bc7SMaciej Fijalkowski /* move offset up to the next cache line */ 7281d032bc7SMaciej Fijalkowski rx_buf->page_offset += size; 7291d032bc7SMaciej Fijalkowski #endif 7302b245cb2SAnirudh Venkataramanan } 7312b245cb2SAnirudh Venkataramanan 7321d032bc7SMaciej Fijalkowski /** 733bbb97808SMaciej Fijalkowski * ice_can_reuse_rx_page - Determine if page can be reused for another Rx 734bbb97808SMaciej Fijalkowski * @rx_buf: buffer containing the page 7351beb7830SBjörn Töpel * @rx_buf_pgcnt: rx_buf page refcount pre xdp_do_redirect() call 736bbb97808SMaciej Fijalkowski * 737bbb97808SMaciej Fijalkowski * If page is reusable, we have a green light for calling ice_reuse_rx_page, 738bbb97808SMaciej Fijalkowski * which will assign the current buffer to the buffer that next_to_alloc is 739bbb97808SMaciej Fijalkowski * pointing to; otherwise, the DMA mapping needs to be destroyed and 740bbb97808SMaciej Fijalkowski * page freed 741bbb97808SMaciej Fijalkowski */ 7421beb7830SBjörn Töpel static bool 7431beb7830SBjörn Töpel ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf, int rx_buf_pgcnt) 744bbb97808SMaciej Fijalkowski { 74503c66a13SMaciej Fijalkowski unsigned int pagecnt_bias = rx_buf->pagecnt_bias; 746bbb97808SMaciej Fijalkowski struct page *page = rx_buf->page; 7472b245cb2SAnirudh Venkataramanan 748a79afa78SAlexander Lobakin /* avoid re-using remote and pfmemalloc pages */ 749a79afa78SAlexander Lobakin if (!dev_page_is_reusable(page)) 7502b245cb2SAnirudh Venkataramanan return false; 7512b245cb2SAnirudh Venkataramanan 7522b245cb2SAnirudh Venkataramanan #if (PAGE_SIZE < 8192) 7532b245cb2SAnirudh Venkataramanan /* if we are only owner of page we can reuse it */ 7541beb7830SBjörn Töpel if (unlikely((rx_buf_pgcnt - pagecnt_bias) > 1)) 7552b245cb2SAnirudh Venkataramanan return false; 7562b245cb2SAnirudh Venkataramanan #else 7577237f5b0SMaciej Fijalkowski #define ICE_LAST_OFFSET \ 7587237f5b0SMaciej Fijalkowski (SKB_WITH_OVERHEAD(PAGE_SIZE) - ICE_RXBUF_2048) 7597237f5b0SMaciej Fijalkowski if (rx_buf->page_offset > ICE_LAST_OFFSET) 7602b245cb2SAnirudh Venkataramanan return false; 7612b245cb2SAnirudh Venkataramanan #endif /* PAGE_SIZE < 8192) */ 7622b245cb2SAnirudh Venkataramanan 76303c66a13SMaciej Fijalkowski /* If we have drained the page fragment pool we need to update 76403c66a13SMaciej Fijalkowski * the pagecnt_bias and page count so that we fully restock the 76503c66a13SMaciej Fijalkowski * number of references the driver holds. 7662b245cb2SAnirudh Venkataramanan */ 76703c66a13SMaciej Fijalkowski if (unlikely(pagecnt_bias == 1)) { 76803c66a13SMaciej Fijalkowski page_ref_add(page, USHRT_MAX - 1); 76903c66a13SMaciej Fijalkowski rx_buf->pagecnt_bias = USHRT_MAX; 77003c66a13SMaciej Fijalkowski } 7712b245cb2SAnirudh Venkataramanan 7722b245cb2SAnirudh Venkataramanan return true; 7732b245cb2SAnirudh Venkataramanan } 7742b245cb2SAnirudh Venkataramanan 7752b245cb2SAnirudh Venkataramanan /** 776712edbbbSMaciej Fijalkowski * ice_add_rx_frag - Add contents of Rx buffer to sk_buff as a frag 7777237f5b0SMaciej Fijalkowski * @rx_ring: Rx descriptor ring to transact packets on 7782b245cb2SAnirudh Venkataramanan * @rx_buf: buffer containing page to add 779712edbbbSMaciej Fijalkowski * @skb: sk_buff to place the data into 780712edbbbSMaciej Fijalkowski * @size: packet length from rx_desc 7812b245cb2SAnirudh Venkataramanan * 7822b245cb2SAnirudh Venkataramanan * This function will add the data contained in rx_buf->page to the skb. 783712edbbbSMaciej Fijalkowski * It will just attach the page as a frag to the skb. 784712edbbbSMaciej Fijalkowski * The function will then update the page offset. 7852b245cb2SAnirudh Venkataramanan */ 7861d032bc7SMaciej Fijalkowski static void 7877237f5b0SMaciej Fijalkowski ice_add_rx_frag(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf, 7887237f5b0SMaciej Fijalkowski struct sk_buff *skb, unsigned int size) 7892b245cb2SAnirudh Venkataramanan { 790712edbbbSMaciej Fijalkowski #if (PAGE_SIZE >= 8192) 791f1b1f409SMaciej Fijalkowski unsigned int truesize = SKB_DATA_ALIGN(size + rx_ring->rx_offset); 7922b245cb2SAnirudh Venkataramanan #else 7937237f5b0SMaciej Fijalkowski unsigned int truesize = ice_rx_pg_size(rx_ring) / 2; 794712edbbbSMaciej Fijalkowski #endif 7951857ca42SMaciej Fijalkowski 796ac6f733aSMitch Williams if (!size) 797ac6f733aSMitch Williams return; 798712edbbbSMaciej Fijalkowski skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buf->page, 799712edbbbSMaciej Fijalkowski rx_buf->page_offset, size, truesize); 8002b245cb2SAnirudh Venkataramanan 801712edbbbSMaciej Fijalkowski /* page is being used so we must update the page offset */ 8021d032bc7SMaciej Fijalkowski ice_rx_buf_adjust_pg_offset(rx_buf, truesize); 8032b245cb2SAnirudh Venkataramanan } 8042b245cb2SAnirudh Venkataramanan 8052b245cb2SAnirudh Venkataramanan /** 8062b245cb2SAnirudh Venkataramanan * ice_reuse_rx_page - page flip buffer and store it back on the ring 807d337f2afSAnirudh Venkataramanan * @rx_ring: Rx descriptor ring to store buffers on 8082b245cb2SAnirudh Venkataramanan * @old_buf: donor buffer to have page reused 8092b245cb2SAnirudh Venkataramanan * 8102b245cb2SAnirudh Venkataramanan * Synchronizes page for reuse by the adapter 8112b245cb2SAnirudh Venkataramanan */ 812c8b7abddSBruce Allan static void 813c8b7abddSBruce Allan ice_reuse_rx_page(struct ice_ring *rx_ring, struct ice_rx_buf *old_buf) 8142b245cb2SAnirudh Venkataramanan { 8152b245cb2SAnirudh Venkataramanan u16 nta = rx_ring->next_to_alloc; 8162b245cb2SAnirudh Venkataramanan struct ice_rx_buf *new_buf; 8172b245cb2SAnirudh Venkataramanan 8182b245cb2SAnirudh Venkataramanan new_buf = &rx_ring->rx_buf[nta]; 8192b245cb2SAnirudh Venkataramanan 8202b245cb2SAnirudh Venkataramanan /* update, and store next to alloc */ 8212b245cb2SAnirudh Venkataramanan nta++; 8222b245cb2SAnirudh Venkataramanan rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0; 8232b245cb2SAnirudh Venkataramanan 824712edbbbSMaciej Fijalkowski /* Transfer page from old buffer to new buffer. 825712edbbbSMaciej Fijalkowski * Move each member individually to avoid possible store 826712edbbbSMaciej Fijalkowski * forwarding stalls and unnecessary copy of skb. 827712edbbbSMaciej Fijalkowski */ 828712edbbbSMaciej Fijalkowski new_buf->dma = old_buf->dma; 829712edbbbSMaciej Fijalkowski new_buf->page = old_buf->page; 830712edbbbSMaciej Fijalkowski new_buf->page_offset = old_buf->page_offset; 831712edbbbSMaciej Fijalkowski new_buf->pagecnt_bias = old_buf->pagecnt_bias; 8322b245cb2SAnirudh Venkataramanan } 8332b245cb2SAnirudh Venkataramanan 8342b245cb2SAnirudh Venkataramanan /** 8356c869cb7SMaciej Fijalkowski * ice_get_rx_buf - Fetch Rx buffer and synchronize data for use 836d337f2afSAnirudh Venkataramanan * @rx_ring: Rx descriptor ring to transact packets on 8376c869cb7SMaciej Fijalkowski * @size: size of buffer to add to skb 8381beb7830SBjörn Töpel * @rx_buf_pgcnt: rx_buf page refcount 8392b245cb2SAnirudh Venkataramanan * 8406c869cb7SMaciej Fijalkowski * This function will pull an Rx buffer from the ring and synchronize it 8416c869cb7SMaciej Fijalkowski * for use by the CPU. 8422b245cb2SAnirudh Venkataramanan */ 8436c869cb7SMaciej Fijalkowski static struct ice_rx_buf * 84429b82f2aSMaciej Fijalkowski ice_get_rx_buf(struct ice_ring *rx_ring, const unsigned int size, 84529b82f2aSMaciej Fijalkowski int *rx_buf_pgcnt) 8462b245cb2SAnirudh Venkataramanan { 8472b245cb2SAnirudh Venkataramanan struct ice_rx_buf *rx_buf; 8482b245cb2SAnirudh Venkataramanan 8492b245cb2SAnirudh Venkataramanan rx_buf = &rx_ring->rx_buf[rx_ring->next_to_clean]; 8501beb7830SBjörn Töpel *rx_buf_pgcnt = 8511beb7830SBjörn Töpel #if (PAGE_SIZE < 8192) 8521beb7830SBjörn Töpel page_count(rx_buf->page); 8531beb7830SBjörn Töpel #else 8541beb7830SBjörn Töpel 0; 8551beb7830SBjörn Töpel #endif 8566c869cb7SMaciej Fijalkowski prefetchw(rx_buf->page); 8572b245cb2SAnirudh Venkataramanan 858ac6f733aSMitch Williams if (!size) 859ac6f733aSMitch Williams return rx_buf; 8606c869cb7SMaciej Fijalkowski /* we are reusing so sync this buffer for CPU use */ 8616c869cb7SMaciej Fijalkowski dma_sync_single_range_for_cpu(rx_ring->dev, rx_buf->dma, 8626c869cb7SMaciej Fijalkowski rx_buf->page_offset, size, 8636c869cb7SMaciej Fijalkowski DMA_FROM_DEVICE); 8642b245cb2SAnirudh Venkataramanan 86503c66a13SMaciej Fijalkowski /* We have pulled a buffer for use, so decrement pagecnt_bias */ 86603c66a13SMaciej Fijalkowski rx_buf->pagecnt_bias--; 86703c66a13SMaciej Fijalkowski 8686c869cb7SMaciej Fijalkowski return rx_buf; 8696c869cb7SMaciej Fijalkowski } 8706c869cb7SMaciej Fijalkowski 8716c869cb7SMaciej Fijalkowski /** 872aaf27254SMaciej Fijalkowski * ice_build_skb - Build skb around an existing buffer 873aaf27254SMaciej Fijalkowski * @rx_ring: Rx descriptor ring to transact packets on 874aaf27254SMaciej Fijalkowski * @rx_buf: Rx buffer to pull data from 875aaf27254SMaciej Fijalkowski * @xdp: xdp_buff pointing to the data 876aaf27254SMaciej Fijalkowski * 877aaf27254SMaciej Fijalkowski * This function builds an skb around an existing Rx buffer, taking care 878aaf27254SMaciej Fijalkowski * to set up the skb correctly and avoid any memcpy overhead. 879aaf27254SMaciej Fijalkowski */ 880aaf27254SMaciej Fijalkowski static struct sk_buff * 881aaf27254SMaciej Fijalkowski ice_build_skb(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf, 882aaf27254SMaciej Fijalkowski struct xdp_buff *xdp) 883aaf27254SMaciej Fijalkowski { 88488865fc4SKarol Kolacinski u8 metasize = xdp->data - xdp->data_meta; 885aaf27254SMaciej Fijalkowski #if (PAGE_SIZE < 8192) 886aaf27254SMaciej Fijalkowski unsigned int truesize = ice_rx_pg_size(rx_ring) / 2; 887aaf27254SMaciej Fijalkowski #else 888aaf27254SMaciej Fijalkowski unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + 889aaf27254SMaciej Fijalkowski SKB_DATA_ALIGN(xdp->data_end - 890aaf27254SMaciej Fijalkowski xdp->data_hard_start); 891aaf27254SMaciej Fijalkowski #endif 892aaf27254SMaciej Fijalkowski struct sk_buff *skb; 893aaf27254SMaciej Fijalkowski 894aaf27254SMaciej Fijalkowski /* Prefetch first cache line of first page. If xdp->data_meta 895aaf27254SMaciej Fijalkowski * is unused, this points exactly as xdp->data, otherwise we 896aaf27254SMaciej Fijalkowski * likely have a consumer accessing first few bytes of meta 897aaf27254SMaciej Fijalkowski * data, and then actual data. 898aaf27254SMaciej Fijalkowski */ 899f468f21bSTariq Toukan net_prefetch(xdp->data_meta); 900aaf27254SMaciej Fijalkowski /* build an skb around the page buffer */ 901aaf27254SMaciej Fijalkowski skb = build_skb(xdp->data_hard_start, truesize); 902aaf27254SMaciej Fijalkowski if (unlikely(!skb)) 903aaf27254SMaciej Fijalkowski return NULL; 904aaf27254SMaciej Fijalkowski 905aaf27254SMaciej Fijalkowski /* must to record Rx queue, otherwise OS features such as 906aaf27254SMaciej Fijalkowski * symmetric queue won't work 907aaf27254SMaciej Fijalkowski */ 908aaf27254SMaciej Fijalkowski skb_record_rx_queue(skb, rx_ring->q_index); 909aaf27254SMaciej Fijalkowski 910aaf27254SMaciej Fijalkowski /* update pointers within the skb to store the data */ 911aaf27254SMaciej Fijalkowski skb_reserve(skb, xdp->data - xdp->data_hard_start); 912aaf27254SMaciej Fijalkowski __skb_put(skb, xdp->data_end - xdp->data); 913aaf27254SMaciej Fijalkowski if (metasize) 914aaf27254SMaciej Fijalkowski skb_metadata_set(skb, metasize); 915aaf27254SMaciej Fijalkowski 916aaf27254SMaciej Fijalkowski /* buffer is used by skb, update page_offset */ 917aaf27254SMaciej Fijalkowski ice_rx_buf_adjust_pg_offset(rx_buf, truesize); 918aaf27254SMaciej Fijalkowski 919aaf27254SMaciej Fijalkowski return skb; 920aaf27254SMaciej Fijalkowski } 921aaf27254SMaciej Fijalkowski 922aaf27254SMaciej Fijalkowski /** 923712edbbbSMaciej Fijalkowski * ice_construct_skb - Allocate skb and populate it 9242b245cb2SAnirudh Venkataramanan * @rx_ring: Rx descriptor ring to transact packets on 9256c869cb7SMaciej Fijalkowski * @rx_buf: Rx buffer to pull data from 926efc2214bSMaciej Fijalkowski * @xdp: xdp_buff pointing to the data 9272b245cb2SAnirudh Venkataramanan * 928712edbbbSMaciej Fijalkowski * This function allocates an skb. It then populates it with the page 929712edbbbSMaciej Fijalkowski * data from the current receive descriptor, taking care to set up the 930712edbbbSMaciej Fijalkowski * skb correctly. 