diff options
Diffstat (limited to 'drivers/net/ethernet/intel/ice/ice_txrx_lib.c')
| -rw-r--r-- | drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 604 |
1 files changed, 604 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c new file mode 100644 index 000000000000..956da38d63b0 --- /dev/null +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c @@ -0,0 +1,604 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019, Intel Corporation. */ + +#include <linux/filter.h> +#include <linux/net/intel/libie/rx.h> +#include <net/libeth/xdp.h> + +#include "ice_txrx_lib.h" +#include "ice_eswitch.h" +#include "ice_lib.h" + +/** + * ice_release_rx_desc - Store the new tail and head values + * @rx_ring: ring to bump + * @val: new head index + */ +void ice_release_rx_desc(struct ice_rx_ring *rx_ring, u16 val) +{ + u16 prev_ntu = rx_ring->next_to_use & ~0x7; + + rx_ring->next_to_use = val; + + /* update next to alloc since we have filled the ring */ + rx_ring->next_to_alloc = val; + + /* QRX_TAIL will be updated with any tail value, but hardware ignores + * the lower 3 bits. This makes it so we only bump tail on meaningful + * boundaries. Also, this allows us to bump tail on intervals of 8 up to + * the budget depending on the current traffic load. + */ + val &= ~0x7; + if (prev_ntu != val) { + /* Force memory writes to complete before letting h/w + * know there are new descriptors to fetch. (Only + * applicable for weak-ordered memory model archs, + * such as IA-64). + */ + wmb(); + writel(val, rx_ring->tail); + } +} + +/** + * ice_get_rx_hash - get RX hash value from descriptor + * @rx_desc: specific descriptor + * + * Returns hash, if present, 0 otherwise. + */ +static u32 ice_get_rx_hash(const union ice_32b_rx_flex_desc *rx_desc) +{ + const struct ice_32b_rx_flex_desc_nic *nic_mdid; + + if (unlikely(rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC)) + return 0; + + nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc; + return le32_to_cpu(nic_mdid->rss_hash); +} + +/** + * ice_rx_hash_to_skb - set the hash value in the skb + * @rx_ring: descriptor ring + * @rx_desc: specific descriptor + * @skb: pointer to current skb + * @rx_ptype: the ptype value from the descriptor + */ +static void +ice_rx_hash_to_skb(const struct ice_rx_ring *rx_ring, + const union ice_32b_rx_flex_desc *rx_desc, + struct sk_buff *skb, u16 rx_ptype) +{ + struct libeth_rx_pt decoded; + u32 hash; + + decoded = libie_rx_pt_parse(rx_ptype); + if (!libeth_rx_pt_has_hash(rx_ring->netdev, decoded)) + return; + + hash = ice_get_rx_hash(rx_desc); + if (likely(hash)) + libeth_rx_pt_set_hash(skb, hash, decoded); +} + +/** + * ice_rx_gcs - Set generic checksum in skb + * @skb: skb currently being received and modified + * @rx_desc: receive descriptor + */ +static void ice_rx_gcs(struct sk_buff *skb, + const union ice_32b_rx_flex_desc *rx_desc) +{ + const struct ice_32b_rx_flex_desc_nic *desc; + u16 csum; + + desc = (struct ice_32b_rx_flex_desc_nic *)rx_desc; + skb->ip_summed = CHECKSUM_COMPLETE; + csum = (__force u16)desc->raw_csum; + skb->csum = csum_unfold((__force __sum16)swab16(csum)); +} + +/** + * ice_rx_csum - Indicate in skb if checksum is good + * @ring: the ring we care about + * @skb: skb currently being received and modified + * @rx_desc: the receive descriptor + * @ptype: the packet type decoded by hardware + * + * skb->protocol must