diff options
Diffstat (limited to 'drivers/net/sfc/rx.c')
| -rw-r--r-- | drivers/net/sfc/rx.c | 745 |
1 files changed, 0 insertions, 745 deletions
diff --git a/drivers/net/sfc/rx.c b/drivers/net/sfc/rx.c deleted file mode 100644 index 6d0959b5158..00000000000 --- a/drivers/net/sfc/rx.c +++ /dev/null @@ -1,745 +0,0 @@ -/**************************************************************************** - * Driver for Solarflare Solarstorm network controllers and boards - * Copyright 2005-2006 Fen Systems Ltd. - * Copyright 2005-2009 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 <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 LRO 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 LRO is less - * than the performance hit of using page-based allocation of non-LRO, - * so the watermarks should reflect this. - * - * Per channel we maintain a single variable, updated by each channel: - * - * rx_alloc_level += (lro_performed ? RX_ALLOC_FACTOR_LRO : - * 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_LRO ? - * RX_ALLOC_METHOD_PAGE : RX_ALLOC_METHOD_SKB) - */ -static int rx_alloc_method = RX_ALLOC_METHOD_AUTO; - -#define RX_ALLOC_LEVEL_LRO 0x2000 -#define RX_ALLOC_LEVEL_MAX 0x3000 -#define RX_ALLOC_FACTOR_LRO 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 - -static inline unsigned int efx_rx_buf_offset(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->data & (PAGE_SIZE - 1); -} -static inline unsigned int efx_rx_buf_size(struct efx_nic *efx) -{ - return PAGE_SIZE << efx->rx_buffer_order; -} - -static inline u32 efx_rx_buf_hash(struct efx_rx_buffer *buf) -{ -#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || NET_IP_ALIGN % 4 == 0 - return __le32_to_cpup((const __le32 *)(buf->data - 4)); -#else - const u8 *data = (const u8 *)(buf->data - 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; - 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->skb = netdev_alloc_skb(net_dev, skb_len); - if (unlikely(!rx_buf->skb)) - return -ENOMEM; - rx_buf->page = NULL; - - /* Adjust the SKB for padding and checksum */ - skb_reserve(rx_buf->skb, NET_IP_ALIGN); - rx_buf->len = skb_len - NET_IP_ALIGN; - rx_buf->data = (char *)rx_buf->skb->data; - rx_buf->skb->ip_summed = CHECKSUM_UNNECESSARY; - - rx_buf->dma_addr = pci_map_single(efx->pci_dev, - rx_buf->data, rx_buf->len, - PCI_DMA_FROMDEVICE); - if (unlikely(pci_dma_mapping_error(efx->pci_dev, - rx_buf->dma_addr))) { - dev_kfree_skb_any(rx_buf->skb); - rx_buf->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->skb = NULL; - rx_buf->page = page; - rx_buf->data = page_addr + EFX_PAGE_IP_ALIGN; - rx_buf->len = efx->rx_buffer_len - EFX_PAGE_IP_ALIGN; - ++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->page) { - struct efx_rx_page_state *state; - - EFX_BUG_ON_PARANOID(rx_buf->skb); - - state = page_address(rx_buf->page); - if (--state->refcnt == 0) { - pci_unmap_page(efx->pci_dev, - state->dma_addr, - efx_rx_buf_size(efx), - PCI_DMA_FROMDEVICE); - } - } else if (likely(rx_buf->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->page) { - __free_pages(rx_buf->page, efx->rx_buffer_order); - rx_buf->page = NULL; - } else if (likely(rx_buf->skb)) { - dev_kfree_skb_any(rx_buf->skb); - rx_buf->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->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->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->skb = NULL; - new_buf->page = rx_buf->page; - new_buf->data = (void *) - ((__force unsigned long)rx_buf->data ^ (PAGE_SIZE >> 1)); - new_buf->len = rx_buf->len; - ++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->page != NULL && efx->rx_buffer_len <= EFX_RX_HALF_PAGE && - page_count(rx_buf->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->page = NULL; - rx_buf->skb = 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->skb != NULL); - 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 LRO stack - * - * Handles driverlink veto, and passes the fragment up via - * the appropriate LRO method - */ -static void efx_rx_packet_lro(struct efx_channel *channel, - struct efx_rx_buffer *rx_buf, - bool checksummed) -{ - struct napi_struct *napi = &channel->napi_str; - gro_result_t gro_result; - - /* Pass the skb/page into the LRO engine */ - if (rx_buf->page) { - struct efx_nic *efx = channel->efx; - struct page *page = rx_buf->page; - struct sk_buff *skb; - - EFX_BUG_ON_PARANOID(rx_buf->skb); - rx_buf->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(rx_buf); - - skb_shinfo(skb)->frags[0].page = page; - skb_shinfo(skb)->frags[0].page_offset = - efx_rx_buf_offset(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->skb; - - EFX_BUG_ON_PARANOID(!skb); - EFX_BUG_ON_PARANOID(!checksummed); - rx_buf->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_LRO; - 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); - EFX_BUG_ON_PARANOID(!rx_buf->data); - EFX_BUG_ON_PARANOID(rx_buf->skb && rx_buf->page); - EFX_BUG_ON_PARANOID(!(rx_buf->skb || rx_buf->page)); - - /* 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(rx_buf->data); - - /* Pipeline receives so that we give time for packet headers to be - * prefetched into cache. - */ - rx_buf->len = len; -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; - - rx_buf->data += efx->type->rx_buffer_hash_size; - rx_buf->len -= efx->type->rx_buffer_hash_size; - - /* 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, rx_buf->data, rx_buf->len); - efx_free_rx_buffer(efx, rx_buf); - return; - } - - if (rx_buf->skb) { - prefetch(skb_shinfo(rx_buf->skb)); - - skb_reserve(rx_buf->skb, efx->type->rx_buffer_hash_size); - skb_put(rx_buf->skb, rx_buf->len); - - if (efx->net_dev->features & NETIF_F_RXHASH) - rx_buf->skb->rxhash = efx_rx_buf_hash(rx_buf); - - /* Move past the ethernet header. rx_buf->data still points - * at the ethernet header */ - rx_buf->skb->protocol = eth_type_trans(rx_buf->skb, - efx->net_dev); - - skb_record_rx_queue(rx_buf->skb, channel->channel); - } - - if (likely(checksummed || rx_buf->page)) { - efx_rx_packet_lro(channel, rx_buf, checksummed); - return; - } - - /* We now own the SKB */ - skb = rx_buf->skb; - rx_buf->skb = NULL; - EFX_BUG_ON_PARANOID(!skb); - - /* 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 LRO 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_LRO) ? - 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 (%)"); - |