diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/rx.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/rx.c | 789 |
1 files changed, 197 insertions, 592 deletions
diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index 6af9cfda50fb..ffca82207e47 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -1,17 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0-only /**************************************************************************** - * Driver for Solarflare Solarstorm network controllers and boards + * Driver for Solarflare network controllers and boards * Copyright 2005-2006 Fen Systems Ltd. - * Copyright 2005-2011 Solarflare Communications Inc. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation, incorporated herein by reference. + * Copyright 2005-2013 Solarflare Communications Inc. */ #include <linux/socket.h> #include <linux/in.h> #include <linux/slab.h> #include <linux/ip.h> +#include <linux/ipv6.h> #include <linux/tcp.h> #include <linux/udp.h> #include <linux/prefetch.h> @@ -19,8 +17,12 @@ #include <linux/iommu.h> #include <net/ip.h> #include <net/checksum.h> +#include <net/xdp.h> +#include <linux/bpf_trace.h> #include "net_driver.h" #include "efx.h" +#include "rx_common.h" +#include "filter.h" #include "nic.h" #include "selftest.h" #include "workarounds.h" @@ -28,356 +30,16 @@ /* Preferred number of descriptors to fill at once */ #define EFX_RX_PREFERRED_BATCH 8U -/* Number of RX buffers to recycle pages for. When creating the RX page recycle - * ring, this number is divided by the number of buffers per page to calculate - * the number of pages to store in the RX page recycle ring. - */ -#define EFX_RECYCLE_RING_SIZE_IOMMU 4096 -#define EFX_RECYCLE_RING_SIZE_NOIOMMU (2 * EFX_RX_PREFERRED_BATCH) +/* Maximum rx prefix used by any architecture. */ +#define EFX_MAX_RX_PREFIX_SIZE 16 /* Size of buffer allocated for skb header area. */ #define EFX_SKB_HEADERS 128u -/* This is the percentage fill level below which new RX descriptors - * will be added to the RX descriptor ring. - */ -static unsigned int rx_refill_threshold; - /* Each packet can consume up to ceil(max_frame_len / buffer_size) buffers */ #define EFX_RX_MAX_FRAGS DIV_ROUND_UP(EFX_MAX_FRAME_LEN(EFX_MAX_MTU), \ EFX_RX_USR_BUF_SIZE) -/* - * RX maximum head room required. - * - * This must be at least 1 to prevent overflow, plus one packet-worth - * to allow pipelined receives. - */ -#define EFX_RXD_HEAD_ROOM (1 + EFX_RX_MAX_FRAGS) - -static inline u8 *efx_rx_buf_va(struct efx_rx_buffer *buf) -{ - return page_address(buf->page) + buf->page_offset; -} - -static inline u32 efx_rx_buf_hash(const u8 *eh) -{ - /* The ethernet header is always directly after any hash. */ -#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || NET_IP_ALIGN % 4 == 0 - return __le32_to_cpup((const __le32 *)(eh - 4)); -#else - const u8 *data = eh - 4; - return (u32)data[0] | - (u32)data[1] << 8 | - (u32)data[2] << 16 | - (u32)data[3] << 24; -#endif -} - -static inline struct efx_rx_buffer * -efx_rx_buf_next(struct efx_rx_queue *rx_queue, struct efx_rx_buffer *rx_buf) -{ - if (unlikely(rx_buf == efx_rx_buffer(rx_queue, rx_queue->ptr_mask))) - return efx_rx_buffer(rx_queue, 0); - else - return rx_buf + 1; -} - -static inline void efx_sync_rx_buffer(struct efx_nic *efx, - struct efx_rx_buffer *rx_buf, - unsigned int len) -{ - dma_sync_single_for_cpu(&efx->pci_dev->dev, rx_buf->dma_addr, len, - DMA_FROM_DEVICE); -} - -void efx_rx_config_page_split(struct efx_nic *efx) -{ - efx->rx_page_buf_step = ALIGN(efx->rx_dma_len + NET_IP_ALIGN, - EFX_RX_BUF_ALIGNMENT); - efx->rx_bufs_per_page = efx->rx_buffer_order ? 