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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2019, Intel Corporation. */3 4#include <linux/filter.h>5#include <linux/net/intel/libie/rx.h>6 7#include "ice_txrx_lib.h"8#include "ice_eswitch.h"9#include "ice_lib.h"10 11/**12 * ice_release_rx_desc - Store the new tail and head values13 * @rx_ring: ring to bump14 * @val: new head index15 */16void ice_release_rx_desc(struct ice_rx_ring *rx_ring, u16 val)17{18 u16 prev_ntu = rx_ring->next_to_use & ~0x7;19 20 rx_ring->next_to_use = val;21 22 /* update next to alloc since we have filled the ring */23 rx_ring->next_to_alloc = val;24 25 /* QRX_TAIL will be updated with any tail value, but hardware ignores26 * the lower 3 bits. This makes it so we only bump tail on meaningful27 * boundaries. Also, this allows us to bump tail on intervals of 8 up to28 * the budget depending on the current traffic load.29 */30 val &= ~0x7;31 if (prev_ntu != val) {32 /* Force memory writes to complete before letting h/w33 * know there are new descriptors to fetch. (Only34 * applicable for weak-ordered memory model archs,35 * such as IA-64).36 */37 wmb();38 writel(val, rx_ring->tail);39 }40}41 42/**43 * ice_get_rx_hash - get RX hash value from descriptor44 * @rx_desc: specific descriptor45 *46 * Returns hash, if present, 0 otherwise.47 */48static u32 ice_get_rx_hash(const union ice_32b_rx_flex_desc *rx_desc)49{50 const struct ice_32b_rx_flex_desc_nic *nic_mdid;51 52 if (unlikely(rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC))53 return 0;54 55 nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc;56 return le32_to_cpu(nic_mdid->rss_hash);57}58 59/**60 * ice_rx_hash_to_skb - set the hash value in the skb61 * @rx_ring: descriptor ring62 * @rx_desc: specific descriptor63 * @skb: pointer to current skb64 * @rx_ptype: the ptype value from the descriptor65 */66static void67ice_rx_hash_to_skb(const struct ice_rx_ring *rx_ring,68 const union ice_32b_rx_flex_desc *rx_desc,69 struct sk_buff *skb, u16 rx_ptype)70{71 struct libeth_rx_pt decoded;72 u32 hash;73 74 decoded = libie_rx_pt_parse(rx_ptype);75 if (!libeth_rx_pt_has_hash(rx_ring->netdev, decoded))76 return;77 78 hash = ice_get_rx_hash(rx_desc);79 if (likely(hash))80 libeth_rx_pt_set_hash(skb, hash, decoded);81}82 83/**84 * ice_rx_csum - Indicate in skb if checksum is good85 * @ring: the ring we care about86 * @skb: skb currently being received and modified87 * @rx_desc: the receive descriptor88 * @ptype: the packet type decoded by hardware89 *90 * skb->protocol must be set before this function is called91 */92static void93ice_rx_csum(struct ice_rx_ring *ring, struct sk_buff *skb,94 union ice_32b_rx_flex_desc *rx_desc, u16 ptype)95{96 struct libeth_rx_pt decoded;97 u16 rx_status0, rx_status1;98 bool ipv4, ipv6;99 100 /* Start with CHECKSUM_NONE and by default csum_level = 0 */101 skb->ip_summed = CHECKSUM_NONE;102 103 decoded = libie_rx_pt_parse(ptype);104 if (!libeth_rx_pt_has_checksum(ring->netdev, decoded))105 return;106 107 rx_status0 = le16_to_cpu(rx_desc->wb.status_error0);108 rx_status1 = le16_to_cpu(rx_desc->wb.status_error1);109 110 /* check if HW has decoded the packet and checksum */111 if (!