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authorJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-05-13 00:17:42 -0700
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-08-11 02:33:50 -0700
commit874aeea5d01cac55c160a4e503e3ddb4db030de7 (patch)
tree2ec67fc737ebc853d954b914a70098ece1ded19b /drivers/net/sfc/rx.c
parente689cf4a042772f727450035b102579b0c01bdc7 (diff)
sfc: Move the Solarflare drivers
Moves the Solarflare drivers into drivers/net/ethernet/sfc/ and make the necessary Kconfig and Makefile changes. CC: Steve Hodgson <shodgson@solarflare.com> CC: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/sfc/rx.c')
-rw-r--r--drivers/net/sfc/rx.c749
1 files changed, 0 insertions, 749 deletions
diff --git a/drivers/net/sfc/rx.c b/drivers/net/sfc/rx.c
deleted file mode 100644
index 62e43649466e..000000000000
--- a/drivers/net/sfc/rx.c
+++ /dev/null
@@ -1,749 +0,0 @@
-/****************************************************************************
- * Driver for Solarflare Solarstorm 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.
- */
-
-#include <linux/socket.h>
-#include <linux/in.h>
-#include <linux/slab.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/udp.h>
-#include <linux/prefetch.h>
-#include <net/ip.h>
-#include <net/checksum.h>
-#include "net_driver.h"
-#include "efx.h"
-#include "nic.h"
-#include "selftest.h"
-#include "workarounds.h"
-
-/* Number of RX descriptors pushed at once. */
-#define EFX_RX_BATCH 8
-
-/* Maximum size of a buffer sharing a page */
-#define EFX_RX_HALF_PAGE ((PAGE_SIZE >> 1) - sizeof(struct efx_rx_page_state))
-
-/* Size of buffer allocated for skb header area. */
-#define EFX_SKB_HEADERS 64u
-
-/*
- * rx_alloc_method - RX buffer allocation method
- *
- * This driver supports two methods for allocating and using RX buffers:
- * each RX buffer may be backed by an skb or by an order-n page.
- *
- * When GRO is in use then the second method has a lower overhead,
- * since we don't have to allocate then free skbs on reassembled frames.
- *
- * Values:
- * - RX_ALLOC_METHOD_AUTO = 0
- * - RX_ALLOC_METHOD_SKB = 1
- * - RX_ALLOC_METHOD_PAGE = 2
- *
- * The heuristic for %RX_ALLOC_METHOD_AUTO is a simple hysteresis count
- * controlled by the parameters below.
- *
- * - Since pushing and popping descriptors are separated by the rx_queue
- * size, so the watermarks should be ~rxd_size.
- * - The performance win by using page-based allocation for GRO is less
- * than the performance hit of using page-based allocation of non-GRO,
- * so the watermarks should reflect this.
- *
- * Per channel we maintain a single variable, updated by each channel:
- *
- * rx_alloc_level += (gro_performed ? RX_ALLOC_FACTOR_GRO :
- * RX_ALLOC_FACTOR_SKB)
- * Per NAPI poll interval, we constrain rx_alloc_level to 0..MAX (which
- * limits the hysteresis), and update the allocation strategy:
- *
- * rx_alloc_method = (rx_alloc_level > RX_ALLOC_LEVEL_GRO ?
- * RX_ALLOC_METHOD_PAGE : RX_ALLOC_METHOD_SKB)
- */
-static int rx_alloc_method = RX_ALLOC_METHOD_AUTO;
-
-#define RX_ALLOC_LEVEL_GRO 0x2000
-#define RX_ALLOC_LEVEL_MAX 0x3000
-#define RX_ALLOC_FACTOR_GRO 1
-#define RX_ALLOC_FACTOR_SKB (-2)
-
-/* 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 = 90;
-
-/* This is the percentage fill level to which an RX queue will be refilled
- * when the "RX refill threshold" is reached.