9312b245cb2SAnirudh Venkataramanan */ 932c8b7abddSBruce Allan static struct sk_buff * 933712edbbbSMaciej Fijalkowski ice_construct_skb(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf, 934efc2214bSMaciej Fijalkowski struct xdp_buff *xdp) 9352b245cb2SAnirudh Venkataramanan { 936efc2214bSMaciej Fijalkowski unsigned int size = xdp->data_end - xdp->data; 937712edbbbSMaciej Fijalkowski unsigned int headlen; 938712edbbbSMaciej Fijalkowski struct sk_buff *skb; 9392b245cb2SAnirudh Venkataramanan 9402b245cb2SAnirudh Venkataramanan /* prefetch first cache line of first page */ 941f468f21bSTariq Toukan net_prefetch(xdp->data); 9422b245cb2SAnirudh Venkataramanan 9432b245cb2SAnirudh Venkataramanan /* allocate a skb to store the frags */ 944712edbbbSMaciej Fijalkowski skb = __napi_alloc_skb(&rx_ring->q_vector->napi, ICE_RX_HDR_SIZE, 9452b245cb2SAnirudh Venkataramanan GFP_ATOMIC | __GFP_NOWARN); 946712edbbbSMaciej Fijalkowski if (unlikely(!skb)) 9472b245cb2SAnirudh Venkataramanan return NULL; 9482b245cb2SAnirudh Venkataramanan 9492b245cb2SAnirudh Venkataramanan skb_record_rx_queue(skb, rx_ring->q_index); 950712edbbbSMaciej Fijalkowski /* Determine available headroom for copy */ 951712edbbbSMaciej Fijalkowski headlen = size; 952712edbbbSMaciej Fijalkowski if (headlen > ICE_RX_HDR_SIZE) 953efc2214bSMaciej Fijalkowski headlen = eth_get_headlen(skb->dev, xdp->data, ICE_RX_HDR_SIZE); 9542b245cb2SAnirudh Venkataramanan 955712edbbbSMaciej Fijalkowski /* align pull length to size of long to optimize memcpy performance */ 956efc2214bSMaciej Fijalkowski memcpy(__skb_put(skb, headlen), xdp->data, ALIGN(headlen, 957efc2214bSMaciej Fijalkowski sizeof(long))); 958712edbbbSMaciej Fijalkowski 959712edbbbSMaciej Fijalkowski /* if we exhaust the linear part then add what is left as a frag */ 960712edbbbSMaciej Fijalkowski size -= headlen; 961712edbbbSMaciej Fijalkowski if (size) { 962712edbbbSMaciej Fijalkowski #if (PAGE_SIZE >= 8192) 963712edbbbSMaciej Fijalkowski unsigned int truesize = SKB_DATA_ALIGN(size); 964712edbbbSMaciej Fijalkowski #else 9657237f5b0SMaciej Fijalkowski unsigned int truesize = ice_rx_pg_size(rx_ring) / 2; 966712edbbbSMaciej Fijalkowski #endif 967712edbbbSMaciej Fijalkowski skb_add_rx_frag(skb, 0, rx_buf->page, 968712edbbbSMaciej Fijalkowski rx_buf->page_offset + headlen, size, truesize); 969712edbbbSMaciej Fijalkowski /* buffer is used by skb, update page_offset */ 970712edbbbSMaciej Fijalkowski ice_rx_buf_adjust_pg_offset(rx_buf, truesize); 9712b245cb2SAnirudh Venkataramanan } else { 972712edbbbSMaciej Fijalkowski /* buffer is unused, reset bias back to rx_buf; data was copied 973712edbbbSMaciej Fijalkowski * onto skb's linear part so there's no need for adjusting 974712edbbbSMaciej Fijalkowski * page offset and we can reuse this buffer as-is 975712edbbbSMaciej Fijalkowski */ 976712edbbbSMaciej Fijalkowski rx_buf->pagecnt_bias++; 9772b245cb2SAnirudh Venkataramanan } 9782b245cb2SAnirudh Venkataramanan 9792b245cb2SAnirudh Venkataramanan return skb; 9802b245cb2SAnirudh Venkataramanan } 9812b245cb2SAnirudh Venkataramanan 9822b245cb2SAnirudh Venkataramanan /** 9831d032bc7SMaciej Fijalkowski * ice_put_rx_buf - Clean up used buffer and either recycle or free 9841d032bc7SMaciej Fijalkowski * @rx_ring: Rx descriptor ring to transact packets on 9851d032bc7SMaciej Fijalkowski * @rx_buf: Rx buffer to pull data from 9861beb7830SBjörn Töpel * @rx_buf_pgcnt: Rx buffer page count pre xdp_do_redirect() 9872b245cb2SAnirudh Venkataramanan * 988efc2214bSMaciej Fijalkowski * This function will update next_to_clean and then clean up the contents 989efc2214bSMaciej Fijalkowski * of the rx_buf. It will either recycle the buffer or unmap it and free 990efc2214bSMaciej Fijalkowski * the associated resources. 9912b245cb2SAnirudh Venkataramanan */ 9921beb7830SBjörn Töpel static void 9931beb7830SBjörn Töpel ice_put_rx_buf(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf, 9941beb7830SBjörn Töpel int rx_buf_pgcnt) 9952b245cb2SAnirudh Venkataramanan { 99688865fc4SKarol Kolacinski u16 ntc = rx_ring->next_to_clean + 1; 997efc2214bSMaciej Fijalkowski 998efc2214bSMaciej Fijalkowski /* fetch, update, and store next to clean */ 999efc2214bSMaciej Fijalkowski ntc = (ntc < rx_ring->count) ? ntc : 0; 1000efc2214bSMaciej Fijalkowski rx_ring->next_to_clean = ntc; 1001efc2214bSMaciej Fijalkowski 1002ac6f733aSMitch Williams if (!rx_buf) 1003ac6f733aSMitch Williams return; 1004ac6f733aSMitch Williams 10051beb7830SBjörn Töpel if (ice_can_reuse_rx_page(rx_buf, rx_buf_pgcnt)) { 1006ac6f733aSMitch Williams /* hand second half of page back to the ring */ 10072b245cb2SAnirudh Venkataramanan ice_reuse_rx_page(rx_ring, rx_buf); 10082b245cb2SAnirudh Venkataramanan } else { 10092b245cb2SAnirudh Venkataramanan /* we are not reusing the buffer so unmap it */ 10107237f5b0SMaciej Fijalkowski dma_unmap_page_attrs(rx_ring->dev, rx_buf->dma, 10117237f5b0SMaciej Fijalkowski ice_rx_pg_size(rx_ring), DMA_FROM_DEVICE, 10127237f5b0SMaciej Fijalkowski ICE_RX_DMA_ATTR); 101303c66a13SMaciej Fijalkowski __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias); 10142b245cb2SAnirudh Venkataramanan } 10152b245cb2SAnirudh Venkataramanan 10162b245cb2SAnirudh Venkataramanan /* clear contents of buffer_info */ 10172b245cb2SAnirudh Venkataramanan rx_buf->page = NULL; 10182b245cb2SAnirudh Venkataramanan } 10192b245cb2SAnirudh Venkataramanan 10202b245cb2SAnirudh Venkataramanan /** 10212b245cb2SAnirudh Venkataramanan * ice_is_non_eop - process handling of non-EOP buffers 10222b245cb2SAnirudh Venkataramanan * @rx_ring: Rx ring being processed 10232b245cb2SAnirudh Venkataramanan * @rx_desc: Rx descriptor for current buffer 10242b245cb2SAnirudh Venkataramanan * 1025efc2214bSMaciej Fijalkowski * If the buffer is an EOP buffer, this function exits returning false, 1026efc2214bSMaciej Fijalkowski * otherwise return true indicating that this is in fact a non-EOP buffer. 10272b245cb2SAnirudh Venkataramanan */ 1028c8b7abddSBruce Allan static bool 102929b82f2aSMaciej Fijalkowski ice_is_non_eop(struct ice_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc) 10302b245cb2SAnirudh Venkataramanan { 10312b245cb2SAnirudh Venkataramanan /* if we are the last buffer then there is nothing else to do */ 10322b245cb2SAnirudh Venkataramanan #define ICE_RXD_EOF BIT(ICE_RX_FLEX_DESC_STATUS0_EOF_S) 10332b245cb2SAnirudh Venkataramanan if (likely(ice_test_staterr(rx_desc, ICE_RXD_EOF))) 10342b245cb2SAnirudh Venkataramanan return false; 10352b245cb2SAnirudh Venkataramanan 10362b245cb2SAnirudh Venkataramanan rx_ring->rx_stats.non_eop_descs++; 10372b245cb2SAnirudh Venkataramanan 10382b245cb2SAnirudh Venkataramanan return true; 10392b245cb2SAnirudh Venkataramanan } 10402b245cb2SAnirudh Venkataramanan 10412b245cb2SAnirudh Venkataramanan /** 10422b245cb2SAnirudh Venkataramanan * ice_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf 1043d337f2afSAnirudh Venkataramanan * @rx_ring: Rx descriptor ring to transact packets on 10442b245cb2SAnirudh Venkataramanan * @budget: Total limit on number of packets to process 10452b245cb2SAnirudh Venkataramanan * 10462b245cb2SAnirudh Venkataramanan * This function provides a "bounce buffer" approach to Rx interrupt 10472b245cb2SAnirudh Venkataramanan * processing. The advantage to this is that on systems that have 10482b245cb2SAnirudh Venkataramanan * expensive overhead for IOMMU access this provides a means of avoiding 10492b245cb2SAnirudh Venkataramanan * it by maintaining the mapping of the page to the system. 10502b245cb2SAnirudh Venkataramanan * 10512b245cb2SAnirudh Venkataramanan * Returns amount of work completed 10522b245cb2SAnirudh Venkataramanan */ 1053148beb61SHenry Tieman int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget) 10542b245cb2SAnirudh Venkataramanan { 105543b5169dSLorenzo Bianconi unsigned int total_rx_bytes = 0, total_rx_pkts = 0, frame_sz = 0; 10562b245cb2SAnirudh Venkataramanan u16 cleaned_count = ICE_DESC_UNUSED(rx_ring); 1057f1b1f409SMaciej Fijalkowski unsigned int offset = rx_ring->rx_offset; 1058efc2214bSMaciej Fijalkowski unsigned int xdp_res, xdp_xmit = 0; 105929b82f2aSMaciej Fijalkowski struct sk_buff *skb = rx_ring->skb; 1060efc2214bSMaciej Fijalkowski struct bpf_prog *xdp_prog = NULL; 1061efc2214bSMaciej Fijalkowski struct xdp_buff xdp; 1062cb7db356SBrett Creeley bool failure; 10632b245cb2SAnirudh Venkataramanan 1064d4ecdbf7SJesper Dangaard Brouer /* Frame size depend on rx_ring setup when PAGE_SIZE=4K */ 1065d4ecdbf7SJesper Dangaard Brouer #if (PAGE_SIZE < 8192) 106643b5169dSLorenzo Bianconi frame_sz = ice_rx_frame_truesize(rx_ring, 0); 1067d4ecdbf7SJesper Dangaard Brouer #endif 106843b5169dSLorenzo Bianconi xdp_init_buff(&xdp, frame_sz, &rx_ring->xdp_rxq); 1069efc2214bSMaciej Fijalkowski 1070f9867df6SAnirudh Venkataramanan /* start the loop to process Rx packets bounded by 'budget' */ 10712b245cb2SAnirudh Venkataramanan while (likely(total_rx_pkts < (unsigned int)budget)) { 10722b245cb2SAnirudh Venkataramanan union ice_32b_rx_flex_desc *rx_desc; 10736c869cb7SMaciej Fijalkowski struct ice_rx_buf *rx_buf; 1074be9df4afSLorenzo Bianconi unsigned char *hard_start; 10756c869cb7SMaciej Fijalkowski unsigned int size; 10762b245cb2SAnirudh Venkataramanan u16 stat_err_bits; 10771beb7830SBjörn Töpel int rx_buf_pgcnt; 10782b245cb2SAnirudh Venkataramanan u16 vlan_tag = 0; 1079d76a60baSAnirudh Venkataramanan u8 rx_ptype; 10802b245cb2SAnirudh Venkataramanan 1081f9867df6SAnirudh Venkataramanan /* get the Rx desc from Rx ring based on 'next_to_clean' */ 10822b245cb2SAnirudh Venkataramanan rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean); 10832b245cb2SAnirudh Venkataramanan 10842b245cb2SAnirudh Venkataramanan /* status_error_len will always be zero for unused descriptors 10852b245cb2SAnirudh Venkataramanan * because it's cleared in cleanup, and overlaps with hdr_addr 10862b245cb2SAnirudh Venkataramanan * which is always zero because packet split isn't used, if the 10872b245cb2SAnirudh Venkataramanan * hardware wrote DD then it will be non-zero 10882b245cb2SAnirudh Venkataramanan */ 10892b245cb2SAnirudh Venkataramanan stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S); 10902b245cb2SAnirudh Venkataramanan if (!ice_test_staterr(rx_desc, stat_err_bits)) 10912b245cb2SAnirudh Venkataramanan break; 10922b245cb2SAnirudh Venkataramanan 10932b245cb2SAnirudh Venkataramanan /* This memory barrier is needed to keep us from reading 10942b245cb2SAnirudh Venkataramanan * any other fields out of the rx_desc until we know the 10952b245cb2SAnirudh Venkataramanan * DD bit is set. 10962b245cb2SAnirudh Venkataramanan */ 10972b245cb2SAnirudh Venkataramanan dma_rmb(); 10982b245cb2SAnirudh Venkataramanan 1099148beb61SHenry Tieman if (rx_desc->wb.rxdid == FDIR_DESC_RXDID || !rx_ring->netdev) { 1100d6218317SQi Zhang struct ice_vsi *ctrl_vsi = rx_ring->vsi; 1101d6218317SQi Zhang 1102d6218317SQi Zhang if (rx_desc->wb.rxdid == FDIR_DESC_RXDID && 1103d6218317SQi Zhang ctrl_vsi->vf_id != ICE_INVAL_VFID) 1104d6218317SQi Zhang ice_vc_fdir_irq_handler(ctrl_vsi, rx_desc); 11051beb7830SBjörn Töpel ice_put_rx_buf(rx_ring, NULL, 0); 1106148beb61SHenry Tieman cleaned_count++; 1107148beb61SHenry Tieman continue; 1108148beb61SHenry Tieman } 1109148beb61SHenry Tieman 11106c869cb7SMaciej Fijalkowski size = le16_to_cpu(rx_desc->wb.pkt_len) & 11116c869cb7SMaciej Fijalkowski ICE_RX_FLX_DESC_PKT_LEN_M; 11122b245cb2SAnirudh Venkataramanan 1113ac6f733aSMitch Williams /* retrieve a buffer from the ring */ 