be set before this function is called + */ +static void +ice_rx_csum(struct ice_rx_ring *ring, struct sk_buff *skb, + union ice_32b_rx_flex_desc *rx_desc, u16 ptype) +{ + struct libeth_rx_pt decoded; + u16 rx_status0, rx_status1; + bool ipv4, ipv6; + + /* Start with CHECKSUM_NONE and by default csum_level = 0 */ + skb->ip_summed = CHECKSUM_NONE; + + decoded = libie_rx_pt_parse(ptype); + if (!libeth_rx_pt_has_checksum(ring->netdev, decoded)) + return; + + rx_status0 = le16_to_cpu(rx_desc->wb.status_error0); + rx_status1 = le16_to_cpu(rx_desc->wb.status_error1); + + if ((ring->flags & ICE_RX_FLAGS_RING_GCS) && + rx_desc->wb.rxdid == ICE_RXDID_FLEX_NIC && + (decoded.inner_prot == LIBETH_RX_PT_INNER_TCP || + decoded.inner_prot == LIBETH_RX_PT_INNER_UDP || + decoded.inner_prot == LIBETH_RX_PT_INNER_ICMP)) { + ice_rx_gcs(skb, rx_desc); + return; + } + + /* check if HW has decoded the packet and checksum */ + if (!(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S))) + return; + + ipv4 = libeth_rx_pt_get_ip_ver(decoded) == LIBETH_RX_PT_OUTER_IPV4; + ipv6 = libeth_rx_pt_get_ip_ver(decoded) == LIBETH_RX_PT_OUTER_IPV6; + + if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S)))) { + ring->vsi->back->hw_rx_eipe_error++; + return; + } + + if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_IPE_S)))) + goto checksum_fail; + + if (ipv6 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_IPV6EXADD_S)))) + goto checksum_fail; + + /* check for L4 errors and handle packets that were not able to be + * checksummed due to arrival speed + */ + if (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S)) + goto checksum_fail; + + /* check for outer UDP checksum error in tunneled packets */ + if ((rx_status1 & BIT(ICE_RX_FLEX_DESC_STATUS1_NAT_S)) && + (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EUDPE_S))) + goto checksum_fail; + + /* If there is an outer header present that might contain a checksum + * we need to bump the checksum level by 1 to reflect the fact that + * we are indicating we validated the inner checksum. + */ + if (decoded.tunnel_type >= LIBETH_RX_PT_TUNNEL_IP_GRENAT) + skb->csum_level = 1; + + skb->ip_summed = CHECKSUM_UNNECESSARY; + return; + +checksum_fail: + ring->vsi->back->hw_csum_rx_error++; +} + +/** + * ice_ptp_rx_hwts_to_skb - Put RX timestamp into skb + * @rx_ring: Ring to get the VSI info + * @rx_desc: Receive descriptor + * @skb: Particular skb to send timestamp with + * + * The timestamp is in ns, so we must convert the result first. + */ +static void +ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring, + const union ice_32b_rx_flex_desc *rx_desc, + struct sk_buff *skb) +{ + u64 ts_ns = ice_ptp_get_rx_hwts(rx_desc, &rx_ring->pkt_ctx); + + skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ts_ns); +} + +/** + * ice_get_ptype - Read HW packet type from the descriptor + * @rx_desc: RX descriptor + */ +static u16 ice_get_ptype(const union ice_32b_rx_flex_desc *rx_desc) +{ + return le16_to_cpu(rx_desc->wb.ptype_flex_flags0) & + ICE_RX_FLEX_DESC_PTYPE_M; +} + +/** + * ice_process_skb_fields - Populate skb header fields from Rx descriptor + * @rx_ring: Rx descriptor ring packet is being transacted on + * @rx_desc: pointer to the EOP Rx descriptor + * @skb: pointer to current skb being populated + * + * This function checks the ring, descriptor, and packet information in + * order