1 : - ((PAGE_SIZE - sizeof(struct efx_rx_page_state)) / - efx->rx_page_buf_step); - efx->rx_buffer_truesize = (PAGE_SIZE << efx->rx_buffer_order) / - efx->rx_bufs_per_page; - efx->rx_pages_per_batch = DIV_ROUND_UP(EFX_RX_PREFERRED_BATCH, - efx->rx_bufs_per_page); -} - -/* Check the RX page recycle ring for a page that can be reused. */ -static struct page *efx_reuse_page(struct efx_rx_queue *rx_queue) -{ - struct efx_nic *efx = rx_queue->efx; - struct page *page; - struct efx_rx_page_state *state; - unsigned index; - - index = rx_queue->page_remove & rx_queue->page_ptr_mask; - page = rx_queue->page_ring[index]; - if (page == NULL) - return NULL; - - rx_queue->page_ring[index] = NULL; - /* page_remove cannot exceed page_add. */ - if (rx_queue->page_remove != rx_queue->page_add) - ++rx_queue->page_remove; - - /* If page_count is 1 then we hold the only reference to this page. */ - if (page_count(page) == 1) { - ++rx_queue->page_recycle_count; - return page; - } else { - state = page_address(page); - dma_unmap_page(&efx->pci_dev->dev, state->dma_addr, - PAGE_SIZE << efx->rx_buffer_order, - DMA_FROM_DEVICE); - put_page(page); - ++rx_queue->page_recycle_failed; - } - - return NULL; -} - -/** - * efx_init_rx_buffers - create EFX_RX_BATCH page-based RX buffers - * - * @rx_queue: Efx RX queue - * - * This allocates a batch of pages, maps them for DMA, and populates - * struct efx_rx_buffers for each one. Return a negative error code or - * 0 on success. If a single page can be used for multiple buffers, - * then the page will either be inserted fully, or not at all. - */ -static int efx_init_rx_buffers(struct efx_rx_queue *rx_queue) -{ - struct efx_nic *efx = rx_queue->efx; - struct efx_rx_buffer *rx_buf; - struct page *page; - unsigned int page_offset; - struct efx_rx_page_state *state; - dma_addr_t dma_addr; - unsigned index, count; - - count = 0; - do { - page = efx_reuse_page(rx_queue); - if (page == NULL) { - page = alloc_pages(__GFP_COLD | __GFP_COMP | GFP_ATOMIC, - efx->rx_buffer_order); - if (unlikely(page == NULL)) - return -ENOMEM; - dma_addr = - dma_map_page(&efx->pci_dev->dev, page, 0, - PAGE_SIZE << efx->rx_buffer_order, - DMA_FROM_DEVICE); - if (unlikely(dma_mapping_error(&efx->pci_dev->dev, - dma_addr))) { - __free_pages(page, efx->rx_buffer_order); - return -EIO; - } - state = page_address(page); - state->dma_addr = dma_addr; - } else { - state = page_address(page); - dma_addr = state->dma_addr; - } - - dma_addr += sizeof(struct efx_rx_page_state); - page_offset = sizeof(struct efx_rx_page_state); - - do { - index = rx_queue->added_count & rx_queue->ptr_mask; - rx_buf = efx_rx_buffer(rx_queue, index); - rx_buf->dma_addr = dma_addr + NET_IP_ALIGN; - rx_buf->page = page; - rx_buf->page_offset = page_offset + NET_IP_ALIGN; - rx_buf->len = efx->rx_dma_len; - rx_buf->flags = 0; - ++rx_queue->added_count; - get_page(page); - dma_addr += efx->rx_page_buf_step; - page_offset += efx->rx_page_buf_step; - } while (page_offset + efx->rx_page_buf_step <= PAGE_SIZE); - - rx_buf->flags = EFX_RX_BUF_LAST_IN_PAGE; - } while (++count < efx->rx_pages_per_batch); - - return 0; -} - -/* Unmap a DMA-mapped page. This function is only called for the final RX - * buffer in a page. - */ -static void efx_unmap_rx_buffer(struct efx_nic *efx, - struct efx_rx_buffer *rx_buf) -{ - struct page *page = rx_buf->page; - - if (page) { - struct efx_rx_page_state *state = page_address(page); - dma_unmap_page(&efx->pci_dev->dev, - state->dma_addr, - PAGE_SIZE << efx->rx_buffer_order, - DMA_FROM_DEVICE); - } -} - -static void efx_free_rx_buffer(struct efx_rx_buffer *rx_buf) -{ - if (rx_buf->page) { - put_page(rx_buf->page); - rx_buf->page = NULL; - } -} - -/* Attempt to recycle the page if there is an RX recycle ring; the page can - * only be added if this is the final RX buffer, to prevent pages being used in - * the descriptor ring and appearing in the recycle ring simultaneously. - */ -static void efx_recycle_rx_page(struct efx_channel *channel, - struct efx_rx_buffer *rx_buf) -{ - struct page *page = rx_buf->page; - struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel); - struct efx_nic *efx = rx_queue->efx; - unsigned index; - - /* Only recycle the page after processing the final buffer. */ - if (!(rx_buf->flags & EFX_RX_BUF_LAST_IN_PAGE)) - return; - - index = rx_queue->page_add & rx_queue->page_ptr_mask; - if (rx_queue->page_ring[index] == NULL) { - unsigned read_index = rx_queue->page_remove & - rx_queue->page_ptr_mask; - - /* The next slot in the recycle ring is available, but - * increment page_remove if the read pointer currently - * points here. - */ - if (read_index == index) - ++rx_queue->page_remove; - rx_queue->page_ring[index] = page; - ++rx_queue->page_add; - return; - } - ++rx_queue->page_recycle_full; - efx_unmap_rx_buffer(efx, rx_buf); - put_page(rx_buf->page); -} - -static void efx_fini_rx_buffer(struct efx_rx_queue *rx_queue, - struct efx_rx_buffer *rx_buf) -{ - /* Release the page reference we hold for the buffer. */ - if (rx_buf->page) - put_page(rx_buf->page); - - /* If this is the last buffer in a page, unmap and free it. */ - if (rx_buf->flags & EFX_RX_BUF_LAST_IN_PAGE) { - efx_unmap_rx_buffer(rx_queue->efx, rx_buf); - efx_free_rx_buffer(rx_buf); - } - rx_buf->page = NULL; -} - -/* Recycle the pages that are used by buffers that have just been received. */ -static void efx_recycle_rx_pages(struct efx_channel *channel, - struct efx_rx_buffer *rx_buf, - unsigned int n_frags) -{ - struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel); - - do { - efx_recycle_rx_page(channel, rx_buf); - rx_buf = efx_rx_buf_next(rx_queue, rx_buf); - } while (--n_frags); -} - -static void efx_discard_rx_packet(struct efx_channel *channel, - struct efx_rx_buffer *rx_buf, - unsigned int n_frags) -{ - struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel); - - efx_recycle_rx_pages(channel, rx_buf, n_frags); - - do { - efx_free_rx_buffer(rx_buf); - rx_buf = efx_rx_buf_next(rx_queue, rx_buf); - } while (--n_frags); -} - -/** - * efx_fast_push_rx_descriptors - push new RX descriptors quickly - * @rx_queue: RX descriptor queue - * - * This will aim to fill the RX descriptor queue up to - * @rx_queue->@max_fill. If there is insufficient atomic - * memory to do so, a slow fill will be scheduled. - * - * The caller must provide serialisation (none is used here). In practise, - * this means this function must run from the NAPI handler, or be called - * when NAPI is disabled. - */ -void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue) -{ - struct efx_nic *efx = rx_queue->efx; - unsigned int fill_level, batch_size; - int space, rc = 0; - - /* Calculate current fill level, and exit if we don't need to fill */ - fill_level = (rx_queue->added_count - rx_queue->removed_count); - EFX_BUG_ON_PARANOID(fill_level > rx_queue->efx->rxq_entries); - if (fill_level >= rx_queue->fast_fill_trigger) - goto out; - - /* Record minimum fill level */ - if (unlikely(fill_level < rx_queue->min_fill)) { - if (fill_level) - rx_queue->min_fill = fill_level; - } - - batch_size = efx->rx_pages_per_batch * efx->rx_bufs_per_page; - space = rx_queue->max_fill - fill_level; - EFX_BUG_ON_PARANOID(space < batch_size); - - netif_vdbg(rx_queue->efx, rx_status, rx_queue->efx->net_dev, - "RX queue %d fast-filling descriptor ring from" - " level %d to level %d\n", - efx_rx_queue_index(rx_queue), fill_level, - rx_queue->max_fill); - - - do { - rc = efx_init_rx_buffers(rx_queue); - if (unlikely(rc)) { - /* Ensure that we don't leave the rx queue empty */ - if (rx_queue->added_count == rx_queue->removed_count) - efx_schedule_slow_fill(rx_queue); - goto out; - } - } while ((space -= batch_size) >= batch_size); - - netif_vdbg(rx_queue->efx, rx_status, rx_queue->efx->net_dev, - "RX queue %d fast-filled descriptor ring " - "to level %d\n", efx_rx_queue_index(rx_queue), - rx_queue->added_count - rx_queue->removed_count); - - out: - if (rx_queue->notified_count != rx_queue->added_count) - efx_nic_notify_rx_desc(rx_queue); -} - -void efx_rx_slow_fill(unsigned long context) -{ - struct efx_rx_queue *rx_queue = (struct efx_rx_queue *)context; - - /* Post an event to cause NAPI to run and refill the queue */ - efx_nic_generate_fill_event(rx_queue); - ++rx_queue->slow_fill_count; -} - static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue, struct efx_rx_buffer *rx_buf, int len) @@ -393,74 +55,14 @@ static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue, */ rx_buf->flags |= EFX_RX_PKT_DISCARD; - if ((len > rx_buf->len) && EFX_WORKAROUND_8071(efx)) { - if (net_ratelimit()) - netif_err(efx, rx_err, efx->net_dev, - " RX queue %d seriously overlength " - "RX event (0x%x > 0x%x+0x%x). Leaking\n", - efx_rx_queue_index(rx_queue), len, max_len, - efx->type->rx_buffer_padding); - efx_schedule_reset(efx, RESET_TYPE_RX_RECOVERY); - } else { - if (net_ratelimit()) - netif_err(efx, rx_err, efx->net_dev, - " RX queue %d overlength RX event " - "(0x%x > 0x%x)\n", - efx_rx_queue_index(rx_queue), len, max_len); - } + if (net_ratelimit()) + netif_err(efx, rx_err, efx->net_dev, + "RX queue %d overlength RX event (%#x > %#x)\n", + efx_rx_queue_index(rx_queue), len, max_len); efx_rx_queue_channel(rx_queue)->n_rx_overlength++; } -/* Pass a received packet up through GRO. GRO can handle pages - * regardless of checksum state and skbs with a good checksum. - */ -static void -efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf, - unsigned int n_frags, u8 *eh) -{ - struct napi_struct *napi = &channel->napi_str; - gro_result_t gro_result; - struct efx_nic *efx = channel->efx; - struct sk_buff *skb; - - skb = napi_get_frags(napi); - if (unlikely(!skb)) { - while (n_frags--) { - put_page(rx_buf->page); - rx_buf->page = NULL; - rx_buf = efx_rx_buf_next(&channel->rx_queue, rx_buf); - } - return; - } - - if (efx->net_dev->features & NETIF_F_RXHASH) - skb->rxhash = efx_rx_buf_hash(eh); - skb->ip_summed = ((rx_buf->flags & EFX_RX_PKT_CSUMMED) ? - CHECKSUM_UNNECESSARY : CHECKSUM_NONE); - - for (;;) { - skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, - rx_buf->page, rx_buf->page_offset, - rx_buf->len); - rx_buf->page = NULL; - skb->len += rx_buf->len; - if (skb_shinfo(skb)->nr_frags == n_frags) - break; - - rx_buf = efx_rx_buf_next(&channel->rx_queue, rx_buf); - } - - skb->data_len = skb->len; - skb->truesize += n_frags * efx->rx_buffer_truesize; - - skb_record_rx_queue(skb, channel->rx_queue.core_index); - - gro_result = napi_gro_frags(napi); - if (gro_result != GRO_DROP) - channel->irq_mod_score += 2; -} - /* Allocate and construct an SKB around page fragments */ static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel, struct efx_rx_buffer *rx_buf, @@ -471,14 +73,20 @@ static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel, struct sk_buff *skb; /* Allocate an SKB to store the headers */ - skb = netdev_alloc_skb(efx->net_dev, hdr_len + EFX_PAGE_SKB_ALIGN); - if (unlikely(skb == NULL)) + skb = netdev_alloc_skb(efx->net_dev, + efx->rx_ip_align + efx->rx_prefix_size + + hdr_len); + if (unlikely(skb == NULL)) { + atomic_inc(&efx->n_rx_noskb_drops); return NULL; + } - EFX_BUG_ON_PARANOID(rx_buf->len < hdr_len); + EFX_WARN_ON_ONCE_PARANOID(rx_buf->len < hdr_len); - skb_reserve(skb, EFX_PAGE_SKB_ALIGN); - memcpy(__skb_put(skb, hdr_len), eh, hdr_len); + memcpy(skb->data + efx->rx_ip_align, eh - efx->rx_prefix_size, + efx->rx_prefix_size + hdr_len); + skb_reserve(skb, efx->rx_ip_align + efx->rx_prefix_size); + __skb_put(skb, hdr_len); /* Append the remaining page(s) onto the frag list */ if (rx_buf->len > hdr_len) { @@ -486,12 +94,11 @@ static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel, rx_buf->len -= hdr_len; for (;;) { - skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, - rx_buf->page, rx_buf->page_offset, - rx_buf->len); + skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, + rx_buf->page, rx_buf->page_offset, + rx_buf->len, efx->rx_buffer_truesize); rx_buf->page = NULL; - skb->len += rx_buf->len; - skb->data_len += rx_buf->len; + if (skb_shinfo(skb)->nr_frags == n_frags) break; @@ -503,11 +110,11 @@ static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel, n_frags = 0; } - skb->truesize += n_frags * efx->rx_buffer_truesize; - /* Move past the ethernet header */ skb->protocol = eth_type_trans(skb, efx->net_dev); + skb_mark_napi_id(skb, &channel->napi_str); + return skb; } @@ -523,10 +130,11 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index, /* Validate the number of fragments and completed length */ if (n_frags == 1) { - efx_rx_packet__check_len(rx_queue, rx_buf, len); + if (!(flags & EFX_RX_PKT_PREFIX_LEN)) + efx_rx_packet__check_len(rx_queue, rx_buf, len); } else if (unlikely(n_frags > EFX_RX_MAX_FRAGS) || - unlikely(len <= (n_frags - 1) * EFX_RX_USR_BUF_SIZE) || - unlikely(len > n_frags * EFX_RX_USR_BUF_SIZE) || + unlikely(len <= (n_frags - 1) * efx->rx_dma_len) || + unlikely(len > n_frags * efx->rx_dma_len) || unlikely(!efx->rx_scatter)) { /* If this isn't an explicit discard request, either * the hardware or the driver is broken. @@ -551,7 +159,7 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index, return; } - if (n_frags == 1) + if (n_frags == 1 && !(flags & EFX_RX_PKT_PREFIX_LEN)) rx_buf->len = len; /* Release and/or sync the DMA mapping - assumes all RX buffers @@ -564,8 +172,8 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index, */ prefetch(efx_rx_buf_va(rx_buf)); - rx_buf->page_offset += efx->type->rx_buffer_hash_size; - rx_buf->len -= efx->type->rx_buffer_hash_size; + rx_buf->page_offset += efx->rx_prefix_size; + rx_buf->len -= efx->rx_prefix_size; if (n_frags > 1) { /* Release/sync DMA mapping for additional fragments. @@ -577,9 +185,9 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index, rx_buf = efx_rx_buf_next(rx_queue, rx_buf); if (--tail_frags == 