111429b82f2aSMaciej Fijalkowski rx_buf = ice_get_rx_buf(rx_ring, size, &rx_buf_pgcnt); 1115ac6f733aSMitch Williams 1116efc2214bSMaciej Fijalkowski if (!size) { 1117efc2214bSMaciej Fijalkowski xdp.data = NULL; 1118efc2214bSMaciej Fijalkowski xdp.data_end = NULL; 1119aaf27254SMaciej Fijalkowski xdp.data_hard_start = NULL; 1120aaf27254SMaciej Fijalkowski xdp.data_meta = NULL; 1121efc2214bSMaciej Fijalkowski goto construct_skb; 1122efc2214bSMaciej Fijalkowski } 1123efc2214bSMaciej Fijalkowski 1124be9df4afSLorenzo Bianconi hard_start = page_address(rx_buf->page) + rx_buf->page_offset - 1125be9df4afSLorenzo Bianconi offset; 1126be9df4afSLorenzo Bianconi xdp_prepare_buff(&xdp, hard_start, offset, size, true); 1127d4ecdbf7SJesper Dangaard Brouer #if (PAGE_SIZE > 4096) 1128d4ecdbf7SJesper Dangaard Brouer /* At larger PAGE_SIZE, frame_sz depend on len size */ 1129d4ecdbf7SJesper Dangaard Brouer xdp.frame_sz = ice_rx_frame_truesize(rx_ring, size); 1130d4ecdbf7SJesper Dangaard Brouer #endif 1131efc2214bSMaciej Fijalkowski 1132efc2214bSMaciej Fijalkowski rcu_read_lock(); 1133efc2214bSMaciej Fijalkowski xdp_prog = READ_ONCE(rx_ring->xdp_prog); 1134efc2214bSMaciej Fijalkowski if (!xdp_prog) { 1135efc2214bSMaciej Fijalkowski rcu_read_unlock(); 1136efc2214bSMaciej Fijalkowski goto construct_skb; 1137efc2214bSMaciej Fijalkowski } 1138efc2214bSMaciej Fijalkowski 1139efc2214bSMaciej Fijalkowski xdp_res = ice_run_xdp(rx_ring, &xdp, xdp_prog); 1140efc2214bSMaciej Fijalkowski rcu_read_unlock(); 114159bb0808SMaciej Fijalkowski if (!xdp_res) 114259bb0808SMaciej Fijalkowski goto construct_skb; 1143efc2214bSMaciej Fijalkowski if (xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR)) { 1144efc2214bSMaciej Fijalkowski xdp_xmit |= xdp_res; 1145d4ecdbf7SJesper Dangaard Brouer ice_rx_buf_adjust_pg_offset(rx_buf, xdp.frame_sz); 1146efc2214bSMaciej Fijalkowski } else { 1147efc2214bSMaciej Fijalkowski rx_buf->pagecnt_bias++; 1148efc2214bSMaciej Fijalkowski } 1149efc2214bSMaciej Fijalkowski total_rx_bytes += size; 1150efc2214bSMaciej Fijalkowski total_rx_pkts++; 1151efc2214bSMaciej Fijalkowski 1152efc2214bSMaciej Fijalkowski cleaned_count++; 11531beb7830SBjörn Töpel ice_put_rx_buf(rx_ring, rx_buf, rx_buf_pgcnt); 1154efc2214bSMaciej Fijalkowski continue; 1155efc2214bSMaciej Fijalkowski construct_skb: 11561f45ebe0SMitch Williams if (skb) { 11577237f5b0SMaciej Fijalkowski ice_add_rx_frag(rx_ring, rx_buf, skb, size); 11581f45ebe0SMitch Williams } else if (likely(xdp.data)) { 11591f45ebe0SMitch Williams if (ice_ring_uses_build_skb(rx_ring)) 1160aaf27254SMaciej Fijalkowski skb = ice_build_skb(rx_ring, rx_buf, &xdp); 1161712edbbbSMaciej Fijalkowski else 1162efc2214bSMaciej Fijalkowski skb = ice_construct_skb(rx_ring, rx_buf, &xdp); 11631f45ebe0SMitch Williams } 1164712edbbbSMaciej Fijalkowski /* exit if we failed to retrieve a buffer */ 1165712edbbbSMaciej Fijalkowski if (!skb) { 1166712edbbbSMaciej Fijalkowski rx_ring->rx_stats.alloc_buf_failed++; 1167ac6f733aSMitch Williams if (rx_buf) 1168712edbbbSMaciej Fijalkowski rx_buf->pagecnt_bias++; 11692b245cb2SAnirudh Venkataramanan break; 1170712edbbbSMaciej Fijalkowski } 11712b245cb2SAnirudh Venkataramanan 11721beb7830SBjörn Töpel ice_put_rx_buf(rx_ring, rx_buf, rx_buf_pgcnt); 11732b245cb2SAnirudh Venkataramanan cleaned_count++; 11742b245cb2SAnirudh Venkataramanan 11752b245cb2SAnirudh Venkataramanan /* skip if it is NOP desc */ 117629b82f2aSMaciej Fijalkowski if (ice_is_non_eop(rx_ring, rx_desc)) 11772b245cb2SAnirudh Venkataramanan continue; 11782b245cb2SAnirudh Venkataramanan 11792b245cb2SAnirudh Venkataramanan stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_RXE_S); 11802b245cb2SAnirudh Venkataramanan if (unlikely(ice_test_staterr(rx_desc, stat_err_bits))) { 11812b245cb2SAnirudh Venkataramanan dev_kfree_skb_any(skb); 11822b245cb2SAnirudh Venkataramanan continue; 11832b245cb2SAnirudh Venkataramanan } 11842b245cb2SAnirudh Venkataramanan 11852b245cb2SAnirudh Venkataramanan stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_L2TAG1P_S); 11862b245cb2SAnirudh Venkataramanan if (ice_test_staterr(rx_desc, stat_err_bits)) 11872b245cb2SAnirudh Venkataramanan vlan_tag = le16_to_cpu(rx_desc->wb.l2tag1); 11882b245cb2SAnirudh Venkataramanan 1189133f4883SKrzysztof Kazimierczak /* pad the skb if needed, to make a valid ethernet frame */ 1190133f4883SKrzysztof Kazimierczak if (eth_skb_pad(skb)) { 11912b245cb2SAnirudh Venkataramanan skb = NULL; 11922b245cb2SAnirudh Venkataramanan continue; 11932b245cb2SAnirudh Venkataramanan } 11942b245cb2SAnirudh Venkataramanan 11952b245cb2SAnirudh Venkataramanan /* probably a little skewed due to removing CRC */ 11962b245cb2SAnirudh Venkataramanan total_rx_bytes += skb->len; 11972b245cb2SAnirudh Venkataramanan 1198d76a60baSAnirudh Venkataramanan /* populate checksum, VLAN, and protocol */ 11996503b659SJesse Brandeburg rx_ptype = le16_to_cpu(rx_desc->wb.ptype_flex_flags0) & 12006503b659SJesse Brandeburg ICE_RX_FLEX_DESC_PTYPE_M; 12016503b659SJesse Brandeburg 1202d76a60baSAnirudh Venkataramanan ice_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype); 1203d76a60baSAnirudh Venkataramanan 12042b245cb2SAnirudh Venkataramanan /* send completed skb up the stack */ 12052b245cb2SAnirudh Venkataramanan ice_receive_skb(rx_ring, skb, vlan_tag); 120629b82f2aSMaciej Fijalkowski skb = NULL; 12072b245cb2SAnirudh Venkataramanan 12082b245cb2SAnirudh Venkataramanan /* update budget accounting */ 12092b245cb2SAnirudh Venkataramanan total_rx_pkts++; 12102b245cb2SAnirudh Venkataramanan } 12112b245cb2SAnirudh Venkataramanan 1212cb7db356SBrett Creeley /* return up to cleaned_count buffers to hardware */ 1213cb7db356SBrett Creeley failure = ice_alloc_rx_bufs(rx_ring, cleaned_count); 1214cb7db356SBrett Creeley 1215efc2214bSMaciej Fijalkowski if (xdp_prog) 1216efc2214bSMaciej Fijalkowski ice_finalize_xdp_rx(rx_ring, xdp_xmit); 121729b82f2aSMaciej Fijalkowski rx_ring->skb = skb; 1218efc2214bSMaciej Fijalkowski 12192d4238f5SKrzysztof Kazimierczak ice_update_rx_ring_stats(rx_ring, total_rx_pkts, total_rx_bytes); 12202b245cb2SAnirudh Venkataramanan 12212b245cb2SAnirudh Venkataramanan /* guarantee a trip back through this routine if there was a failure */ 12222b245cb2SAnirudh Venkataramanan return failure ? budget : (int)total_rx_pkts; 12232b245cb2SAnirudh Venkataramanan } 12242b245cb2SAnirudh Venkataramanan 12252b245cb2SAnirudh Venkataramanan /** 1226cdf1f1f1SJacob Keller * ice_net_dim - Update net DIM algorithm 1227cdf1f1f1SJacob Keller * @q_vector: the vector associated with the interrupt 1228711987bbSBrett Creeley * 1229cdf1f1f1SJacob Keller * Create a DIM sample and notify net_dim() so that it can possibly decide 1230cdf1f1f1SJacob Keller * a new ITR value based on incoming packets, bytes, and interrupts. 1231711987bbSBrett Creeley * 1232cdf1f1f1SJacob Keller * This function is a no-op if the ring is not configured to dynamic ITR. 1233711987bbSBrett Creeley */ 1234cdf1f1f1SJacob Keller static void ice_net_dim(struct ice_q_vector *q_vector) 123564a59d05SAnirudh Venkataramanan { 1236cdf1f1f1SJacob Keller struct ice_ring_container *tx = &q_vector->tx; 1237cdf1f1f1SJacob Keller struct ice_ring_container *rx = &q_vector->rx; 1238cdf1f1f1SJacob Keller 1239cdf1f1f1SJacob Keller if (ITR_IS_DYNAMIC(tx->itr_setting)) { 1240cdf1f1f1SJacob Keller struct dim_sample dim_sample = {}; 1241cdf1f1f1SJacob Keller u64 packets = 0, bytes = 0; 1242cdf1f1f1SJacob Keller struct ice_ring *ring; 1243cdf1f1f1SJacob Keller 1244cdf1f1f1SJacob Keller ice_for_each_ring(ring, q_vector->tx) { 1245cdf1f1f1SJacob Keller packets += ring->stats.pkts; 1246cdf1f1f1SJacob Keller bytes += ring->stats.bytes; 124764a59d05SAnirudh Venkataramanan } 1248711987bbSBrett Creeley 1249cdf1f1f1SJacob Keller dim_update_sample(q_vector->total_events, packets, bytes, 1250cdf1f1f1SJacob Keller &dim_sample); 1251cdf1f1f1SJacob Keller 1252cdf1f1f1SJacob Keller net_dim(&tx->dim, dim_sample); 1253711987bbSBrett Creeley } 1254711987bbSBrett Creeley 1255cdf1f1f1SJacob Keller if (ITR_IS_DYNAMIC(rx->itr_setting)) { 1256cdf1f1f1SJacob Keller struct dim_sample dim_sample = {}; 1257cdf1f1f1SJacob Keller u64 packets = 0, bytes = 0; 1258cdf1f1f1SJacob Keller struct ice_ring *ring; 1259cdf1f1f1SJacob Keller 1260cdf1f1f1SJacob Keller ice_for_each_ring(ring, q_vector->rx) { 1261cdf1f1f1SJacob Keller packets += ring->stats.pkts; 1262cdf1f1f1SJacob Keller bytes += ring->stats.bytes; 126364a59d05SAnirudh Venkataramanan } 126464a59d05SAnirudh Venkataramanan 1265cdf1f1f1SJacob Keller dim_update_sample(q_vector->total_events, packets, bytes, 1266cdf1f1f1SJacob Keller &dim_sample); 126764a59d05SAnirudh Venkataramanan 1268cdf1f1f1SJacob Keller net_dim(&rx->dim, dim_sample); 126964a59d05SAnirudh Venkataramanan } 127064a59d05SAnirudh Venkataramanan } 127164a59d05SAnirudh Venkataramanan 12722b245cb2SAnirudh Venkataramanan /** 127363f545edSBrett Creeley * ice_buildreg_itr - build value for writing to the GLINT_DYN_CTL register 127463f545edSBrett Creeley * @itr_idx: interrupt throttling index 127564a59d05SAnirudh Venkataramanan * @itr: interrupt throttling value in usecs 127663f545edSBrett Creeley */ 12778244dd2dSBrett Creeley static u32 ice_buildreg_itr(u16 itr_idx, u16 itr) 127863f545edSBrett Creeley { 12792f2da36eSAnirudh Venkataramanan /* The ITR value is reported in microseconds, and the register value is 128064a59d05SAnirudh Venkataramanan * recorded in 2 microsecond units. For this reason we only need to 128164a59d05SAnirudh Venkataramanan * shift by the GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S to apply this 128264a59d05SAnirudh Venkataramanan * granularity as a shift instead of division. The mask makes sure the 128364a59d05SAnirudh Venkataramanan * ITR value is never odd so we don't accidentally write into the field 128464a59d05SAnirudh Venkataramanan * prior to the ITR field. 128564a59d05SAnirudh Venkataramanan */ 128664a59d05SAnirudh Venkataramanan itr &= ICE_ITR_MASK; 128764a59d05SAnirudh Venkataramanan 128863f545edSBrett Creeley return GLINT_DYN_CTL_INTENA_M | GLINT_DYN_CTL_CLEARPBA_M | 128963f545edSBrett Creeley (itr_idx << GLINT_DYN_CTL_ITR_INDX_S) | 129064a59d05SAnirudh Venkataramanan (itr << (GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S)); 129163f545edSBrett Creeley } 129263f545edSBrett Creeley 129363f545edSBrett Creeley /** 1294cdf1f1f1SJacob Keller * ice_update_ena_itr - Update ITR moderation and re-enable MSI-X interrupt 1295cdf1f1f1SJacob Keller * @q_vector: the vector associated with the interrupt to enable 1296cdf1f1f1SJacob Keller * 1297cdf1f1f1SJacob Keller * Update the net_dim() algorithm and re-enable the interrupt associated with 1298cdf1f1f1SJacob Keller * this vector. 1299cdf1f1f1SJacob Keller * 1300cdf1f1f1SJacob Keller * If the VSI is down, the interrupt will not be re-enabled. 130163f545edSBrett Creeley */ 13022fb0821fSJesse Brandeburg static void ice_update_ena_itr(struct ice_q_vector *q_vector) 130363f545edSBrett Creeley { 13042fb0821fSJesse Brandeburg struct ice_vsi *vsi = q_vector->vsi; 1305*b7306b42SJesse Brandeburg bool wb_en = q_vector->wb_on_itr; 130663f545edSBrett Creeley u32 itr_val; 130763f545edSBrett Creeley 1308cdf1f1f1SJacob Keller if (test_bit(ICE_DOWN, vsi->state)) 1309cdf1f1f1SJacob Keller return; 13102ab28bb0SBrett Creeley 1311cdf1f1f1SJacob Keller /* When exiting WB_ON_ITR, let ITR resume its normal 1312cdf1f1f1SJacob Keller * interrupts-enabled path. 1313cdf1f1f1SJacob Keller */ 1314*b7306b42SJesse Brandeburg if (wb_en) 1315cdf1f1f1SJacob Keller q_vector->wb_on_itr = false; 131664a59d05SAnirudh Venkataramanan 1317cdf1f1f1SJacob Keller /* This will do nothing if dynamic updates are not enabled. */ 1318cdf1f1f1SJacob Keller ice_net_dim(q_vector); 1319cdf1f1f1SJacob Keller 1320cdf1f1f1SJacob Keller /* net_dim() updates ITR out-of-band using a work item */ 132163f545edSBrett Creeley itr_val = ice_buildreg_itr(ICE_ITR_NONE, 0); 1322*b7306b42SJesse Brandeburg /* trigger an immediate software interrupt when exiting 1323*b7306b42SJesse Brandeburg * busy poll, to make sure to catch any pending cleanups 1324*b7306b42SJesse Brandeburg * that might have been missed due to interrupt state 1325*b7306b42SJesse Brandeburg * transition. 