- */
-static unsigned int rx_refill_limit = 95;
-
-/*
- * RX maximum head room required.
- *
- * This must be at least 1 to prevent overflow and at least 2 to allow
- * pipelined receives.
- */
-#define EFX_RXD_HEAD_ROOM 2
-
-/* Offset of ethernet header within page */
-static inline unsigned int efx_rx_buf_offset(struct efx_nic *efx,
- struct efx_rx_buffer *buf)
-{
- /* Offset is always within one page, so we don't need to consider
- * the page order.
- */
- return (((__force unsigned long) buf->dma_addr & (PAGE_SIZE - 1)) +
- efx->type->rx_buffer_hash_size);
-}
-static inline unsigned int efx_rx_buf_size(struct efx_nic *efx)
-{
- return PAGE_SIZE << efx->rx_buffer_order;
-}
-
-static u8 *efx_rx_buf_eh(struct efx_nic *efx, struct efx_rx_buffer *buf)
-{
- if (buf->is_page)
- return page_address(buf->u.page) + efx_rx_buf_offset(efx, buf);
- else
- return ((u8 *)buf->u.skb->data +
- efx->type->rx_buffer_hash_size);
-}
-
-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
-}
-
-/**
- * efx_init_rx_buffers_skb - create EFX_RX_BATCH skb-based RX buffers
- *
- * @rx_queue: Efx RX queue
- *
- * This allocates EFX_RX_BATCH skbs, maps them for DMA, and populates a
- * struct efx_rx_buffer for each one. Return a negative error code or 0
- * on success. May fail having only inserted fewer than EFX_RX_BATCH
- * buffers.
- */
-static int efx_init_rx_buffers_skb(struct efx_rx_queue *rx_queue)
-{
- struct efx_nic *efx = rx_queue->efx;
- struct net_device *net_dev = efx->net_dev;
- struct efx_rx_buffer *rx_buf;
- struct sk_buff *skb;
- int skb_len = efx->rx_buffer_len;
- unsigned index, count;
-
- for (count = 0; count < EFX_RX_BATCH; ++count) {
- index = rx_queue->added_count & rx_queue->ptr_mask;
- rx_buf = efx_rx_buffer(rx_queue, index);
-
- rx_buf->u.skb = skb = netdev_alloc_skb(net_dev, skb_len);
- if (unlikely(!skb))
- return -ENOMEM;
-
- /* Adjust the SKB for padding and checksum */
- skb_reserve(skb, NET_IP_ALIGN);
- rx_buf->len = skb_len - NET_IP_ALIGN;
- rx_buf->is_page = false;
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- rx_buf->dma_addr = pci_map_single(efx->pci_dev,
- skb->data, rx_buf->len,
- PCI_DMA_FROMDEVICE);
- if (unlikely(pci_dma_mapping_error(efx->pci_dev,
- rx_buf->dma_addr))) {
- dev_kfree_skb_any(skb);
- rx_buf->u.skb = NULL;
- return -EIO;
- }
-
- ++rx_queue->added_count;
- ++rx_queue->alloc_skb_count;
- }
-
- return 0;
-}
-
-/**
- * efx_init_rx_buffers_page - create EFX_RX_BATCH page-based RX buffers
- *
- * @rx_queue: Efx RX queue
- *
- * This allocates memory for EFX_RX_BATCH receive buffers, 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 split between two buffers,
- * then the page will either be inserted fully, or not at at all.