0) break; - efx_sync_rx_buffer(efx, rx_buf, EFX_RX_USR_BUF_SIZE); + efx_sync_rx_buffer(efx, rx_buf, efx->rx_dma_len); } - rx_buf->len = len - (n_frags - 1) * EFX_RX_USR_BUF_SIZE; + rx_buf->len = len - (n_frags - 1) * efx->rx_dma_len; efx_sync_rx_buffer(efx, rx_buf, rx_buf->len); } @@ -604,202 +212,199 @@ static void efx_rx_deliver(struct efx_channel *channel, u8 *eh, skb = efx_rx_mk_skb(channel, rx_buf, n_frags, eh, hdr_len); if (unlikely(skb == NULL)) { - efx_free_rx_buffer(rx_buf); + struct efx_rx_queue *rx_queue; + + rx_queue = efx_channel_get_rx_queue(channel); + efx_free_rx_buffers(rx_queue, rx_buf, n_frags); return; } skb_record_rx_queue(skb, channel->rx_queue.core_index); /* Set the SKB flags */ skb_checksum_none_assert(skb); - if (likely(rx_buf->flags & EFX_RX_PKT_CSUMMED)) + if (likely(rx_buf->flags & EFX_RX_PKT_CSUMMED)) { skb->ip_summed = CHECKSUM_UNNECESSARY; + skb->csum_level = !!(rx_buf->flags & EFX_RX_PKT_CSUM_LEVEL); + } + + efx_rx_skb_attach_timestamp(channel, skb); if (channel->type->receive_skb) if (channel->type->receive_skb(channel, skb)) return; /* Pass the packet up */ - netif_receive_skb(skb); + if (channel->rx_list != NULL) + /* Add to list, will pass up later */ + list_add_tail(&skb->list, channel->rx_list); + else + /* No list, so pass it up now */ + netif_receive_skb(skb); +} + +/** efx_do_xdp: perform XDP processing on a received packet + * + * Returns true if packet should still be delivered. + */ +static bool efx_do_xdp(struct efx_nic *efx, struct efx_channel *channel, + struct efx_rx_buffer *rx_buf, u8 **ehp) +{ + u8 rx_prefix[EFX_MAX_RX_PREFIX_SIZE]; + struct efx_rx_queue *rx_queue; + struct bpf_prog *xdp_prog; + struct xdp_frame *xdpf; + struct xdp_buff xdp; + u32 xdp_act; + s16 offset; + int err; + + xdp_prog = rcu_dereference_bh(efx->xdp_prog); + if (!xdp_prog) + return true; + + rx_queue = efx_channel_get_rx_queue(channel); + + if (unlikely(channel->rx_pkt_n_frags > 1)) { + /* We can't do XDP on fragmented packets - drop. */ + efx_free_rx_buffers(rx_queue, rx_buf, + channel->rx_pkt_n_frags); + if (net_ratelimit()) + netif_err(efx, rx_err, efx->net_dev, + "XDP is not possible with multiple receive fragments (%d)\n", + channel->rx_pkt_n_frags); + channel->n_rx_xdp_bad_drops++; + return false; + } + + dma_sync_single_for_cpu(&efx->pci_dev->dev, rx_buf->dma_addr, + rx_buf->len, DMA_FROM_DEVICE); + + /* Save the rx prefix. */ + EFX_WARN_ON_PARANOID(efx->rx_prefix_size > EFX_MAX_RX_PREFIX_SIZE); + memcpy(rx_prefix, *ehp - efx->rx_prefix_size, + efx->rx_prefix_size); + + xdp_init_buff(&xdp, efx->rx_page_buf_step, &rx_queue->xdp_rxq_info); + /* No support yet for XDP metadata */ + xdp_prepare_buff(&xdp, *ehp - EFX_XDP_HEADROOM, EFX_XDP_HEADROOM, + rx_buf->len, false); + + xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp); + + offset = (u8 *)xdp.data - *ehp; + + switch (xdp_act) { + case XDP_PASS: + /* Fix up rx prefix. */ + if (offset) { + *ehp += offset; + rx_buf->page_offset += offset; + rx_buf->len -= offset; + memcpy(*ehp - efx->rx_prefix_size, rx_prefix, + efx->rx_prefix_size); + } + break; + + case XDP_TX: + /* Buffer ownership passes to tx on success. */ + xdpf = xdp_convert_buff_to_frame(&xdp); + err = efx_xdp_tx_buffers(efx, 1, &xdpf, true); + if (unlikely(err != 1)) { + efx_free_rx_buffers(rx_queue, rx_buf, 1); + if (net_ratelimit()) + netif_err(efx, rx_err, efx->net_dev, + "XDP TX failed (%d)\n", err); + channel->n_rx_xdp_bad_drops++; + trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); + } else { + channel->n_rx_xdp_tx++; + } + break; + + case XDP_REDIRECT: + err = xdp_do_redirect(efx->net_dev, &xdp, xdp_prog); + if (unlikely(err)) { + efx_free_rx_buffers(rx_queue, rx_buf, 1); + if (net_ratelimit()) + netif_err(efx, rx_err, efx->net_dev, + "XDP redirect failed (%d)\n", err); + channel->n_rx_xdp_bad_drops++; + trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); + } else { + channel->n_rx_xdp_redirect++; + } + break; + + default: + bpf_warn_invalid_xdp_action(efx->net_dev, xdp_prog, xdp_act); + efx_free_rx_buffers(rx_queue, rx_buf, 1); + channel->n_rx_xdp_bad_drops++; + trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); + break; + + case XDP_ABORTED: + trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); + fallthrough; + case XDP_DROP: + efx_free_rx_buffers(rx_queue, rx_buf, 1); + channel->n_rx_xdp_drops++; + break; + } + + return xdp_act == XDP_PASS; } /* Handle a received packet. Second half: Touches packet payload. */ void __efx_rx_packet(struct efx_channel *channel) { + struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel); struct efx_nic *efx = channel->efx; struct efx_rx_buffer *rx_buf = - efx_rx_buffer(&channel->rx_queue, channel->rx_pkt_index); + efx_rx_buffer(rx_queue, channel->rx_pkt_index); u8 *eh = efx_rx_buf_va(rx_buf); + /* Read length from the prefix if necessary. This already + * excludes the length of the prefix itself. + */ + if (rx_buf->flags & EFX_RX_PKT_PREFIX_LEN) { + rx_buf->len = le16_to_cpup((__le16 *) + (eh + efx->rx_packet_len_offset)); + /* A known issue may prevent this being filled in; + * if that happens, just drop the packet. + * Must do that in the driver since passing a zero-length + * packet up to the stack may cause a crash. + */ + if (unlikely(!rx_buf->len)) { + efx_free_rx_buffers(rx_queue, rx_buf, + channel->rx_pkt_n_frags); + channel->n_rx_frm_trunc++; + goto out; + } + } + /* If we're in loopback test, then pass the packet directly to the * loopback layer, and free the rx_buf here */ if (unlikely(efx->loopback_selftest)) { efx_loopback_rx_packet(efx, eh, rx_buf->len); - efx_free_rx_buffer(rx_buf); + efx_free_rx_buffers(rx_queue, rx_buf, + channel->rx_pkt_n_frags); goto out; } + rx_queue->rx_packets++; + rx_queue->rx_bytes += rx_buf->len; + + if (!efx_do_xdp(efx, channel, rx_buf, &eh)) + goto out; + if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM))) rx_buf->flags &= ~EFX_RX_PKT_CSUMMED; if ((rx_buf->flags & EFX_RX_PKT_TCP) && !channel->type->receive_skb) - efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh); + efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh, 0); else efx_rx_deliver(channel, eh, rx_buf, channel->rx_pkt_n_frags); out: channel->rx_pkt_n_frags = 0; } - -int efx_probe_rx_queue(struct efx_rx_queue *rx_queue) -{ - struct efx_nic *efx = rx_queue->efx; - unsigned int entries; - int rc; - - /* Create the smallest power-of-two aligned ring */ - entries = max(roundup_pow_of_two(efx->rxq_entries), EFX_MIN_DMAQ_SIZE); - EFX_BUG_ON_PARANOID(entries > EFX_MAX_DMAQ_SIZE); - rx_queue->ptr_mask = entries - 1; - - netif_dbg(efx, probe, efx->net_dev, - "creating RX queue %d size %#x mask %#x\n", - efx_rx_queue_index(rx_queue), efx->rxq_entries, - rx_queue->ptr_mask); - - /* Allocate RX buffers */ - rx_queue->buffer = kcalloc(entries, sizeof(*rx_queue->buffer), - GFP_KERNEL); - if (!rx_queue->buffer) - return -ENOMEM; - - rc = efx_nic_probe_rx(rx_queue); - if (rc) { - kfree(rx_queue->buffer); - rx_queue->buffer = NULL; - } - - return rc; -} - -static void