From 6778948f9de86c3cfaf36725a7c87dcff9ba247f Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 08:20:59 +0000
Subject: [PATCH] kernel_5.10 no rt
---
kernel/drivers/net/ethernet/sfc/rx.c | 920 ++++++++-------------------------------------------------
1 files changed, 131 insertions(+), 789 deletions(-)
diff --git a/kernel/drivers/net/ethernet/sfc/rx.c b/kernel/drivers/net/ethernet/sfc/rx.c
index 396ff01..aaa1128 100644
--- a/kernel/drivers/net/ethernet/sfc/rx.c
+++ b/kernel/drivers/net/ethernet/sfc/rx.c
@@ -1,11 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2005-2006 Fen Systems Ltd.
* Copyright 2005-2013 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.
*/
#include <linux/socket.h>
@@ -20,8 +17,11 @@
#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"
@@ -30,360 +30,15 @@
/* 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(struct efx_nic *efx, const u8 *eh)
-{
-#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
- return __le32_to_cpup((const __le32 *)(eh + efx->rx_packet_hash_offset));
-#else
- const u8 *data = eh + efx->rx_packet_hash_offset;
- 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 + efx->rx_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, bool atomic)
-{
- 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_COMP |
- (atomic ? GFP_ATOMIC : GFP_KERNEL),
- 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 + efx->rx_ip_align;
- rx_buf->page = page;
- rx_buf->page_offset = page_offset + efx->rx_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_buffers(struct efx_rx_queue *rx_queue,
- struct efx_rx_buffer *rx_buf,
- unsigned int num_bufs)
-{
- do {
- if (rx_buf->page) {
- put_page(rx_buf->page);
- rx_buf->page = NULL;
- }
- rx_buf = efx_rx_buf_next(rx_queue, rx_buf);
- } while (--num_bufs);
-}
-
-/* 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_buffers(rx_queue, rx_buf, 1);
- }
- 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);
-
- efx_free_rx_buffers(rx_queue, rx_buf, 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, bool atomic)
-{
- struct efx_nic *efx = rx_queue->efx;
- unsigned int fill_level, batch_size;
- int space, rc = 0;
-
- if (!rx_queue->refill_enabled)
- return;
-
- /* Calculate current fill level, and exit if we don't need to fill */
- fill_level = (rx_queue->added_count - rx_queue->removed_count);
- EFX_WARN_ON_ONCE_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_WARN_ON_ONCE_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, atomic);
- 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(struct timer_list *t)
-{
- struct efx_rx_queue *rx_queue = from_timer(rx_queue, t, slow_fill);
-
- /* 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,
@@ -406,56 +61,6 @@
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)) {
- 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;
- }
-
- if (efx->net_dev->features & NETIF_F_RXHASH)
- skb_set_hash(skb, efx_rx_buf_hash(efx, eh),
- PKT_HASH_TYPE_L3);
- skb->ip_summed = ((rx_buf->flags & EFX_RX_PKT_CSUMMED) ?
- CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
- skb->csum_level = !!(rx_buf->flags & EFX_RX_PKT_CSUM_LEVEL);
-
- 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 */
@@ -642,6 +247,127 @@
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;
+
+ rcu_read_lock();
+ xdp_prog = rcu_dereference(efx->xdp_prog);
+ if (!xdp_prog) {
+ rcu_read_unlock();
+ 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. */
+ rcu_read_unlock();
+ 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.data = *ehp;
+ xdp.data_hard_start = xdp.data - EFX_XDP_HEADROOM;
+
+ /* No support yet for XDP metadata */
+ xdp_set_data_meta_invalid(&xdp);
+ xdp.data_end = xdp.data + rx_buf->len;
+ xdp.rxq = &rx_queue->xdp_rxq_info;
+ xdp.frame_sz = efx->rx_page_buf_step;
+
+ xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp);
+ rcu_read_unlock();
+
+ 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(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)
{
@@ -670,400 +396,16 @@
goto out;
}
+ 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_WARN_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;
- rx_queue->refill_enabled = true;
-
- /* Set up RX descriptor ring */
- 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));
-
- del_timer_sync(&rx_queue->slow_fill);
-
- /* 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 (%)");
-
-#ifdef CONFIG_RFS_ACCEL
-
-static void efx_filter_rfs_work(struct work_struct *data)
-{
- struct efx_async_filter_insertion *req = container_of(data, struct efx_async_filter_insertion,
- work);
- struct efx_nic *efx = netdev_priv(req->net_dev);
- struct efx_channel *channel = efx_get_channel(efx, req->rxq_index);
- int slot_idx = req - efx->rps_slot;
- struct efx_arfs_rule *rule;
- u16 arfs_id = 0;
- int rc;
-
- rc = efx->type->filter_insert(efx, &req->spec, true);
- if (rc >= 0)
- rc %= efx->type->max_rx_ip_filters;
- if (efx->rps_hash_table) {
- spin_lock_bh(&efx->rps_hash_lock);
- rule = efx_rps_hash_find(efx, &req->spec);
- /* The rule might have already gone, if someone else's request
- * for the same spec was already worked and then expired before
- * we got around to our work. In that case we have nothing
- * tying us to an arfs_id, meaning that as soon as the filter
- * is considered for expiry it will be removed.
