// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2019, Intel Corporation. */ #include #include #include #include "ice.h" #include "ice_base.h" #include "ice_type.h" #include "ice_xsk.h" #include "ice_txrx.h" #include "ice_txrx_lib.h" #include "ice_lib.h" static struct xdp_buff **ice_xdp_buf(struct ice_rx_ring *rx_ring, u32 idx) { return &rx_ring->xdp_buf[idx]; } /** * ice_qp_reset_stats - Resets all stats for rings of given index * @vsi: VSI that contains rings of interest * @q_idx: ring index in array */ static void ice_qp_reset_stats(struct ice_vsi *vsi, u16 q_idx) { memset(&vsi->rx_rings[q_idx]->rx_stats, 0, sizeof(vsi->rx_rings[q_idx]->rx_stats)); memset(&vsi->tx_rings[q_idx]->stats, 0, sizeof(vsi->tx_rings[q_idx]->stats)); if (ice_is_xdp_ena_vsi(vsi)) memset(&vsi->xdp_rings[q_idx]->stats, 0, sizeof(vsi->xdp_rings[q_idx]->stats)); } /** * ice_qp_clean_rings - Cleans all the rings of a given index * @vsi: VSI that contains rings of interest * @q_idx: ring index in array */ static void ice_qp_clean_rings(struct ice_vsi *vsi, u16 q_idx) { ice_clean_tx_ring(vsi->tx_rings[q_idx]); if (ice_is_xdp_ena_vsi(vsi)) { synchronize_rcu(); ice_clean_tx_ring(vsi->xdp_rings[q_idx]); } ice_clean_rx_ring(vsi->rx_rings[q_idx]); } /** * ice_qvec_toggle_napi - Enables/disables NAPI for a given q_vector * @vsi: VSI that has netdev * @q_vector: q_vector that has NAPI context * @enable: true for enable, false for disable */ static void ice_qvec_toggle_napi(struct ice_vsi *vsi, struct ice_q_vector *q_vector, bool enable) { if (!vsi->netdev || !q_vector) return; if (enable) napi_enable(&q_vector->napi); else napi_disable(&q_vector->napi); } /** * ice_qvec_dis_irq - Mask off queue interrupt generation on given ring * @vsi: the VSI that contains queue vector being un-configured * @rx_ring: Rx ring that will have its IRQ disabled * @q_vector: queue vector */ static void ice_qvec_dis_irq(struct ice_vsi *vsi, struct ice_rx_ring *rx_ring, struct ice_q_vector *q_vector) { struct ice_pf *pf = vsi->back; struct ice_hw *hw = &pf->hw; int base = vsi->base_vector; u16 reg; u32 val; /* QINT_TQCTL is being cleared in ice_vsi_stop_tx_ring, so handle * here only QINT_RQCTL */ reg = rx_ring->reg_idx; val = rd32(hw, QINT_RQCTL(reg)); val &= ~QINT_RQCTL_CAUSE_ENA_M; wr32(hw, QINT_RQCTL(reg), val); if (q_vector) { u16 v_idx = q_vector->v_idx; wr32(hw, GLINT_DYN_CTL(q_vector->reg_idx), 0); ice_flush(hw); synchronize_irq(pf->msix_entries[v_idx + base].vector); } } /** * ice_qvec_cfg_msix - Enable IRQ for given queue vector * @vsi: the VSI that contains queue vector * @q_vector: queue vector */ static void ice_qvec_cfg_msix(struct ice_vsi *vsi, struct ice_q_vector *q_vector) { u16 reg_idx = q_vector->reg_idx; struct ice_pf *pf = vsi->back; struct ice_hw *hw = &pf->hw; struct ice_tx_ring *tx_ring; struct ice_rx_ring *rx_ring; ice_cfg_itr(hw, q_vector); ice_for_each_tx_ring(tx_ring, q_vector->tx) ice_cfg_txq_interrupt(vsi, tx_ring->reg_idx, reg_idx, q_vector->tx.itr_idx); ice_for_each_rx_ring(rx_ring, q_vector->rx) ice_cfg_rxq_interrupt(vsi, rx_ring->reg_idx, reg_idx, q_vector->rx.itr_idx); ice_flush(hw); } /** * ice_qvec_ena_irq - Enable IRQ for given queue vector * @vsi: the VSI that contains queue vector * @q_vector: queue vector */ static void ice_qvec_ena_irq(struct ice_vsi *vsi, struct ice_q_vector *q_vector) { struct ice_pf *pf = vsi->back; struct ice_hw *hw = &pf->hw; ice_irq_dynamic_ena(hw, vsi, q_vector); ice_flush(hw); } /** * ice_qp_dis - Disables a queue pair * @vsi: VSI of interest * @q_idx: ring index in array * * Returns 0 on success, negative on failure. */ static int ice_qp_dis(struct ice_vsi *vsi, u16 q_idx) { struct ice_txq_meta txq_meta = { }; struct ice_q_vector *q_vector; struct ice_tx_ring *tx_ring; struct ice_rx_ring *rx_ring; int timeout = 50; int err; if (q_idx >= vsi->num_rxq || q_idx >= vsi->num_txq) return -EINVAL; tx_ring = vsi->tx_rings[q_idx]; rx_ring = vsi->rx_rings[q_idx]; q_vector = rx_ring->q_vector; while (test_and_set_bit(ICE_CFG_BUSY, vsi->state)) { timeout--; if (!timeout) return -EBUSY; usleep_range(1000, 2000); } netif_tx_stop_queue(netdev_get_tx_queue(vsi->netdev, q_idx)); ice_qvec_dis_irq(vsi, rx_ring, q_vector); ice_fill_txq_meta(vsi, tx_ring, &txq_meta); err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, tx_ring, &txq_meta); if (err) return err; if (ice_is_xdp_ena_vsi(vsi)) { struct ice_tx_ring *xdp_ring = vsi->xdp_rings[q_idx]; memset(&txq_meta, 0, sizeof(txq_meta)); ice_fill_txq_meta(vsi, xdp_ring, &txq_meta); err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, xdp_ring, &txq_meta); if (err) return err; } err = ice_vsi_ctrl_one_rx_ring(vsi, false, q_idx, true); if (err) return err; ice_clean_rx_ring(rx_ring); ice_qvec_toggle_napi(vsi, q_vector, false); ice_qp_clean_rings(vsi, q_idx); ice_qp_reset_stats(vsi, q_idx); return 0; } /** * ice_qp_ena - Enables a queue pair * @vsi: VSI of interest * @q_idx: ring index in array * * Returns 0 on success, negative on failure. */ static int ice_qp_ena(struct ice_vsi *vsi, u16 q_idx) { struct ice_aqc_add_tx_qgrp *qg_buf; struct ice_q_vector *q_vector; struct ice_tx_ring *tx_ring; struct ice_rx_ring *rx_ring; u16 size; int err; if (q_idx >= vsi->num_rxq || q_idx >= vsi->num_txq) return -EINVAL; size = struct_size(qg_buf, txqs, 1); qg_buf = kzalloc(size, GFP_KERNEL); if (!qg_buf) return -ENOMEM; qg_buf->num_txqs = 1; tx_ring = vsi->tx_rings[q_idx]; rx_ring = vsi->rx_rings[q_idx]; q_vector = rx_ring->q_vector; err = ice_vsi_cfg_txq(vsi, tx_ring, qg_buf); if (err) goto free_buf; if (ice_is_xdp_ena_vsi(vsi)) { struct ice_tx_ring *xdp_ring = vsi->xdp_rings[q_idx]; memset(qg_buf, 0, size); qg_buf->num_txqs = 1; err = ice_vsi_cfg_txq(vsi, xdp_ring, qg_buf); if (err) goto free_buf; ice_set_ring_xdp(xdp_ring); ice_tx_xsk_pool(vsi, q_idx); } err = ice_vsi_cfg_rxq(rx_ring); if (err) goto free_buf; ice_qvec_cfg_msix(vsi, q_vector); err = ice_vsi_ctrl_one_rx_ring(vsi, true, q_idx, true); if (err) goto free_buf; clear_bit(ICE_CFG_BUSY, vsi->state); ice_qvec_toggle_napi(vsi, q_vector, true); ice_qvec_ena_irq(vsi, q_vector); netif_tx_start_queue(netdev_get_tx_queue(vsi->netdev, q_idx)); free_buf: kfree(qg_buf); return err; } /** * ice_xsk_pool_disable - disable a buffer pool region * @vsi: Current VSI * @qid: queue ID * * Returns 0 on success, negative on failure */ static int ice_xsk_pool_disable(struct ice_vsi *vsi, u16 qid) { struct xsk_buff_pool *pool = xsk_get_pool_from_qid(vsi->netdev, qid); if (!pool) return -EINVAL; clear_bit(qid, vsi->af_xdp_zc_qps); xsk_pool_dma_unmap(pool, ICE_RX_DMA_ATTR); return 0; } /** * ice_xsk_pool_enable - enable a buffer pool region * @vsi: Current VSI * @pool: pointer to a requested buffer pool region * @qid: queue ID * * Returns 0 on success, negative on failure */ static int