efx_init_rx_recycle_ring(struct efx_nic *efx, - struct efx_rx_queue *rx_queue) -{ - unsigned int bufs_in_recycle_ring, page_ring_size; - - /* Set the RX recycle ring size */ -#ifdef CONFIG_PPC64 - bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_IOMMU; -#else - if (iommu_present(&pci_bus_type)) - bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_IOMMU; - else - bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_NOIOMMU; -#endif /* CONFIG_PPC64 */ - - page_ring_size = roundup_pow_of_two(bufs_in_recycle_ring / - efx->rx_bufs_per_page); - rx_queue->page_ring = kcalloc(page_ring_size, - sizeof(*rx_queue->page_ring), GFP_KERNEL); - rx_queue->page_ptr_mask = page_ring_size - 1; -} - -void efx_init_rx_queue(struct efx_rx_queue *rx_queue) -{ - struct efx_nic *efx = rx_queue->efx; - unsigned int max_fill, trigger, max_trigger; - - netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev, - "initialising RX queue %d\n", efx_rx_queue_index(rx_queue)); - - /* Initialise ptr fields */ - rx_queue->added_count = 0; - rx_queue->notified_count = 0; - rx_queue->removed_count = 0; - rx_queue->min_fill = -1U; - efx_init_rx_recycle_ring(efx, rx_queue); - - rx_queue->page_remove = 0; - rx_queue->page_add = rx_queue->page_ptr_mask + 1; - rx_queue->page_recycle_count = 0; - rx_queue->page_recycle_failed = 0; - rx_queue->page_recycle_full = 0; - - /* Initialise limit fields */ - max_fill = efx->rxq_entries - EFX_RXD_HEAD_ROOM; - max_trigger = - max_fill - efx->rx_pages_per_batch * efx->rx_bufs_per_page; - if (rx_refill_threshold != 0) { - trigger = max_fill * min(rx_refill_threshold, 100U) / 100U; - if (trigger > max_trigger) - trigger = max_trigger; - } else { - trigger = max_trigger; - } - - rx_queue->max_fill = max_fill; - rx_queue->fast_fill_trigger = trigger; - - /* Set up RX descriptor ring */ - rx_queue->enabled = true; - efx_nic_init_rx(rx_queue); -} - -void efx_fini_rx_queue(struct efx_rx_queue *rx_queue) -{ - int i; - struct efx_nic *efx = rx_queue->efx; - struct efx_rx_buffer *rx_buf; - - netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev, - "shutting down RX queue %d\n", efx_rx_queue_index(rx_queue)); - - /* A flush failure might have left rx_queue->enabled */ - rx_queue->enabled = false; - - del_timer_sync(&rx_queue->slow_fill); - efx_nic_fini_rx(rx_queue); - - /* Release RX buffers from the current read ptr to the write ptr */ - if (rx_queue->buffer) { - for (i = rx_queue->removed_count; i < rx_queue->added_count; - i++) { - unsigned index = i & rx_queue->ptr_mask; - rx_buf = efx_rx_buffer(rx_queue, index); - efx_fini_rx_buffer(rx_queue, rx_buf); - } - } - - /* Unmap and release the pages in the recycle ring. Remove the ring. */ - for (i = 0; i <= rx_queue->page_ptr_mask; i++) { - struct page *page = rx_queue->page_ring[i]; - struct efx_rx_page_state *state; - - if (page == NULL) - continue; - - state = page_address(page); - dma_unmap_page(&efx->pci_dev->dev, state->dma_addr, - PAGE_SIZE << efx->rx_buffer_order, - DMA_FROM_DEVICE); - put_page(page); - } - kfree(rx_queue->page_ring); - rx_queue->page_ring = NULL; -} - -void efx_remove_rx_queue(struct efx_rx_queue *rx_queue) -{ - netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev, - "destroying RX queue %d\n", efx_rx_queue_index(rx_queue)); - - efx_nic_remove_rx(rx_queue); - - kfree(rx_queue->buffer); - rx_queue->buffer = NULL; -} - - -module_param(rx_refill_threshold, uint, 0444); -MODULE_PARM_DESC(rx_refill_threshold, - "RX descriptor ring refill threshold (%)"); - |