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bnx2x: uses build_skb() in receive path

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bnx2x uses following formula to compute its rx_buf_sz :

dev->mtu + 2*L1_CACHE_BYTES + 14 + 8 + 8 + 2

Then core network adds NET_SKB_PAD and SKB_DATA_ALIGN(sizeof(struct
skb_shared_info))

Final allocated size for skb head on x86_64 (L1_CACHE_BYTES = 64,
MTU=1500) : 2112 bytes : SLUB/SLAB round this to 4096 bytes.

Since skb truesize is then bigger than SK_MEM_QUANTUM, we have lot of
false sharing because of mem_reclaim in UDP stack.

One possible way to half truesize is to reduce the need by 64 bytes
(2112 -> 2048 bytes)

Instead of allocating a full cache line at the end of packet for
alignment, we can use the fact that skb_shared_info sits at the end of
skb->head, and we can use this room, if we convert bnx2x to new
build_skb() infrastructure.

skb_shared_info will be initialized after hardware finished its
transfert, so we can eventually overwrite the final padding.

Using build_skb() also reduces cache line misses in the driver, since we
use cache hot skb instead of cold ones. Number of in-flight sk_buff
structures is lower, they are recycled while still hot.

Performance results :

(820.000 pps on a rx UDP monothread benchmark, instead of 720.000 pps)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Eilon Greenstein <eilong@broadcom.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
CC: Tom Herbert <therbert@google.com>
CC: Jamal Hadi Salim <hadi@mojatatu.com>
CC: Stephen Hemminger <shemminger@vyatta.com>
CC: Thomas Graf <tgraf@infradead.org>
CC: Herbert Xu <herbert@gondor.apana.org.au>
CC: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-11-14 06:05:34 +00:00 committed by David S. Miller
parent b2b5ce9d1c
commit e52fcb2462
5 changed files with 170 additions and 168 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
View File

@ -293,8 +293,13 @@ enum {
#define FCOE_TXQ_IDX(bp) (MAX_ETH_TXQ_IDX(bp))
/* fast path */
/*
* This driver uses new build_skb() API :
* RX ring buffer contains pointer to kmalloc() data only,
* skb are built only after Hardware filled the frame.
*/
struct sw_rx_bd {
struct sk_buff *skb;
u8 *data;
DEFINE_DMA_UNMAP_ADDR(mapping);
};
@ -424,8 +429,8 @@ union host_hc_status_block {
struct bnx2x_agg_info {
/*
* First aggregation buffer is an skb, the following - are pages.
* We will preallocate the skbs for each aggregation when
* First aggregation buffer is a data buffer, the following - are pages.
* We will preallocate the data buffer for each aggregation when
* we open the interface and will replace the BD at the consumer
* with this one when we receive the TPA_START CQE in order to
* keep the Rx BD ring consistent.
@ -439,6 +444,7 @@ struct bnx2x_agg_info {
u16 parsing_flags;
u16 vlan_tag;
u16 len_on_bd;
u32 rxhash;
};
#define Q_STATS_OFFSET32(stat_name) \
@ -1187,10 +1193,20 @@ struct bnx2x {
#define ETH_MAX_JUMBO_PACKET_SIZE 9600
/* Max supported alignment is 256 (8 shift) */
#define BNX2X_RX_ALIGN_SHIFT ((L1_CACHE_SHIFT < 8) ? \
L1_CACHE_SHIFT : 8)
/* FW use 2 Cache lines Alignment for start packet and size */
#define BNX2X_FW_RX_ALIGN (2 << BNX2X_RX_ALIGN_SHIFT)
#define BNX2X_RX_ALIGN_SHIFT min(8, L1_CACHE_SHIFT)
/* FW uses 2 Cache lines Alignment for start packet and size
*
* We assume skb_build() uses sizeof(struct skb_shared_info) bytes
* at the end of skb->data, to avoid wasting a full cache line.
* This reduces memory use (skb->truesize).
*/
#define BNX2X_FW_RX_ALIGN_START (1UL << BNX2X_RX_ALIGN_SHIFT)
#define BNX2X_FW_RX_ALIGN_END \
max(1UL << BNX2X_RX_ALIGN_SHIFT, \
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
#define BNX2X_PXP_DRAM_ALIGN (BNX2X_RX_ALIGN_SHIFT - 5)
struct host_sp_status_block *def_status_blk;

