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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c')
-rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c new file mode 100644 index 0000000000..1703c640a4 --- /dev/null +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c @@ -0,0 +1,574 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2018 Intel Corporation. */ + +#include <linux/bpf_trace.h> +#include <net/xdp_sock_drv.h> +#include <net/xdp.h> + +#include "ixgbe.h" +#include "ixgbe_txrx_common.h" + +struct xsk_buff_pool *ixgbe_xsk_pool(struct ixgbe_adapter *adapter, + struct ixgbe_ring *ring) +{ + bool xdp_on = READ_ONCE(adapter->xdp_prog); + int qid = ring->ring_idx; + + if (!xdp_on || !test_bit(qid, adapter->af_xdp_zc_qps)) + return NULL; + + return xsk_get_pool_from_qid(adapter->netdev, qid); +} + +static int ixgbe_xsk_pool_enable(struct ixgbe_adapter *adapter, + struct xsk_buff_pool *pool, + u16 qid) +{ + struct net_device *netdev = adapter->netdev; + bool if_running; + int err; + + if (qid >= adapter->num_rx_queues) + return -EINVAL; + + if (qid >= netdev->real_num_rx_queues || + qid >= netdev->real_num_tx_queues) + return -EINVAL; + + err = xsk_pool_dma_map(pool, &adapter->pdev->dev, IXGBE_RX_DMA_ATTR); + if (err) + return err; + + if_running = netif_running(adapter->netdev) && + ixgbe_enabled_xdp_adapter(adapter); + + if (if_running) + ixgbe_txrx_ring_disable(adapter, qid); + + set_bit(qid, adapter->af_xdp_zc_qps); + + if (if_running) { + ixgbe_txrx_ring_enable(adapter, qid); + + /* Kick start the NAPI context so that receiving will start */ + err = ixgbe_xsk_wakeup(adapter->netdev, qid, XDP_WAKEUP_RX); + if (err) { + clear_bit(qid, adapter->af_xdp_zc_qps); + xsk_pool_dma_unmap(pool, IXGBE_RX_DMA_ATTR); + return err; + } + } + + return 0; +} + +static int ixgbe_xsk_pool_disable(struct ixgbe_adapter *adapter, u16 qid) +{ + struct xsk_buff_pool *pool; + bool if_running; + + pool = xsk_get_pool_from_qid(adapter->netdev, qid); + if (!pool) + return -EINVAL; + + if_running = netif_running(adapter->netdev) && + ixgbe_enabled_xdp_adapter(adapter); + + if (if_running) + ixgbe_txrx_ring_disable(adapter, qid); + + clear_bit(qid, adapter->af_xdp_zc_qps); + xsk_pool_dma_unmap(pool, IXGBE_RX_DMA_ATTR); + + if (if_running) + ixgbe_txrx_ring_enable(adapter, qid); + + return 0; +} + +int ixgbe_xsk_pool_setup(struct ixgbe_adapter *adapter, + struct xsk_buff_pool *pool, + u16 qid) +{ + return pool ? ixgbe_xsk_pool_enable(adapter, pool, qid) : + ixgbe_xsk_pool_disable(adapter, qid); +} + +static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter, + struct ixgbe_ring *rx_ring, + struct xdp_buff *xdp) +{ + int err, result = IXGBE_XDP_PASS; + struct bpf_prog *xdp_prog; + struct ixgbe_ring *ring; + struct xdp_frame *xdpf; + u32 act; + + xdp_prog = READ_ONCE(rx_ring->xdp_prog); + 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 IXGBE_XDP_REDIR; + if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS) + result = IXGBE_XDP_EXIT; + else + result = IXGBE_XDP_CONSUMED; + goto out_failure; + } + + switch (act) { + case XDP_PASS: + break; + case XDP_TX: + xdpf = xdp_convert_buff_to_frame(xdp); + if (unlikely(!xdpf)) + goto out_failure; + ring = ixgbe_determine_xdp_ring(adapter); + if (static_branch_unlikely(&ixgbe_xdp_locking_key)) + spin_lock(&ring->tx_lock); + result = ixgbe_xmit_xdp_ring(ring, xdpf); + if (static_branch_unlikely(&ixgbe_xdp_locking_key)) + spin_unlock(&ring->tx_lock); + if (result == IXGBE_XDP_CONSUMED) + goto out_failure; + break; + case XDP_DROP: + result = IXGBE_XDP_CONSUMED; + break; + default: + bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act); + fallthrough; + case XDP_ABORTED: + result = IXGBE_XDP_CONSUMED; +out_failure: + trace_xdp_exception(rx_ring->netdev, xdp_prog, act); + } + return result; +} + +bool ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 count) +{ + union ixgbe_adv_rx_desc *rx_desc; + struct ixgbe_rx_buffer *bi; + u16 i = rx_ring->next_to_use; + dma_addr_t dma; + bool ok = true; + + /* nothing to do */ + if (!count) + return true; + + rx_desc = IXGBE_RX_DESC(rx_ring, i); + bi = &rx_ring->rx_buffer_info[i]; + i -= rx_ring->count; + + do { + bi->xdp = xsk_buff_alloc(rx_ring->xsk_pool); + if (!bi->xdp) { + ok = false; + break; + } + + dma = xsk_buff_xdp_get_dma(bi->xdp); + + /* Refresh the desc even if buffer_addrs didn't change + * because each write-back erases this info. + */ + rx_desc->read.pkt_addr = cpu_to_le64(dma); + + rx_desc++; + bi++; + i++; + if (unlikely(!i)) { + rx_desc = IXGBE_RX_DESC(rx_ring, 0); + bi = rx_ring->rx_buffer_info; + i -= rx_ring->count; + } + + /* clear the length for the next_to_use descriptor */ + rx_desc->wb.upper.length = 0; + + count--; + } while (count); + + i += rx_ring->count; + + if (rx_ring->next_to_use != i) { + rx_ring->next_to_use = i; + + /* 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(i, rx_ring->tail); + } + + return ok; +} + +static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring, + const struct xdp_buff *xdp) +{ + unsigned int totalsize = xdp->data_end - xdp->data_meta; + unsigned int metasize = xdp->data - xdp->data_meta; + struct sk_buff *skb; + + 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)) + return NULL; + + memcpy(__skb_put(skb, totalsize), xdp->data_meta, + ALIGN(totalsize, sizeof(long))); + + if (metasize) { + skb_metadata_set(skb, metasize); + __skb_pull(skb, metasize); + } + + return skb; +} + +static void ixgbe_inc_ntc(struct ixgbe_ring *rx_ring) +{ + u32 ntc = rx_ring->next_to_clean + 1; + + ntc = (ntc < rx_ring->count) ? ntc : 0; + rx_ring->next_to_clean = ntc; + prefetch(IXGBE_RX_DESC(rx_ring, ntc)); +} + +int ixgbe_clean_rx_irq_zc(struct ixgbe_q_vector *q_vector, + struct ixgbe_ring *rx_ring, + const int budget) +{ + unsigned int total_rx_bytes = 0, total_rx_packets = 0; + struct ixgbe_adapter *adapter = q_vector->adapter; + u16 cleaned_count = ixgbe_desc_unused(rx_ring); + unsigned int xdp_res, xdp_xmit = 0; + bool failure = false; + struct sk_buff *skb; + + while (likely(total_rx_packets < budget)) { + union ixgbe_adv_rx_desc *rx_desc; + struct ixgbe_rx_buffer *bi; + unsigned int size; + + /* return some buffers to hardware, one at a time is too slow */ + if (cleaned_count >= IXGBE_RX_BUFFER_WRITE) { + failure = failure || + !ixgbe_alloc_rx_buffers_zc(rx_ring, + cleaned_count); + cleaned_count = 0; + } + + rx_desc = IXGBE_RX_DESC(rx_ring, rx_ring->next_to_clean); + size = le16_to_cpu(rx_desc->wb.upper.length); + if (!size) + break; + + /* This memory barrier is needed to keep us from reading + * any other fields out of the rx_desc