to populate the hash, checksum, VLAN, protocol, and + * other fields within the skb. + */ +void +ice_process_skb_fields(struct ice_rx_ring *rx_ring, + union ice_32b_rx_flex_desc *rx_desc, + struct sk_buff *skb) +{ + u16 ptype = ice_get_ptype(rx_desc); + + ice_rx_hash_to_skb(rx_ring, rx_desc, skb, ptype); + + /* modifies the skb - consumes the enet header */ + if (unlikely(rx_ring->flags & ICE_RX_FLAGS_MULTIDEV)) { + struct net_device *netdev = ice_eswitch_get_target(rx_ring, + rx_desc); + + if (ice_is_port_repr_netdev(netdev)) + ice_repr_inc_rx_stats(netdev, skb->len); + + /* __skb_push() is needed because xdp_build_skb_from_buff() + * calls eth_type_trans() + */ + __skb_push(skb, ETH_HLEN); + skb->protocol = eth_type_trans(skb, netdev); + } + + ice_rx_csum(rx_ring, skb, rx_desc, ptype); + + if (rx_ring->ptp_rx) + ice_ptp_rx_hwts_to_skb(rx_ring, rx_desc, skb); +} + +/** + * ice_receive_skb - Send a completed packet up the stack + * @rx_ring: Rx ring in play + * @skb: packet to send up + * @vlan_tci: VLAN TCI for packet + * + * This function sends the completed packet (via. skb) up the stack using + * gro receive functions (with/without VLAN tag) + */ +void +ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tci) +{ + if ((vlan_tci & VLAN_VID_MASK) && rx_ring->vlan_proto) + __vlan_hwaccel_put_tag(skb, rx_ring->vlan_proto, + vlan_tci); + + napi_gro_receive(&rx_ring->q_vector->napi, skb); +} + +/** + * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer + * @dev: device for DMA mapping + * @tx_buf: Tx buffer to clean + * @bq: XDP bulk flush struct + */ +static void +ice_clean_xdp_tx_buf(struct device *dev, struct ice_tx_buf *tx_buf, + struct xdp_frame_bulk *bq) +{ + switch (tx_buf->type) { + case ICE_TX_BUF_XDP_TX: + libeth_xdp_return_va(tx_buf->raw_buf, true); + break; + case ICE_TX_BUF_XDP_XMIT: + dma_unmap_single(dev, dma_unmap_addr(tx_buf, dma), + dma_unmap_len(tx_buf, len), DMA_TO_DEVICE); + xdp_return_frame_bulk(tx_buf->xdpf, bq); + break; + } + + dma_unmap_len_set(tx_buf, len, 0); + tx_buf->type = ICE_TX_BUF_EMPTY; +} + +/** + * ice_clean_xdp_irq - Reclaim resources after transmit completes on XDP ring + * @xdp_ring: XDP ring to clean + */ +static u32 ice_clean_xdp_irq(struct ice_tx_ring *xdp_ring) +{ + int total_bytes = 0, total_pkts = 0; + struct device *dev = xdp_ring->dev; + u32 ntc = xdp_ring->next_to_clean; + struct ice_tx_desc *tx_desc; + u32 cnt = xdp_ring->count; + struct xdp_frame_bulk bq; + u32 frags, xdp_tx = 0; + u32 ready_frames = 0; + u32 idx; + u32 ret; + + idx = xdp_ring->tx_buf[ntc].rs_idx; + tx_desc = ICE_TX_DESC(xdp_ring, idx); + if (tx_desc->cmd_type_offset_bsz & + cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)) { + if (idx >= ntc) + ready_frames = idx - ntc + 1; + else + ready_frames = idx + cnt - ntc + 1; + } + + if (unlikely(!ready_frames)) + return 0; + ret = ready_frames; + + xdp_frame_bulk_init(&bq); + rcu_read_lock(); /* xdp_return_frame_bulk() */ + + while (ready_frames) { + struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[ntc]; + struct ice_tx_buf *head = tx_buf; + + /* bytecount holds size of head + frags */ + total_bytes += tx_buf->bytecount; + frags = tx_buf->nr_frags; + total_pkts++; + /* count head + frags */ + ready_frames -= frags + 1; + xdp_tx++; + + ntc++; + if (ntc == cnt) + ntc = 0; + + for (int i = 0; i < frags; i++) { + tx_buf = &xdp_ring->tx_buf[ntc]; + + ice_clean_xdp_tx_buf(dev, tx_buf, &bq); + ntc++; + if (ntc == cnt) + ntc = 0; + } + + ice_clean_xdp_tx_buf(dev, head, &bq); + } + + xdp_flush_frame_bulk(&bq); + rcu_read_unlock(); + + tx_desc->cmd_type_offset_bsz = 0; + xdp_ring->next_to_clean = ntc; + xdp_ring->xdp_tx_active -= xdp_tx; + ice_update_tx_ring_stats(xdp_ring, total_pkts, total_bytes); + + return ret; +} + +/** + * __ice_xmit_xdp_ring - submit frame to XDP ring for transmission + * @xdp: XDP buffer to be placed onto Tx descriptors + * @xdp_ring: XDP ring for transmission + * @frame: whether this comes from .ndo_xdp_xmit() + */ +int __ice_xmit_xdp_ring(struct xdp_buff *xdp, struct ice_tx_ring *xdp_ring, + bool frame) +{ + struct skb_shared_info *sinfo = NULL; + u32 size = xdp->data_end - xdp->data; + struct device *dev = xdp_ring->dev; + u32 ntu = xdp_ring->next_to_use; + struct ice_tx_desc *tx_desc; + struct ice_tx_buf *tx_head; + struct ice_tx_buf *tx_buf; + u32 cnt = xdp_ring->count; + void *data = xdp->data; + struct page *page; + u32 nr_frags = 0; + u32 free_space; + u32 frag = 0; + u32 offset; + + free_space = ICE_DESC_UNUSED(xdp_ring); + if (free_space < ICE_RING_QUARTER(xdp_ring)) + free_space += ice_clean_xdp_irq(xdp_ring); + + if (unlikely(!free_space)) + goto busy; + + if (unlikely(xdp_buff_has_frags(xdp))) { + sinfo = xdp_get_shared_info_from_buff(xdp); + nr_frags = sinfo->nr_frags; + if (free_space < nr_frags + 1) + goto busy; + } + + tx_desc = ICE_TX_DESC(xdp_ring, ntu); + tx_head = &xdp_ring->tx_buf[ntu]; + tx_buf = tx_head; + + page = virt_to_page(data); + offset = offset_in_page(xdp->data); + + for (;;) { + dma_addr_t dma; + + if (frame) { + dma = dma_map_single(dev, data, size, DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma)) + goto dma_unmap; + tx_buf->type = ICE_TX_BUF_FRAG; + } else { + dma = page_pool_get_dma_addr(page) + offset; + dma_sync_single_for_device(dev, dma, size, DMA_BIDIRECTIONAL); + tx_buf->type = ICE_TX_BUF_XDP_TX; + tx_buf->raw_buf = data; + } + + /* record length, and DMA address */ + dma_unmap_len_set(tx_buf, len, size); + dma_unmap_addr_set(tx_buf, dma, dma); + + tx_desc->buf_addr = cpu_to_le64(dma); + tx_desc->cmd_type_offset_bsz = ice_build_ctob(0, 0, size, 0); + + ntu++; + if (ntu == cnt) + ntu = 0; + + if (frag == nr_frags) + break; + + tx_desc = ICE_TX_DESC(xdp_ring, ntu); + tx_buf = &xdp_ring->tx_buf[ntu]; + + page = skb_frag_page(&sinfo->frags[frag]); + offset = skb_frag_off(&sinfo->frags[frag]); + data = skb_frag_address(&sinfo->frags[frag]); + size = skb_frag_size(&sinfo->frags[frag]); + frag++; + } + + /* store info about bytecount and frag count in first desc */ + tx_head->bytecount = xdp_get_buff_len(xdp); + tx_head->nr_frags = nr_frags; + + if (frame) { + tx_head->type = ICE_TX_BUF_XDP_XMIT; + tx_head->xdpf = xdp->data_hard_start; + } + + /* update last descriptor from a frame with EOP */ + tx_desc->cmd_type_offset_bsz |= + cpu_to_le64(ICE_TX_DESC_CMD_EOP << ICE_TXD_QW1_CMD_S); + + xdp_ring->xdp_tx_active++; + xdp_ring->next_to_use = ntu; + + return ICE_XDP_TX; + +dma_unmap: + for (;;) { + tx_buf = &xdp_ring->tx_buf[ntu]; + dma_unmap_page(dev, dma_unmap_addr(tx_buf, dma), + dma_unmap_len(tx_buf, len), DMA_TO_DEVICE); + dma_unmap_len_set(tx_buf, len, 0); + if (tx_buf == tx_head) + break; + + if (!ntu) + ntu += cnt; + ntu--; + } + return ICE_XDP_CONSUMED; + +busy: + xdp_ring->ring_stats->tx_stats.tx_busy++; + + return ICE_XDP_CONSUMED; +} + +/** + * ice_finalize_xdp_rx - Bump XDP Tx tail and/or flush redirect map + * @xdp_ring: XDP ring + * @xdp_res: Result of the receive batch + * @first_idx: index to write from caller + * + * This function bumps XDP Tx tail and/or flush redirect map, and + * should be called when a batch of packets has been processed in the + * napi loop. + */ +void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res, + u32 first_idx) +{ + struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[first_idx]; + + if (xdp_res & ICE_XDP_REDIR) + xdp_do_flush(); + + if (xdp_res & ICE_XDP_TX) { + if (static_branch_unlikely(&ice_xdp_locking_key)) + spin_lock(&xdp_ring->tx_lock); + /* store index of descriptor with RS bit set in the first + * ice_tx_buf of given NAPI batch + */ + tx_buf->rs_idx = ice_set_rs_bit(xdp_ring); + ice_xdp_ring_update_tail(xdp_ring); + if (static_branch_unlikely(&ice_xdp_locking_key)) + spin_unlock(&xdp_ring->tx_lock); + } +} + +/** + * ice_xdp_rx_hw_ts - HW timestamp XDP hint handler + * @ctx: XDP buff pointer + * @ts_ns: destination address + * + * Copy HW timestamp (if available) to the destination address. + */ +static int ice_xdp_rx_hw_ts(const struct xdp_md *ctx, u64 *ts_ns) +{ + const struct libeth_xdp_buff *xdp_ext = (void *)ctx; + struct ice_rx_ring *rx_ring; + + rx_ring = libeth_xdp_buff_to_rq(xdp_ext, typeof(*rx_ring), xdp_rxq); + + *ts_ns = ice_ptp_get_rx_hwts(xdp_ext->desc, + &rx_ring->pkt_ctx); + if (!*ts_ns) + return -ENODATA; + + return 0; +} + +/** + * ice_xdp_rx_hash_type - Get XDP-specific hash type from the RX descriptor + * @eop_desc: End of Packet descriptor + */ +static enum xdp_rss_hash_type +ice_xdp_rx_hash_type(const union ice_32b_rx_flex_desc *eop_desc) +{ + return libie_rx_pt_parse(ice_get_ptype(eop_desc)).hash_type; +} + +/** + * ice_xdp_rx_hash - RX hash XDP hint handler + * @ctx: XDP buff pointer + * @hash: hash destination address + * @rss_type: XDP hash type destination address + * + * Copy RX hash (if available) and its type to the destination address. + */ +static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash, + enum xdp_rss_hash_type *rss_type) +{ + const struct libeth_xdp_buff *xdp_ext = (void *)ctx; + + *hash = ice_get_rx_hash(xdp_ext->desc); + *rss_type = ice_xdp_rx_hash_type(xdp_ext->desc); + if (!likely(*hash)) + return -ENODATA; + + return 0; +} + +/** + * ice_xdp_rx_vlan_tag - VLAN tag XDP hint handler + * @ctx: XDP buff pointer + * @vlan_proto: destination address for VLAN protocol + * @vlan_tci: destination address for VLAN TCI + * + * Copy VLAN tag (if was stripped) and corresponding protocol + * to the destination address. + */ +static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, __be16 *vlan_proto, + u16 *vlan_tci) +{ + const struct libeth_xdp_buff *xdp_ext = (void *)ctx; + struct ice_rx_ring *rx_ring; + + rx_ring = libeth_xdp_buff_to_rq(xdp_ext, typeof(*rx_ring), xdp_rxq); + + *vlan_proto = rx_ring->pkt_ctx.vlan_proto; + if (!*vlan_proto) + return -ENODATA; + + *vlan_tci = ice_get_vlan_tci(xdp_ext->desc); + if (!*vlan_tci) + return -ENODATA; + + return 0; +} + +const struct xdp_metadata_ops ice_xdp_md_ops = { + .xmo_rx_timestamp = ice_xdp_rx_hw_ts, + .xmo_rx_hash = ice_xdp_rx_hash, + .xmo_rx_vlan_tag = ice_xdp_rx_vlan_tag, +}; 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