- */
- if (rule) {
- if (rc < 0)
- rule->filter_id = EFX_ARFS_FILTER_ID_ERROR;
- else
- rule->filter_id = rc;
- arfs_id = rule->arfs_id;
- }
- spin_unlock_bh(&efx->rps_hash_lock);
- }
- if (rc >= 0) {
- /* Remember this so we can check whether to expire the filter
- * later.
- */
- mutex_lock(&efx->rps_mutex);
- channel->rps_flow_id[rc] = req->flow_id;
- ++channel->rfs_filters_added;
- mutex_unlock(&efx->rps_mutex);
-
- if (req->spec.ether_type == htons(ETH_P_IP))
- netif_info(efx, rx_status, efx->net_dev,
- "steering %s %pI4:%u:%pI4:%u to queue %u [flow %u filter %d id %u]\n",
- (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP",
- req->spec.rem_host, ntohs(req->spec.rem_port),
- req->spec.loc_host, ntohs(req->spec.loc_port),
- req->rxq_index, req->flow_id, rc, arfs_id);
- else
- netif_info(efx, rx_status, efx->net_dev,
- "steering %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u filter %d id %u]\n",
- (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP",
- req->spec.rem_host, ntohs(req->spec.rem_port),
- req->spec.loc_host, ntohs(req->spec.loc_port),
- req->rxq_index, req->flow_id, rc, arfs_id);
- }
-
- /* Release references */
- clear_bit(slot_idx, &efx->rps_slot_map);
- dev_put(req->net_dev);
-}
-
-int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
- u16 rxq_index, u32 flow_id)
-{
- struct efx_nic *efx = netdev_priv(net_dev);
- struct efx_async_filter_insertion *req;
- struct efx_arfs_rule *rule;
- struct flow_keys fk;
- int slot_idx;
- bool new;
- int rc;
-
- /* find a free slot */
- for (slot_idx = 0; slot_idx < EFX_RPS_MAX_IN_FLIGHT; slot_idx++)
- if (!test_and_set_bit(slot_idx, &efx->rps_slot_map))
- break;
- if (slot_idx >= EFX_RPS_MAX_IN_FLIGHT)
- return -EBUSY;
-
- if (flow_id == RPS_FLOW_ID_INVALID) {
- rc = -EINVAL;
- goto out_clear;
- }
-
- if (!skb_flow_dissect_flow_keys(skb, &fk, 0)) {
- rc = -EPROTONOSUPPORT;
- goto out_clear;
- }
-
- if (fk.basic.n_proto != htons(ETH_P_IP) && fk.basic.n_proto != htons(ETH_P_IPV6)) {
- rc = -EPROTONOSUPPORT;
- goto out_clear;
- }
- if (fk.control.flags & FLOW_DIS_IS_FRAGMENT) {
- rc = -EPROTONOSUPPORT;
- goto out_clear;
- }
-
- req = efx->rps_slot + slot_idx;
- efx_filter_init_rx(&req->spec, EFX_FILTER_PRI_HINT,
- efx->rx_scatter ? EFX_FILTER_FLAG_RX_SCATTER : 0,
- rxq_index);
- req->spec.match_flags =
- EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_IP_PROTO |
- EFX_FILTER_MATCH_LOC_HOST | EFX_FILTER_MATCH_LOC_PORT |
- EFX_FILTER_MATCH_REM_HOST | EFX_FILTER_MATCH_REM_PORT;
- req->spec.ether_type = fk.basic.n_proto;
- req->spec.ip_proto = fk.basic.ip_proto;
-
- if (fk.basic.n_proto == htons(ETH_P_IP)) {
- req->spec.rem_host[0] = fk.addrs.v4addrs.src;
- req->spec.loc_host[0] = fk.addrs.v4addrs.dst;
- } else {
- memcpy(req->spec.rem_host, &fk.addrs.v6addrs.src,
- sizeof(struct in6_addr));
- memcpy(req->spec.loc_host, &fk.addrs.v6addrs.dst,
- sizeof(struct in6_addr));
- }
-
- req->spec.rem_port = fk.ports.src;
- req->spec.loc_port = fk.ports.dst;
-
- if (efx->rps_hash_table) {
- /* Add it to ARFS hash table */
- spin_lock(&efx->rps_hash_lock);
- rule = efx_rps_hash_add(efx, &req->spec, &new);
- if (!rule) {
- rc = -ENOMEM;
- goto out_unlock;
