UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

sfc: Remove rx_alloc_method SKB 

[bwh: Remove more dead code, and make efx_ptp_rx() pull the data it
 needs into the header area.]
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Alexandre Rames 2013-01-11 12:26:21 +00:00 committed by Ben Hutchings
parent 9230451af9
commit 97d48a10c6
5 changed files with 102 additions and 266 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ethernet/sfc/efx.c
View File

@ -247,10 +247,8 @@ static int efx_process_channel(struct efx_channel *channel, int budget)
__efx_rx_packet(channel, channel->rx_pkt);
channel->rx_pkt = NULL;
}
if (rx_queue->enabled) {
efx_rx_strategy(channel);
if (rx_queue->enabled)
efx_fast_push_rx_descriptors(rx_queue);
}
}
return spent;
@ -655,16 +653,12 @@ static void efx_start_datapath(struct efx_nic *efx)
efx_for_each_channel_tx_queue(tx_queue, channel)
efx_init_tx_queue(tx_queue);
/* The rx buffer allocation strategy is MTU dependent */
efx_rx_strategy(channel);
efx_for_each_channel_rx_queue(rx_queue, channel) {
efx_init_rx_queue(rx_queue);
efx_nic_generate_fill_event(rx_queue);
}
WARN_ON(channel->rx_pkt != NULL);
efx_rx_strategy(channel);
}
if (netif_device_present(efx->net_dev))

1
drivers/net/ethernet/sfc/efx.h
View File

@ -37,7 +37,6 @@ extern int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
extern void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
extern void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
extern void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
extern void efx_rx_strategy(struct efx_channel *channel);
extern void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue);
extern void efx_rx_slow_fill(unsigned long context);
extern void __efx_rx_packet(struct efx_channel *channel,

23
drivers/net/ethernet/sfc/net_driver.h
View File

@ -206,25 +206,19 @@ struct efx_tx_queue {
/**
* struct efx_rx_buffer - An Efx RX data buffer
* @dma_addr: DMA base address of the buffer
* @skb: The associated socket buffer. Valid iff !(@flags & %EFX_RX_BUF_PAGE).
* @page: The associated page buffer.
* Will be %NULL if the buffer slot is currently free.
* @page: The associated page buffer. Valif iff @flags & %EFX_RX_BUF_PAGE.
* Will be %NULL if the buffer slot is currently free.
* @page_offset: Offset within page. Valid iff @flags & %EFX_RX_BUF_PAGE.
* @page_offset: Offset within page
* @len: Buffer length, in bytes.
* @flags: Flags for buffer and packet state.
*/
struct efx_rx_buffer {
dma_addr_t dma_addr;
union {
struct sk_buff *skb;
struct page *page;
} u;
struct page *page;
u16 page_offset;
u16 len;
u16 flags;
};
#define EFX_RX_BUF_PAGE 0x0001
#define EFX_RX_PKT_CSUMMED 0x0002
#define EFX_RX_PKT_DISCARD 0x0004
@ -266,8 +260,6 @@ struct efx_rx_page_state {
* @min_fill: RX descriptor minimum non-zero fill level.
* This records the minimum fill level observed when a ring
* refill was triggered.
* @alloc_page_count: RX allocation strategy counter.
* @alloc_skb_count: RX allocation strategy counter.
* @slow_fill: Timer used to defer efx_nic_generate_fill_event().
*/
struct efx_rx_queue {
@ -286,8 +278,6 @@ struct efx_rx_queue {
unsigned int fast_fill_trigger;
unsigned int min_fill;
unsigned int min_overfill;
unsigned int alloc_page_count;
unsigned int alloc_skb_count;
struct timer_list slow_fill;
unsigned int slow_fill_count;
};
@ -336,10 +326,6 @@ enum efx_rx_alloc_method {
* @event_test_cpu: Last CPU to handle interrupt or test event for this channel
* @irq_count: Number of IRQs since last adaptive moderation decision
* @irq_mod_score: IRQ moderation score
* @rx_alloc_level: Watermark based heuristic counter for pushing descriptors
* and diagnostic counters
* @rx_alloc_push_pages: RX allocation method currently in use for pushing
* descriptors
* @n_rx_tobe_disc: Count of RX_TOBE_DISC errors
* @n_rx_ip_hdr_chksum_err: Count of RX IP header checksum errors
* @n_rx_tcp_udp_chksum_err: Count of RX TCP and UDP checksum errors
@ -371,9 +357,6 @@ struct efx_channel {
unsigned int rfs_filters_added;
#endif
int rx_alloc_level;
int rx_alloc_push_pages;
unsigned n_rx_tobe_disc;
unsigned n_rx_ip_hdr_chksum_err;
unsigned n_rx_tcp_udp_chksum_err;