ice_xsk_pool_enable(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid) { int err; if (vsi->type != ICE_VSI_PF) return -EINVAL; if (qid >= vsi->netdev->real_num_rx_queues || qid >= vsi->netdev->real_num_tx_queues) return -EINVAL; err = xsk_pool_dma_map(pool, ice_pf_to_dev(vsi->back), ICE_RX_DMA_ATTR); if (err) return err; set_bit(qid, vsi->af_xdp_zc_qps); return 0; } /** * ice_realloc_rx_xdp_bufs - reallocate for either XSK or normal buffer * @rx_ring: Rx ring * @pool_present: is pool for XSK present * * Try allocating memory and return ENOMEM, if failed to allocate. * If allocation was successful, substitute buffer with allocated one. * Returns 0 on success, negative on failure */ static int ice_realloc_rx_xdp_bufs(struct ice_rx_ring *rx_ring, bool pool_present) { size_t elem_size = pool_present ? sizeof(*rx_ring->xdp_buf) : sizeof(*rx_ring->rx_buf); void *sw_ring = kcalloc(rx_ring->count, elem_size, GFP_KERNEL); if (!sw_ring) return -ENOMEM; if (pool_present) { kfree(rx_ring->rx_buf); rx_ring->rx_buf = NULL; rx_ring->xdp_buf = sw_ring; } else { kfree(rx_ring->xdp_buf); rx_ring->xdp_buf = NULL; rx_ring->rx_buf = sw_ring; } return 0; } /** * ice_realloc_zc_buf - reallocate XDP ZC queue pairs * @vsi: Current VSI * @zc: is zero copy set * * Reallocate buffer for rx_rings that might be used by XSK. * XDP requires more memory, than rx_buf provides. * Returns 0 on success, negative on failure */ int ice_realloc_zc_buf(struct ice_vsi *vsi, bool zc) { struct ice_rx_ring *rx_ring; unsigned long q; for_each_set_bit(q, vsi->af_xdp_zc_qps, max_t(int, vsi->alloc_txq, vsi->alloc_rxq)) { rx_ring = vsi->rx_rings[q]; if (ice_realloc_rx_xdp_bufs(rx_ring, zc)) return -ENOMEM; } return 0; } /** * ice_xsk_pool_setup - enable/disable a buffer pool region depending on its state * @vsi: Current VSI * @pool: buffer pool to enable/associate to a ring, NULL to disable * @qid: queue ID * * Returns 0 on success, negative on failure */ int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid) { bool if_running, pool_present = !!pool; int ret = 0, pool_failure = 0; if (qid >= vsi->num_rxq || qid >= vsi->num_txq) { netdev_err(vsi->netdev, "Please use queue id in scope of combined queues count\n"); pool_failure = -EINVAL; goto failure; } if (!is_power_of_2(vsi->rx_rings[qid]->count) || !is_power_of_2(vsi->tx_rings[qid]->count)) { netdev_err(vsi->netdev, "Please align ring sizes to power of 2\n"); pool_failure = -EINVAL; goto failure; } if_running = netif_running(vsi->netdev) && ice_is_xdp_ena_vsi(vsi); if (if_running) { struct ice_rx_ring *rx_ring = vsi->rx_rings[qid]; ret = ice_qp_dis(vsi, qid); if (ret) { netdev_err(vsi->netdev, "ice_qp_dis error = %d\n", ret); goto xsk_pool_if_up; } ret = ice_realloc_rx_xdp_bufs(rx_ring, pool_present); if (ret) goto xsk_pool_if_up; } pool_failure = pool_present ? ice_xsk_pool_enable(vsi, pool, qid) : ice_xsk_pool_disable(vsi, qid); xsk_pool_if_up: if (if_running) { ret = ice_qp_ena(vsi, qid); if (!ret && pool_present) napi_schedule(&vsi->rx_rings[qid]->xdp_ring->q_vector->napi); else if (ret) netdev_err(vsi->netdev, "ice_qp_ena error = %d\n", ret); } failure: if (pool_failure) { netdev_err(vsi->netdev, "Could not %sable buffer pool, error = %d\n", pool_present ? "en" : "dis", pool_failure); return pool_failure; } return ret; } /** * ice_fill_rx_descs - pick buffers from XSK buffer pool and use it * @pool: XSK Buffer pool to pull