until we know the + * descriptor has been written back + */ + dma_rmb(); + + bi = &rx_ring->rx_buffer_info[rx_ring->next_to_clean]; + + if (unlikely(!ixgbe_test_staterr(rx_desc, + IXGBE_RXD_STAT_EOP))) { + struct ixgbe_rx_buffer *next_bi; + + xsk_buff_free(bi->xdp); + bi->xdp = NULL; + ixgbe_inc_ntc(rx_ring); + next_bi = + &rx_ring->rx_buffer_info[rx_ring->next_to_clean]; + next_bi->discard = true; + continue; + } + + if (unlikely(bi->discard)) { + xsk_buff_free(bi->xdp); + bi->xdp = NULL; + bi->discard = false; + ixgbe_inc_ntc(rx_ring); + continue; + } + + bi->xdp->data_end = bi->xdp->data + size; + xsk_buff_dma_sync_for_cpu(bi->xdp, rx_ring->xsk_pool); + xdp_res = ixgbe_run_xdp_zc(adapter, rx_ring, bi->xdp); + + if (likely(xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR))) { + xdp_xmit |= xdp_res; + } else if (xdp_res == IXGBE_XDP_EXIT) { + failure = true; + break; + } else if (xdp_res == IXGBE_XDP_CONSUMED) { + xsk_buff_free(bi->xdp); + } else if (xdp_res == IXGBE_XDP_PASS) { + goto construct_skb; + } + + bi->xdp = NULL; + total_rx_packets++; + total_rx_bytes += size; + + cleaned_count++; + ixgbe_inc_ntc(rx_ring); + continue; + +construct_skb: + /* XDP_PASS path */ + skb = ixgbe_construct_skb_zc(rx_ring, bi->xdp); + if (!skb) { + rx_ring->rx_stats.alloc_rx_buff_failed++; + break; + } + + xsk_buff_free(bi->xdp); + bi->xdp = NULL; + + cleaned_count++; + ixgbe_inc_ntc(rx_ring); + + if (eth_skb_pad(skb)) + continue; + + total_rx_bytes += skb->len; + total_rx_packets++; + + ixgbe_process_skb_fields(rx_ring, rx_desc, skb); + ixgbe_rx_skb(q_vector, skb); + } + + if (xdp_xmit & IXGBE_XDP_REDIR) + xdp_do_flush_map(); + + if (xdp_xmit & IXGBE_XDP_TX) { + struct ixgbe_ring *ring = ixgbe_determine_xdp_ring(adapter); + + ixgbe_xdp_ring_update_tail_locked(ring); + } + + u64_stats_update_begin(&rx_ring->syncp); + rx_ring->stats.packets += total_rx_packets; + rx_ring->stats.bytes += total_rx_bytes; + u64_stats_update_end(&rx_ring->syncp); + q_vector->rx.total_packets += total_rx_packets; + q_vector->rx.total_bytes += total_rx_bytes; + + if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) { + if (failure || rx_ring->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; +} + +void ixgbe_xsk_clean_rx_ring(struct ixgbe_ring *rx_ring) +{ + struct ixgbe_rx_buffer *bi; + u16 i; + + for (i = 0; i < rx_ring->count; i++) { + bi = &rx_ring->rx_buffer_info[i]; + + if (!bi->xdp) + continue; + + xsk_buff_free(bi->xdp); + bi->xdp = NULL; + } +} + +static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget) +{ + struct xsk_buff_pool *pool = xdp_ring->xsk_pool; + union ixgbe_adv_tx_desc *tx_desc = NULL; + struct ixgbe_tx_buffer *tx_bi; + bool work_done = true; + struct xdp_desc desc; + dma_addr_t dma; + u32 cmd_type; + + while (budget-- > 0) { + if (unlikely(!ixgbe_desc_unused(xdp_ring))) { + work_done = false; + break; + } + + if (!netif_carrier_ok(xdp_ring->netdev)) + break; + + if (!xsk_tx_peek_desc(pool, &desc)) + break; + + dma = xsk_buff_raw_get_dma(pool, desc.addr); + xsk_buff_raw_dma_sync_for_device(pool, dma, desc.len); + + tx_bi = &xdp_ring->tx_buffer_info[xdp_ring->next_to_use]; + tx_bi->bytecount = desc.len; + tx_bi->xdpf = NULL; + tx_bi->gso_segs = 1; + + tx_desc = IXGBE_TX_DESC(xdp_ring, xdp_ring->next_to_use); + tx_desc->read.buffer_addr = cpu_to_le64(dma); + + /* put descriptor type bits */ + cmd_type = IXGBE_ADVTXD_DTYP_DATA | + IXGBE_ADVTXD_DCMD_DEXT | + IXGBE_ADVTXD_DCMD_IFCS; + cmd_type |= desc.len | IXGBE_TXD_CMD; + tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type); + tx_desc->read.olinfo_status = + cpu_to_le32(desc.len << IXGBE_ADVTXD_PAYLEN_SHIFT); + + xdp_ring->next_to_use++; + if (xdp_ring->next_to_use == xdp_ring->count) + xdp_ring->next_to_use = 0; + } + + if (tx_desc) { + ixgbe_xdp_ring_update_tail(xdp_ring); + xsk_tx_release(pool); + } + + return !!budget && work_done; +} + +static void ixgbe_clean_xdp_tx_buffer(struct ixgbe_ring *tx_ring, + struct ixgbe_tx_buffer *tx_bi) +{ + xdp_return_frame(tx_bi->xdpf); + 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); +} + +bool ixgbe_clean_xdp_tx_irq(struct ixgbe_q_vector *q_vector, + struct ixgbe_ring *tx_ring, int napi_budget) +{ + u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use; + unsigned int total_packets = 0, total_bytes = 0; + struct xsk_buff_pool *pool = tx_ring->xsk_pool; + union ixgbe_adv_tx_desc *tx_desc; + struct ixgbe_tx_buffer *tx_bi; + u32 xsk_frames = 0; + + tx_bi = &tx_ring->tx_buffer_info[ntc]; + tx_desc = IXGBE_TX_DESC(tx_ring, ntc); + + while (ntc != ntu) { + if (!(tx_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD))) + break; + + total_bytes += tx_bi->bytecount; + total_packets += tx_bi->gso_segs; + + if (tx_bi->xdpf) + ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi); + else + xsk_frames++; + + tx_bi->xdpf = NULL; + + tx_bi++; + tx_desc++; + ntc++; + if (unlikely(ntc == tx_ring->count)) { + ntc = 0; + tx_bi = tx_ring->tx_buffer_info; + tx_desc = IXGBE_TX_DESC(tx_ring, 0); + } + + /* issue prefetch for next Tx descriptor */ + prefetch(tx_desc); + } + + tx_ring->next_to_clean = ntc; + + u64_stats_update_begin(&tx_ring->syncp); + tx_ring->stats.bytes += total_bytes; + tx_ring->stats.packets += total_packets; + u64_stats_update_end(&tx_ring->syncp); + q_vector->tx.total_bytes += total_bytes; + q_vector->tx.total_packets += total_packets; + + if (xsk_frames) + xsk_tx_completed(pool, xsk_frames); + + if (xsk_uses_need_wakeup(pool)) + xsk_set_tx_need_wakeup(pool); + + return ixgbe_xmit_zc(tx_ring, q_vector->tx.work_limit); +} + +int ixgbe_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags) +{ + struct ixgbe_adapter *adapter = netdev_priv(dev); + struct ixgbe_ring *ring; + + if (test_bit(__IXGBE_DOWN, &adapter->state)) + return -ENETDOWN; + + if (!READ_ONCE(adapter->xdp_prog)) + return -EINVAL; + + if (qid >= adapter->num_xdp_queues) + return -EINVAL; + + ring = adapter->xdp_ring[qid]; + + if (test_bit(__IXGBE_TX_DISABLED, &ring->state)) + return -ENETDOWN; + + if (!ring->xsk_pool) + return -EINVAL; + + if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) { + u64 eics = BIT_ULL(ring->q_vector->v_idx); + + ixgbe_irq_rearm_queues(adapter, eics); + } + + return 0; +} + +void ixgbe_xsk_clean_tx_ring(struct ixgbe_ring *tx_ring) +{ + u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use; + struct xsk_buff_pool *pool = tx_ring->xsk_pool; + struct ixgbe_tx_buffer *tx_bi; + u32 xsk_frames = 0; + + while (ntc != ntu) { + tx_bi = &tx_ring->tx_buffer_info[ntc]; + + if (tx_bi->xdpf) + ixgbe_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(pool, xsk_frames); +} |