4
drivers/net/ethernet/sfc/ptp.c
View File

@ -1000,7 +1000,7 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
/* Correct version? */
if (ptp->mode == MC_CMD_PTP_MODE_V1) {
if (skb->len < PTP_V1_MIN_LENGTH) {
if (!pskb_may_pull(skb, PTP_V1_MIN_LENGTH)) {
return false;
}
version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]);
@ -1014,7 +1014,7 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
match_data_012 = skb->data + PTP_V1_UUID_OFFSET;
match_data_345 = skb->data + PTP_V1_UUID_OFFSET + 3;
} else {
if (skb->len < PTP_V2_MIN_LENGTH) {
if (!pskb_may_pull(skb, PTP_V2_MIN_LENGTH)) {
return false;
}
version = skb->data[PTP_V2_VERSION_OFFSET];

332
drivers/net/ethernet/sfc/rx.c
View File

@ -33,46 +33,6 @@
/* 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.
*/
@ -99,10 +59,7 @@ static inline unsigned int efx_rx_buf_size(struct efx_nic *efx)
static u8 *efx_rx_buf_eh(struct efx_nic *efx, struct efx_rx_buffer *buf)
{
if (buf->flags & EFX_RX_BUF_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;
return page_address(buf->page) + efx_rx_buf_offset(efx, buf);
}
static inline u32 efx_rx_buf_hash(const u8 *eh)
@ -120,56 +77,7 @@ static inline u32 efx_rx_buf_hash(const u8 *eh)
}
/**
* 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 */
skb_reserve(skb, NET_IP_ALIGN);
rx_buf->len = skb_len - NET_IP_ALIGN;
rx_buf->flags = 0;
rx_buf->dma_addr = dma_map_single(&efx->pci_dev->dev,
skb->data, rx_buf->len,
DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(&efx->pci_dev->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
* efx_init_rx_buffers - create EFX_RX_BATCH page-based RX buffers
*
* @rx_queue: Efx RX queue
*
@ -178,7 +86,7 @@ static int efx_init_rx_buffers_skb(struct efx_rx_queue *rx_queue)
* 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)
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;
@ -214,12 +122,11 @@ static int efx_init_rx_buffers_page(struct efx_rx_queue *rx_queue)
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->page = page;
rx_buf->page_offset = page_offset + EFX_PAGE_IP_ALIGN;
rx_buf->len = efx->rx_buffer_len - EFX_PAGE_IP_ALIGN;
rx_buf->flags = EFX_RX_BUF_PAGE;
rx_buf->flags = 0;
++rx_queue->added_count;
++rx_queue->alloc_page_count;
++state->refcnt;
if ((~count & 1) && (efx->rx_buffer_len <= EFX_RX_HALF_PAGE)) {
@ -239,10 +146,10 @@ static void efx_unmap_rx_buffer(struct efx_nic *efx,
struct efx_rx_buffer *rx_buf,
unsigned int used_len)
{
if ((rx_buf->flags & EFX_RX_BUF_PAGE) && rx_buf->u.page) {
if (rx_buf->page) {
struct efx_rx_page_state *state;
state = page_address(rx_buf->u.page);
state = page_address(rx_buf->page);
if (--state->refcnt == 0) {
dma_unmap_page(&efx->pci_dev->dev,
state->dma_addr,
@ -253,21 +160,15 @@ static void efx_unmap_rx_buffer(struct efx_nic *efx,
rx_buf->dma_addr, used_len,
DMA_FROM_DEVICE);
}
} else if (!(rx_buf->flags & EFX_RX_BUF_PAGE) && rx_buf->u.skb) {
dma_unmap_single(&efx->pci_dev->dev, rx_buf->dma_addr,
rx_buf->len, DMA_FROM_DEVICE);
}
}
static void efx_free_rx_buffer(struct efx_nic *efx,
struct efx_rx_buffer *rx_buf)
{
if ((rx_buf->flags & EFX_RX_BUF_PAGE) && rx_buf->u.page) {
__free_pages(rx_buf->u.page, efx->rx_buffer_order);
rx_buf->u.page = NULL;
} else if (!(rx_buf->flags & EFX_RX_BUF_PAGE) && rx_buf->u.skb) {
dev_kfree_skb_any(rx_buf->u.skb);
rx_buf->u.skb = NULL;
if (rx_buf->page) {
__free_pages(rx_buf->page, efx->rx_buffer_order);
rx_buf->page = NULL;
}
}
@ -283,7 +184,7 @@ static void efx_fini_rx_buffer(struct efx_rx_queue *rx_queue,
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_page_state *state = page_address(rx_buf->page);
struct efx_rx_buffer *new_buf;
unsigned fill_level, index;