1326*b7306b42SJesse Brandeburg */ 1327*b7306b42SJesse Brandeburg if (wb_en) { 1328*b7306b42SJesse Brandeburg itr_val |= GLINT_DYN_CTL_SWINT_TRIG_M | 1329*b7306b42SJesse Brandeburg GLINT_DYN_CTL_SW_ITR_INDX_M | 1330*b7306b42SJesse Brandeburg GLINT_DYN_CTL_SW_ITR_INDX_ENA_M; 1331*b7306b42SJesse Brandeburg } 13321d9f7ca3SJesse Brandeburg wr32(&vsi->back->hw, GLINT_DYN_CTL(q_vector->reg_idx), itr_val); 133363f545edSBrett Creeley } 133463f545edSBrett Creeley 133563f545edSBrett Creeley /** 13362ab28bb0SBrett Creeley * ice_set_wb_on_itr - set WB_ON_ITR for this q_vector 13372ab28bb0SBrett Creeley * @q_vector: q_vector to set WB_ON_ITR on 13382ab28bb0SBrett Creeley * 13392ab28bb0SBrett Creeley * We need to tell hardware to write-back completed descriptors even when 13402ab28bb0SBrett Creeley * interrupts are disabled. Descriptors will be written back on cache line 13412ab28bb0SBrett Creeley * boundaries without WB_ON_ITR enabled, but if we don't enable WB_ON_ITR 13421d9f7ca3SJesse Brandeburg * descriptors may not be written back if they don't fill a cache line until 13431d9f7ca3SJesse Brandeburg * the next interrupt. 13442ab28bb0SBrett Creeley * 13451d9f7ca3SJesse Brandeburg * This sets the write-back frequency to whatever was set previously for the 13461d9f7ca3SJesse Brandeburg * ITR indices. Also, set the INTENA_MSK bit to make sure hardware knows we 13471d9f7ca3SJesse Brandeburg * aren't meddling with the INTENA_M bit. 13482ab28bb0SBrett Creeley */ 13492fb0821fSJesse Brandeburg static void ice_set_wb_on_itr(struct ice_q_vector *q_vector) 13502ab28bb0SBrett Creeley { 13512fb0821fSJesse Brandeburg struct ice_vsi *vsi = q_vector->vsi; 13522fb0821fSJesse Brandeburg 13531d9f7ca3SJesse Brandeburg /* already in wb_on_itr mode no need to change it */ 1354cdf1f1f1SJacob Keller if (q_vector->wb_on_itr) 13552ab28bb0SBrett Creeley return; 13562ab28bb0SBrett Creeley 13571d9f7ca3SJesse Brandeburg /* use previously set ITR values for all of the ITR indices by 13581d9f7ca3SJesse Brandeburg * specifying ICE_ITR_NONE, which will vary in adaptive (AIM) mode and 13591d9f7ca3SJesse Brandeburg * be static in non-adaptive mode (user configured) 13601d9f7ca3SJesse Brandeburg */ 13612ab28bb0SBrett Creeley wr32(&vsi->back->hw, GLINT_DYN_CTL(q_vector->reg_idx), 13621d9f7ca3SJesse Brandeburg ((ICE_ITR_NONE << GLINT_DYN_CTL_ITR_INDX_S) & 13631d9f7ca3SJesse Brandeburg GLINT_DYN_CTL_ITR_INDX_M) | GLINT_DYN_CTL_INTENA_MSK_M | 13641d9f7ca3SJesse Brandeburg GLINT_DYN_CTL_WB_ON_ITR_M); 13652ab28bb0SBrett Creeley 1366cdf1f1f1SJacob Keller q_vector->wb_on_itr = true; 13672ab28bb0SBrett Creeley } 13682ab28bb0SBrett Creeley 13692ab28bb0SBrett Creeley /** 13702b245cb2SAnirudh Venkataramanan * ice_napi_poll - NAPI polling Rx/Tx cleanup routine 13712b245cb2SAnirudh Venkataramanan * @napi: napi struct with our devices info in it 13722b245cb2SAnirudh Venkataramanan * @budget: amount of work driver is allowed to do this pass, in packets 13732b245cb2SAnirudh Venkataramanan * 13742b245cb2SAnirudh Venkataramanan * This function will clean all queues associated with a q_vector. 13752b245cb2SAnirudh Venkataramanan * 13762b245cb2SAnirudh Venkataramanan * Returns the amount of work done 13772b245cb2SAnirudh Venkataramanan */ 13782b245cb2SAnirudh Venkataramanan int ice_napi_poll(struct napi_struct *napi, int budget) 13792b245cb2SAnirudh Venkataramanan { 13802b245cb2SAnirudh Venkataramanan struct ice_q_vector *q_vector = 13812b245cb2SAnirudh Venkataramanan container_of(napi, struct ice_q_vector, napi); 13822b245cb2SAnirudh Venkataramanan bool clean_complete = true; 13832b245cb2SAnirudh Venkataramanan struct ice_ring *ring; 13849118fcd5SBrett Creeley int budget_per_ring; 13852b245cb2SAnirudh Venkataramanan int work_done = 0; 13862b245cb2SAnirudh Venkataramanan 13872b245cb2SAnirudh Venkataramanan /* Since the actual Tx work is minimal, we can give the Tx a larger 13882b245cb2SAnirudh Venkataramanan * budget and be more aggressive about cleaning up the Tx descriptors. 13892b245cb2SAnirudh Venkataramanan */ 13902d4238f5SKrzysztof Kazimierczak ice_for_each_ring(ring, q_vector->tx) { 13911742b3d5SMagnus Karlsson bool wd = ring->xsk_pool ? 13922d4238f5SKrzysztof Kazimierczak ice_clean_tx_irq_zc(ring, budget) : 13932d4238f5SKrzysztof Kazimierczak ice_clean_tx_irq(ring, budget); 13942d4238f5SKrzysztof Kazimierczak 13952d4238f5SKrzysztof Kazimierczak if (!wd) 13962b245cb2SAnirudh Venkataramanan clean_complete = false; 13972d4238f5SKrzysztof Kazimierczak } 13982b245cb2SAnirudh Venkataramanan 13992b245cb2SAnirudh Venkataramanan /* Handle case where we are called by netpoll with a budget of 0 */ 1400d27525ecSJesse Brandeburg if (unlikely(budget <= 0)) 14012b245cb2SAnirudh Venkataramanan return budget; 14022b245cb2SAnirudh Venkataramanan 14039118fcd5SBrett Creeley /* normally we have 1 Rx ring per q_vector */ 14049118fcd5SBrett Creeley if (unlikely(q_vector->num_ring_rx > 1)) 14059118fcd5SBrett Creeley /* We attempt to distribute budget to each Rx queue fairly, but 14069118fcd5SBrett Creeley * don't allow the budget to go below 1 because that would exit 14079118fcd5SBrett Creeley * polling early. 14082b245cb2SAnirudh Venkataramanan */ 140988865fc4SKarol Kolacinski budget_per_ring = max_t(int, budget / q_vector->num_ring_rx, 1); 14109118fcd5SBrett Creeley else 14119118fcd5SBrett Creeley /* Max of 1 Rx ring in this q_vector so give it the budget */ 14129118fcd5SBrett Creeley budget_per_ring = budget; 14132b245cb2SAnirudh Venkataramanan 14142b245cb2SAnirudh Venkataramanan ice_for_each_ring(ring, q_vector->rx) { 14152b245cb2SAnirudh Venkataramanan int cleaned; 14162b245cb2SAnirudh Venkataramanan 14172d4238f5SKrzysztof Kazimierczak /* A dedicated path for zero-copy allows making a single 14182d4238f5SKrzysztof Kazimierczak * comparison in the irq context instead of many inside the 14192d4238f5SKrzysztof Kazimierczak * ice_clean_rx_irq function and makes the codebase cleaner. 14202d4238f5SKrzysztof Kazimierczak */ 14211742b3d5SMagnus Karlsson cleaned = ring->xsk_pool ? 14222d4238f5SKrzysztof Kazimierczak ice_clean_rx_irq_zc(ring, budget_per_ring) : 14232d4238f5SKrzysztof Kazimierczak ice_clean_rx_irq(ring, budget_per_ring); 14242b245cb2SAnirudh Venkataramanan work_done += cleaned; 14252b245cb2SAnirudh Venkataramanan /* if we clean as many as budgeted, we must not be done */ 14262b245cb2SAnirudh Venkataramanan if (cleaned >= budget_per_ring) 14272b245cb2SAnirudh Venkataramanan clean_complete = false; 14282b245cb2SAnirudh Venkataramanan } 14292b245cb2SAnirudh Venkataramanan 14302b245cb2SAnirudh Venkataramanan /* If work not completed, return budget and polling will return */ 14311d9f7ca3SJesse Brandeburg if (!clean_complete) { 14321d9f7ca3SJesse Brandeburg /* Set the writeback on ITR so partial completions of 14331d9f7ca3SJesse Brandeburg * cache-lines will still continue even if we're polling. 14341d9f7ca3SJesse Brandeburg */ 14351d9f7ca3SJesse Brandeburg ice_set_wb_on_itr(q_vector); 14362b245cb2SAnirudh Venkataramanan return budget; 14371d9f7ca3SJesse Brandeburg } 14382b245cb2SAnirudh Venkataramanan 14390bcd952fSJesse Brandeburg /* Exit the polling mode, but don't re-enable interrupts if stack might 14400bcd952fSJesse Brandeburg * poll us due to busy-polling 14410bcd952fSJesse Brandeburg */ 14420bcd952fSJesse Brandeburg if (likely(napi_complete_done(napi, work_done))) 14432fb0821fSJesse Brandeburg ice_update_ena_itr(q_vector); 14442ab28bb0SBrett Creeley else 14452fb0821fSJesse Brandeburg ice_set_wb_on_itr(q_vector); 1446e0c9fd9bSDave Ertman 144732a64994SBruce Allan return min_t(int, work_done, budget - 1); 14482b245cb2SAnirudh Venkataramanan } 14492b245cb2SAnirudh Venkataramanan 14502b245cb2SAnirudh Venkataramanan /** 1451d337f2afSAnirudh Venkataramanan * __ice_maybe_stop_tx - 2nd level check for Tx stop conditions 14522b245cb2SAnirudh Venkataramanan * @tx_ring: the ring to be checked 14532b245cb2SAnirudh Venkataramanan * @size: the size buffer we want to assure is available 14542b245cb2SAnirudh Venkataramanan * 14552b245cb2SAnirudh Venkataramanan * Returns -EBUSY if a stop is needed, else 0 14562b245cb2SAnirudh Venkataramanan */ 14572b245cb2SAnirudh Venkataramanan static int __ice_maybe_stop_tx(struct ice_ring *tx_ring, unsigned int size) 14582b245cb2SAnirudh Venkataramanan { 14592b245cb2SAnirudh Venkataramanan netif_stop_subqueue(tx_ring->netdev, tx_ring->q_index); 14602b245cb2SAnirudh Venkataramanan /* Memory barrier before checking head and tail */ 14612b245cb2SAnirudh Venkataramanan smp_mb(); 14622b245cb2SAnirudh Venkataramanan 14632b245cb2SAnirudh Venkataramanan /* Check again in a case another CPU has just made room available. */ 14642b245cb2SAnirudh Venkataramanan if (likely(ICE_DESC_UNUSED(tx_ring) < size)) 14652b245cb2SAnirudh Venkataramanan return -EBUSY; 14662b245cb2SAnirudh Venkataramanan 14672b245cb2SAnirudh Venkataramanan /* A reprieve! - use start_subqueue because it doesn't call schedule */ 14682b245cb2SAnirudh Venkataramanan netif_start_subqueue(tx_ring->netdev, tx_ring->q_index); 14692b245cb2SAnirudh Venkataramanan ++tx_ring->tx_stats.restart_q; 14702b245cb2SAnirudh Venkataramanan return 0; 14712b245cb2SAnirudh Venkataramanan } 14722b245cb2SAnirudh Venkataramanan 14732b245cb2SAnirudh Venkataramanan /** 1474d337f2afSAnirudh Venkataramanan * ice_maybe_stop_tx - 1st level check for Tx stop conditions 14752b245cb2SAnirudh Venkataramanan * @tx_ring: the ring to be checked 14762b245cb2SAnirudh Venkataramanan * @size: the size buffer we want to assure is available 14772b245cb2SAnirudh Venkataramanan * 14782b245cb2SAnirudh Venkataramanan * Returns 0 if stop is not needed 14792b245cb2SAnirudh Venkataramanan */ 14802b245cb2SAnirudh Venkataramanan static int ice_maybe_stop_tx(struct ice_ring *tx_ring, unsigned int size) 14812b245cb2SAnirudh Venkataramanan { 14822b245cb2SAnirudh Venkataramanan if (likely(ICE_DESC_UNUSED(tx_ring) >= size)) 14832b245cb2SAnirudh Venkataramanan return 0; 1484d337f2afSAnirudh Venkataramanan 14852b245cb2SAnirudh Venkataramanan return __ice_maybe_stop_tx(tx_ring, size); 14862b245cb2SAnirudh Venkataramanan } 14872b245cb2SAnirudh Venkataramanan 14882b245cb2SAnirudh Venkataramanan /** 14892b245cb2SAnirudh Venkataramanan * ice_tx_map - Build the Tx descriptor 14902b245cb2SAnirudh Venkataramanan * @tx_ring: ring to send buffer on 14912b245cb2SAnirudh Venkataramanan * @first: first buffer info buffer to use 1492d76a60baSAnirudh Venkataramanan * @off: pointer to struct that holds offload parameters 14932b245cb2SAnirudh Venkataramanan * 14942b245cb2SAnirudh Venkataramanan * This function loops over the skb data pointed to by *first 14952b245cb2SAnirudh Venkataramanan * and gets a physical address for each memory location and programs 14962b245cb2SAnirudh Venkataramanan * it and the length into the transmit descriptor. 