161
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
View File

@ -294,8 +294,21 @@ static void bnx2x_update_sge_prod(struct bnx2x_fastpath *fp,
fp->last_max_sge, fp->rx_sge_prod);
}
/* Set Toeplitz hash value in the skb using the value from the
* CQE (calculated by HW).
*/
static u32 bnx2x_get_rxhash(const struct bnx2x *bp,
const struct eth_fast_path_rx_cqe *cqe)
{
/* Set Toeplitz hash from CQE */
if ((bp->dev->features & NETIF_F_RXHASH) &&
(cqe->status_flags & ETH_FAST_PATH_RX_CQE_RSS_HASH_FLG))
return le32_to_cpu(cqe->rss_hash_result);
return 0;
}
static void bnx2x_tpa_start(struct bnx2x_fastpath *fp, u16 queue,
struct sk_buff *skb, u16 cons, u16 prod,
u16 cons, u16 prod,
struct eth_fast_path_rx_cqe *cqe)
{
struct bnx2x *bp = fp->bp;
@ -310,9 +323,9 @@ static void bnx2x_tpa_start(struct bnx2x_fastpath *fp, u16 queue,
if (tpa_info->tpa_state != BNX2X_TPA_STOP)
BNX2X_ERR("start of bin not in stop [%d]\n", queue);
/* Try to map an empty skb from the aggregation info */
/* Try to map an empty data buffer from the aggregation info */
mapping = dma_map_single(&bp->pdev->dev,
first_buf->skb->data,
first_buf->data + NET_SKB_PAD,
fp->rx_buf_size, DMA_FROM_DEVICE);
/*
* ...if it fails - move the skb from the consumer to the producer
@ -322,15 +335,15 @@ static void bnx2x_tpa_start(struct bnx2x_fastpath *fp, u16 queue,
if (unlikely(dma_mapping_error(&bp->pdev->dev, mapping))) {
/* Move the BD from the consumer to the producer */
bnx2x_reuse_rx_skb(fp, cons, prod);
bnx2x_reuse_rx_data(fp, cons, prod);
tpa_info->tpa_state = BNX2X_TPA_ERROR;
return;
}
/* move empty skb from pool to prod */
prod_rx_buf->skb = first_buf->skb;
/* move empty data from pool to prod */
prod_rx_buf->data = first_buf->data;
dma_unmap_addr_set(prod_rx_buf, mapping, mapping);
/* point prod_bd to new skb */
/* point prod_bd to new data */
prod_bd->addr_hi = cpu_to_le32(U64_HI(mapping));
prod_bd->addr_lo = cpu_to_le32(U64_LO(mapping));
@ -344,6 +357,7 @@ static void bnx2x_tpa_start(struct bnx2x_fastpath *fp, u16 queue,
tpa_info->tpa_state = BNX2X_TPA_START;
tpa_info->len_on_bd = le16_to_cpu(cqe->len_on_bd);
tpa_info->placement_offset = cqe->placement_offset;
tpa_info->rxhash = bnx2x_get_rxhash(bp, cqe);
#ifdef BNX2X_STOP_ON_ERROR
fp->tpa_queue_used |= (1 << queue);
@ -471,11 +485,12 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
{
struct bnx2x_agg_info *tpa_info = &fp->tpa_info[queue];
struct sw_rx_bd *rx_buf = &tpa_info->first_buf;
u8 pad = tpa_info->placement_offset;
u32 pad = tpa_info->placement_offset;
u16 len = tpa_info->len_on_bd;
struct sk_buff *skb = rx_buf->skb;
struct sk_buff *skb = NULL;
u8 *data = rx_buf->data;
/* alloc new skb */
struct sk_buff *new_skb;
u8 *new_data;
u8 old_tpa_state = tpa_info->tpa_state;
tpa_info->tpa_state = BNX2X_TPA_STOP;
@ -486,18 +501,18 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
if (old_tpa_state == BNX2X_TPA_ERROR)
goto drop;
/* Try to allocate the new skb */
new_skb = netdev_alloc_skb(bp->dev, fp->rx_buf_size);
/* Try to allocate the new data */
new_data = kmalloc(fp->rx_buf_size + NET_SKB_PAD, GFP_ATOMIC);
/* Unmap skb in the pool anyway, as we are going to change
pool entry status to BNX2X_TPA_STOP even if new skb allocation