@ -298,14 +199,13 @@ static void efx_resurrect_rx_buffer(struct efx_rx_queue *rx_queue,
}
++state->refcnt;
get_page(rx_buf->u.page);
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->u.page = rx_buf->u.page;
new_buf->page = rx_buf->page;
new_buf->len = rx_buf->len;
new_buf->flags = EFX_RX_BUF_PAGE;
++rx_queue->added_count;
}
@ -319,18 +219,17 @@ static void efx_recycle_rx_buffer(struct efx_channel *channel,
struct efx_rx_buffer *new_buf;
unsigned index;
rx_buf->flags &= EFX_RX_BUF_PAGE;
rx_buf->flags = 0;
if ((rx_buf->flags & EFX_RX_BUF_PAGE) &&
efx->rx_buffer_len <= EFX_RX_HALF_PAGE &&
page_count(rx_buf->u.page) == 1)
if (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->u.page = NULL;
rx_buf->page = NULL;
++rx_queue->added_count;
}
@ -348,7 +247,6 @@ static void efx_recycle_rx_buffer(struct efx_channel *channel,
*/
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;
@ -369,16 +267,13 @@ void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue)
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",
" level %d to level %d\n",
efx_rx_queue_index(rx_queue), fill_level,
rx_queue->max_fill,
channel->rx_alloc_push_pages ? "page" : "skb");
rx_queue->max_fill);
do {
if (channel->rx_alloc_push_pages)
rc = efx_init_rx_buffers_page(rx_queue);
else
rc = efx_init_rx_buffers_skb(rx_queue);
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)
@ -408,7 +303,7 @@ void efx_rx_slow_fill(unsigned long context)
static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
struct efx_rx_buffer *rx_buf,
int len, bool *leak_packet)
int len)
{
struct efx_nic *efx = rx_queue->efx;
unsigned max_len = rx_buf->len - efx->type->rx_buffer_padding;
@ -428,11 +323,6 @@ static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
"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->flags & EFX_RX_BUF_PAGE);
efx_schedule_reset(efx, RESET_TYPE_RX_RECOVERY);
} else {
if (net_ratelimit())
@ -454,51 +344,78 @@ static void efx_rx_packet_gro(struct efx_channel *channel,
{
struct napi_struct *napi = &channel->napi_str;
gro_result_t gro_result;
struct efx_nic *efx = channel->efx;
struct page *page = rx_buf->page;
struct sk_buff *skb;
if (rx_buf->flags & EFX_RX_BUF_PAGE) {
struct efx_nic *efx = channel->efx;
struct page *page = rx_buf->u.page;
struct sk_buff *skb;
rx_buf->page = NULL;
rx_buf->u.page = NULL;
skb = napi_get_frags(napi);
if (!skb) {
put_page(page);
return;
}
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);
if (efx->net_dev->features & NETIF_F_RXHASH)
skb->rxhash = efx_rx_buf_hash(eh);
skb_fill_page_desc(skb, 0, page,
efx_rx_buf_offset(efx, rx_buf), rx_buf->len);
skb_fill_page_desc(skb, 0, page,
efx_rx_buf_offset(efx, rx_buf), rx_buf->len);
skb->len = rx_buf->len;
skb->data_len = rx_buf->len;
skb->truesize += rx_buf->len;
skb->ip_summed = ((rx_buf->flags & EFX_RX_PKT_CSUMMED) ?
CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
skb->len = rx_buf->len;
skb->data_len = rx_buf->len;
skb->truesize += rx_buf->len;
skb->ip_summed = ((rx_buf->flags & EFX_RX_PKT_CSUMMED) ?
CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
skb_record_rx_queue(skb, channel->rx_queue.core_index);
skb_record_rx_queue(skb, channel->rx_queue.core_index);
gro_result = napi_gro_frags(napi);
} else {
struct sk_buff *skb = rx_buf->u.skb;
EFX_BUG_ON_PARANOID(!(rx_buf->flags & EFX_RX_PKT_CSUMMED));
rx_buf->u.skb = NULL;
skb->ip_summed = CHECKSUM_UNNECESSARY;
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;
if (gro_result != GRO_DROP)
channel->irq_mod_score += 2;
}
/* Allocate and construct an SKB around a struct page.*/
static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel,
struct efx_rx_buffer *rx_buf,
u8 *eh, int hdr_len)
{
struct efx_nic *efx = channel->efx;