- */
-static int efx_init_rx_buffers_page(struct efx_rx_queue *rx_queue)
-{
- struct efx_nic *efx = rx_queue->efx;
- struct efx_rx_buffer *rx_buf;
- struct page *page;
- void *page_addr;
- struct efx_rx_page_state *state;
- dma_addr_t dma_addr;
- unsigned index, count;
-
- /* We can split a page between two buffers */
- BUILD_BUG_ON(EFX_RX_BATCH & 1);
-
- for (count = 0; count < EFX_RX_BATCH; ++count) {
- page = alloc_pages(__GFP_COLD | __GFP_COMP | GFP_ATOMIC,
- efx->rx_buffer_order);
- if (unlikely(page == NULL))
- return -ENOMEM;
- dma_addr = pci_map_page(efx->pci_dev, page, 0,
- efx_rx_buf_size(efx),
- PCI_DMA_FROMDEVICE);
- if (unlikely(pci_dma_mapping_error(efx->pci_dev, dma_addr))) {
- __free_pages(page, efx->rx_buffer_order);
- return -EIO;
- }
- page_addr = page_address(page);
- state = page_addr;
- state->refcnt = 0;
- state->dma_addr = dma_addr;
-
- page_addr += sizeof(struct efx_rx_page_state);
- dma_addr += sizeof(struct efx_rx_page_state);
-
- split:
- index = rx_queue->added_count & rx_queue->ptr_mask;
- rx_buf = efx_rx_buffer(rx_queue, index);
- rx_buf->dma_addr = dma_addr + EFX_PAGE_IP_ALIGN;
- rx_buf->u.page = page;
- rx_buf->len = efx->rx_buffer_len - EFX_PAGE_IP_ALIGN;
- rx_buf->is_page = true;
- ++rx_queue->added_count;
- ++rx_queue->alloc_page_count;
- ++state->refcnt;
-
- if ((~count & 1) && (efx->rx_buffer_len <= EFX_RX_HALF_PAGE)) {
- /* Use the second half of the page */
- get_page(page);
- dma_addr += (PAGE_SIZE >> 1);
- page_addr += (PAGE_SIZE >> 1);
- ++count;
- goto split;
- }
- }
-
- return 0;
-}
-
-static void efx_unmap_rx_buffer(struct efx_nic *efx,
- struct efx_rx_buffer *rx_buf)
-{
- if (rx_buf->is_page && rx_buf->u.page) {
- struct efx_rx_page_state *state;
-
- state = page_address(rx_buf->u.page);
- if (--state->refcnt == 0) {
- pci_unmap_page(efx->pci_dev,
- state->dma_addr,
- efx_rx_buf_size(efx),
- PCI_DMA_FROMDEVICE);
- }
- } else if (!rx_buf->is_page && rx_buf->u.skb) {
- pci_unmap_single(efx->pci_dev, rx_buf->dma_addr,
- rx_buf->len, PCI_DMA_FROMDEVICE);
- }
-}
-
-static void efx_free_rx_buffer(struct efx_nic *efx,
- struct efx_rx_buffer *rx_buf)
-{
- if (rx_buf->is_page && rx_buf->u.page) {
- __free_pages(rx_buf->u.page, efx->rx_buffer_order);
- rx_buf->u.page = NULL;
- } else if (!rx_buf->is_page && rx_buf->u.skb) {
- dev_kfree_skb_any(rx_buf->u.skb);
- rx_buf->u.skb = NULL;
- }
-}
-
-static void efx_fini_rx_buffer(struct efx_rx_queue *rx_queue,
- struct efx_rx_buffer *rx_buf)
-{
- efx_unmap_rx_buffer(rx_queue->efx, rx_buf);
- efx_free_rx_buffer(rx_queue->efx, rx_buf);
-}
-
-/* Attempt to resurrect the other receive buffer that used to share this page,
- * which had previously been passed up to the kernel and freed. */
-static void efx_resurrect_rx_buffer(struct efx_rx_queue *rx_queue,
- struct efx_rx_buffer *rx_buf)
-{
- struct efx_rx_page_state *state = page_address(rx_buf->u.page);
- struct efx_rx_buffer *new_buf;
- unsigned fill_level, index;
-
- /* +1 because efx_rx_packet() incremented removed_count. +1 because