fails. */
dma_unmap_single(&bp->pdev->dev, dma_unmap_addr(rx_buf, mapping),
fp->rx_buf_size, DMA_FROM_DEVICE);
if (likely(new_data))
skb = build_skb(data);
if (likely(new_skb)) {
prefetch(skb);
prefetch(((char *)(skb)) + L1_CACHE_BYTES);
if (likely(skb)) {
#ifdef BNX2X_STOP_ON_ERROR
if (pad + len > fp->rx_buf_size) {
@ -509,8 +524,9 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
}
#endif
skb_reserve(skb, pad);
skb_reserve(skb, pad + NET_SKB_PAD);
skb_put(skb, len);
skb->rxhash = tpa_info->rxhash;
skb->protocol = eth_type_trans(skb, bp->dev);
skb->ip_summed = CHECKSUM_UNNECESSARY;
@ -526,8 +542,8 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
}
/* put new skb in bin */
rx_buf->skb = new_skb;
/* put new data in bin */
rx_buf->data = new_data;
return;
}
@ -539,19 +555,6 @@ drop:
fp->eth_q_stats.rx_skb_alloc_failed++;
}
/* Set Toeplitz hash value in the skb using the value from the
* CQE (calculated by HW).
*/
static inline void bnx2x_set_skb_rxhash(struct bnx2x *bp, union eth_rx_cqe *cqe,
struct sk_buff *skb)
{
/* Set Toeplitz hash from CQE */
if ((bp->dev->features & NETIF_F_RXHASH) &&
(cqe->fast_path_cqe.status_flags &
ETH_FAST_PATH_RX_CQE_RSS_HASH_FLG))
skb->rxhash =
le32_to_cpu(cqe->fast_path_cqe.rss_hash_result);
}
int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
{
@ -594,6 +597,7 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
u8 cqe_fp_flags;
enum eth_rx_cqe_type cqe_fp_type;
u16 len, pad;
u8 *data;
#ifdef BNX2X_STOP_ON_ERROR
if (unlikely(bp->panic))
@ -604,13 +608,6 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
bd_prod = RX_BD(bd_prod);
bd_cons = RX_BD(bd_cons);
/* Prefetch the page containing the BD descriptor
at producer's index. It will be needed when new skb is
allocated */
prefetch((void *)(PAGE_ALIGN((unsigned long)
(&fp->rx_desc_ring[bd_prod])) -
PAGE_SIZE + 1));
cqe = &fp->rx_comp_ring[comp_ring_cons];
cqe_fp = &cqe->fast_path_cqe;
cqe_fp_flags = cqe_fp->type_error_flags;
@ -626,12 +623,9 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
if (unlikely(CQE_TYPE_SLOW(cqe_fp_type))) {
bnx2x_sp_event(fp, cqe);
goto next_cqe;
/* this is an rx packet */
} else {
}
rx_buf = &fp->rx_buf_ring[bd_cons];
skb = rx_buf->skb;
prefetch(skb);
data = rx_buf->data;
if (!CQE_TYPE_FAST(cqe_fp_type)) {
#ifdef BNX2X_STOP_ON_ERROR
@ -650,15 +644,10 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
"calling tpa_start on queue %d\n",
queue);
bnx2x_tpa_start(fp, queue, skb,
bnx2x_tpa_start(fp, queue,
bd_cons, bd_prod,
cqe_fp);
/* Set Toeplitz hash for LRO skb */
bnx2x_set_skb_rxhash(bp, cqe, skb);
goto next_rx;
} else {
u16 queue =
cqe->end_agg_cqe.queue_index;
@ -685,8 +674,8 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
dma_unmap_addr(rx_buf, mapping),
pad + RX_COPY_THRESH,
DMA_FROM_DEVICE);
prefetch(((char *)(skb)) + L1_CACHE_BYTES);
pad += NET_SKB_PAD;
prefetch(data + pad); /* speedup eth_type_trans() */
/* is this an error packet? */
if (unlikely(cqe_fp_flags & ETH_RX_ERROR_FALGS)) {
DP(NETIF_MSG_RX_ERR,
@ -701,50 +690,43 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
*/
if ((bp->dev->mtu > ETH_MAX_PACKET_SIZE) &&
(len <= RX_COPY_THRESH)) {
struct sk_buff *new_skb;
new_skb = netdev_alloc_skb(bp->dev, len + pad);
