1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2019, Intel Corporation. */ 3 4 #include "ice_txrx_lib.h" 5 6 /** 7 * ice_release_rx_desc - Store the new tail and head values 8 * @rx_ring: ring to bump 9 * @val: new head index 10 */ 11 void ice_release_rx_desc(struct ice_ring *rx_ring, u16 val) 12 { 13 u16 prev_ntu = rx_ring->next_to_use & ~0x7; 14 15 rx_ring->next_to_use = val; 16 17 /* update next to alloc since we have filled the ring */ 18 rx_ring->next_to_alloc = val; 19 20 /* QRX_TAIL will be updated with any tail value, but hardware ignores 21 * the lower 3 bits. This makes it so we only bump tail on meaningful 22 * boundaries. Also, this allows us to bump tail on intervals of 8 up to 23 * the budget depending on the current traffic load. 24 */ 25 val &= ~0x7; 26 if (prev_ntu != val) { 27 /* Force memory writes to complete before letting h/w 28 * know there are new descriptors to fetch. (Only 29 * applicable for weak-ordered memory model archs, 30 * such as IA-64). 31 */ 32 wmb(); 33 writel(val, rx_ring->tail); 34 } 35 } 36 37 /** 38 * ice_ptype_to_htype - get a hash type 39 * @ptype: the ptype value from the descriptor 40 * 41 * Returns a hash type to be used by skb_set_hash 42 */ 43 static enum pkt_hash_types ice_ptype_to_htype(u8 __always_unused ptype) 44 { 45 return PKT_HASH_TYPE_NONE; 46 } 47 48 /** 49 * ice_rx_hash - set the hash value in the skb 50 * @rx_ring: descriptor ring 51 * @rx_desc: specific descriptor 52 * @skb: pointer to current skb 53 * @rx_ptype: the ptype value from the descriptor 54 */ 55 static void 56 ice_rx_hash(struct ice_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc, 57 struct sk_buff *skb, u8 rx_ptype) 58 { 59 struct ice_32b_rx_flex_desc_nic *nic_mdid; 60 u32 hash; 61 62 if (!(rx_ring->netdev->features & NETIF_F_RXHASH)) 63 return; 64 65 if (rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC) 66 return; 67 68 nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc; 69 hash = le32_to_cpu(nic_mdid->rss_hash); 70 skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype)); 71 } 72 73 /** 74 * ice_rx_csum - Indicate in skb if checksum is good 75 * @ring: the ring we care about 76 * @skb: skb currently being received and modified 77 * @rx_desc: the receive descriptor 78 * @ptype: the packet type decoded by hardware 79 * 80 * skb->protocol must be set before this function is called 81 */ 82 static void 83 ice_rx_csum(struct ice_ring *ring, struct sk_buff *skb, 84 union ice_32b_rx_flex_desc *rx_desc, u8 ptype) 85 { 86 struct ice_rx_ptype_decoded decoded; 87 u16 rx_status0, rx_status1; 88 bool ipv4, ipv6; 89 90 rx_status0 = le16_to_cpu(rx_desc->wb.status_error0); 91 rx_status1 = le16_to_cpu(rx_desc->wb.status_error1); 92 93 decoded = ice_decode_rx_desc_ptype(ptype); 94 95 /* Start with CHECKSUM_NONE and by default csum_level = 0 */ 96 skb->ip_summed = CHECKSUM_NONE; 97 skb_checksum_none_assert(skb); 98 99 /* check if Rx checksum is enabled */ 100 if (!(ring->netdev->features & NETIF_F_RXCSUM)) 101 return; 102 103 /* check if HW has decoded the packet and checksum */ 104 if (!(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S))) 105 return; 106 107 if (!(decoded.known && decoded.outer_ip)) 108 return; 109 110 ipv4 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) && 111 (decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV4); 112 ipv6 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) && 113 (decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV6); 114 115 if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_IPE_S) | 116 BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S)))) 117 goto checksum_fail; 118 119 if (ipv6 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_IPV6EXADD_S)))) 120 goto checksum_fail; 121 122 /* check for L4 errors and handle packets that were not able to be 123 * checksummed due to arrival speed 124 */ 125 if (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S)) 126 goto checksum_fail; 127 128 /* check for outer UDP checksum error in tunneled packets */ 129 if ((rx_status1 & BIT(ICE_RX_FLEX_DESC_STATUS1_NAT_S)) && 130 (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EUDPE_S))) 131 goto checksum_fail; 132 133 /* If there is an outer header present that might contain a checksum 134 * we need to bump the checksum level by 1 to reflect the fact that 135 * we are indicating we validated the inner checksum. 