14972b245cb2SAnirudh Venkataramanan */ 1498d76a60baSAnirudh Venkataramanan static void 1499d76a60baSAnirudh Venkataramanan ice_tx_map(struct ice_ring *tx_ring, struct ice_tx_buf *first, 1500d76a60baSAnirudh Venkataramanan struct ice_tx_offload_params *off) 15012b245cb2SAnirudh Venkataramanan { 1502d76a60baSAnirudh Venkataramanan u64 td_offset, td_tag, td_cmd; 15032b245cb2SAnirudh Venkataramanan u16 i = tx_ring->next_to_use; 15042b245cb2SAnirudh Venkataramanan unsigned int data_len, size; 15052b245cb2SAnirudh Venkataramanan struct ice_tx_desc *tx_desc; 15062b245cb2SAnirudh Venkataramanan struct ice_tx_buf *tx_buf; 15072b245cb2SAnirudh Venkataramanan struct sk_buff *skb; 15084ee656bbSTony Nguyen skb_frag_t *frag; 15092b245cb2SAnirudh Venkataramanan dma_addr_t dma; 15102b245cb2SAnirudh Venkataramanan 1511d76a60baSAnirudh Venkataramanan td_tag = off->td_l2tag1; 1512d76a60baSAnirudh Venkataramanan td_cmd = off->td_cmd; 1513d76a60baSAnirudh Venkataramanan td_offset = off->td_offset; 15142b245cb2SAnirudh Venkataramanan skb = first->skb; 15152b245cb2SAnirudh Venkataramanan 15162b245cb2SAnirudh Venkataramanan data_len = skb->data_len; 15172b245cb2SAnirudh Venkataramanan size = skb_headlen(skb); 15182b245cb2SAnirudh Venkataramanan 15192b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, i); 15202b245cb2SAnirudh Venkataramanan 1521d76a60baSAnirudh Venkataramanan if (first->tx_flags & ICE_TX_FLAGS_HW_VLAN) { 1522d76a60baSAnirudh Venkataramanan td_cmd |= (u64)ICE_TX_DESC_CMD_IL2TAG1; 1523d76a60baSAnirudh Venkataramanan td_tag = (first->tx_flags & ICE_TX_FLAGS_VLAN_M) >> 1524d76a60baSAnirudh Venkataramanan ICE_TX_FLAGS_VLAN_S; 1525d76a60baSAnirudh Venkataramanan } 1526d76a60baSAnirudh Venkataramanan 15272b245cb2SAnirudh Venkataramanan dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE); 15282b245cb2SAnirudh Venkataramanan 15292b245cb2SAnirudh Venkataramanan tx_buf = first; 15302b245cb2SAnirudh Venkataramanan 15312b245cb2SAnirudh Venkataramanan for (frag = &skb_shinfo(skb)->frags[0];; frag++) { 15322b245cb2SAnirudh Venkataramanan unsigned int max_data = ICE_MAX_DATA_PER_TXD_ALIGNED; 15332b245cb2SAnirudh Venkataramanan 15342b245cb2SAnirudh Venkataramanan if (dma_mapping_error(tx_ring->dev, dma)) 15352b245cb2SAnirudh Venkataramanan goto dma_error; 15362b245cb2SAnirudh Venkataramanan 15372b245cb2SAnirudh Venkataramanan /* record length, and DMA address */ 15382b245cb2SAnirudh Venkataramanan dma_unmap_len_set(tx_buf, len, size); 15392b245cb2SAnirudh Venkataramanan dma_unmap_addr_set(tx_buf, dma, dma); 15402b245cb2SAnirudh Venkataramanan 15412b245cb2SAnirudh Venkataramanan /* align size to end of page */ 15422b245cb2SAnirudh Venkataramanan max_data += -dma & (ICE_MAX_READ_REQ_SIZE - 1); 15432b245cb2SAnirudh Venkataramanan tx_desc->buf_addr = cpu_to_le64(dma); 15442b245cb2SAnirudh Venkataramanan 15452b245cb2SAnirudh Venkataramanan /* account for data chunks larger than the hardware 15462b245cb2SAnirudh Venkataramanan * can handle 15472b245cb2SAnirudh Venkataramanan */ 15482b245cb2SAnirudh Venkataramanan while (unlikely(size > ICE_MAX_DATA_PER_TXD)) { 15492b245cb2SAnirudh Venkataramanan tx_desc->cmd_type_offset_bsz = 15505757cc7cSTony Nguyen ice_build_ctob(td_cmd, td_offset, max_data, 15515757cc7cSTony Nguyen td_tag); 15522b245cb2SAnirudh Venkataramanan 15532b245cb2SAnirudh Venkataramanan tx_desc++; 15542b245cb2SAnirudh Venkataramanan i++; 15552b245cb2SAnirudh Venkataramanan 15562b245cb2SAnirudh Venkataramanan if (i == tx_ring->count) { 15572b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, 0); 15582b245cb2SAnirudh Venkataramanan i = 0; 15592b245cb2SAnirudh Venkataramanan } 15602b245cb2SAnirudh Venkataramanan 15612b245cb2SAnirudh Venkataramanan dma += max_data; 15622b245cb2SAnirudh Venkataramanan size -= max_data; 15632b245cb2SAnirudh Venkataramanan 15642b245cb2SAnirudh Venkataramanan max_data = ICE_MAX_DATA_PER_TXD_ALIGNED; 15652b245cb2SAnirudh Venkataramanan tx_desc->buf_addr = cpu_to_le64(dma); 15662b245cb2SAnirudh Venkataramanan } 15672b245cb2SAnirudh Venkataramanan 15682b245cb2SAnirudh Venkataramanan if (likely(!data_len)) 15692b245cb2SAnirudh Venkataramanan break; 15702b245cb2SAnirudh Venkataramanan 15715757cc7cSTony Nguyen tx_desc->cmd_type_offset_bsz = ice_build_ctob(td_cmd, td_offset, 15722b245cb2SAnirudh Venkataramanan size, td_tag); 15732b245cb2SAnirudh Venkataramanan 15742b245cb2SAnirudh Venkataramanan tx_desc++; 15752b245cb2SAnirudh Venkataramanan i++; 15762b245cb2SAnirudh Venkataramanan 15772b245cb2SAnirudh Venkataramanan if (i == tx_ring->count) { 15782b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, 0); 15792b245cb2SAnirudh Venkataramanan i = 0; 15802b245cb2SAnirudh Venkataramanan } 15812b245cb2SAnirudh Venkataramanan 15822b245cb2SAnirudh Venkataramanan size = skb_frag_size(frag); 15832b245cb2SAnirudh Venkataramanan data_len -= size; 15842b245cb2SAnirudh Venkataramanan 15852b245cb2SAnirudh Venkataramanan dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size, 15862b245cb2SAnirudh Venkataramanan DMA_TO_DEVICE); 15872b245cb2SAnirudh Venkataramanan 15882b245cb2SAnirudh Venkataramanan tx_buf = &tx_ring->tx_buf[i]; 15892b245cb2SAnirudh Venkataramanan } 15902b245cb2SAnirudh Venkataramanan 15912b245cb2SAnirudh Venkataramanan /* record bytecount for BQL */ 15922b245cb2SAnirudh Venkataramanan netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount); 15932b245cb2SAnirudh Venkataramanan 15942b245cb2SAnirudh Venkataramanan /* record SW timestamp if HW timestamp is not available */ 15952b245cb2SAnirudh Venkataramanan skb_tx_timestamp(first->skb); 15962b245cb2SAnirudh Venkataramanan 15972b245cb2SAnirudh Venkataramanan i++; 15982b245cb2SAnirudh Venkataramanan if (i == tx_ring->count) 15992b245cb2SAnirudh Venkataramanan i = 0; 16002b245cb2SAnirudh Venkataramanan 16012b245cb2SAnirudh Venkataramanan /* write last descriptor with RS and EOP bits */ 1602efc2214bSMaciej Fijalkowski td_cmd |= (u64)ICE_TXD_LAST_DESC_CMD; 16035757cc7cSTony Nguyen tx_desc->cmd_type_offset_bsz = 16045757cc7cSTony Nguyen ice_build_ctob(td_cmd, td_offset, size, td_tag); 16052b245cb2SAnirudh Venkataramanan 16062b245cb2SAnirudh Venkataramanan /* Force memory writes to complete before letting h/w know there 16072b245cb2SAnirudh Venkataramanan * are new descriptors to fetch. 16082b245cb2SAnirudh Venkataramanan * 16092b245cb2SAnirudh Venkataramanan * We also use this memory barrier to make certain all of the 16102b245cb2SAnirudh Venkataramanan * status bits have been updated before next_to_watch is written. 16112b245cb2SAnirudh Venkataramanan */ 16122b245cb2SAnirudh Venkataramanan wmb(); 16132b245cb2SAnirudh Venkataramanan 16142b245cb2SAnirudh Venkataramanan /* set next_to_watch value indicating a packet is present */ 16152b245cb2SAnirudh Venkataramanan first->next_to_watch = tx_desc; 16162b245cb2SAnirudh Venkataramanan 16172b245cb2SAnirudh Venkataramanan tx_ring->next_to_use = i; 16182b245cb2SAnirudh Venkataramanan 16192b245cb2SAnirudh Venkataramanan ice_maybe_stop_tx(tx_ring, DESC_NEEDED); 16202b245cb2SAnirudh Venkataramanan 16212b245cb2SAnirudh Venkataramanan /* notify HW of packet */ 16224ee656bbSTony Nguyen if (netif_xmit_stopped(txring_txq(tx_ring)) || !netdev_xmit_more()) 16232b245cb2SAnirudh Venkataramanan writel(i, tx_ring->tail); 16242b245cb2SAnirudh Venkataramanan 16252b245cb2SAnirudh Venkataramanan return; 16262b245cb2SAnirudh Venkataramanan 16272b245cb2SAnirudh Venkataramanan dma_error: 16282f2da36eSAnirudh Venkataramanan /* clear DMA mappings for failed tx_buf map */ 16292b245cb2SAnirudh Venkataramanan for (;;) { 16302b245cb2SAnirudh Venkataramanan tx_buf = &tx_ring->tx_buf[i]; 16312b245cb2SAnirudh Venkataramanan ice_unmap_and_free_tx_buf(tx_ring, tx_buf); 16322b245cb2SAnirudh Venkataramanan if (tx_buf == first) 16332b245cb2SAnirudh Venkataramanan break; 16342b245cb2SAnirudh Venkataramanan if (i == 0) 16352b245cb2SAnirudh Venkataramanan i = tx_ring->count; 16362b245cb2SAnirudh Venkataramanan i--; 16372b245cb2SAnirudh Venkataramanan } 16382b245cb2SAnirudh Venkataramanan 16392b245cb2SAnirudh Venkataramanan tx_ring->next_to_use = i; 16402b245cb2SAnirudh Venkataramanan } 16412b245cb2SAnirudh Venkataramanan 16422b245cb2SAnirudh Venkataramanan /** 1643d76a60baSAnirudh Venkataramanan * ice_tx_csum - Enable Tx checksum offloads 1644d76a60baSAnirudh Venkataramanan * @first: pointer to the first descriptor 1645d76a60baSAnirudh Venkataramanan * @off: pointer to struct that holds offload parameters 1646d76a60baSAnirudh Venkataramanan * 1647d76a60baSAnirudh Venkataramanan * Returns 0 or error (negative) if checksum offload can't happen, 1 otherwise. 1648d76a60baSAnirudh Venkataramanan */ 1649d76a60baSAnirudh Venkataramanan static 1650d76a60baSAnirudh Venkataramanan int ice_tx_csum(struct ice_tx_buf *first, struct ice_tx_offload_params *off) 1651d76a60baSAnirudh Venkataramanan { 1652d76a60baSAnirudh Venkataramanan u32 l4_len = 0, l3_len = 0, l2_len = 0; 1653d76a60baSAnirudh Venkataramanan struct sk_buff *skb = first->skb; 1654d76a60baSAnirudh Venkataramanan union { 1655d76a60baSAnirudh Venkataramanan struct iphdr *v4; 1656d76a60baSAnirudh Venkataramanan struct ipv6hdr *v6; 1657d76a60baSAnirudh Venkataramanan unsigned char *hdr; 1658d76a60baSAnirudh Venkataramanan } ip; 1659d76a60baSAnirudh Venkataramanan union { 1660d76a60baSAnirudh Venkataramanan struct tcphdr *tcp; 1661d76a60baSAnirudh Venkataramanan unsigned char *hdr; 1662d76a60baSAnirudh Venkataramanan } l4; 1663d76a60baSAnirudh Venkataramanan __be16 frag_off, protocol; 1664d76a60baSAnirudh Venkataramanan unsigned char *exthdr; 1665d76a60baSAnirudh Venkataramanan u32 offset, cmd = 0; 1666d76a60baSAnirudh Venkataramanan u8 l4_proto = 0; 1667d76a60baSAnirudh Venkataramanan 1668d76a60baSAnirudh Venkataramanan if (skb->ip_summed != CHECKSUM_PARTIAL) 1669d76a60baSAnirudh Venkataramanan return 0; 1670d76a60baSAnirudh Venkataramanan 1671d76a60baSAnirudh Venkataramanan ip.hdr = skb_network_header(skb); 1672d76a60baSAnirudh Venkataramanan l4.hdr = skb_transport_header(skb); 1673d76a60baSAnirudh Venkataramanan 1674d76a60baSAnirudh Venkataramanan /* compute outer L2 header size */ 1675d76a60baSAnirudh Venkataramanan l2_len = ip.hdr - skb->data; 1676d76a60baSAnirudh Venkataramanan offset = (l2_len / 2) << ICE_TX_DESC_LEN_MACLEN_S; 1677d76a60baSAnirudh Venkataramanan 1678a4e82a81STony Nguyen protocol = vlan_get_protocol(skb); 1679a4e82a81STony Nguyen 1680a4e82a81STony Nguyen if (protocol == htons(ETH_P_IP)) 1681a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_IPV4; 1682a4e82a81STony Nguyen else if (protocol == htons(ETH_P_IPV6)) 1683a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_IPV6; 1684a4e82a81STony Nguyen 1685a4e82a81STony Nguyen if (skb->encapsulation) { 1686a4e82a81STony Nguyen bool gso_ena = false; 1687a4e82a81STony Nguyen u32 tunnel = 0; 1688a4e82a81STony Nguyen 1689a4e82a81STony Nguyen /* define outer network header type */ 1690a4e82a81STony Nguyen if (first->tx_flags & ICE_TX_FLAGS_IPV4) { 1691a4e82a81STony Nguyen tunnel |= (first->tx_flags & ICE_TX_FLAGS_TSO) ? 