if (new_skb == NULL) {
skb = netdev_alloc_skb_ip_align(bp->dev, len);
if (skb == NULL) {
DP(NETIF_MSG_RX_ERR,
"ERROR packet dropped "
"because of alloc failure\n");
"ERROR packet dropped because of alloc failure\n");
fp->eth_q_stats.rx_skb_alloc_failed++;
goto reuse_rx;
}
/* aligned copy */
skb_copy_from_linear_data_offset(skb, pad,
new_skb->data + pad, len);
skb_reserve(new_skb, pad);
skb_put(new_skb, len);
bnx2x_reuse_rx_skb(fp, bd_cons, bd_prod);
skb = new_skb;
} else
if (likely(bnx2x_alloc_rx_skb(bp, fp, bd_prod) == 0)) {
memcpy(skb->data, data + pad, len);
bnx2x_reuse_rx_data(fp, bd_cons, bd_prod);
} else {
if (likely(bnx2x_alloc_rx_data(bp, fp, bd_prod) == 0)) {
dma_unmap_single(&bp->pdev->dev,
dma_unmap_addr(rx_buf, mapping),
fp->rx_buf_size,
DMA_FROM_DEVICE);
skb = build_skb(data);
if (unlikely(!skb)) {
kfree(data);
fp->eth_q_stats.rx_skb_alloc_failed++;
goto next_rx;
}
skb_reserve(skb, pad);
skb_put(skb, len);
} else {
DP(NETIF_MSG_RX_ERR,
"ERROR packet dropped because "
"of alloc failure\n");
fp->eth_q_stats.rx_skb_alloc_failed++;
reuse_rx:
bnx2x_reuse_rx_skb(fp, bd_cons, bd_prod);
bnx2x_reuse_rx_data(fp, bd_cons, bd_prod);
goto next_rx;
}
skb_put(skb, len);
skb->protocol = eth_type_trans(skb, bp->dev);
/* Set Toeplitz hash for a none-LRO skb */
bnx2x_set_skb_rxhash(bp, cqe, skb);
skb->rxhash = bnx2x_get_rxhash(bp, cqe_fp);
skb_checksum_none_assert(skb);
@ -767,7 +749,7 @@ reuse_rx:
next_rx:
rx_buf->skb = NULL;
rx_buf->data = NULL;
bd_cons = NEXT_RX_IDX(bd_cons);
bd_prod = NEXT_RX_IDX(bd_prod);
@ -1013,9 +995,9 @@ void bnx2x_init_rx_rings(struct bnx2x *bp)
struct sw_rx_bd *first_buf =
&tpa_info->first_buf;
first_buf->skb = netdev_alloc_skb(bp->dev,
fp->rx_buf_size);
if (!first_buf->skb) {
first_buf->data = kmalloc(fp->rx_buf_size + NET_SKB_PAD,
GFP_ATOMIC);
if (!first_buf->data) {
BNX2X_ERR("Failed to allocate TPA "
"skb pool for queue[%d] - "
"disabling TPA on this "
@ -1118,16 +1100,16 @@ static void bnx2x_free_rx_bds(struct bnx2x_fastpath *fp)
for (i = 0; i < NUM_RX_BD; i++) {
struct sw_rx_bd *rx_buf = &fp->rx_buf_ring[i];
struct sk_buff *skb = rx_buf->skb;
u8 *data = rx_buf->data;
if (skb == NULL)
if (data == NULL)
continue;
dma_unmap_single(&bp->pdev->dev,
dma_unmap_addr(rx_buf, mapping),
fp->rx_buf_size, DMA_FROM_DEVICE);
rx_buf->skb = NULL;
dev_kfree_skb(skb);
rx_buf->data = NULL;
kfree(data);
}
}
@ -1509,6 +1491,7 @@ static inline void bnx2x_set_rx_buf_size(struct bnx2x *bp)
for_each_queue(bp, i) {
struct bnx2x_fastpath *fp = &bp->fp[i];
u32 mtu;
/* Always use a mini-jumbo MTU for the FCoE L2 ring */
if (IS_FCOE_IDX(i))
@ -1518,13 +1501,15 @@ static inline void bnx2x_set_rx_buf_size(struct bnx2x *bp)
* IP_HEADER_ALIGNMENT_PADDING to prevent a buffer
* overrun attack.
*/
fp->rx_buf_size =
BNX2X_FCOE_MINI_JUMBO_MTU + ETH_OVREHEAD +
BNX2X_FW_RX_ALIGN + IP_HEADER_ALIGNMENT_PADDING;
mtu = BNX2X_FCOE_MINI_JUMBO_MTU;
else
fp->rx_buf_size =
bp->dev->mtu + ETH_OVREHEAD +
BNX2X_FW_RX_ALIGN + IP_HEADER_ALIGNMENT_PADDING;
mtu = bp->dev->mtu;
fp->rx_buf_size = BNX2X_FW_RX_ALIGN_START +
IP_HEADER_ALIGNMENT_PADDING +
ETH_OVREHEAD +
mtu +
BNX2X_FW_RX_ALIGN_END;
/* Note : rx_buf_size doesnt take into account NET_SKB_PAD */
}
}