(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S)))112 return;113 114 ipv4 = libeth_rx_pt_get_ip_ver(decoded) == LIBETH_RX_PT_OUTER_IPV4;115 ipv6 = libeth_rx_pt_get_ip_ver(decoded) == LIBETH_RX_PT_OUTER_IPV6;116 117 if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S)))) {118 ring->vsi->back->hw_rx_eipe_error++;119 return;120 }121 122 if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_IPE_S))))123 goto checksum_fail;124 125 if (ipv6 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_IPV6EXADD_S))))126 goto checksum_fail;127 128 /* check for L4 errors and handle packets that were not able to be129 * checksummed due to arrival speed130 */131 if (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S))132 goto checksum_fail;133 134 /* check for outer UDP checksum error in tunneled packets */135 if ((rx_status1 & BIT(ICE_RX_FLEX_DESC_STATUS1_NAT_S)) &&136 (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EUDPE_S)))137 goto checksum_fail;138 139 /* If there is an outer header present that might contain a checksum140 * we need to bump the checksum level by 1 to reflect the fact that141 * we are indicating we validated the inner checksum.142 */143 if (decoded.tunnel_type >= LIBETH_RX_PT_TUNNEL_IP_GRENAT)144 skb->csum_level = 1;145 146 skb->ip_summed = CHECKSUM_UNNECESSARY;147 return;148 149checksum_fail:150 ring->vsi->back->hw_csum_rx_error++;151}152 153/**154 * ice_ptp_rx_hwts_to_skb - Put RX timestamp into skb155 * @rx_ring: Ring to get the VSI info156 * @rx_desc: Receive descriptor157 * @skb: Particular skb to send timestamp with158 *159 * The timestamp is in ns, so we must convert the result first.160 */161static void162ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring,163 const union ice_32b_rx_flex_desc *rx_desc,164 struct sk_buff *skb)165{166 u64 ts_ns = ice_ptp_get_rx_hwts(rx_desc, &rx_ring->pkt_ctx);167 168 skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ts_ns);169}170 171/**172 * ice_get_ptype - Read HW packet type from the descriptor173 * @rx_desc: RX descriptor174 */175static u16 ice_get_ptype(const union ice_32b_rx_flex_desc *rx_desc)176{177 return le16_to_cpu(rx_desc->wb.ptype_flex_flags0) &178 ICE_RX_FLEX_DESC_PTYPE_M;179}180 181/**182 * ice_process_skb_fields - Populate skb header fields from Rx descriptor183 * @rx_ring: Rx descriptor ring packet is being transacted on184 * @rx_desc: pointer to the EOP Rx descriptor185 * @skb: pointer to current skb being populated186 *187 * This function checks the ring, descriptor, and packet information in188 * order to populate the hash, checksum, VLAN, protocol, and189 * other fields within the skb.190 */191void192ice_process_skb_fields(struct ice_rx_ring *rx_ring,193 union ice_32b_rx_flex_desc *rx_desc,194 struct sk_buff *skb)195{196 u16 ptype = ice_get_ptype(rx_desc);197 198 ice_rx_hash_to_skb(rx_ring, rx_desc, skb, ptype);199 200 /* modifies the skb - consumes the enet header */201 if (unlikely(rx_ring->flags & ICE_RX_FLAGS_MULTIDEV)) {202 struct net_device *netdev = ice_eswitch_get_target(rx_ring,203 rx_desc);204 205 if (ice_is_port_repr_netdev(netdev))206 ice_repr_inc_rx_stats(netdev, skb->len);207 skb->protocol = eth_type_trans(skb, netdev);208 } else {209 skb->protocol = eth_type_trans(skb, rx_ring->netdev);210 }211 212 ice_rx_csum(rx_ring, skb, rx_desc, ptype);213 214 if (rx_ring->ptp_rx)215 ice_ptp_rx_hwts_to_skb(rx_ring, rx_desc, skb);216}217 218/**219 * ice_receive_skb - Send a completed packet up the stack220 * @rx_ring: Rx ring in play221 * @skb: packet to send up222 * @vlan_tci: VLAN TCI for packet223 *224 * This function sends the completed packet (via. skb) up the stack using225 * gro receive functions (with/without VLAN tag)226 */227void228ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tci)229{230 if ((vlan_tci & VLAN_VID_MASK) && rx_ring->vlan_proto)231 __vlan_hwaccel_put_tag(skb, rx_ring->vlan_proto,232 vlan_tci);233 234 napi_gro_receive(&rx_ring->q_vector->napi, skb);235}236 237/**238 * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer239 * @dev: device for DMA mapping240 * @tx_buf: Tx buffer to clean241 * @bq: XDP bulk flush struct242 */243static void244ice_clean_xdp_tx_buf(struct device *dev, struct ice_tx_buf *tx_buf,245 struct xdp_frame_bulk *bq)246{247 dma_unmap_single(dev, dma_unmap_addr(tx_buf, dma),248 dma_unmap_len(tx_buf, len), DMA_TO_DEVICE);249 dma_unmap_len_set(tx_buf, len, 0);250 251 switch (tx_buf->type) {252 case ICE_TX_BUF_XDP_TX:253 page_frag_free(tx_buf->raw_buf);254 break;255 case ICE_TX_BUF_XDP_XMIT:256 xdp_return_frame_bulk(tx_buf->xdpf, bq);257 break;258 }259 260 tx_buf->type = ICE_TX_BUF_EMPTY;261}262 263/**264 * ice_clean_xdp_irq - Reclaim resources after transmit completes on XDP ring265 * @xdp_ring: XDP ring to clean266 */267static u32 ice_clean_xdp_irq(struct ice_tx_ring *xdp_ring)268{269 int total_bytes = 0, total_pkts = 0;270 struct device *dev = xdp_ring->dev;271 u32 ntc = xdp_ring->next_to_clean;272 struct ice_tx_desc *tx_desc;273 u32 cnt = xdp_ring->count;274 struct xdp_frame_bulk bq;275 u32 frags, xdp_tx = 0;276 u32 ready_frames = 0;277 u32 idx;278 u32 ret;279 280 idx = xdp_ring->tx_buf[ntc].rs_idx;281 tx_desc = ICE_TX_DESC(xdp_ring, idx);282 if (tx_desc->cmd_type_offset_bsz &283 cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)) {284 if (idx >= ntc)285 ready_frames = idx - ntc + 1;286 else287 ready_frames = idx + cnt - ntc + 1;288 }289 290 if (unlikely(!ready_frames))291 return 0;292 ret = ready_frames;293 294 xdp_frame_bulk_init(&bq);295 rcu_read_lock(); /* xdp_return_frame_bulk() */296 297 while (ready_frames) {298 struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[ntc];299 struct ice_tx_buf *head = tx_buf;300 301 /* bytecount holds size of head + frags */302 total_bytes += tx_buf->bytecount;303 frags = tx_buf->nr_frags;304 total_pkts++;305 /* count head + frags */306 ready_frames -= frags + 1;307 xdp_tx++;308 309 ntc++;310 if (ntc == cnt)311 ntc = 0;312 313 for (int i = 0; i < frags; i++) {314 tx_buf = &xdp_ring->tx_buf[ntc];315 316 ice_clean_xdp_tx_buf(dev, tx_buf, &bq);317 ntc++;318 if (ntc == cnt)319 ntc = 0;320 }321 322 ice_clean_xdp_tx_buf(dev, head, &bq);323 }324 325 xdp_flush_frame_bulk(&bq);326 rcu_read_unlock();327 