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Date: Mon, 14 Nov 2011 18:48:49 +0200
From: "Eilon Greenstein" <eilong@...adcom.com>
To: "Eric Dumazet" <eric.dumazet@...il.com>
cc: "David Miller" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"Ben Hutchings" <bhutchings@...arflare.com>,
"Tom Herbert" <therbert@...gle.com>,
"Jamal Hadi Salim" <hadi@...atatu.com>,
"Stephen Hemminger" <shemminger@...tta.com>,
"Thomas Graf" <tgraf@...radead.org>,
"Herbert Xu" <herbert@...dor.apana.org.au>,
"Jeff Kirsher" <jeffrey.t.kirsher@...el.com>,
"pstaszewski@...are.pl" <pstaszewski@...are.pl>
Subject: Re: [PATCH net-next 2/2] bnx2x: uses build_skb() in receive
path
On Mon, 2011-11-14 at 08:05 -0800, Eric Dumazet wrote:
> 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)
Wow! This is very impressive. The only problem will be to back port this
driver now... But it is definitely worth the effort :)
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Acked-by: Eilon Greenstein <eilong@...adcom.com>
> CC: Eilon Greenstein <eilong@...adcom.com>
> CC: Ben Hutchings <bhutchings@...arflare.com>
> CC: Tom Herbert <therbert@...gle.com>
> CC: Jamal Hadi Salim <hadi@...atatu.com>
> CC: Stephen Hemminger <shemminger@...tta.com>
> CC: Thomas Graf <tgraf@...radead.org>
> CC: Herbert Xu <herbert@...dor.apana.org.au>
> CC: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
> drivers/net/ethernet/broadcom/bnx2x/bnx2x.h | 30 -
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 265 ++++------
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h | 33 -
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c | 6
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 4
> 5 files changed, 170 insertions(+), 168 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
> index 4b90b51..0f7b7a4 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
> @@ -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;
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> index 13dad92..0d60b9e 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> @@ -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;
> @@ -626,125 +623,110 @@ 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;
> + }
> + rx_buf = &fp->rx_buf_ring[bd_cons];
> + data = rx_buf->data;
>
> - /* this is an rx packet */
> - } else {
> - rx_buf = &fp->rx_buf_ring[bd_cons];
> - skb = rx_buf->skb;
> - prefetch(skb);
> -
> - if (!CQE_TYPE_FAST(cqe_fp_type)) {
> + if (!CQE_TYPE_FAST(cqe_fp_type)) {
> #ifdef BNX2X_STOP_ON_ERROR
> - /* sanity check */
> - if (fp->disable_tpa &&
> - (CQE_TYPE_START(cqe_fp_type) ||
> - CQE_TYPE_STOP(cqe_fp_type)))
> - BNX2X_ERR("START/STOP packet while "
> - "disable_tpa type %x\n",
> - CQE_TYPE(cqe_fp_type));
> + /* sanity check */
> + if (fp->disable_tpa &&
> + (CQE_TYPE_START(cqe_fp_type) ||
> + CQE_TYPE_STOP(cqe_fp_type)))
> + BNX2X_ERR("START/STOP packet while "
> + "disable_tpa type %x\n",
> + CQE_TYPE(cqe_fp_type));
> #endif
>
> - if (CQE_TYPE_START(cqe_fp_type)) {
> - u16 queue = cqe_fp->queue_index;
> - DP(NETIF_MSG_RX_STATUS,
> - "calling tpa_start on queue %d\n",
> - queue);
> -
> - bnx2x_tpa_start(fp, queue, skb,
> - bd_cons, bd_prod,
> - cqe_fp);
> -
> - /* Set Toeplitz hash for LRO skb */
> - bnx2x_set_skb_rxhash(bp, cqe, skb);
> -
> - goto next_rx;
> + if (CQE_TYPE_START(cqe_fp_type)) {
> + u16 queue = cqe_fp->queue_index;
> + DP(NETIF_MSG_RX_STATUS,
> + "calling tpa_start on queue %d\n",
> + queue);
>
> - } else {
> - u16 queue =
> - cqe->end_agg_cqe.queue_index;
> - DP(NETIF_MSG_RX_STATUS,
> - "calling tpa_stop on queue %d\n",
> - queue);
> + bnx2x_tpa_start(fp, queue,
> + bd_cons, bd_prod,
> + cqe_fp);
> + goto next_rx;
> + } else {
> + u16 queue =
> + cqe->end_agg_cqe.queue_index;
> + DP(NETIF_MSG_RX_STATUS,
> + "calling tpa_stop on queue %d\n",
> + queue);
>
> - bnx2x_tpa_stop(bp, fp, queue,
> - &cqe->end_agg_cqe,
> - comp_ring_cons);
> + bnx2x_tpa_stop(bp, fp, queue,
> + &cqe->end_agg_cqe,
> + comp_ring_cons);
> #ifdef BNX2X_STOP_ON_ERROR
> - if (bp->panic)
> - return 0;
> + if (bp->panic)
> + return 0;
> #endif
>
> - bnx2x_update_sge_prod(fp, cqe_fp);
> - goto next_cqe;
> - }
> + bnx2x_update_sge_prod(fp, cqe_fp);
> + goto next_cqe;
> }
> - /* non TPA */
> - len = le16_to_cpu(cqe_fp->pkt_len);
> - pad = cqe_fp->placement_offset;
> - dma_sync_single_for_cpu(&bp->pdev->dev,
> + }
> + /* non TPA */
> + len = le16_to_cpu(cqe_fp->pkt_len);
> + pad = cqe_fp->placement_offset;
> + dma_sync_single_for_cpu(&bp->pdev->dev,
> dma_unmap_addr(rx_buf, mapping),
> - pad + RX_COPY_THRESH,
> - DMA_FROM_DEVICE);
> - prefetch(((char *)(skb)) + L1_CACHE_BYTES);
> + pad + RX_COPY_THRESH,
> + DMA_FROM_DEVICE);
> + 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,
> + "ERROR flags %x rx packet %u\n",
> + cqe_fp_flags, sw_comp_cons);
> + fp->eth_q_stats.rx_err_discard_pkt++;
> + goto reuse_rx;
> + }
>
> - /* is this an error packet? */
> - if (unlikely(cqe_fp_flags & ETH_RX_ERROR_FALGS)) {
> + /* Since we don't have a jumbo ring
> + * copy small packets if mtu > 1500
> + */
> + if ((bp->dev->mtu > ETH_MAX_PACKET_SIZE) &&
> + (len <= RX_COPY_THRESH)) {
> + skb = netdev_alloc_skb_ip_align(bp->dev, len);
> + if (skb == NULL) {
> DP(NETIF_MSG_RX_ERR,
> - "ERROR flags %x rx packet %u\n",
> - cqe_fp_flags, sw_comp_cons);
> - fp->eth_q_stats.rx_err_discard_pkt++;
> + "ERROR packet dropped because of alloc failure\n");
> + fp->eth_q_stats.rx_skb_alloc_failed++;
> goto reuse_rx;
> }
> -
> - /* Since we don't have a jumbo ring
> - * copy small packets if mtu > 1500
> - */
> - 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) {
> - DP(NETIF_MSG_RX_ERR,
> - "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),
> + 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 */
> }
> }
>
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
> index 260226d..41eb17e 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
> @@ -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,
> - struct bnx2x_fastpath *fp, u16 index)
> +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;
> }
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
> index f6402fa..ec31871 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
> @@ -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;
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
> index 33ff60d..80fb9b5 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
> @@ -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;
>
>
> --
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