1692a4e82a81STony Nguyen ICE_TX_CTX_EIPT_IPV4 : 1693a4e82a81STony Nguyen ICE_TX_CTX_EIPT_IPV4_NO_CSUM; 1694a4e82a81STony Nguyen l4_proto = ip.v4->protocol; 1695a4e82a81STony Nguyen } else if (first->tx_flags & ICE_TX_FLAGS_IPV6) { 16961b0b0b58SNick Nunley int ret; 16971b0b0b58SNick Nunley 1698a4e82a81STony Nguyen tunnel |= ICE_TX_CTX_EIPT_IPV6; 1699a4e82a81STony Nguyen exthdr = ip.hdr + sizeof(*ip.v6); 1700a4e82a81STony Nguyen l4_proto = ip.v6->nexthdr; 17011b0b0b58SNick Nunley ret = ipv6_skip_exthdr(skb, exthdr - skb->data, 1702a4e82a81STony Nguyen &l4_proto, &frag_off); 17031b0b0b58SNick Nunley if (ret < 0) 17041b0b0b58SNick Nunley return -1; 1705a4e82a81STony Nguyen } 1706a4e82a81STony Nguyen 1707a4e82a81STony Nguyen /* define outer transport */ 1708a4e82a81STony Nguyen switch (l4_proto) { 1709a4e82a81STony Nguyen case IPPROTO_UDP: 1710a4e82a81STony Nguyen tunnel |= ICE_TXD_CTX_UDP_TUNNELING; 1711a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_TUNNEL; 1712a4e82a81STony Nguyen break; 1713a4e82a81STony Nguyen case IPPROTO_GRE: 1714a4e82a81STony Nguyen tunnel |= ICE_TXD_CTX_GRE_TUNNELING; 1715a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_TUNNEL; 1716a4e82a81STony Nguyen break; 1717a4e82a81STony Nguyen case IPPROTO_IPIP: 1718a4e82a81STony Nguyen case IPPROTO_IPV6: 1719a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_TUNNEL; 1720a4e82a81STony Nguyen l4.hdr = skb_inner_network_header(skb); 1721a4e82a81STony Nguyen break; 1722a4e82a81STony Nguyen default: 1723a4e82a81STony Nguyen if (first->tx_flags & ICE_TX_FLAGS_TSO) 1724d76a60baSAnirudh Venkataramanan return -1; 1725d76a60baSAnirudh Venkataramanan 1726a4e82a81STony Nguyen skb_checksum_help(skb); 1727a4e82a81STony Nguyen return 0; 1728a4e82a81STony Nguyen } 1729a4e82a81STony Nguyen 1730a4e82a81STony Nguyen /* compute outer L3 header size */ 1731a4e82a81STony Nguyen tunnel |= ((l4.hdr - ip.hdr) / 4) << 1732a4e82a81STony Nguyen ICE_TXD_CTX_QW0_EIPLEN_S; 1733a4e82a81STony Nguyen 1734a4e82a81STony Nguyen /* switch IP header pointer from outer to inner header */ 1735a4e82a81STony Nguyen ip.hdr = skb_inner_network_header(skb); 1736a4e82a81STony Nguyen 1737a4e82a81STony Nguyen /* compute tunnel header size */ 1738a4e82a81STony Nguyen tunnel |= ((ip.hdr - l4.hdr) / 2) << 1739a4e82a81STony Nguyen ICE_TXD_CTX_QW0_NATLEN_S; 1740a4e82a81STony Nguyen 1741a4e82a81STony Nguyen gso_ena = skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL; 1742a4e82a81STony Nguyen /* indicate if we need to offload outer UDP header */ 1743a4e82a81STony Nguyen if ((first->tx_flags & ICE_TX_FLAGS_TSO) && !gso_ena && 1744a4e82a81STony Nguyen (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) 1745a4e82a81STony Nguyen tunnel |= ICE_TXD_CTX_QW0_L4T_CS_M; 1746a4e82a81STony Nguyen 1747a4e82a81STony Nguyen /* record tunnel offload values */ 1748a4e82a81STony Nguyen off->cd_tunnel_params |= tunnel; 1749a4e82a81STony Nguyen 1750a4e82a81STony Nguyen /* set DTYP=1 to indicate that it's an Tx context descriptor 1751a4e82a81STony Nguyen * in IPsec tunnel mode with Tx offloads in Quad word 1 1752a4e82a81STony Nguyen */ 1753a4e82a81STony Nguyen off->cd_qw1 |= (u64)ICE_TX_DESC_DTYPE_CTX; 1754a4e82a81STony Nguyen 1755a4e82a81STony Nguyen /* switch L4 header pointer from outer to inner */ 1756a4e82a81STony Nguyen l4.hdr = skb_inner_transport_header(skb); 1757a4e82a81STony Nguyen l4_proto = 0; 1758a4e82a81STony Nguyen 1759a4e82a81STony Nguyen /* reset type as we transition from outer to inner headers */ 1760a4e82a81STony Nguyen first->tx_flags &= ~(ICE_TX_FLAGS_IPV4 | ICE_TX_FLAGS_IPV6); 1761a4e82a81STony Nguyen if (ip.v4->version == 4) 1762a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_IPV4; 1763a4e82a81STony Nguyen if (ip.v6->version == 6) 1764a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_IPV6; 1765a4e82a81STony Nguyen } 1766a4e82a81STony Nguyen 1767d76a60baSAnirudh Venkataramanan /* Enable IP checksum offloads */ 1768a4e82a81STony Nguyen if (first->tx_flags & ICE_TX_FLAGS_IPV4) { 1769d76a60baSAnirudh Venkataramanan l4_proto = ip.v4->protocol; 1770d76a60baSAnirudh Venkataramanan /* the stack computes the IP header already, the only time we 1771d76a60baSAnirudh Venkataramanan * need the hardware to recompute it is in the case of TSO. 1772d76a60baSAnirudh Venkataramanan */ 1773d76a60baSAnirudh Venkataramanan if (first->tx_flags & ICE_TX_FLAGS_TSO) 1774d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_IIPT_IPV4_CSUM; 1775d76a60baSAnirudh Venkataramanan else 1776d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_IIPT_IPV4; 1777d76a60baSAnirudh Venkataramanan 1778a4e82a81STony Nguyen } else if (first->tx_flags & ICE_TX_FLAGS_IPV6) { 1779d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_IIPT_IPV6; 1780d76a60baSAnirudh Venkataramanan exthdr = ip.hdr + sizeof(*ip.v6); 1781d76a60baSAnirudh Venkataramanan l4_proto = ip.v6->nexthdr; 1782d76a60baSAnirudh Venkataramanan if (l4.hdr != exthdr) 1783d76a60baSAnirudh Venkataramanan ipv6_skip_exthdr(skb, exthdr - skb->data, &l4_proto, 1784d76a60baSAnirudh Venkataramanan &frag_off); 1785d76a60baSAnirudh Venkataramanan } else { 1786d76a60baSAnirudh Venkataramanan return -1; 1787d76a60baSAnirudh Venkataramanan } 1788d76a60baSAnirudh Venkataramanan 1789d76a60baSAnirudh Venkataramanan /* compute inner L3 header size */ 1790d76a60baSAnirudh Venkataramanan l3_len = l4.hdr - ip.hdr; 1791d76a60baSAnirudh Venkataramanan offset |= (l3_len / 4) << ICE_TX_DESC_LEN_IPLEN_S; 1792d76a60baSAnirudh Venkataramanan 1793d76a60baSAnirudh Venkataramanan /* Enable L4 checksum offloads */ 1794d76a60baSAnirudh Venkataramanan switch (l4_proto) { 1795d76a60baSAnirudh Venkataramanan case IPPROTO_TCP: 1796d76a60baSAnirudh Venkataramanan /* enable checksum offloads */ 1797d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_L4T_EOFT_TCP; 1798d76a60baSAnirudh Venkataramanan l4_len = l4.tcp->doff; 1799d76a60baSAnirudh Venkataramanan offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S; 1800d76a60baSAnirudh Venkataramanan break; 1801d76a60baSAnirudh Venkataramanan case IPPROTO_UDP: 1802d76a60baSAnirudh Venkataramanan /* enable UDP checksum offload */ 1803d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_L4T_EOFT_UDP; 1804d76a60baSAnirudh Venkataramanan l4_len = (sizeof(struct udphdr) >> 2); 1805d76a60baSAnirudh Venkataramanan offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S; 1806d76a60baSAnirudh Venkataramanan break; 1807d76a60baSAnirudh Venkataramanan case IPPROTO_SCTP: 1808cf909e19SAnirudh Venkataramanan /* enable SCTP checksum offload */ 1809cf909e19SAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_L4T_EOFT_SCTP; 1810cf909e19SAnirudh Venkataramanan l4_len = sizeof(struct sctphdr) >> 2; 1811cf909e19SAnirudh Venkataramanan offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S; 1812cf909e19SAnirudh Venkataramanan break; 1813cf909e19SAnirudh Venkataramanan 1814d76a60baSAnirudh Venkataramanan default: 1815d76a60baSAnirudh Venkataramanan if (first->tx_flags & ICE_TX_FLAGS_TSO) 1816d76a60baSAnirudh Venkataramanan return -1; 1817d76a60baSAnirudh Venkataramanan skb_checksum_help(skb); 1818d76a60baSAnirudh Venkataramanan return 0; 1819d76a60baSAnirudh Venkataramanan } 1820d76a60baSAnirudh Venkataramanan 1821d76a60baSAnirudh Venkataramanan off->td_cmd |= cmd; 1822d76a60baSAnirudh Venkataramanan off->td_offset |= offset; 1823d76a60baSAnirudh Venkataramanan return 1; 1824d76a60baSAnirudh Venkataramanan } 1825d76a60baSAnirudh Venkataramanan 1826d76a60baSAnirudh Venkataramanan /** 1827f9867df6SAnirudh Venkataramanan * ice_tx_prepare_vlan_flags - prepare generic Tx VLAN tagging flags for HW 1828d76a60baSAnirudh Venkataramanan * @tx_ring: ring to send buffer on 1829d76a60baSAnirudh Venkataramanan * @first: pointer to struct ice_tx_buf 1830d76a60baSAnirudh Venkataramanan * 1831d76a60baSAnirudh Venkataramanan * Checks the skb and set up correspondingly several generic transmit flags 1832d76a60baSAnirudh Venkataramanan * related to VLAN tagging for the HW, such as VLAN, DCB, etc. 1833d76a60baSAnirudh Venkataramanan */ 18342bb19d6eSBrett Creeley static void 1835d76a60baSAnirudh Venkataramanan ice_tx_prepare_vlan_flags(struct ice_ring *tx_ring, struct ice_tx_buf *first) 1836d76a60baSAnirudh Venkataramanan { 1837d76a60baSAnirudh Venkataramanan struct sk_buff *skb = first->skb; 1838d76a60baSAnirudh Venkataramanan 18392bb19d6eSBrett Creeley /* nothing left to do, software offloaded VLAN */ 18402bb19d6eSBrett Creeley if (!skb_vlan_tag_present(skb) && eth_type_vlan(skb->protocol)) 18412bb19d6eSBrett Creeley return; 18422bb19d6eSBrett Creeley 18432bb19d6eSBrett Creeley /* currently, we always assume 802.1Q for VLAN insertion as VLAN 18442bb19d6eSBrett Creeley * insertion for 802.1AD is not supported 1845d76a60baSAnirudh Venkataramanan */ 1846d76a60baSAnirudh Venkataramanan if (skb_vlan_tag_present(skb)) { 1847d76a60baSAnirudh Venkataramanan first->tx_flags |= skb_vlan_tag_get(skb) << ICE_TX_FLAGS_VLAN_S; 1848d76a60baSAnirudh Venkataramanan first->tx_flags |= ICE_TX_FLAGS_HW_VLAN; 1849d76a60baSAnirudh Venkataramanan } 1850d76a60baSAnirudh Venkataramanan 18512bb19d6eSBrett Creeley ice_tx_prepare_vlan_flags_dcb(tx_ring, first); 1852d76a60baSAnirudh Venkataramanan } 1853d76a60baSAnirudh Venkataramanan 1854d76a60baSAnirudh Venkataramanan /** 1855d76a60baSAnirudh Venkataramanan * ice_tso - computes mss and TSO length to prepare for TSO 1856d76a60baSAnirudh Venkataramanan * @first: pointer to struct ice_tx_buf 1857d76a60baSAnirudh Venkataramanan * @off: pointer to struct that holds offload parameters 1858d76a60baSAnirudh Venkataramanan * 1859d76a60baSAnirudh Venkataramanan * Returns 0 or error (negative) if TSO can't happen, 1 otherwise. 1860d76a60baSAnirudh Venkataramanan */ 1861d76a60baSAnirudh Venkataramanan static 1862d76a60baSAnirudh Venkataramanan int ice_tso(struct ice_tx_buf *first, struct ice_tx_offload_params *off) 1863d76a60baSAnirudh Venkataramanan { 1864d76a60baSAnirudh Venkataramanan struct sk_buff *skb = first->skb; 1865d76a60baSAnirudh Venkataramanan union { 1866d76a60baSAnirudh Venkataramanan struct iphdr *v4; 1867d76a60baSAnirudh Venkataramanan struct ipv6hdr *v6; 1868d76a60baSAnirudh Venkataramanan unsigned char *hdr; 1869d76a60baSAnirudh Venkataramanan } ip; 1870d76a60baSAnirudh Venkataramanan union { 1871d76a60baSAnirudh Venkataramanan struct tcphdr *tcp; 1872a54e3b8cSBrett Creeley struct udphdr *udp; 1873d76a60baSAnirudh Venkataramanan unsigned char *hdr; 1874d76a60baSAnirudh Venkataramanan } l4; 1875d76a60baSAnirudh Venkataramanan u64 cd_mss, cd_tso_len; 187688865fc4SKarol Kolacinski u32 paylen; 187788865fc4SKarol Kolacinski u8 l4_start; 1878d76a60baSAnirudh Venkataramanan int err; 1879d76a60baSAnirudh Venkataramanan 1880d76a60baSAnirudh Venkataramanan if (skb->ip_summed != CHECKSUM_PARTIAL) 1881d76a60baSAnirudh Venkataramanan return 0; 1882d76a60baSAnirudh Venkataramanan 1883d76a60baSAnirudh Venkataramanan if (!skb_is_gso(skb)) 1884d76a60baSAnirudh Venkataramanan return 0; 1885d76a60baSAnirudh Venkataramanan 1886d76a60baSAnirudh Venkataramanan err = skb_cow_head(skb, 0); 1887d76a60baSAnirudh Venkataramanan if (err < 0) 1888d76a60baSAnirudh Venkataramanan return err; 1889d76a60baSAnirudh Venkataramanan 1890c3a6825eSBruce Allan /* cppcheck-suppress unreadVariable */ 1891d76a60baSAnirudh Venkataramanan ip.hdr = skb_network_header(skb); 1892d76a60baSAnirudh Venkataramanan l4.hdr = skb_transport_header(skb); 1893d76a60baSAnirudh Venkataramanan 1894d76a60baSAnirudh Venkataramanan /* initialize outer IP header fields */ 1895d76a60baSAnirudh Venkataramanan if (ip.v4->version == 4) { 1896d76a60baSAnirudh Venkataramanan ip.v4->tot_len = 0; 1897d76a60baSAnirudh Venkataramanan ip.v4->check = 0; 1898d76a60baSAnirudh Venkataramanan } else { 1899d76a60baSAnirudh Venkataramanan ip.v6->payload_len = 0; 1900d76a60baSAnirudh Venkataramanan } 1901d76a60baSAnirudh Venkataramanan 1902a4e82a81STony Nguyen if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE | 1903a4e82a81STony Nguyen SKB_GSO_GRE_CSUM | 1904a4e82a81STony Nguyen SKB_GSO_IPXIP4 | 1905a4e82a81STony Nguyen SKB_GSO_IPXIP6 | 1906a4e82a81STony Nguyen SKB_GSO_UDP_TUNNEL | 1907a4e82a81STony Nguyen SKB_GSO_UDP_TUNNEL_CSUM)) { 1908a4e82a81STony Nguyen if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) && 1909a4e82a81STony Nguyen (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) { 1910a4e82a81STony Nguyen l4.udp->len = 0; 1911a4e82a81STony Nguyen 1912a4e82a81STony Nguyen /* determine offset of outer transport header */ 191388865fc4SKarol Kolacinski l4_start = (u8)(l4.hdr - skb->data); 1914a4e82a81STony Nguyen 1915a4e82a81STony Nguyen /* remove payload length from outer checksum */ 1916a4e82a81STony Nguyen paylen = skb->len - l4_start; 1917a4e82a81STony Nguyen csum_replace_by_diff(&l4.udp->check, 1918a4e82a81STony Nguyen (__force __wsum)htonl(paylen)); 1919a4e82a81STony Nguyen } 1920a4e82a81STony Nguyen 1921a4e82a81STony Nguyen /* reset pointers to inner headers */ 1922a4e82a81STony Nguyen 1923a4e82a81STony Nguyen /* cppcheck-suppress unreadVariable */ 1924a4e82a81STony Nguyen ip.hdr = skb_inner_network_header(skb); 1925a4e82a81STony Nguyen l4.hdr = skb_inner_transport_header(skb); 1926a4e82a81STony Nguyen 1927a4e82a81STony Nguyen /* initialize inner IP header fields */ 1928a4e82a81STony Nguyen if (ip.v4->version == 4) { 1929a4e82a81STony Nguyen ip.v4->tot_len = 0; 1930a4e82a81STony Nguyen ip.v4->check = 0; 1931a4e82a81STony Nguyen } else { 1932a4e82a81STony Nguyen ip.v6->payload_len = 0; 1933a4e82a81STony Nguyen } 1934a4e82a81STony Nguyen } 