328 tx_desc->cmd_type_offset_bsz = 0;329 xdp_ring->next_to_clean = ntc;330 xdp_ring->xdp_tx_active -= xdp_tx;331 ice_update_tx_ring_stats(xdp_ring, total_pkts, total_bytes);332 333 return ret;334}335 336/**337 * __ice_xmit_xdp_ring - submit frame to XDP ring for transmission338 * @xdp: XDP buffer to be placed onto Tx descriptors339 * @xdp_ring: XDP ring for transmission340 * @frame: whether this comes from .ndo_xdp_xmit()341 */342int __ice_xmit_xdp_ring(struct xdp_buff *xdp, struct ice_tx_ring *xdp_ring,343 bool frame)344{345 struct skb_shared_info *sinfo = NULL;346 u32 size = xdp->data_end - xdp->data;347 struct device *dev = xdp_ring->dev;348 u32 ntu = xdp_ring->next_to_use;349 struct ice_tx_desc *tx_desc;350 struct ice_tx_buf *tx_head;351 struct ice_tx_buf *tx_buf;352 u32 cnt = xdp_ring->count;353 void *data = xdp->data;354 u32 nr_frags = 0;355 u32 free_space;356 u32 frag = 0;357 358 free_space = ICE_DESC_UNUSED(xdp_ring);359 if (free_space < ICE_RING_QUARTER(xdp_ring))360 free_space += ice_clean_xdp_irq(xdp_ring);361 362 if (unlikely(!free_space))363 goto busy;364 365 if (unlikely(xdp_buff_has_frags(xdp))) {366 sinfo = xdp_get_shared_info_from_buff(xdp);367 nr_frags = sinfo->nr_frags;368 if (free_space < nr_frags + 1)369 goto busy;370 }371 372 tx_desc = ICE_TX_DESC(xdp_ring, ntu);373 tx_head = &xdp_ring->tx_buf[ntu];374 tx_buf = tx_head;375 376 for (;;) {377 dma_addr_t dma;378 379 dma = dma_map_single(dev, data, size, DMA_TO_DEVICE);380 if (dma_mapping_error(dev, dma))381 goto dma_unmap;382 383 /* record length, and DMA address */384 dma_unmap_len_set(tx_buf, len, size);385 dma_unmap_addr_set(tx_buf, dma, dma);386 387 if (frame) {388 tx_buf->type = ICE_TX_BUF_FRAG;389 } else {390 tx_buf->type = ICE_TX_BUF_XDP_TX;391 tx_buf->raw_buf = data;392 }393 394 tx_desc->buf_addr = cpu_to_le64(dma);395 tx_desc->cmd_type_offset_bsz = ice_build_ctob(0, 0, size, 0);396 397 ntu++;398 if (ntu == cnt)399 ntu = 0;400 401 if (frag == nr_frags)402 break;403 404 tx_desc = ICE_TX_DESC(xdp_ring, ntu);405 tx_buf = &xdp_ring->tx_buf[ntu];406 407 data = skb_frag_address(&sinfo->frags[frag]);408 size = skb_frag_size(&sinfo->frags[frag]);409 frag++;410 }411 412 /* store info about bytecount and frag count in first desc */413 tx_head->bytecount = xdp_get_buff_len(xdp);414 tx_head->nr_frags = nr_frags;415 416 if (frame) {417 tx_head->type = ICE_TX_BUF_XDP_XMIT;418 tx_head->xdpf = xdp->data_hard_start;419 }420 421 /* update last descriptor from a frame with EOP */422 tx_desc->cmd_type_offset_bsz |=423 cpu_to_le64(ICE_TX_DESC_CMD_EOP << ICE_TXD_QW1_CMD_S);424 425 xdp_ring->xdp_tx_active++;426 xdp_ring->next_to_use = ntu;427 428 return ICE_XDP_TX;429 430dma_unmap:431 for (;;) {432 tx_buf = &xdp_ring->tx_buf[ntu];433 dma_unmap_page(dev, dma_unmap_addr(tx_buf, dma),434 dma_unmap_len(tx_buf, len), DMA_TO_DEVICE);435 dma_unmap_len_set(tx_buf, len, 0);436 if (tx_buf == tx_head)437 break;438 439 if (!ntu)440 ntu += cnt;441 ntu--;442 }443 return ICE_XDP_CONSUMED;444 445busy:446 xdp_ring->ring_stats->tx_stats.tx_busy++;447 448 return ICE_XDP_CONSUMED;449}450 451/**452 * ice_finalize_xdp_rx - Bump XDP Tx tail