- * we'd like to insert an additional descriptor whilst leaving
- * EFX_RXD_HEAD_ROOM for the non-recycle path */
- fill_level = (rx_queue->added_count - rx_queue->removed_count + 2);
- if (unlikely(fill_level > rx_queue->max_fill)) {
- /* We could place "state" on a list, and drain the list in
- * efx_fast_push_rx_descriptors(). For now, this will do. */
- return;
- }
-
- ++state->refcnt;
- get_page(rx_buf->u.page);
-
- index = rx_queue->added_count & rx_queue->ptr_mask;
- new_buf = efx_rx_buffer(rx_queue, index);
- new_buf->dma_addr = rx_buf->dma_addr ^ (PAGE_SIZE >> 1);
- new_buf->u.page = rx_buf->u.page;
- new_buf->len = rx_buf->len;
- new_buf->is_page = true;
- ++rx_queue->added_count;
-}
-
-/* Recycle the given rx buffer directly back into the rx_queue. There is
- * always room to add this buffer, because we've just popped a buffer. */
-static void efx_recycle_rx_buffer(struct efx_channel *channel,
- struct efx_rx_buffer *rx_buf)
-{
- struct efx_nic *efx = channel->efx;
- struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
- struct efx_rx_buffer *new_buf;
- unsigned index;
-
- if (rx_buf->is_page && efx->rx_buffer_len <= EFX_RX_HALF_PAGE &&
- page_count(rx_buf->u.page) == 1)
- efx_resurrect_rx_buffer(rx_queue, rx_buf);
-
- index = rx_queue->added_count & rx_queue->ptr_mask;
- new_buf = efx_rx_buffer(rx_queue, index);
-
- memcpy(new_buf, rx_buf, sizeof(*new_buf));
- rx_buf->u.page = NULL;
- ++rx_queue->added_count;
-}
-
-/**
- * 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->@fast_fill_limit. 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_channel *channel = efx_rx_queue_channel(rx_queue);
- unsigned fill_level;
- 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;
- }
-
- space = rx_queue->fast_fill_limit - fill_level;
- if (space < EFX_RX_BATCH)
- goto out;
-
- 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 using %s allocation\n",
- efx_rx_queue_index(rx_queue), fill_level,
- rx_queue->fast_fill_limit,
- channel->rx_alloc_push_pages ? "page" : "skb");
-
- do {
- if (channel->rx_alloc_push_pages)
- rc = efx_init_rx_buffers_page(rx_queue);
- else
- rc = efx_init_rx_buffers_skb(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 -= EFX_RX_BATCH) >= EFX_RX_BATCH);
-
- 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;
- struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
-
- /* Post an event to cause NAPI to run and refill the queue */
- efx_nic_generate_fill_event(channel);
- ++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, bool *discard,
- bool *leak_packet)
-{
- struct efx_nic *efx = rx_queue->efx;
- unsigned max_len = rx_buf->len - efx->type->rx_buffer_padding;
-
- if (likely(len <= max_len))
- return;
-
- /* The packet must be discarded, but this is only a fatal error
- * if the caller indicated it was
- */
- *discard = true;
-
- 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);
- /* If this buffer was skb-allocated, then the meta
- * data at the end of the skb will be trashed. So
- * we have no choice but to leak the fragment.