- }
- if (new)
- rule->arfs_id = efx->rps_next_id++ % RPS_NO_FILTER;
- rc = rule->arfs_id;
- /* Skip if existing or pending filter already does the right thing */
- if (!new && rule->rxq_index == rxq_index &&
- rule->filter_id >= EFX_ARFS_FILTER_ID_PENDING)
- goto out_unlock;
- rule->rxq_index = rxq_index;
- rule->filter_id = EFX_ARFS_FILTER_ID_PENDING;
- spin_unlock(&efx->rps_hash_lock);
- } else {
- /* Without an ARFS hash table, we just use arfs_id 0 for all
- * filters. This means if multiple flows hash to the same
- * flow_id, all but the most recently touched will be eligible
- * for expiry.
- */
- rc = 0;
- }
-
- /* Queue the request */
- dev_hold(req->net_dev = net_dev);
- INIT_WORK(&req->work, efx_filter_rfs_work);
- req->rxq_index = rxq_index;
- req->flow_id = flow_id;
- schedule_work(&req->work);
- return rc;
-out_unlock:
- spin_unlock(&efx->rps_hash_lock);
-out_clear:
- clear_bit(slot_idx, &efx->rps_slot_map);
- return rc;
-}
-
-bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned int quota)
-{
- bool (*expire_one)(struct efx_nic *efx, u32 flow_id, unsigned int index);
- unsigned int channel_idx, index, size;
- u32 flow_id;
-
- if (!mutex_trylock(&efx->rps_mutex))
- return false;
- expire_one = efx->type->filter_rfs_expire_one;
- channel_idx = efx->rps_expire_channel;
- index = efx->rps_expire_index;
- size = efx->type->max_rx_ip_filters;
- while (quota--) {
- struct efx_channel *channel = efx_get_channel(efx, channel_idx);
- flow_id = channel->rps_flow_id[index];
-
- if (flow_id != RPS_FLOW_ID_INVALID &&
- expire_one(efx, flow_id, index)) {
- netif_info(efx, rx_status, efx->net_dev,
- "expired filter %d [queue %u flow %u]\n",
- index, channel_idx, flow_id);
- channel->rps_flow_id[index] = RPS_FLOW_ID_INVALID;
- }
- if (++index == size) {
- if (++channel_idx == efx->n_channels)
- channel_idx = 0;
- index = 0;
- }
- }
- efx->rps_expire_channel = channel_idx;
- efx->rps_expire_index = index;
-
- mutex_unlock(&efx->rps_mutex);
- return true;
-}
-
-#endif /* CONFIG_RFS_ACCEL */
-
-/**
- * efx_filter_is_mc_recipient - test whether spec is a multicast recipient
- * @spec: Specification to test
- *
- * Return: %true if the specification is a non-drop RX filter that
- * matches a local MAC address I/G bit value of 1 or matches a local
- * IPv4 or IPv6 address value in the respective multicast address
- * range. Otherwise %false.
- */
-bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec)
-{
- if (!(spec->flags & EFX_FILTER_FLAG_RX) ||
- spec->dmaq_id == EFX_FILTER_RX_DMAQ_ID_DROP)
- return false;
-
- if (spec->match_flags &
- (EFX_FILTER_MATCH_LOC_MAC | EFX_FILTER_MATCH_LOC_MAC_IG) &&
- is_multicast_ether_addr(spec->loc_mac))
- return true;
-
- if ((spec->match_flags &
- (EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_LOC_HOST)) ==
- (EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_LOC_HOST)) {
- if (spec->ether_type == htons(ETH_P_IP) &&
- ipv4_is_multicast(spec->loc_host[0]))
- return true;
- if (spec->ether_type == htons(ETH_P_IPV6) &&
- ((const u8 *)spec->loc_host)[0] == 0xff)
- return true;
- }
-
- return false;
}
--
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