and/or flush redirect map453 * @xdp_ring: XDP ring454 * @xdp_res: Result of the receive batch455 * @first_idx: index to write from caller456 *457 * This function bumps XDP Tx tail and/or flush redirect map, and458 * should be called when a batch of packets has been processed in the459 * napi loop.460 */461void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res,462 u32 first_idx)463{464 struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[first_idx];465 466 if (xdp_res & ICE_XDP_REDIR)467 xdp_do_flush();468 469 if (xdp_res & ICE_XDP_TX) {470 if (static_branch_unlikely(&ice_xdp_locking_key))471 spin_lock(&xdp_ring->tx_lock);472 /* store index of descriptor with RS bit set in the first473 * ice_tx_buf of given NAPI batch474 */475 tx_buf->rs_idx = ice_set_rs_bit(xdp_ring);476 ice_xdp_ring_update_tail(xdp_ring);477 if (static_branch_unlikely(&ice_xdp_locking_key))478 spin_unlock(&xdp_ring->tx_lock);479 }480}481 482/**483 * ice_xdp_rx_hw_ts - HW timestamp XDP hint handler484 * @ctx: XDP buff pointer485 * @ts_ns: destination address486 *487 * Copy HW timestamp (if available) to the destination address.488 */489static int ice_xdp_rx_hw_ts(const struct xdp_md *ctx, u64 *ts_ns)490{491 const struct ice_xdp_buff *xdp_ext = (void *)ctx;492 493 *ts_ns = ice_ptp_get_rx_hwts(xdp_ext->eop_desc,494 xdp_ext->pkt_ctx);495 if (!*ts_ns)496 return -ENODATA;497 498 return 0;499}500 501/**502 * ice_xdp_rx_hash_type - Get XDP-specific hash type from the RX descriptor503 * @eop_desc: End of Packet descriptor504 */505static enum xdp_rss_hash_type506ice_xdp_rx_hash_type(const union ice_32b_rx_flex_desc *eop_desc)507{508 return libie_rx_pt_parse(ice_get_ptype(eop_desc)).hash_type;509}510 511/**512 * ice_xdp_rx_hash - RX hash XDP hint handler513 * @ctx: XDP buff pointer514 * @hash: hash destination address515 * @rss_type: XDP hash type destination address516 *517 * Copy RX hash (if available) and its type to the destination address.518 */519static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,520 enum xdp_rss_hash_type *rss_type)521{522 const struct ice_xdp_buff *xdp_ext = (void *)ctx;523 524 *hash = ice_get_rx_hash(xdp_ext->eop_desc);525 *rss_type = ice_xdp_rx_hash_type(xdp_ext->eop_desc);526 if (!likely(*hash))527 return -ENODATA;528 529 return 0;530}531 532/**533 * ice_xdp_rx_vlan_tag - VLAN tag XDP hint handler534 * @ctx: XDP buff pointer535 * @vlan_proto: destination address for VLAN protocol536 * @vlan_tci: destination address for VLAN TCI537 *538 * Copy VLAN tag (if was stripped) and corresponding protocol539 * to the destination address.540 */541static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, __be16 *vlan_proto,542 u16 *vlan_tci)543{544 const struct ice_xdp_buff *xdp_ext = (void *)ctx;545 546 *vlan_proto = xdp_ext->pkt_ctx->vlan_proto;547 if (!*vlan_proto)548 return -ENODATA;549 550 *vlan_tci = ice_get_vlan_tci(xdp_ext->eop_desc);551 if (!*vlan_tci)552 return -ENODATA;553 554 return 0;555}556 557const struct xdp_metadata_ops ice_xdp_md_ops = {558 .xmo_rx_timestamp = ice_xdp_rx_hw_ts,559 .xmo_rx_hash = ice_xdp_rx_hash,560 .xmo_rx_vlan_tag = ice_xdp_rx_vlan_tag,561};562