- */
- *leak_packet = !rx_buf->is_page;
- 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);
- }
-
- efx_rx_queue_channel(rx_queue)->n_rx_overlength++;
-}
-
-/* Pass a received packet up through the generic GRO stack
- *
- * Handles driverlink veto, and passes the fragment up via
- * the appropriate GRO method
- */
-static void efx_rx_packet_gro(struct efx_channel *channel,
- struct efx_rx_buffer *rx_buf,
- const u8 *eh, bool checksummed)
-{
- struct napi_struct *napi = &channel->napi_str;
- gro_result_t gro_result;
-
- /* Pass the skb/page into the GRO engine */
- if (rx_buf->is_page) {
- struct efx_nic *efx = channel->efx;
- struct page *page = rx_buf->u.page;
- struct sk_buff *skb;
-
- rx_buf->u.page = NULL;
-
- skb = napi_get_frags(napi);
- if (!skb) {
- put_page(page);
- return;
- }
-
- if (efx->net_dev->features & NETIF_F_RXHASH)
- skb->rxhash = efx_rx_buf_hash(eh);
-
- skb_shinfo(skb)->frags[0].page = page;
- skb_shinfo(skb)->frags[0].page_offset =
- efx_rx_buf_offset(efx, rx_buf);
- skb_shinfo(skb)->frags[0].size = rx_buf->len;
- skb_shinfo(skb)->nr_frags = 1;
-
- skb->len = rx_buf->len;
- skb->data_len = rx_buf->len;
- skb->truesize += rx_buf->len;
- skb->ip_summed =
- checksummed ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
-
- skb_record_rx_queue(skb, channel->channel);
-
- gro_result = napi_gro_frags(napi);
- } else {
- struct sk_buff *skb = rx_buf->u.skb;
-
- EFX_BUG_ON_PARANOID(!checksummed);
- rx_buf->u.skb = NULL;
-
- gro_result = napi_gro_receive(napi, skb);
- }
-
- if (gro_result == GRO_NORMAL) {
- channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB;
- } else if (gro_result != GRO_DROP) {
- channel->rx_alloc_level += RX_ALLOC_FACTOR_GRO;
- channel->irq_mod_score += 2;
- }
-}
-
-void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
- unsigned int len, bool checksummed, bool discard)
-{
- struct efx_nic *efx = rx_queue->efx;
- struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
- struct efx_rx_buffer *rx_buf;
- bool leak_packet = false;
-
- rx_buf = efx_rx_buffer(rx_queue, index);
-
- /* This allows the refill path to post another buffer.
- * EFX_RXD_HEAD_ROOM ensures that the slot we are using
- * isn't overwritten yet.
- */
- rx_queue->removed_count++;
-
- /* Validate the length encoded in the event vs the descriptor pushed */
- efx_rx_packet__check_len(rx_queue, rx_buf, len,
- &discard, &leak_packet);
-
- netif_vdbg(efx, rx_status, efx->net_dev,
- "RX queue %d received id %x at %llx+%x %s%s\n",
- efx_rx_queue_index(rx_queue), index,
- (unsigned long long)rx_buf->dma_addr, len,
- (checksummed ? " [SUMMED]" : ""),
- (discard ? " [DISCARD]" : ""));
-
- /* Discard packet, if instructed to do so */
- if (unlikely(discard)) {
- if (unlikely(leak_packet))
- channel->n_skbuff_leaks++;
- else
- efx_recycle_rx_buffer(channel, rx_buf);
-
- /* Don't hold off the previous receive */
- rx_buf = NULL;
- goto out;
- }
-
- /* Release card resources - assumes all RX buffers consumed in-order
- * per RX queue
- */
- efx_unmap_rx_buffer(efx, rx_buf);
-
- /* Prefetch nice and early so data will (hopefully) be in cache by
- * the time we look at it.
- */
- prefetch(efx_rx_buf_eh(efx, rx_buf));
-
- /* Pipeline receives so that we give time for packet headers to be
- * prefetched into cache.