136 */ 137 if (decoded.tunnel_type >= ICE_RX_PTYPE_TUNNEL_IP_GRENAT) 138 skb->csum_level = 1; 139 140 /* Only report checksum unnecessary for TCP, UDP, or SCTP */ 141 switch (decoded.inner_prot) { 142 case ICE_RX_PTYPE_INNER_PROT_TCP: 143 case ICE_RX_PTYPE_INNER_PROT_UDP: 144 case ICE_RX_PTYPE_INNER_PROT_SCTP: 145 skb->ip_summed = CHECKSUM_UNNECESSARY; 146 break; 147 default: 148 break; 149 } 150 return; 151 152 checksum_fail: 153 ring->vsi->back->hw_csum_rx_error++; 154 } 155 156 /** 157 * ice_process_skb_fields - Populate skb header fields from Rx descriptor 158 * @rx_ring: Rx descriptor ring packet is being transacted on 159 * @rx_desc: pointer to the EOP Rx descriptor 160 * @skb: pointer to current skb being populated 161 * @ptype: the packet type decoded by hardware 162 * 163 * This function checks the ring, descriptor, and packet information in 164 * order to populate the hash, checksum, VLAN, protocol, and 165 * other fields within the skb. 166 */ 167 void 168 ice_process_skb_fields(struct ice_ring *rx_ring, 169 union ice_32b_rx_flex_desc *rx_desc, 170 struct sk_buff *skb, u8 ptype) 171 { 172 ice_rx_hash(rx_ring, rx_desc, skb, ptype); 173 174 /* modifies the skb - consumes the enet header */ 175 skb->protocol = eth_type_trans(skb, rx_ring->netdev); 176 177 ice_rx_csum(rx_ring, skb, rx_desc, ptype); 178 179 if (rx_ring->ptp_rx) 180 ice_ptp_rx_hwtstamp(rx_ring, rx_desc, skb); 181 } 182 183 /** 184 * ice_receive_skb - Send a completed packet up the stack 185 * @rx_ring: Rx ring in play 186 * @skb: packet to send up 187 * @vlan_tag: VLAN tag for packet 188 * 189 * This function sends the completed packet (via. skb) up the stack using 190 * gro receive functions (with/without VLAN tag) 191 */ 192 void 193 ice_receive_skb(struct ice_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag) 194 { 195 if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) && 196 (vlan_tag & VLAN_VID_MASK)) 197 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag); 198 napi_gro_receive(&rx_ring->q_vector->napi, skb); 199 } 200 201 /** 202 * ice_xmit_xdp_ring - submit single packet to XDP ring for transmission 203 * @data: packet data pointer 204 * @size: packet data size 205 * @xdp_ring: XDP ring for transmission 206 */ 207 int ice_xmit_xdp_ring(void *data, u16 size, struct ice_ring *xdp_ring) 208 { 209 u16 i = xdp_ring->next_to_use; 210 struct ice_tx_desc *tx_desc; 211 struct ice_tx_buf *tx_buf; 212 dma_addr_t dma; 213 214 if (!unlikely(ICE_DESC_UNUSED(xdp_ring))) { 215 xdp_ring->tx_stats.tx_busy++; 216 return ICE_XDP_CONSUMED; 217 } 218 219 dma = dma_map_single(xdp_ring->dev, data, size, DMA_TO_DEVICE); 220 if (dma_mapping_error(xdp_ring->dev, dma)) 221 return ICE_XDP_CONSUMED; 222 223 tx_buf = &xdp_ring->tx_buf[i]; 224 tx_buf->bytecount = size; 225 tx_buf->gso_segs = 1; 226 tx_buf->raw_buf = data; 227 228 /* record length, and DMA address */ 229 dma_unmap_len_set(tx_buf, len, size); 230 dma_unmap_addr_set(tx_buf, dma, dma); 231 232 tx_desc = ICE_TX_DESC(xdp_ring, i); 233 tx_desc->buf_addr = cpu_to_le64(dma); 234 tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TXD_LAST_DESC_CMD, 0, 235 size, 0); 236 237 /* Make certain all of the status bits have been updated 238 * before next_to_watch is written. 239 */ 240 smp_wmb(); 241 242 i++; 243 if (i == xdp_ring->count) 244 i = 0; 245 246 tx_buf->next_to_watch = tx_desc; 247 xdp_ring->next_to_use = i; 248 249 return ICE_XDP_TX; 250 } 251 252 /** 253 * ice_xmit_xdp_buff - convert an XDP buffer to an XDP frame and send it 254 * @xdp: XDP buffer 255 * @xdp_ring: XDP Tx ring 256 * 257 * Returns negative on failure, 0 on success. 258 */ 259 int ice_xmit_xdp_buff(struct xdp_buff *xdp, struct ice_ring *xdp_ring) 260 { 261 struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp); 262 263 if (unlikely(!xdpf)) 264 return ICE_XDP_CONSUMED; 265 266 return ice_xmit_xdp_ring(xdpf->data, xdpf->len, xdp_ring); 267 } 268 269 /** 270 * ice_finalize_xdp_rx - Bump XDP Tx tail and/or flush redirect map 271 * @rx_ring: Rx ring 272 * @xdp_res: Result of the receive batch 273 * 274 * This function bumps XDP Tx tail and/or flush redirect map, and 275 * should be called when a batch of packets has been processed in the 276 * napi loop. 277 */ 278 void ice_finalize_xdp_rx(struct ice_ring *rx_ring, unsigned int xdp_res) 279 { 280 if (xdp_res & ICE_XDP_REDIR) 281 xdp_do_flush_map(); 282 283 if (xdp_res & ICE_XDP_TX) { 284 struct ice_ring *xdp_ring = 285 rx_ring->vsi->xdp_rings[rx_ring->q_index]; 286 287 ice_xdp_ring_update_tail(xdp_ring); 288 } 289 } 290