31
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
View File

@ -910,26 +910,27 @@ static inline int bnx2x_alloc_rx_sge(struct bnx2x *bp,
return 0;
}
static inline int bnx2x_alloc_rx_skb(struct bnx2x *bp,
static inline int bnx2x_alloc_rx_data(struct bnx2x *bp,
struct bnx2x_fastpath *fp, u16 index)
{
struct sk_buff *skb;
u8 *data;
struct sw_rx_bd *rx_buf = &fp->rx_buf_ring[index];
struct eth_rx_bd *rx_bd = &fp->rx_desc_ring[index];
dma_addr_t mapping;
skb = netdev_alloc_skb(bp->dev, fp->rx_buf_size);
if (unlikely(skb == NULL))
data = kmalloc(fp->rx_buf_size + NET_SKB_PAD, GFP_ATOMIC);
if (unlikely(data == NULL))
return -ENOMEM;
mapping = dma_map_single(&bp->pdev->dev, skb->data, fp->rx_buf_size,
mapping = dma_map_single(&bp->pdev->dev, data + NET_SKB_PAD,
fp->rx_buf_size,
DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(&bp->pdev->dev, mapping))) {
dev_kfree_skb_any(skb);
kfree(data);
return -ENOMEM;
}
rx_buf->skb = skb;
rx_buf->data = data;
dma_unmap_addr_set(rx_buf, mapping, mapping);
rx_bd->addr_hi = cpu_to_le32(U64_HI(mapping));
@ -938,12 +939,12 @@ static inline int bnx2x_alloc_rx_skb(struct bnx2x *bp,
return 0;
}
/* note that we are not allocating a new skb,
/* note that we are not allocating a new buffer,
* we are just moving one from cons to prod
* we are not creating a new mapping,
* so there is no need to check for dma_mapping_error().
*/
static inline void bnx2x_reuse_rx_skb(struct bnx2x_fastpath *fp,
static inline void bnx2x_reuse_rx_data(struct bnx2x_fastpath *fp,
u16 cons, u16 prod)
{
struct sw_rx_bd *cons_rx_buf = &fp->rx_buf_ring[cons];
@ -953,7 +954,7 @@ static inline void bnx2x_reuse_rx_skb(struct bnx2x_fastpath *fp,
dma_unmap_addr_set(prod_rx_buf, mapping,
dma_unmap_addr(cons_rx_buf, mapping));
prod_rx_buf->skb = cons_rx_buf->skb;
prod_rx_buf->data = cons_rx_buf->data;
*prod_bd = *cons_bd;
}
@ -1029,9 +1030,9 @@ static inline void bnx2x_free_tpa_pool(struct bnx2x *bp,
for (i = 0; i < last; i++) {
struct bnx2x_agg_info *tpa_info = &fp->tpa_info[i];
struct sw_rx_bd *first_buf = &tpa_info->first_buf;