1935a4e82a81STony Nguyen 1936d76a60baSAnirudh Venkataramanan /* determine offset of transport header */ 193788865fc4SKarol Kolacinski l4_start = (u8)(l4.hdr - skb->data); 1938d76a60baSAnirudh Venkataramanan 1939d76a60baSAnirudh Venkataramanan /* remove payload length from checksum */ 1940d76a60baSAnirudh Venkataramanan paylen = skb->len - l4_start; 1941d76a60baSAnirudh Venkataramanan 1942a54e3b8cSBrett Creeley if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) { 1943a54e3b8cSBrett Creeley csum_replace_by_diff(&l4.udp->check, 1944a54e3b8cSBrett Creeley (__force __wsum)htonl(paylen)); 1945a54e3b8cSBrett Creeley /* compute length of UDP segmentation header */ 194688865fc4SKarol Kolacinski off->header_len = (u8)sizeof(l4.udp) + l4_start; 1947a54e3b8cSBrett Creeley } else { 1948a54e3b8cSBrett Creeley csum_replace_by_diff(&l4.tcp->check, 1949a54e3b8cSBrett Creeley (__force __wsum)htonl(paylen)); 1950a54e3b8cSBrett Creeley /* compute length of TCP segmentation header */ 195188865fc4SKarol Kolacinski off->header_len = (u8)((l4.tcp->doff * 4) + l4_start); 1952a54e3b8cSBrett Creeley } 1953d76a60baSAnirudh Venkataramanan 1954d76a60baSAnirudh Venkataramanan /* update gso_segs and bytecount */ 1955d76a60baSAnirudh Venkataramanan first->gso_segs = skb_shinfo(skb)->gso_segs; 1956d944b469SBrett Creeley first->bytecount += (first->gso_segs - 1) * off->header_len; 1957d76a60baSAnirudh Venkataramanan 1958d76a60baSAnirudh Venkataramanan cd_tso_len = skb->len - off->header_len; 1959d76a60baSAnirudh Venkataramanan cd_mss = skb_shinfo(skb)->gso_size; 1960d76a60baSAnirudh Venkataramanan 1961d76a60baSAnirudh Venkataramanan /* record cdesc_qw1 with TSO parameters */ 1962e65e9e15SBruce Allan off->cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX | 1963d76a60baSAnirudh Venkataramanan (ICE_TX_CTX_DESC_TSO << ICE_TXD_CTX_QW1_CMD_S) | 1964d76a60baSAnirudh Venkataramanan (cd_tso_len << ICE_TXD_CTX_QW1_TSO_LEN_S) | 1965e65e9e15SBruce Allan (cd_mss << ICE_TXD_CTX_QW1_MSS_S)); 1966d76a60baSAnirudh Venkataramanan first->tx_flags |= ICE_TX_FLAGS_TSO; 1967d76a60baSAnirudh Venkataramanan return 1; 1968d76a60baSAnirudh Venkataramanan } 1969d76a60baSAnirudh Venkataramanan 1970d76a60baSAnirudh Venkataramanan /** 19712b245cb2SAnirudh Venkataramanan * ice_txd_use_count - estimate the number of descriptors needed for Tx 19722b245cb2SAnirudh Venkataramanan * @size: transmit request size in bytes 19732b245cb2SAnirudh Venkataramanan * 19742b245cb2SAnirudh Venkataramanan * Due to hardware alignment restrictions (4K alignment), we need to 19752b245cb2SAnirudh Venkataramanan * assume that we can have no more than 12K of data per descriptor, even 19762b245cb2SAnirudh Venkataramanan * though each descriptor can take up to 16K - 1 bytes of aligned memory. 19772b245cb2SAnirudh Venkataramanan * Thus, we need to divide by 12K. But division is slow! Instead, 19782b245cb2SAnirudh Venkataramanan * we decompose the operation into shifts and one relatively cheap 19792b245cb2SAnirudh Venkataramanan * multiply operation. 19802b245cb2SAnirudh Venkataramanan * 19812b245cb2SAnirudh Venkataramanan * To divide by 12K, we first divide by 4K, then divide by 3: 19822b245cb2SAnirudh Venkataramanan * To divide by 4K, shift right by 12 bits 19832b245cb2SAnirudh Venkataramanan * To divide by 3, multiply by 85, then divide by 256 19842b245cb2SAnirudh Venkataramanan * (Divide by 256 is done by shifting right by 8 bits) 19852b245cb2SAnirudh Venkataramanan * Finally, we add one to round up. Because 256 isn't an exact multiple of 19862b245cb2SAnirudh Venkataramanan * 3, we'll underestimate near each multiple of 12K. This is actually more 19872b245cb2SAnirudh Venkataramanan * accurate as we have 4K - 1 of wiggle room that we can fit into the last 19882b245cb2SAnirudh Venkataramanan * segment. For our purposes this is accurate out to 1M which is orders of 19892b245cb2SAnirudh Venkataramanan * magnitude greater than our largest possible GSO size. 19902b245cb2SAnirudh Venkataramanan * 19912b245cb2SAnirudh Venkataramanan * This would then be implemented as: 1992c585ea42SBrett Creeley * return (((size >> 12) * 85) >> 8) + ICE_DESCS_FOR_SKB_DATA_PTR; 19932b245cb2SAnirudh Venkataramanan * 19942b245cb2SAnirudh Venkataramanan * Since multiplication and division are commutative, we can reorder 19952b245cb2SAnirudh Venkataramanan * operations into: 1996c585ea42SBrett Creeley * return ((size * 85) >> 20) + ICE_DESCS_FOR_SKB_DATA_PTR; 19972b245cb2SAnirudh Venkataramanan */ 19982b245cb2SAnirudh Venkataramanan static unsigned int ice_txd_use_count(unsigned int size) 19992b245cb2SAnirudh Venkataramanan { 2000c585ea42SBrett Creeley return ((size * 85) >> 20) + ICE_DESCS_FOR_SKB_DATA_PTR; 20012b245cb2SAnirudh Venkataramanan } 20022b245cb2SAnirudh Venkataramanan 20032b245cb2SAnirudh Venkataramanan /** 2004d337f2afSAnirudh Venkataramanan * ice_xmit_desc_count - calculate number of Tx descriptors needed 20052b245cb2SAnirudh Venkataramanan * @skb: send buffer 20062b245cb2SAnirudh Venkataramanan * 20072b245cb2SAnirudh Venkataramanan * Returns number of data descriptors needed for this skb. 20082b245cb2SAnirudh Venkataramanan */ 20092b245cb2SAnirudh Venkataramanan static unsigned int ice_xmit_desc_count(struct sk_buff *skb) 20102b245cb2SAnirudh Venkataramanan { 2011d7840976SMatthew Wilcox (Oracle) const skb_frag_t *frag = &skb_shinfo(skb)->frags[0]; 20122b245cb2SAnirudh Venkataramanan unsigned int nr_frags = skb_shinfo(skb)->nr_frags; 20132b245cb2SAnirudh Venkataramanan unsigned int count = 0, size = skb_headlen(skb); 20142b245cb2SAnirudh Venkataramanan 20152b245cb2SAnirudh Venkataramanan for (;;) { 20162b245cb2SAnirudh Venkataramanan count += ice_txd_use_count(size); 20172b245cb2SAnirudh Venkataramanan 20182b245cb2SAnirudh Venkataramanan if (!nr_frags--) 20192b245cb2SAnirudh Venkataramanan break; 20202b245cb2SAnirudh Venkataramanan 20212b245cb2SAnirudh Venkataramanan size = skb_frag_size(frag++); 20222b245cb2SAnirudh Venkataramanan } 20232b245cb2SAnirudh Venkataramanan 20242b245cb2SAnirudh Venkataramanan return count; 20252b245cb2SAnirudh Venkataramanan } 20262b245cb2SAnirudh Venkataramanan 20272b245cb2SAnirudh Venkataramanan /** 20282b245cb2SAnirudh Venkataramanan * __ice_chk_linearize - Check if there are more than 8 buffers per packet 20292b245cb2SAnirudh Venkataramanan * @skb: send buffer 20302b245cb2SAnirudh Venkataramanan * 20312b245cb2SAnirudh Venkataramanan * Note: This HW can't DMA more than 8 buffers to build a packet on the wire 20322b245cb2SAnirudh Venkataramanan * and so we need to figure out the cases where we need to linearize the skb. 20332b245cb2SAnirudh Venkataramanan * 20342b245cb2SAnirudh Venkataramanan * For TSO we need to count the TSO header and segment payload separately. 20352b245cb2SAnirudh Venkataramanan * As such we need to check cases where we have 7 fragments or more as we 20362b245cb2SAnirudh Venkataramanan * can potentially require 9 DMA transactions, 1 for the TSO header, 1 for 20372b245cb2SAnirudh Venkataramanan * the segment payload in the first descriptor, and another 7 for the 20382b245cb2SAnirudh Venkataramanan * fragments. 20392b245cb2SAnirudh Venkataramanan */ 20402b245cb2SAnirudh Venkataramanan static bool __ice_chk_linearize(struct sk_buff *skb) 20412b245cb2SAnirudh Venkataramanan { 2042d7840976SMatthew Wilcox (Oracle) const skb_frag_t *frag, *stale; 20432b245cb2SAnirudh Venkataramanan int nr_frags, sum; 20442b245cb2SAnirudh Venkataramanan 20452b245cb2SAnirudh Venkataramanan /* no need to check if number of frags is less than 7 */ 20462b245cb2SAnirudh Venkataramanan nr_frags = skb_shinfo(skb)->nr_frags; 20472b245cb2SAnirudh Venkataramanan if (nr_frags < (ICE_MAX_BUF_TXD - 1)) 20482b245cb2SAnirudh Venkataramanan return false; 20492b245cb2SAnirudh Venkataramanan 20502b245cb2SAnirudh Venkataramanan /* We need to walk through the list and validate that each group 20512b245cb2SAnirudh Venkataramanan * of 6 fragments totals at least gso_size. 20522b245cb2SAnirudh Venkataramanan */ 20532b245cb2SAnirudh Venkataramanan nr_frags -= ICE_MAX_BUF_TXD - 2; 20542b245cb2SAnirudh Venkataramanan frag = &skb_shinfo(skb)->frags[0]; 20552b245cb2SAnirudh Venkataramanan 20562b245cb2SAnirudh Venkataramanan /* Initialize size to the negative value of gso_size minus 1. We 20574ee656bbSTony Nguyen * use this as the worst case scenario in which the frag ahead 20582b245cb2SAnirudh Venkataramanan * of us only provides one byte which is why we are limited to 6 20592b245cb2SAnirudh Venkataramanan * descriptors for a single transmit as the header and previous 20602b245cb2SAnirudh Venkataramanan * fragment are already consuming 2 descriptors. 20612b245cb2SAnirudh Venkataramanan */ 20622b245cb2SAnirudh Venkataramanan sum = 1 - skb_shinfo(skb)->gso_size; 20632b245cb2SAnirudh Venkataramanan 20642b245cb2SAnirudh Venkataramanan /* Add size of frags 0 through 4 to create our initial sum */ 20652b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++); 20662b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++); 20672b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++); 20682b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++); 20692b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++); 20702b245cb2SAnirudh Venkataramanan 20712b245cb2SAnirudh Venkataramanan /* Walk through fragments adding latest fragment, testing it, and 20722b245cb2SAnirudh Venkataramanan * then removing stale fragments from the sum. 20732b245cb2SAnirudh Venkataramanan */ 20740a37abfaSKiran Patil for (stale = &skb_shinfo(skb)->frags[0];; stale++) { 20750a37abfaSKiran Patil int stale_size = skb_frag_size(stale); 20760a37abfaSKiran Patil 20772b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++); 20782b245cb2SAnirudh Venkataramanan 20790a37abfaSKiran Patil /* The stale fragment may present us with a smaller 20800a37abfaSKiran Patil * descriptor than the actual fragment size. To account 20810a37abfaSKiran Patil * for that we need to remove all the data on the front and 20820a37abfaSKiran Patil * figure out what the remainder would be in the last 20830a37abfaSKiran Patil * descriptor associated with the fragment. 