- */
- rx_buf->len = len - efx->type->rx_buffer_hash_size;
-out:
- if (channel->rx_pkt)
- __efx_rx_packet(channel,
- channel->rx_pkt, channel->rx_pkt_csummed);
- channel->rx_pkt = rx_buf;
- channel->rx_pkt_csummed = checksummed;
-}
-
-/* Handle a received packet. Second half: Touches packet payload. */
-void __efx_rx_packet(struct efx_channel *channel,
- struct efx_rx_buffer *rx_buf, bool checksummed)
-{
- struct efx_nic *efx = channel->efx;
- struct sk_buff *skb;
- u8 *eh = efx_rx_buf_eh(efx, rx_buf);
-
- /* 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(efx, rx_buf);
- return;
- }
-
- if (!rx_buf->is_page) {
- skb = rx_buf->u.skb;
-
- prefetch(skb_shinfo(skb));
-
- skb_reserve(skb, efx->type->rx_buffer_hash_size);
- skb_put(skb, rx_buf->len);
-
- if (efx->net_dev->features & NETIF_F_RXHASH)
- skb->rxhash = efx_rx_buf_hash(eh);
-
- /* Move past the ethernet header. rx_buf->data still points
- * at the ethernet header */
- skb->protocol = eth_type_trans(skb, efx->net_dev);
-
- skb_record_rx_queue(skb, channel->channel);
- }
-
- if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM)))
- checksummed = false;
-
- if (likely(checksummed || rx_buf->is_page)) {
- efx_rx_packet_gro(channel, rx_buf, eh, checksummed);
- return;
- }
-
- /* We now own the SKB */
- skb = rx_buf->u.skb;
- rx_buf->u.skb = NULL;
-
- /* Set the SKB flags */
- skb_checksum_none_assert(skb);
-
- /* Pass the packet up */
- netif_receive_skb(skb);
-
- /* Update allocation strategy method */
- channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB;
-}
-
-void efx_rx_strategy(struct efx_channel *channel)
-{
- enum efx_rx_alloc_method method = rx_alloc_method;
-
- /* Only makes sense to use page based allocation if GRO is enabled */
- if (!(channel->efx->net_dev->features & NETIF_F_GRO)) {
- method = RX_ALLOC_METHOD_SKB;
- } else if (method == RX_ALLOC_METHOD_AUTO) {
- /* Constrain the rx_alloc_level */
- if (channel->rx_alloc_level < 0)
- channel->rx_alloc_level = 0;
- else if (channel->rx_alloc_level > RX_ALLOC_LEVEL_MAX)
- channel->rx_alloc_level = RX_ALLOC_LEVEL_MAX;
-
- /* Decide on the allocation method */
- method = ((channel->rx_alloc_level > RX_ALLOC_LEVEL_GRO) ?
- RX_ALLOC_METHOD_PAGE : RX_ALLOC_METHOD_SKB);
- }
-
- /* Push the option */
- channel->rx_alloc_push_pages = (method == RX_ALLOC_METHOD_PAGE);
-}
-
-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 = kzalloc(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;
-}
-
-void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
-{
- struct efx_nic *efx = rx_queue->efx;
- unsigned int max_fill, trigger, limit;
-
- 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;
-
- /* Initialise limit fields */
- max_fill = efx->rxq_entries - EFX_RXD_HEAD_ROOM;
- trigger = max_fill * min(rx_refill_threshold, 100U) / 100U;
- limit = max_fill * min(rx_refill_limit, 100U) / 100U;
-
- rx_queue->max_fill = max_fill;
- rx_queue->fast_fill_trigger = trigger;
- rx_queue->fast_fill_limit = limit;
-
- /* 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_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);
- efx_nic_fini_rx(rx_queue);
-
- /* Release RX buffers NB start at index 0 not current HW ptr */
- if (rx_queue->buffer) {
- for (i = 0; i <= rx_queue->ptr_mask; i++) {
- rx_buf = efx_rx_buffer(rx_queue, i);
- efx_fini_rx_buffer(rx_queue, rx_buf);
- }
- }
-}
-
-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_alloc_method, int, 0644);
-MODULE_PARM_DESC(rx_alloc_method, "Allocation method used for RX buffers");
-
-module_param(rx_refill_threshold, uint, 0444);
-MODULE_PARM_DESC(rx_refill_threshold,
- "RX descriptor ring fast/slow fill threshold (%)");
-