struct sk_buff *skb = first_buf->skb;
u8 *data = first_buf->data;
if (skb == NULL) {
if (data == NULL) {
DP(NETIF_MSG_IFDOWN, "tpa bin %d empty on free\n", i);
continue;
}
@ -1039,8 +1040,8 @@ static inline void bnx2x_free_tpa_pool(struct bnx2x *bp,
dma_unmap_single(&bp->pdev->dev,
dma_unmap_addr(first_buf, mapping),
fp->rx_buf_size, DMA_FROM_DEVICE);
dev_kfree_skb(skb);
first_buf->skb = NULL;
kfree(data);
first_buf->data = NULL;
}
}
@ -1148,7 +1149,7 @@ static inline int bnx2x_alloc_rx_bds(struct bnx2x_fastpath *fp,
* fp->eth_q_stats.rx_skb_alloc_failed = 0
*/
for (i = 0; i < rx_ring_size; i++) {
if (bnx2x_alloc_rx_skb(bp, fp, ring_prod) < 0) {
if (bnx2x_alloc_rx_data(bp, fp, ring_prod) < 0) {
fp->eth_q_stats.rx_skb_alloc_failed++;
continue;
}

6
drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
View File

@ -1740,6 +1740,7 @@ static int bnx2x_run_loopback(struct bnx2x *bp, int loopback_mode)
struct sw_rx_bd *rx_buf;
u16 len;
int rc = -ENODEV;
u8 *data;
/* check the loopback mode */
switch (loopback_mode) {
@ -1865,10 +1866,9 @@ static int bnx2x_run_loopback(struct bnx2x *bp, int loopback_mode)
dma_sync_single_for_cpu(&bp->pdev->dev,
dma_unmap_addr(rx_buf, mapping),
fp_rx->rx_buf_size, DMA_FROM_DEVICE);
skb = rx_buf->skb;
skb_reserve(skb, cqe->fast_path_cqe.placement_offset);
data = rx_buf->data + NET_SKB_PAD + cqe->fast_path_cqe.placement_offset;
for (i = ETH_HLEN; i < pkt_size; i++)
if (*(skb->data + i) != (unsigned char) (i & 0xff))
if (*(data + i) != (unsigned char) (i & 0xff))
goto test_loopback_rx_exit;
rc = 0;

4
drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
View File

@ -2789,8 +2789,8 @@ static void bnx2x_pf_rx_q_prep(struct bnx2x *bp,
/* This should be a maximum number of data bytes that may be
* placed on the BD (not including paddings).
*/
rxq_init->buf_sz = fp->rx_buf_size - BNX2X_FW_RX_ALIGN -
IP_HEADER_ALIGNMENT_PADDING;
rxq_init->buf_sz = fp->rx_buf_size - BNX2X_FW_RX_ALIGN_START -
BNX2X_FW_RX_ALIGN_END - IP_HEADER_ALIGNMENT_PADDING;
rxq_init->cl_qzone_id = fp->cl_qzone_id;
rxq_init->tpa_agg_sz = tpa_agg_size;