the buffers from * @xdp: SW ring of xdp_buff that will hold the buffers * @rx_desc: Pointer to Rx descriptors that will be filled * @count: The number of buffers to allocate * * This function allocates a number of Rx buffers from the fill ring * or the internal recycle mechanism and places them on the Rx ring. * * Note that ring wrap should be handled by caller of this function. * * Returns the amount of allocated Rx descriptors */ static u16 ice_fill_rx_descs(struct xsk_buff_pool *pool, struct xdp_buff **xdp, union ice_32b_rx_flex_desc *rx_desc, u16 count) { dma_addr_t dma; u16 buffs; int i; buffs = xsk_buff_alloc_batch(pool, xdp, count); for (i = 0; i < buffs; i++) { dma = xsk_buff_xdp_get_dma(*xdp); rx_desc->read.pkt_addr = cpu_to_le64(dma); rx_desc->wb.status_error0 = 0; rx_desc++; xdp++; } return buffs; } /** * __ice_alloc_rx_bufs_zc - allocate a number of Rx buffers * @rx_ring: Rx ring * @count: The number of buffers to allocate * * Place the @count of descriptors onto Rx ring. Handle the ring wrap * for case where space from next_to_use up to the end of ring is less * than @count. Finally do a tail bump. * * Returns true if all allocations were successful, false if any fail. */ static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count) { u32 nb_buffs_extra = 0, nb_buffs = 0; union ice_32b_rx_flex_desc *rx_desc; u16 ntu = rx_ring->next_to_use; u16 total_count = count; struct xdp_buff **xdp; rx_desc = ICE_RX_DESC(rx_ring, ntu); xdp = ice_xdp_buf(rx_ring, ntu); if (ntu + count >= rx_ring->count) { nb_buffs_extra = ice_fill_rx_descs(rx_ring->xsk_pool, xdp, rx_desc, rx_ring->count - ntu); if (nb_buffs_extra != rx_ring->count - ntu) { ntu += nb_buffs_extra; goto exit; } rx_desc = ICE_RX_DESC(rx_ring, 0); xdp = ice_xdp_buf(rx_ring, 0); ntu = 0; count -= nb_buffs_extra; ice_release_rx_desc(rx_ring, 0); } nb_buffs = ice_fill_rx_descs(rx_ring->xsk_pool, xdp, rx_desc, count); ntu += nb_buffs; if (ntu == rx_ring->count) ntu = 0; exit: if (rx_ring->next_to_use != ntu) ice_release_rx_desc(rx_ring, ntu); return total_count == (nb_buffs_extra + nb_buffs); } /** * ice_alloc_rx_bufs_zc - allocate a number of Rx buffers * @rx_ring: Rx ring * @count: The number of buffers to allocate * * Wrapper for internal allocation routine; figure out how many tail * bumps should take place based on the given threshold * * Returns true if all calls to internal alloc routine succeeded */ bool ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count) { u16 rx_thresh = ICE_RING_QUARTER(rx_ring); u16 batched, leftover, i, tail_bumps; batched = ALIGN_DOWN(count, rx_thresh); tail_bumps = batched / rx_thresh; leftover = count & (rx_thresh - 1); for (i = 0; i < tail_bumps; i++) if (!__ice_alloc_rx_bufs_zc(rx_ring, rx_thresh)) return false; return __ice_alloc_rx_bufs_zc(rx_ring, leftover); } /** * ice_bump_ntc - Bump the next_to_clean counter of an Rx ring * @rx_ring: Rx ring */ static void ice_bump_ntc(struct ice_rx_ring *rx_ring) { int ntc = rx_ring->next_to_clean + 1; ntc = (ntc < rx_ring->count) ? ntc : 0; rx_ring->next_to_clean = ntc; prefetch(ICE_RX_DESC(rx_ring, ntc)); } /** * ice_construct_skb_zc - Create an sk_buff from zero-copy buffer * @rx_ring: Rx ring * @xdp: Pointer to XDP buffer * * This function allocates a new skb from a zero-copy Rx buffer. * * Returns the skb on success, NULL on failure. */ static struct sk_buff * ice_construct_skb_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp) { unsigned int totalsize = xdp->data_end - xdp->data_meta; unsigned int metasize = xdp->data - xdp->data_meta; struct sk_buff *skb; net_prefetch(xdp->data_meta); skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize, GFP_ATOMIC | __GFP_NOWARN); if (unlikely(!skb)) return NULL; memcpy(__skb_put(skb, totalsize), xdp->data_meta, ALIGN(totalsize, sizeof(long))); if (metasize) { skb_metadata_set(skb, metasize); __skb_pull(skb, metasize); } xsk_buff_free(xdp); return skb; } /** * ice_run_xdp_zc - Executes an XDP program in zero-copy path * @rx_ring: Rx ring * @xdp: xdp_buff used as input to the XDP program * @xdp_prog: XDP program to run * @xdp_ring: ring to be used for XDP_TX action * * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR} */ static int ice_run_xdp_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp, struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring) { int err, result = ICE_XDP_PASS; u32 act; act = bpf_prog_run_xdp(xdp_prog, xdp); if (likely(act == XDP_REDIRECT)) { err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog); if (!err) return ICE_XDP_REDIR; if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS) result = ICE_XDP_EXIT; else result = ICE_XDP_CONSUMED; goto out_failure; } switch (act) { case XDP_PASS: break; case XDP_TX: result = ice_xmit_xdp_buff(xdp, xdp_ring); if (result == ICE_XDP_CONSUMED) goto out_failure; break; case XDP_DROP: result = ICE_XDP_CONSUMED; break; default: bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act); fallthrough; case XDP_ABORTED: result = ICE_XDP_CONSUMED; out_failure: trace_xdp_exception(rx_ring->netdev, xdp_prog, act); break; } return result; } /** * ice_clean_rx_irq_zc - consumes packets from the hardware ring * @rx_ring: AF_XDP Rx ring * @budget: NAPI budget * * Returns number of processed packets on success, remaining budget on failure. */ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget) { unsigned int total_rx_bytes = 0, total_rx_packets = 0; struct ice_tx_ring *xdp_ring; unsigned int xdp_xmit = 0; struct bpf_prog *xdp_prog; bool failure = false; int entries_to_alloc; /* ZC patch is enabled only when XDP program is set, * so here it can not be NULL */ xdp_prog = READ_ONCE(rx_ring->xdp_prog); xdp_ring = rx_ring->xdp_ring; while (likely(total_rx_packets < (unsigned int)budget)) { union ice_32b_rx_flex_desc *rx_desc; unsigned int size, xdp_res = 0; struct xdp_buff *xdp; struct sk_buff *skb; u16 stat_err_bits; u16 vlan_tag = 0; u16 rx_ptype; rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean); stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S); if (!ice_test_staterr(rx_desc->wb.status_error0, stat_err_bits)) break; /* This memory barrier is needed to keep us from reading * any other fields out of the rx_desc until we have * verified the descriptor has been written back. */ dma_rmb(); if (unlikely(rx_ring->next_to_clean == rx_ring->next_to_use)) break; xdp = *ice_xdp_buf(rx_ring, rx_ring->next_to_clean); size = le16_to_cpu(rx_desc->wb.pkt_len) & ICE_RX_FLX_DESC_PKT_LEN_M; if (!size) { xdp->data = NULL; xdp->data_end = NULL; xdp->data_hard_start = NULL; xdp->data_meta = NULL; goto construct_skb; } xsk_buff_set_size(xdp, size); xsk_buff_dma_sync_for_cpu(xdp, rx_ring->xsk_pool); xdp_res = ice_run_xdp_zc(rx_ring, xdp, xdp_prog, xdp_ring); if (likely(xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR))) { xdp_xmit |= xdp_res; } else if (xdp_res == ICE_XDP_EXIT) { failure = true; break; } else if (xdp_res == ICE_XDP_CONSUMED) { xsk_buff_free(xdp); } else if (xdp_res == ICE_XDP_PASS) { goto construct_skb; } total_rx_bytes += size; total_rx_packets++; ice_bump_ntc(rx_ring); continue; construct_skb: /* XDP_PASS path */ skb = ice_construct_skb_zc(rx_ring, xdp); if (!skb) { rx_ring->rx_stats.alloc_buf_failed++; break; } ice_bump_ntc(rx_ring); if (eth_skb_pad(skb)) { skb = NULL; continue; } total_rx_bytes += skb->len; total_rx_packets++; vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc); rx_ptype = le16_to_cpu(rx_desc->wb.ptype_flex_flags0) & ICE_RX_FLEX_DESC_PTYPE_M; ice_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype); ice_receive_skb(rx_ring, skb, vlan_tag); } entries_to_alloc = ICE_DESC_UNUSED(rx_ring); if (entries_to_alloc > ICE_RING_QUARTER(rx_ring)) failure |= !ice_alloc_rx_bufs_zc(rx_ring, entries_to_alloc); ice_finalize_xdp_rx(xdp_ring, xdp_xmit); ice_update_rx_ring_stats(rx_ring, total_rx_packets, total_rx_bytes); if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) { if (failure || rx_ring->next_to_clean == rx_ring->next_to_use) xsk_set_rx_need_wakeup(rx_ring->xsk_pool); else xsk_clear_rx_need_wakeup(rx_ring->xsk_pool); return (int)total_rx_packets; } return failure ? budget : (int)total_rx_packets; } /** * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer * @xdp_ring: XDP Tx ring * @tx_buf: Tx buffer to clean */ static void ice_clean_xdp_tx_buf(struct ice_tx_ring *xdp_ring, struct ice_tx_buf *tx_buf) { xdp_return_frame((struct xdp_frame *)tx_buf->raw_buf); xdp_ring->xdp_tx_active--; dma_unmap_single(xdp_ring->dev, dma_unmap_addr(tx_buf, dma), dma_unmap_len(tx_buf, len), DMA_TO_DEVICE); dma_unmap_len_set(tx_buf, len, 0); } /** * ice_clean_xdp_irq_zc - Reclaim resources after transmit completes on XDP ring * @xdp_ring: XDP ring to clean * @napi_budget: amount of descriptors that NAPI allows us to clean * * Returns count of cleaned descriptors */ static u16 ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring, int napi_budget) { u16 tx_thresh = ICE_RING_QUARTER(xdp_ring); int budget = napi_budget / tx_thresh; u16 next_dd = xdp_ring->next_dd; u16 ntc, cleared_dds = 0; do { struct ice_tx_desc *next_dd_desc; u16 desc_cnt = xdp_ring->count; struct ice_tx_buf *tx_buf; u32 xsk_frames; u16 i; next_dd_desc = ICE_TX_DESC(xdp_ring, next_dd); if (!(next_dd_desc->cmd_type_offset_bsz & cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) break; cleared_dds++; xsk_frames = 0; if (likely(!xdp_ring->xdp_tx_active)) { xsk_frames = tx_thresh; goto skip; } ntc = xdp_ring->next_to_clean; for (i = 0; i < tx_thresh; i++) { tx_buf = &xdp_ring->tx_buf[ntc]; if (tx_buf->raw_buf) { ice_clean_xdp_tx_buf(xdp_ring, tx_buf); tx_buf->raw_buf = NULL; } else { xsk_frames++; } ntc++; if (ntc >= xdp_ring->count) ntc = 0; } skip: xdp_ring->next_to_clean += tx_thresh; if (xdp_ring->next_to_clean >= desc_cnt) xdp_ring->next_to_clean -= desc_cnt; if (xsk_frames) xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames); next_dd_desc->cmd_type_offset_bsz = 0; next_dd = next_dd + tx_thresh; if (next_dd >= desc_cnt) next_dd = tx_thresh - 1; } while (--budget); xdp_ring->next_dd = next_dd; return cleared_dds * tx_thresh; } /** * ice_xmit_pkt - produce a single HW Tx descriptor out of AF_XDP descriptor * @xdp_ring: XDP ring to produce the HW Tx descriptor on * @desc: AF_XDP descriptor to pull the DMA address and length from * @total_bytes: bytes accumulator that will be used for stats update */ static void ice_xmit_pkt(struct ice_tx_ring *xdp_ring, struct xdp_desc *desc, unsigned int *total_bytes) { struct ice_tx_desc *tx_desc; dma_addr_t dma; dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr); xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len); tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_to_use++); tx_desc->buf_addr = cpu_to_le64(dma); tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP, 0, desc->len, 0); *total_bytes += desc->len; } /** * ice_xmit_pkt_batch - produce a batch of HW Tx descriptors out of AF_XDP descriptors * @xdp_ring: XDP ring to produce the HW Tx descriptors on * @descs: AF_XDP descriptors to pull the DMA addresses and lengths from * @total_bytes: bytes accumulator that will be used for stats update */ static void ice_xmit_pkt_batch(struct ice_tx_ring *xdp_ring, struct xdp_desc *descs, unsigned int *total_bytes) { u16 tx_thresh = ICE_RING_QUARTER(xdp_ring); u16 ntu = xdp_ring->next_to_use; struct ice_tx_desc *tx_desc; u32 i; loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) { dma_addr_t dma; dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, descs[i].addr); xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, descs[i].len); tx_desc = ICE_TX_DESC(xdp_ring, ntu++); tx_desc->buf_addr = cpu_to_le64(dma); tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP, 0, descs[i].len, 0); *total_bytes += descs[i].len; } xdp_ring->next_to_use = ntu; if (xdp_ring->next_to_use > xdp_ring->next_rs) { tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs); tx_desc->cmd_type_offset_bsz |= cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S); xdp_ring->next_rs += tx_thresh; } } /** * ice_fill_tx_hw_ring - produce the number of Tx descriptors onto ring * @xdp_ring: XDP ring to produce the HW Tx descriptors on * @descs: AF_XDP descriptors to pull the DMA addresses and lengths from * @nb_pkts: count of packets to be send * @total_bytes: bytes accumulator that will be used for stats update */ static void ice_fill_tx_hw_ring(struct ice_tx_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts, unsigned int *total_bytes) { u16 tx_thresh = ICE_RING_QUARTER(xdp_ring); u32 batched, leftover, i; batched = ALIGN_DOWN(nb_pkts, PKTS_PER_BATCH); leftover = nb_pkts & (PKTS_PER_BATCH - 1); for (i = 0; i < batched; i += PKTS_PER_BATCH) ice_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes); for (; i < batched + leftover; i++) ice_xmit_pkt(xdp_ring, &descs[i], total_bytes); if (xdp_ring->next_to_use > xdp_ring->next_rs) { struct ice_tx_desc *tx_desc; tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs); tx_desc->cmd_type_offset_bsz |= cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S); xdp_ring->next_rs += tx_thresh; } } /** * ice_xmit_zc - take entries from XSK Tx ring and place them onto HW Tx ring * @xdp_ring: XDP ring to produce the HW Tx descriptors on * @budget: number of free descriptors on HW Tx ring that can be used * @napi_budget: amount of descriptors that NAPI allows us to clean * * Returns true if there is no more work that needs to be done, false otherwise */ bool ice_xmit_zc(struct ice_tx_ring *xdp_ring, u32 budget, int napi_budget) { struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs; u16 