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 default: 147 break; 148 } 149 return; 150 151 checksum_fail: 152 ring->vsi->back->hw_csum_rx_error++; 153 } 154 155 /** 156 * ice_process_skb_fields - Populate skb header fields from Rx descriptor 157 * @rx_ring: Rx descriptor ring packet is being transacted on 158 * @rx_desc: pointer to the EOP Rx descriptor 159 * @skb: pointer to current skb being populated 160 * @ptype: the packet type decoded by hardware 161 * 162 * This function checks the ring, descriptor, and packet information in 163 * order to populate the hash, checksum, VLAN, protocol, and 164 * other fields within the skb. 165 */ 166 void 167 ice_process_skb_fields(struct ice_ring *rx_ring, 168 union ice_32b_rx_flex_desc *rx_desc, 169 struct sk_buff *skb, u8 ptype) 170 { 171 ice_rx_hash(rx_ring, rx_desc, skb, ptype); 172 173 /* modifies the skb - consumes the enet header */ 174 skb->protocol = eth_type_trans(skb, rx_ring->netdev); 175 176 ice_rx_csum(rx_ring, skb, rx_desc, ptype); 177 } 178 179 /** 180 * ice_receive_skb - Send a completed packet up the stack 181 * @rx_ring: Rx ring in play 182 * @skb: packet to send up 183 * @vlan_tag: VLAN tag for packet 184 * 185 * This function sends the completed packet (via. skb) up the stack using 186 * gro receive functions (with/without VLAN tag) 187 */ 188 void 189 ice_receive_skb(struct ice_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag) 190 { 191 if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) && 192 (vlan_tag & VLAN_VID_MASK)) 193 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag); 194 napi_gro_receive(&rx_ring->q_vector->napi, skb); 195 } 196 197 /** 198 * ice_xmit_xdp_ring - submit single packet to XDP ring for transmission 199 * @data: packet data pointer 200 * @size: packet data size 201 * @xdp_ring: XDP ring for transmission 202 */ 203 int ice_xmit_xdp_ring(void *data, u16 size, struct ice_ring *xdp_ring) 204 { 205 u16 i = xdp_ring->next_to_use; 206 struct ice_tx_desc *tx_desc; 207 struct ice_tx_buf *tx_buf; 208 dma_addr_t dma; 209 210 if (!unlikely(ICE_DESC_UNUSED(xdp_ring))) { 211 xdp_ring->tx_stats.tx_busy++; 212 return ICE_XDP_CONSUMED; 213 } 214 215 dma = dma_map_single(xdp_ring->dev, data, size, DMA_TO_DEVICE); 216 if (dma_mapping_error(xdp_ring->dev, dma)) 217 return ICE_XDP_CONSUMED; 218 219 tx_buf = &xdp_ring->tx_buf[i]; 220 tx_buf->bytecount = size; 221 tx_buf->gso_segs = 1; 222 tx_buf->raw_buf = data; 223 224 /* record length, and DMA address */ 225 dma_unmap_len_set(tx_buf, len, size); 226 dma_unmap_addr_set(tx_buf, dma, dma); 227 228 tx_desc = ICE_TX_DESC(xdp_ring, i); 229 tx_desc->buf_addr = cpu_to_le64(dma); 230 tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TXD_LAST_DESC_CMD, 0, 231 size, 0); 232 233 /* Make certain all of the status bits have been updated 234 * before next_to_watch is written. 235 */ 236 smp_wmb(); 237 238 i++; 239 if (i == xdp_ring->count) 240 i = 0; 241 242 tx_buf->next_to_watch = tx_desc; 243 xdp_ring->next_to_use = i; 244 245 return ICE_XDP_TX; 246 } 247 248 /** 249 * ice_xmit_xdp_buff - convert an XDP buffer to an XDP frame and send it 250 * @xdp: XDP buffer 251 * @xdp_ring: XDP Tx ring 252 * 253 * Returns negative on failure, 0 on success. 254 */ 255 int ice_xmit_xdp_buff(struct xdp_buff *xdp, struct ice_ring *xdp_ring) 256 { 257 struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp); 258 259 if (unlikely(!xdpf)) 260 return ICE_XDP_CONSUMED; 261 262 return ice_xmit_xdp_ring(xdpf->data, xdpf->len, xdp_ring); 263 } 264 265 /** 266 * ice_finalize_xdp_rx - Bump XDP Tx tail and/or flush redirect map 267 * @rx_ring: Rx ring 268 * @xdp_res: Result of the receive batch 269 * 270 * This function bumps XDP Tx tail and/or flush redirect map, and 271 * should be called when a batch of packets has been processed in the 272 * napi loop. 273 */ 274 void ice_finalize_xdp_rx(struct ice_ring *rx_ring, unsigned int xdp_res) 275 { 276 if (xdp_res & ICE_XDP_REDIR) 277 xdp_do_flush_map(); 278 279 if (xdp_res & ICE_XDP_TX) { 280 struct ice_ring *xdp_ring = 281 rx_ring->vsi->xdp_rings[rx_ring->q_index]; 282 283 ice_xdp_ring_update_tail(xdp_ring); 284 } 285 } 286