diff options
Diffstat (limited to 'drivers/net/ethernet/intel/i40e/i40e_xsk.c')
| -rw-r--r-- | drivers/net/ethernet/intel/i40e/i40e_xsk.c | 818 |
1 files changed, 818 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c new file mode 100644 index 000000000..1f8ae6f5d --- /dev/null +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c @@ -0,0 +1,818 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2018 Intel Corporation. */ + +#include <linux/bpf_trace.h> +#include <linux/stringify.h> +#include <net/xdp_sock_drv.h> +#include <net/xdp.h> + +#include "i40e.h" +#include "i40e_txrx_common.h" +#include "i40e_xsk.h" + +void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring) +{ + memset(rx_ring->rx_bi_zc, 0, + sizeof(*rx_ring->rx_bi_zc) * rx_ring->count); +} + +static struct xdp_buff **i40e_rx_bi(struct i40e_ring *rx_ring, u32 idx) +{ + return &rx_ring->rx_bi_zc[idx]; +} + +/** + * i40e_realloc_rx_xdp_bi - reallocate SW ring for either XSK or normal buffer + * @rx_ring: Current 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 i40e_realloc_rx_xdp_bi(struct i40e_ring *rx_ring, bool pool_present) +{ + size_t elem_size = pool_present ? sizeof(*rx_ring->rx_bi_zc) : + sizeof(*rx_ring->rx_bi); + void *sw_ring = kcalloc(rx_ring->count, elem_size, GFP_KERNEL); + + if (!sw_ring) + return -ENOMEM; + + if (pool_present) { + kfree(rx_ring->rx_bi); + rx_ring->rx_bi = NULL; + rx_ring->rx_bi_zc = sw_ring; + } else { + kfree(rx_ring->rx_bi_zc); + rx_ring->rx_bi_zc = NULL; + rx_ring->rx_bi = sw_ring; + } + return 0; +} + +/** + * i40e_realloc_rx_bi_zc - reallocate rx SW rings + * @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 i40e_realloc_rx_bi_zc(struct i40e_vsi *vsi, bool zc) +{ + struct i40e_ring *rx_ring; + unsigned long q; + + for_each_set_bit(q, vsi->af_xdp_zc_qps, vsi->alloc_queue_pairs) { + rx_ring = vsi->rx_rings[q]; + if (i40e_realloc_rx_xdp_bi(rx_ring, zc)) + return -ENOMEM; + } + return 0; +} + +/** + * i40e_xsk_pool_enable - Enable/associate an AF_XDP buffer pool to a + * certain ring/qid + * @vsi: Current VSI + * @pool: buffer pool + * @qid: Rx ring to associate buffer pool with + * + * Returns 0 on success, <0 on failure + **/ +static int i40e_xsk_pool_enable(struct i40e_vsi *vsi, + struct xsk_buff_pool *pool, + u16 qid) +{ + struct net_device *netdev = vsi->netdev; + bool if_running; + int err; + + if (vsi->type != I40E_VSI_MAIN) + return -EINVAL; + + if (qid >= vsi->num_queue_pairs) + return -EINVAL; + + if (qid >= netdev->real_num_rx_queues || + qid >= netdev->real_num_tx_queues) + return -EINVAL; + + err = xsk_pool_dma_map(pool, &vsi->back->pdev->dev, I40E_RX_DMA_ATTR); + if (err) + return err; + + set_bit(qid, vsi->af_xdp_zc_qps); + + if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi); + + if (if_running) { + err = i40e_queue_pair_disable(vsi, qid); + if (err) + return err; + + err = i40e_realloc_rx_xdp_bi(vsi->rx_rings[qid], true); + if (err) + return err; + + err = i40e_queue_pair_enable(vsi, qid); + if (err) + return err; + + /* Kick start the NAPI context so that receiving will start */ + err = i40e_xsk_wakeup(vsi->netdev, qid, XDP_WAKEUP_RX); + if (err) + return err; + } + + return 0; +} + +/** + * i40e_xsk_pool_disable - Disassociate an AF_XDP buffer pool from a + * certain ring/qid + * @vsi: Current VSI + * @qid: Rx ring to associate buffer pool with + * + * Returns 0 on success, <0 on failure + **/ +static int i40e_xsk_pool_disable(struct i40e_vsi *vsi, u16 qid) +{ + struct net_device *netdev = vsi->netdev; + struct xsk_buff_pool *pool; + bool if_running; + int err; + + pool = xsk_get_pool_from_qid(netdev, qid); + if (!pool) + return -EINVAL; + + if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi); + + if (if_running) { + err = i40e_queue_pair_disable(vsi, qid); + if (err) + return err; + } + + clear_bit(qid, vsi->af_xdp_zc_qps); + xsk_pool_dma_unmap(pool, I40E_RX_DMA_ATTR); + + if (if_running) { + err = i40e_realloc_rx_xdp_bi(vsi->rx_rings[qid], false); + if (err) + return err; + err = i40e_queue_pair_enable(vsi, qid); + if (err) + return err; + } + + return 0; +} + +/** + * i40e_xsk_pool_setup - Enable/disassociate an AF_XDP buffer pool to/from + * a ring/qid + * @vsi: Current VSI + * @pool: Buffer pool to enable/associate to a ring, or NULL to disable + * @qid: Rx ring to (dis)associate buffer pool (from)to + * + * This function enables or disables a buffer pool to a certain ring. + * + * Returns 0 on success, <0 on failure + **/ +int i40e_xsk_pool_setup(struct i40e_vsi *vsi, struct xsk_buff_pool *pool, + u16 qid) +{ + return pool ? i40e_xsk_pool_enable(vsi, pool, qid) : + i40e_xsk_pool_disable(vsi, qid); +} + +/** + * i40e_run_xdp_zc - Executes an XDP program on an xdp_buff + * @rx_ring: Rx ring + * @xdp: xdp_buff used as input to the XDP program + * @xdp_prog: XDP program to run + * + * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR} + **/ +static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp, + struct bpf_prog *xdp_prog) +{ + int err, result = I40E_XDP_PASS; + struct i40e_ring *xdp_ring; + 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 I40E_XDP_REDIR; + if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS) + result = I40E_XDP_EXIT; + else + result = I40E_XDP_CONSUMED; + goto out_failure; + } + + switch (act) { + case XDP_PASS: + break; + case XDP_TX: + xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index]; + result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring); + if (result == I40E_XDP_CONSUMED) + goto out_failure; + break; + case XDP_DROP: + result = I40E_XDP_CONSUMED; + break; + default: + bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act); + fallthrough; + case XDP_ABORTED: + result = I40E_XDP_CONSUMED; +out_failure: + trace_xdp_exception(rx_ring->netdev, xdp_prog, act); + } + return result; +} + +bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count) +{ + u16 ntu = rx_ring->next_to_use; + union i40e_rx_desc *rx_desc; + struct xdp_buff **xdp; + u32 nb_buffs, i; + dma_addr_t dma; + + rx_desc = I40E_RX_DESC(rx_ring, ntu); + xdp = i40e_rx_bi(rx_ring, ntu); + + nb_buffs = min_t(u16, count, rx_ring->count - ntu); + nb_buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, nb_buffs); + if (!nb_buffs) + return false; + + i = nb_buffs; + while (i--) { + dma = xsk_buff_xdp_get_dma(*xdp); + rx_desc->read.pkt_addr = cpu_to_le64(dma); + rx_desc->read.hdr_addr = 0; + + rx_desc++; + xdp++; + } + + ntu += nb_buffs; + if (ntu == rx_ring->count) { + rx_desc = I40E_RX_DESC(rx_ring, 0); + ntu = 0; + } + + /* clear the status bits for the next_to_use descriptor */ + rx_desc->wb.qword1.status_error_len = 0; + i40e_release_rx_desc(rx_ring, ntu); + + return count == nb_buffs; +} + +/** + * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer + * @rx_ring: Rx ring + * @xdp: xdp_buff + * + * This functions allocates a new skb from a zero-copy Rx buffer. + * + * Returns the skb, or NULL on failure. + **/ +static struct sk_buff *i40e_construct_skb_zc(struct i40e_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 skb_shared_info *sinfo = NULL; + struct sk_buff *skb; + u32 nr_frags = 0; + + if (unlikely(xdp_buff_has_frags(xdp))) { + sinfo = xdp_get_shared_info_from_buff(xdp); + nr_frags = sinfo->nr_frags; + } + net_prefetch(xdp->data_meta); + + /* allocate a skb to store the frags */ + skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize, + GFP_ATOMIC | __GFP_NOWARN); + if (unlikely(!skb)) + goto out; + + memcpy(__skb_put(skb, totalsize), xdp->data_meta, + ALIGN(totalsize, sizeof(long))); + + if (metasize) { + skb_metadata_set(skb, metasize); + __skb_pull(skb, metasize); + } + + if (likely(!xdp_buff_has_frags(xdp))) + goto out; + + for (int i = 0; i < nr_frags; i++) { + struct skb_shared_info *skinfo = skb_shinfo(skb); + skb_frag_t *frag = &sinfo->frags[i]; + struct page *page; + void *addr; + + page = dev_alloc_page(); + if (!page) { + dev_kfree_skb(skb); + return NULL; + } + addr = page_to_virt(page); + + memcpy(addr, skb_frag_page(frag), skb_frag_size(frag)); + + __skb_fill_page_desc_noacc(skinfo, skinfo->nr_frags++, + addr, 0, skb_frag_size(frag)); + } + +out: + xsk_buff_free(xdp); + return skb; +} + +static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring, + struct xdp_buff *xdp_buff, + union i40e_rx_desc *rx_desc, + unsigned int *rx_packets, + unsigned int *rx_bytes, + unsigned int xdp_res, + bool *failure) +{ + struct sk_buff *skb; + + *rx_packets = 1; + *rx_bytes = xdp_get_buff_len(xdp_buff); + + if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX) + return; + + if (xdp_res == I40E_XDP_EXIT) { + *failure = true; + return; + } + + if (xdp_res == I40E_XDP_CONSUMED) { + xsk_buff_free(xdp_buff); + return; + } + if (xdp_res == I40E_XDP_PASS) { + /* NB! We are not checking for errors using + * i40e_test_staterr with + * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that + * SBP is *not* set in PRT_SBPVSI (default not set). + */ + skb = i40e_construct_skb_zc(rx_ring, xdp_buff); + if (!skb) { + rx_ring->rx_stats.alloc_buff_failed++; + *rx_packets = 0; + *rx_bytes = 0; + return; + } + + if (eth_skb_pad(skb)) { + *rx_packets = 0; + *rx_bytes = 0; + return; + } + + i40e_process_skb_fields(rx_ring, rx_desc, skb); + napi_gro_receive(&rx_ring->q_vector->napi, skb); + return; + } + + /* Should never get here, as all valid cases have been handled already. + */ + WARN_ON_ONCE(1); +} + +static int +i40e_add_xsk_frag(struct i40e_ring *rx_ring, struct xdp_buff *first, + struct xdp_buff *xdp, const unsigned int size) +{ + struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(first); + + if (!xdp_buff_has_frags(first)) { + sinfo->nr_frags = 0; + sinfo->xdp_frags_size = 0; + xdp_buff_set_frags_flag(first); + } + + if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) { + xsk_buff_free(first); + return -ENOMEM; + } + + __skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++, + virt_to_page(xdp->data_hard_start), + XDP_PACKET_HEADROOM, size); + sinfo->xdp_frags_size += size; + xsk_buff_add_frag(xdp); + + return 0; +} + +/** + * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring + * @rx_ring: Rx ring + * @budget: NAPI budget + * + * Returns amount of work completed + **/ +int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget) +{ + unsigned int total_rx_bytes = 0, total_rx_packets = 0; + u16 next_to_process = rx_ring->next_to_process; + u16 next_to_clean = rx_ring->next_to_clean; + unsigned int xdp_res, xdp_xmit = 0; + struct xdp_buff *first = NULL; + u32 count = rx_ring->count; + struct bpf_prog *xdp_prog; + u32 entries_to_alloc; + bool failure = false; + + if (next_to_process != next_to_clean) + first = *i40e_rx_bi(rx_ring, next_to_clean); + + /* NB! xdp_prog will always be !NULL, due to the fact that + * this path is enabled by setting an XDP program. + */ + xdp_prog = READ_ONCE(rx_ring->xdp_prog); + + while (likely(total_rx_packets < (unsigned int)budget)) { + union i40e_rx_desc *rx_desc; + unsigned int rx_packets; + unsigned int rx_bytes; + struct xdp_buff *bi; + unsigned int size; + u64 qword; + + rx_desc = I40E_RX_DESC(rx_ring, next_to_process); + qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); + + /* 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 (i40e_rx_is_programming_status(qword)) { + i40e_clean_programming_status(rx_ring, + rx_desc->raw.qword[0], + qword); + bi = *i40e_rx_bi(rx_ring, next_to_process); + xsk_buff_free(bi); + if (++next_to_process == count) + next_to_process = 0; + continue; + } + + size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >> + I40E_RXD_QW1_LENGTH_PBUF_SHIFT; + if (!size) + break; + + bi = *i40e_rx_bi(rx_ring, next_to_process); + xsk_buff_set_size(bi, size); + xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool); + + if (!first) + first = bi; + else if (i40e_add_xsk_frag(rx_ring, first, bi, size)) + break; + + if (++next_to_process == count) + next_to_process = 0; + + if (i40e_is_non_eop(rx_ring, rx_desc)) + continue; + + xdp_res = i40e_run_xdp_zc(rx_ring, first, xdp_prog); + i40e_handle_xdp_result_zc(rx_ring, first, rx_desc, &rx_packets, + &rx_bytes, xdp_res, &failure); + next_to_clean = next_to_process; + if (failure) + break; + total_rx_packets += rx_packets; + total_rx_bytes += rx_bytes; + xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR); + first = NULL; + } + + rx_ring->next_to_clean = next_to_clean; + rx_ring->next_to_process = next_to_process; + + entries_to_alloc = I40E_DESC_UNUSED(rx_ring); + if (entries_to_alloc >= I40E_RX_BUFFER_WRITE) + failure |= !i40e_alloc_rx_buffers_zc(rx_ring, entries_to_alloc); + + i40e_finalize_xdp_rx(rx_ring, xdp_xmit); + i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets); + + if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) { + if (failure || 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; +} + +static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc, + unsigned int *total_bytes) +{ + u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(desc); + struct i40e_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 = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++); + tx_desc->buffer_addr = cpu_to_le64(dma); + tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc->len, 0); + + *total_bytes += desc->len; +} + +static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc, + unsigned int *total_bytes) +{ + u16 ntu = xdp_ring->next_to_use; + struct i40e_tx_desc *tx_desc; + dma_addr_t dma; + u32 i; + + loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) { + u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(&desc[i]); + + dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr); + xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len); + + tx_desc = I40E_TX_DESC(xdp_ring, ntu++); + tx_desc->buffer_addr = cpu_to_le64(dma); + tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc[i].len, 0); + + *total_bytes += desc[i].len; + } + + xdp_ring->next_to_use = ntu; +} + +static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts, + unsigned int *total_bytes) +{ + u32 batched, leftover, i; + + batched = nb_pkts & ~(PKTS_PER_BATCH - 1); + leftover = nb_pkts & (PKTS_PER_BATCH - 1); + for (i = 0; i < batched; i += PKTS_PER_BATCH) + i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes); + for (i = batched; i < batched + leftover; i++) + i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes); +} + +static void i40e_set_rs_bit(struct i40e_ring *xdp_ring) +{ + u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1; + struct i40e_tx_desc *tx_desc; + + tx_desc = I40E_TX_DESC(xdp_ring, ntu); + tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT); +} + +/** + * i40e_xmit_zc - Performs zero-copy Tx AF_XDP + * @xdp_ring: XDP Tx ring + * @budget: NAPI budget + * + * Returns true if the work is finished. + **/ +static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget) +{ + struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs; + u32 nb_pkts, nb_processed = 0; + unsigned int total_bytes = 0; + + 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) { + nb_processed = xdp_ring->count - xdp_ring->next_to_use; + i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes); + xdp_ring->next_to_use = 0; + } + + i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed, + &total_bytes); + + /* Request an interrupt for the last frame and bump tail ptr. */ + i40e_set_rs_bit(xdp_ring); + i40e_xdp_ring_update_tail(xdp_ring); + + i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes); + + return nb_pkts < budget; +} + +/** + * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry + * @tx_ring: XDP Tx ring + * @tx_bi: Tx buffer info to clean + **/ +static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring, + struct i40e_tx_buffer *tx_bi) +{ + xdp_return_frame(tx_bi->xdpf); + tx_ring->xdp_tx_active--; + dma_unmap_single(tx_ring->dev, + dma_unmap_addr(tx_bi, dma), + dma_unmap_len(tx_bi, len), DMA_TO_DEVICE); + dma_unmap_len_set(tx_bi, len, 0); +} + +/** + * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries + * @vsi: Current VSI + * @tx_ring: XDP Tx ring + * + * Returns true if cleanup/transmission is done. + **/ +bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring) +{ + struct xsk_buff_pool *bp = tx_ring->xsk_pool; + u32 i, completed_frames, xsk_frames = 0; + u32 head_idx = i40e_get_head(tx_ring); + struct i40e_tx_buffer *tx_bi; + unsigned int ntc; + + if (head_idx < tx_ring->next_to_clean) + head_idx += tx_ring->count; + completed_frames = head_idx - tx_ring->next_to_clean; + + if (completed_frames == 0) + goto out_xmit; + + if (likely(!tx_ring->xdp_tx_active)) { + xsk_frames = completed_frames; + goto skip; + } + + ntc = tx_ring->next_to_clean; + + for (i = 0; i < completed_frames; i++) { + tx_bi = &tx_ring->tx_bi[ntc]; + + if (tx_bi->xdpf) { + i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); + tx_bi->xdpf = NULL; + } else { + xsk_frames++; + } + + if (++ntc >= tx_ring->count) + ntc = 0; + } + +skip: + tx_ring->next_to_clean += completed_frames; + if (unlikely(tx_ring->next_to_clean >= tx_ring->count)) + tx_ring->next_to_clean -= tx_ring->count; + + if (xsk_frames) + xsk_tx_completed(bp, xsk_frames); + + i40e_arm_wb(tx_ring, vsi, completed_frames); + +out_xmit: + if (xsk_uses_need_wakeup(tx_ring->xsk_pool)) + xsk_set_tx_need_wakeup(tx_ring->xsk_pool); + + return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring)); +} + +/** + * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup + * @dev: the netdevice + * @queue_id: queue id to wake up + * @flags: ignored in our case since we have Rx and Tx in the same NAPI. + * + * Returns <0 for errors, 0 otherwise. + **/ +int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags) +{ + struct i40e_netdev_priv *np = netdev_priv(dev); + struct i40e_vsi *vsi = np->vsi; + struct i40e_pf *pf = vsi->back; + struct i40e_ring *ring; + + if (test_bit(__I40E_CONFIG_BUSY, pf->state)) + return -EAGAIN; + + if (test_bit(__I40E_VSI_DOWN, vsi->state)) + return -ENETDOWN; + + if (!i40e_enabled_xdp_vsi(vsi)) + return -EINVAL; + + if (queue_id >= vsi->num_queue_pairs) + return -EINVAL; + + if (!vsi->xdp_rings[queue_id]->xsk_pool) + return -EINVAL; + + ring = vsi->xdp_rings[queue_id]; + + /* 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. + */ + if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) + i40e_force_wb(vsi, ring->q_vector); + + return 0; +} + +void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring) +{ + u16 ntc = rx_ring->next_to_clean; + u16 ntu = rx_ring->next_to_use; + + while (ntc != ntu) { + struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc); + + xsk_buff_free(rx_bi); + ntc++; + if (ntc >= rx_ring->count) + ntc = 0; + } +} + +/** + * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown + * @tx_ring: XDP Tx ring + **/ +void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring) +{ + u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use; + struct xsk_buff_pool *bp = tx_ring->xsk_pool; + struct i40e_tx_buffer *tx_bi; + u32 xsk_frames = 0; + + while (ntc != ntu) { + tx_bi = &tx_ring->tx_bi[ntc]; + + if (tx_bi->xdpf) + i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); + else + xsk_frames++; + + tx_bi->xdpf = NULL; + + ntc++; + if (ntc >= tx_ring->count) + ntc = 0; + } + + if (xsk_frames) + xsk_tx_completed(bp, xsk_frames); +} + +/** + * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP + * buffer pool attached + * @vsi: vsi + * + * Returns true if any of the Rx rings has an AF_XDP buffer pool attached + **/ +bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi) +{ + struct net_device *netdev = vsi->netdev; + int i; + + for (i = 0; i < vsi->num_queue_pairs; i++) { + if (xsk_get_pool_from_qid(netdev, i)) + return true; + } + + return false; +} |