tx_thresh = ICE_RING_QUARTER(xdp_ring); u32 nb_pkts, nb_processed = 0; unsigned int total_bytes = 0; if (budget < tx_thresh) budget += ice_clean_xdp_irq_zc(xdp_ring, napi_budget); nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget); if (!nb_pkts) return true; if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) { struct ice_tx_desc *tx_desc; nb_processed = xdp_ring->count - xdp_ring->next_to_use; ice_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes); tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs); tx_desc->cmd_type_offset_bsz |= cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S); xdp_ring->next_rs = tx_thresh - 1; xdp_ring->next_to_use = 0; } ice_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed, &total_bytes); ice_xdp_ring_update_tail(xdp_ring); ice_update_tx_ring_stats(xdp_ring, nb_pkts, total_bytes); if (xsk_uses_need_wakeup(xdp_ring->xsk_pool)) xsk_set_tx_need_wakeup(xdp_ring->xsk_pool); return nb_pkts < budget; } /** * ice_xsk_wakeup - Implements ndo_xsk_wakeup * @netdev: net_device * @queue_id: queue to wake up * @flags: ignored in our case, since we have Rx and Tx in the same NAPI * * Returns negative on error, zero otherwise. */ int ice_xsk_wakeup(struct net_device *netdev, u32 queue_id, u32 __always_unused flags) { struct ice_netdev_priv *np = netdev_priv(netdev); struct ice_q_vector *q_vector; struct ice_vsi *vsi = np->vsi; struct ice_tx_ring *ring; if (test_bit(ICE_VSI_DOWN, vsi->state)) return -ENETDOWN; if (!ice_is_xdp_ena_vsi(vsi)) return -EINVAL; if (queue_id >= vsi->num_txq || queue_id >= vsi->num_rxq) return -EINVAL; ring = vsi->rx_rings[queue_id]->xdp_ring; if (!ring->xsk_pool) return -EINVAL; /* The idea here is that if NAPI is running, mark a miss, so * it will run again. If not, trigger an interrupt and * schedule the NAPI from interrupt context. If NAPI would be * scheduled here, the interrupt affinity would not be * honored. */ q_vector = ring->q_vector; if (!napi_if_scheduled_mark_missed(&q_vector->napi)) ice_trigger_sw_intr(&vsi->back->hw, q_vector); return 0; } /** * ice_xsk_any_rx_ring_ena - Checks if Rx rings have AF_XDP buff pool attached * @vsi: VSI to be checked * * Returns true if any of the Rx rings has an AF_XDP buff pool attached */ bool ice_xsk_any_rx_ring_ena(struct ice_vsi *vsi) { int i; ice_for_each_rxq(vsi, i) { if (xsk_get_pool_from_qid(vsi->netdev, i)) return true; } return false; } /** * ice_xsk_clean_rx_ring - clean buffer pool queues connected to a given Rx ring * @rx_ring: ring to be cleaned */ void ice_xsk_clean_rx_ring(struct ice_rx_ring *rx_ring) { u16 count_mask = rx_ring->count - 1; u16 ntc = rx_ring->next_to_clean; u16 ntu = rx_ring->next_to_use; for ( ; ntc != ntu; ntc = (ntc + 1) & count_mask) { struct xdp_buff *xdp = *ice_xdp_buf(rx_ring, ntc); xsk_buff_free(xdp); } } /** * ice_xsk_clean_xdp_ring - Clean the XDP Tx ring and its buffer pool queues * @xdp_ring: XDP_Tx ring */ void ice_xsk_clean_xdp_ring(struct ice_tx_ring *xdp_ring) { u16 ntc = xdp_ring->next_to_clean, ntu = xdp_ring->next_to_use; u32 xsk_frames = 0; while (ntc != ntu) { struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[ntc]; if (tx_buf->raw_buf) ice_clean_xdp_tx_buf(xdp_ring, tx_buf); else xsk_frames++; tx_buf->raw_buf = NULL; ntc++; if (ntc >= xdp_ring->count) ntc = 0; } if (xsk_frames) xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames); }