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))
return NULL;
EFX_BUG_ON_PARANOID(rx_buf->len < hdr_len);
skb_reserve(skb, EFX_PAGE_SKB_ALIGN);
skb->len = rx_buf->len;
skb->truesize = rx_buf->len + sizeof(struct sk_buff);
memcpy(skb->data, eh, hdr_len);
skb->tail += hdr_len;
/* Append the remaining page onto the frag list */
if (rx_buf->len > hdr_len) {
skb->data_len = skb->len - hdr_len;
skb_fill_page_desc(skb, 0, rx_buf->page,
efx_rx_buf_offset(efx, rx_buf) + hdr_len,
skb->data_len);
} else {
__free_pages(rx_buf->page, efx->rx_buffer_order);
skb->data_len = 0;
}
/* Ownership has transferred from the rx_buf to skb */
rx_buf->page = NULL;
/* Move past the ethernet header */
skb->protocol = eth_type_trans(skb, efx->net_dev);
return skb;
}
void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
@ -507,7 +424,6 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
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);
rx_buf->flags |= flags;
@ -519,7 +435,7 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
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, &leak_packet);
efx_rx_packet__check_len(rx_queue, rx_buf, len);
netif_vdbg(efx, rx_status, efx->net_dev,
"RX queue %d received id %x at %llx+%x %s%s\n",
@ -530,10 +446,7 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
/* Discard packet, if instructed to do so */
if (unlikely(rx_buf->flags & EFX_RX_PKT_DISCARD)) {
if (unlikely(leak_packet))
channel->n_skbuff_leaks++;
else
efx_recycle_rx_buffer(channel, rx_buf);
efx_recycle_rx_buffer(channel, rx_buf);
/* Don't hold off the previous receive */
rx_buf = NULL;
@ -560,31 +473,28 @@ out:
channel->rx_pkt = rx_buf;
}
static void efx_rx_deliver(struct efx_channel *channel,
static void efx_rx_deliver(struct efx_channel *channel, u8 *eh,
struct efx_rx_buffer *rx_buf)
{
struct sk_buff *skb;
u16 hdr_len = min_t(u16, rx_buf->len, EFX_SKB_HEADERS);
/* We now own the SKB */
skb = rx_buf->u.skb;
rx_buf->u.skb = NULL;
skb = efx_rx_mk_skb(channel, rx_buf, eh, hdr_len);
if (unlikely(skb == NULL)) {
efx_free_rx_buffer(channel->efx, rx_buf);
return;
}
skb_record_rx_queue(skb, channel->rx_queue.core_index);
/* Set the SKB flags */
skb_checksum_none_assert(skb);
/* Record the rx_queue */
skb_record_rx_queue(skb, channel->rx_queue.core_index);
if (channel->type->receive_skb)
if (channel->type->receive_skb(channel, skb))
goto handled;
return;
/* Pass the packet up */
netif_receive_skb(skb);
handled:
/* Update allocation strategy method */
channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB;
}
/* Handle a received packet. Second half: Touches packet payload. */
@ -602,60 +512,13 @@ void __efx_rx_packet(struct efx_channel *channel, struct efx_rx_buffer *rx_buf)
return;
}
if (!(rx_buf->flags & EFX_RX_BUF_PAGE)) {
struct sk_buff *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->rx_queue.core_index);
}
if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM)))
rx_buf->flags &= ~EFX_RX_PKT_CSUMMED;
if (likely(rx_buf->flags & (EFX_RX_BUF_PAGE | EFX_RX_PKT_CSUMMED)) &&
!channel->type->receive_skb)
if (!channel->type->receive_skb)
efx_rx_packet_gro(channel, rx_buf, eh);
else
efx_rx_deliver(channel, rx_buf);
}
void efx_rx_strategy(struct efx_channel *channel)
{
enum efx_rx_alloc_method method = rx_alloc_method;
if (channel->type->receive_skb) {
channel->rx_alloc_push_pages = false;
return;
}
/* 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);
efx_rx_deliver(channel, eh, rx_buf);
}
int efx_probe_rx_queue(struct efx_rx_queue *rx_queue)
@ -756,9 +619,6 @@ void efx_remove_rx_queue(struct efx_rx_queue *rx_queue)
}
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 refill threshold (%)");