20840a37abfaSKiran Patil */ 20850a37abfaSKiran Patil if (stale_size > ICE_MAX_DATA_PER_TXD) { 20860a37abfaSKiran Patil int align_pad = -(skb_frag_off(stale)) & 20870a37abfaSKiran Patil (ICE_MAX_READ_REQ_SIZE - 1); 20880a37abfaSKiran Patil 20890a37abfaSKiran Patil sum -= align_pad; 20900a37abfaSKiran Patil stale_size -= align_pad; 20910a37abfaSKiran Patil 20920a37abfaSKiran Patil do { 20930a37abfaSKiran Patil sum -= ICE_MAX_DATA_PER_TXD_ALIGNED; 20940a37abfaSKiran Patil stale_size -= ICE_MAX_DATA_PER_TXD_ALIGNED; 20950a37abfaSKiran Patil } while (stale_size > ICE_MAX_DATA_PER_TXD); 20960a37abfaSKiran Patil } 20970a37abfaSKiran Patil 20982b245cb2SAnirudh Venkataramanan /* if sum is negative we failed to make sufficient progress */ 20992b245cb2SAnirudh Venkataramanan if (sum < 0) 21002b245cb2SAnirudh Venkataramanan return true; 21012b245cb2SAnirudh Venkataramanan 21022b245cb2SAnirudh Venkataramanan if (!nr_frags--) 21032b245cb2SAnirudh Venkataramanan break; 21042b245cb2SAnirudh Venkataramanan 21050a37abfaSKiran Patil sum -= stale_size; 21062b245cb2SAnirudh Venkataramanan } 21072b245cb2SAnirudh Venkataramanan 21082b245cb2SAnirudh Venkataramanan return false; 21092b245cb2SAnirudh Venkataramanan } 21102b245cb2SAnirudh Venkataramanan 21112b245cb2SAnirudh Venkataramanan /** 21122b245cb2SAnirudh Venkataramanan * ice_chk_linearize - Check if there are more than 8 fragments per packet 21132b245cb2SAnirudh Venkataramanan * @skb: send buffer 21142b245cb2SAnirudh Venkataramanan * @count: number of buffers used 21152b245cb2SAnirudh Venkataramanan * 21162b245cb2SAnirudh Venkataramanan * Note: Our HW can't scatter-gather more than 8 fragments to build 21172b245cb2SAnirudh Venkataramanan * a packet on the wire and so we need to figure out the cases where we 21182b245cb2SAnirudh Venkataramanan * need to linearize the skb. 21192b245cb2SAnirudh Venkataramanan */ 21202b245cb2SAnirudh Venkataramanan static bool ice_chk_linearize(struct sk_buff *skb, unsigned int count) 21212b245cb2SAnirudh Venkataramanan { 21222b245cb2SAnirudh Venkataramanan /* Both TSO and single send will work if count is less than 8 */ 21232b245cb2SAnirudh Venkataramanan if (likely(count < ICE_MAX_BUF_TXD)) 21242b245cb2SAnirudh Venkataramanan return false; 21252b245cb2SAnirudh Venkataramanan 21262b245cb2SAnirudh Venkataramanan if (skb_is_gso(skb)) 21272b245cb2SAnirudh Venkataramanan return __ice_chk_linearize(skb); 21282b245cb2SAnirudh Venkataramanan 21292b245cb2SAnirudh Venkataramanan /* we can support up to 8 data buffers for a single send */ 21302b245cb2SAnirudh Venkataramanan return count != ICE_MAX_BUF_TXD; 21312b245cb2SAnirudh Venkataramanan } 21322b245cb2SAnirudh Venkataramanan 21332b245cb2SAnirudh Venkataramanan /** 21342b245cb2SAnirudh Venkataramanan * ice_xmit_frame_ring - Sends buffer on Tx ring 21352b245cb2SAnirudh Venkataramanan * @skb: send buffer 21362b245cb2SAnirudh Venkataramanan * @tx_ring: ring to send buffer on 21372b245cb2SAnirudh Venkataramanan * 21382b245cb2SAnirudh Venkataramanan * Returns NETDEV_TX_OK if sent, else an error code 21392b245cb2SAnirudh Venkataramanan */ 21402b245cb2SAnirudh Venkataramanan static netdev_tx_t 21412b245cb2SAnirudh Venkataramanan ice_xmit_frame_ring(struct sk_buff *skb, struct ice_ring *tx_ring) 21422b245cb2SAnirudh Venkataramanan { 2143d76a60baSAnirudh Venkataramanan struct ice_tx_offload_params offload = { 0 }; 21440c3a6101SDave Ertman struct ice_vsi *vsi = tx_ring->vsi; 21452b245cb2SAnirudh Venkataramanan struct ice_tx_buf *first; 21462b245cb2SAnirudh Venkataramanan unsigned int count; 2147d76a60baSAnirudh Venkataramanan int tso, csum; 21482b245cb2SAnirudh Venkataramanan 21492b245cb2SAnirudh Venkataramanan count = ice_xmit_desc_count(skb); 21502b245cb2SAnirudh Venkataramanan if (ice_chk_linearize(skb, count)) { 21512b245cb2SAnirudh Venkataramanan if (__skb_linearize(skb)) 21522b245cb2SAnirudh Venkataramanan goto out_drop; 21532b245cb2SAnirudh Venkataramanan count = ice_txd_use_count(skb->len); 21542b245cb2SAnirudh Venkataramanan tx_ring->tx_stats.tx_linearize++; 21552b245cb2SAnirudh Venkataramanan } 21562b245cb2SAnirudh Venkataramanan 21572b245cb2SAnirudh Venkataramanan /* need: 1 descriptor per page * PAGE_SIZE/ICE_MAX_DATA_PER_TXD, 21582b245cb2SAnirudh Venkataramanan * + 1 desc for skb_head_len/ICE_MAX_DATA_PER_TXD, 21592b245cb2SAnirudh Venkataramanan * + 4 desc gap to avoid the cache line where head is, 21602b245cb2SAnirudh Venkataramanan * + 1 desc for context descriptor, 21612b245cb2SAnirudh Venkataramanan * otherwise try next time 21622b245cb2SAnirudh Venkataramanan */ 2163c585ea42SBrett Creeley if (ice_maybe_stop_tx(tx_ring, count + ICE_DESCS_PER_CACHE_LINE + 2164c585ea42SBrett Creeley ICE_DESCS_FOR_CTX_DESC)) { 21652b245cb2SAnirudh Venkataramanan tx_ring->tx_stats.tx_busy++; 21662b245cb2SAnirudh Venkataramanan return NETDEV_TX_BUSY; 21672b245cb2SAnirudh Venkataramanan } 21682b245cb2SAnirudh Venkataramanan 2169d76a60baSAnirudh Venkataramanan offload.tx_ring = tx_ring; 2170d76a60baSAnirudh Venkataramanan 21712b245cb2SAnirudh Venkataramanan /* record the location of the first descriptor for this packet */ 21722b245cb2SAnirudh Venkataramanan first = &tx_ring->tx_buf[tx_ring->next_to_use]; 21732b245cb2SAnirudh Venkataramanan first->skb = skb; 21742b245cb2SAnirudh Venkataramanan first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN); 21752b245cb2SAnirudh Venkataramanan first->gso_segs = 1; 2176d76a60baSAnirudh Venkataramanan first->tx_flags = 0; 21772b245cb2SAnirudh Venkataramanan 2178d76a60baSAnirudh Venkataramanan /* prepare the VLAN tagging flags for Tx */ 21792bb19d6eSBrett Creeley ice_tx_prepare_vlan_flags(tx_ring, first); 2180d76a60baSAnirudh Venkataramanan 2181d76a60baSAnirudh Venkataramanan /* set up TSO offload */ 2182d76a60baSAnirudh Venkataramanan tso = ice_tso(first, &offload); 2183d76a60baSAnirudh Venkataramanan if (tso < 0) 2184d76a60baSAnirudh Venkataramanan goto out_drop; 2185d76a60baSAnirudh Venkataramanan 2186d76a60baSAnirudh Venkataramanan /* always set up Tx checksum offload */ 2187d76a60baSAnirudh Venkataramanan csum = ice_tx_csum(first, &offload); 2188d76a60baSAnirudh Venkataramanan if (csum < 0) 2189d76a60baSAnirudh Venkataramanan goto out_drop; 2190d76a60baSAnirudh Venkataramanan 21910c3a6101SDave Ertman /* allow CONTROL frames egress from main VSI if FW LLDP disabled */ 21920c3a6101SDave Ertman if (unlikely(skb->priority == TC_PRIO_CONTROL && 21930c3a6101SDave Ertman vsi->type == ICE_VSI_PF && 2194fc2d1165SChinh T Cao vsi->port_info->qos_cfg.is_sw_lldp)) 21950c3a6101SDave Ertman offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX | 21960c3a6101SDave Ertman ICE_TX_CTX_DESC_SWTCH_UPLINK << 21970c3a6101SDave Ertman ICE_TXD_CTX_QW1_CMD_S); 21980c3a6101SDave Ertman 21990c3a6101SDave Ertman if (offload.cd_qw1 & ICE_TX_DESC_DTYPE_CTX) { 2200d76a60baSAnirudh Venkataramanan struct ice_tx_ctx_desc *cdesc; 220188865fc4SKarol Kolacinski u16 i = tx_ring->next_to_use; 2202d76a60baSAnirudh Venkataramanan 2203d76a60baSAnirudh Venkataramanan /* grab the next descriptor */ 2204d76a60baSAnirudh Venkataramanan cdesc = ICE_TX_CTX_DESC(tx_ring, i); 2205d76a60baSAnirudh Venkataramanan i++; 2206d76a60baSAnirudh Venkataramanan tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; 2207d76a60baSAnirudh Venkataramanan 2208d76a60baSAnirudh Venkataramanan /* setup context descriptor */ 2209d76a60baSAnirudh Venkataramanan cdesc->tunneling_params = cpu_to_le32(offload.cd_tunnel_params); 2210d76a60baSAnirudh Venkataramanan cdesc->l2tag2 = cpu_to_le16(offload.cd_l2tag2); 2211d76a60baSAnirudh Venkataramanan cdesc->rsvd = cpu_to_le16(0); 2212d76a60baSAnirudh Venkataramanan cdesc->qw1 = cpu_to_le64(offload.cd_qw1); 2213d76a60baSAnirudh Venkataramanan } 2214d76a60baSAnirudh Venkataramanan 2215d76a60baSAnirudh Venkataramanan ice_tx_map(tx_ring, first, &offload); 22162b245cb2SAnirudh Venkataramanan return NETDEV_TX_OK; 22172b245cb2SAnirudh Venkataramanan 22182b245cb2SAnirudh Venkataramanan out_drop: 22192b245cb2SAnirudh Venkataramanan dev_kfree_skb_any(skb); 22202b245cb2SAnirudh Venkataramanan return NETDEV_TX_OK; 22212b245cb2SAnirudh Venkataramanan } 22222b245cb2SAnirudh Venkataramanan 22232b245cb2SAnirudh Venkataramanan /** 22242b245cb2SAnirudh Venkataramanan * ice_start_xmit - Selects the correct VSI and Tx queue to send buffer 22252b245cb2SAnirudh Venkataramanan * @skb: send buffer 22262b245cb2SAnirudh Venkataramanan * @netdev: network interface device structure 22272b245cb2SAnirudh Venkataramanan * 22282b245cb2SAnirudh Venkataramanan * Returns NETDEV_TX_OK if sent, else an error code 22292b245cb2SAnirudh Venkataramanan */ 22302b245cb2SAnirudh Venkataramanan netdev_tx_t ice_start_xmit(struct sk_buff *skb, struct net_device *netdev) 22312b245cb2SAnirudh Venkataramanan { 22322b245cb2SAnirudh Venkataramanan struct ice_netdev_priv *np = netdev_priv(netdev); 22332b245cb2SAnirudh Venkataramanan struct ice_vsi *vsi = np->vsi; 22342b245cb2SAnirudh Venkataramanan struct ice_ring *tx_ring; 22352b245cb2SAnirudh Venkataramanan 22362b245cb2SAnirudh Venkataramanan tx_ring = vsi->tx_rings[skb->queue_mapping]; 22372b245cb2SAnirudh Venkataramanan 22382b245cb2SAnirudh Venkataramanan /* hardware can't handle really short frames, hardware padding works 22392b245cb2SAnirudh Venkataramanan * beyond this point 22402b245cb2SAnirudh Venkataramanan */ 22412b245cb2SAnirudh Venkataramanan if (skb_put_padto(skb, ICE_MIN_TX_LEN)) 22422b245cb2SAnirudh Venkataramanan return NETDEV_TX_OK; 22432b245cb2SAnirudh Venkataramanan 22442b245cb2SAnirudh Venkataramanan return ice_xmit_frame_ring(skb, tx_ring); 22452b245cb2SAnirudh Venkataramanan } 2246148beb61SHenry Tieman 2247148beb61SHenry Tieman /** 2248148beb61SHenry Tieman * ice_clean_ctrl_tx_irq - interrupt handler for flow director Tx queue 2249148beb61SHenry Tieman * @tx_ring: tx_ring to clean 2250148beb61SHenry Tieman */ 2251148beb61SHenry Tieman void ice_clean_ctrl_tx_irq(struct ice_ring *tx_ring) 2252148beb61SHenry Tieman { 2253148beb61SHenry Tieman struct ice_vsi *vsi = tx_ring->vsi; 2254148beb61SHenry Tieman s16 i = tx_ring->next_to_clean; 2255148beb61SHenry Tieman int budget = ICE_DFLT_IRQ_WORK; 2256148beb61SHenry Tieman struct ice_tx_desc *tx_desc; 2257148beb61SHenry Tieman struct ice_tx_buf *tx_buf; 2258148beb61SHenry Tieman 2259148beb61SHenry Tieman tx_buf = &tx_ring->tx_buf[i]; 2260148beb61SHenry Tieman tx_desc = ICE_TX_DESC(tx_ring, i); 2261148beb61SHenry Tieman i -= tx_ring->count; 2262148beb61SHenry Tieman 2263148beb61SHenry Tieman do { 2264148beb61SHenry Tieman struct ice_tx_desc *eop_desc = tx_buf->next_to_watch; 2265148beb61SHenry Tieman 2266148beb61SHenry Tieman /* if next_to_watch is not set then there is no pending work */ 2267148beb61SHenry Tieman if (!eop_desc) 2268148beb61SHenry Tieman break; 2269148beb61SHenry Tieman 2270148beb61SHenry Tieman /* prevent any other reads prior to eop_desc */ 2271148beb61SHenry Tieman smp_rmb(); 2272148beb61SHenry Tieman 2273148beb61SHenry Tieman /* if the descriptor isn't done, no work to do */ 2274148beb61SHenry Tieman if (!(eop_desc->cmd_type_offset_bsz & 2275148beb61SHenry Tieman cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) 2276148beb61SHenry Tieman break; 2277148beb61SHenry Tieman 2278148beb61SHenry Tieman /* clear next_to_watch to prevent false hangs */ 2279148beb61SHenry Tieman tx_buf->next_to_watch = NULL; 2280148beb61SHenry Tieman tx_desc->buf_addr = 0; 2281148beb61SHenry Tieman tx_desc->cmd_type_offset_bsz = 0; 2282148beb61SHenry Tieman 2283148beb61SHenry Tieman /* move past filter desc */ 2284148beb61SHenry Tieman tx_buf++; 2285148beb61SHenry Tieman tx_desc++; 2286148beb61SHenry Tieman i++; 2287148beb61SHenry Tieman if (unlikely(!i)) { 2288148beb61SHenry Tieman i -= tx_ring->count; 2289148beb61SHenry Tieman tx_buf = tx_ring->tx_buf; 2290148beb61SHenry Tieman tx_desc = ICE_TX_DESC(tx_ring, 0); 2291148beb61SHenry Tieman } 2292148beb61SHenry Tieman 2293148beb61SHenry Tieman /* unmap the data header */ 2294148beb61SHenry Tieman if (dma_unmap_len(tx_buf, len)) 2295148beb61SHenry Tieman dma_unmap_single(tx_ring->dev, 2296148beb61SHenry Tieman dma_unmap_addr(tx_buf, dma), 2297148beb61SHenry Tieman dma_unmap_len(tx_buf, len), 2298148beb61SHenry Tieman DMA_TO_DEVICE); 2299148beb61SHenry Tieman if (tx_buf->tx_flags & ICE_TX_FLAGS_DUMMY_PKT) 2300148beb61SHenry Tieman devm_kfree(tx_ring->dev, tx_buf->raw_buf); 2301148beb61SHenry Tieman 2302148beb61SHenry Tieman /* clear next_to_watch to prevent false hangs */ 2303148beb61SHenry Tieman tx_buf->raw_buf = NULL; 2304148beb61SHenry Tieman tx_buf->tx_flags = 0; 2305148beb61SHenry Tieman tx_buf->next_to_watch = NULL; 2306148beb61SHenry Tieman dma_unmap_len_set(tx_buf, len, 0); 2307148beb61SHenry Tieman tx_desc->buf_addr = 0; 2308148beb61SHenry Tieman tx_desc->cmd_type_offset_bsz = 0; 2309148beb61SHenry Tieman 2310148beb61SHenry Tieman /* move past eop_desc for start of next FD desc */ 2311148beb61SHenry Tieman tx_buf++; 2312148beb61SHenry Tieman tx_desc++; 2313148beb61SHenry Tieman i++; 2314148beb61SHenry Tieman if (unlikely(!i)) { 2315148beb61SHenry Tieman i -= tx_ring->count; 2316148beb61SHenry Tieman tx_buf = tx_ring->tx_buf; 2317148beb61SHenry Tieman tx_desc = ICE_TX_DESC(tx_ring, 0); 2318148beb61SHenry Tieman } 2319148beb61SHenry Tieman 2320148beb61SHenry Tieman budget--; 2321148beb61SHenry Tieman } while (likely(budget)); 2322148beb61SHenry Tieman 2323148beb61SHenry Tieman i += tx_ring->count; 2324148beb61SHenry Tieman tx_ring->next_to_clean = i; 2325148beb61SHenry Tieman 2326148beb61SHenry Tieman /* re-enable interrupt if needed */ 2327148beb61SHenry Tieman ice_irq_dynamic_ena(&vsi->back->hw, vsi, vsi->q_vectors[0]); 2328148beb61SHenry Tieman } 2329