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Date:	Thu, 15 Jul 2010 11:57:59 -0700
From:	Mitchell Erblich <erblichs@...thlink.net>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	netdev@...r.kernel.org, Michael Chan <mchan@...adcom.com>
Subject: Re: [PATCH 1/2] bnx2: allocate with GFP_KERNEL flag on RX path init


On Jul 15, 2010, at 7:25 AM, Stanislaw Gruszka wrote:

> Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
> ---
> drivers/net/bnx2.c |   17 +++++++++--------
> 1 files changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
> index a203f39..6de4cb7 100644
> --- a/drivers/net/bnx2.c
> +++ b/drivers/net/bnx2.c
> @@ -2664,13 +2664,13 @@ bnx2_set_mac_addr(struct bnx2 *bp, u8 *mac_addr, u32 pos)
> }
> 
> static inline int
> -bnx2_alloc_rx_page(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, u16 index)
> +bnx2_alloc_rx_page(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, u16 index, gfp_t gfp)
> {
> 	dma_addr_t mapping;
> 	struct sw_pg *rx_pg = &rxr->rx_pg_ring[index];
> 	struct rx_bd *rxbd =
> 		&rxr->rx_pg_desc_ring[RX_RING(index)][RX_IDX(index)];
> -	struct page *page = alloc_page(GFP_ATOMIC);
> +	struct page *page = alloc_page(gfp);
> 
> 	if (!page)
> 		return -ENOMEM;
> @@ -2705,7 +2705,7 @@ bnx2_free_rx_page(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, u16 index)
> }
> 
> static inline int
> -bnx2_alloc_rx_skb(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, u16 index)
> +bnx2_alloc_rx_skb(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, u16 index, gfp_t gfp)
> {
> 	struct sk_buff *skb;
> 	struct sw_bd *rx_buf = &rxr->rx_buf_ring[index];
> @@ -2713,7 +2713,7 @@ bnx2_alloc_rx_skb(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, u16 index)
> 	struct rx_bd *rxbd = &rxr->rx_desc_ring[RX_RING(index)][RX_IDX(index)];
> 	unsigned long align;
> 
> -	skb = netdev_alloc_skb(bp->dev, bp->rx_buf_size);
> +	skb = __netdev_alloc_skb(bp->dev, bp->rx_buf_size, gfp);
> 	if (skb == NULL) {
> 		return -ENOMEM;
> 	}
> @@ -2974,7 +2974,7 @@ bnx2_rx_skb(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, struct sk_buff *skb,
> 	int err;
> 	u16 prod = ring_idx & 0xffff;
> 
> -	err = bnx2_alloc_rx_skb(bp, rxr, prod);
> +	err = bnx2_alloc_rx_skb(bp, rxr, prod, GFP_KERNEL);
> 	if (unlikely(err)) {
> 		bnx2_reuse_rx_skb(bp, rxr, skb, (u16) (ring_idx >> 16), prod);
> 		if (hdr_len) {
> @@ -3039,7 +3039,8 @@ bnx2_rx_skb(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, struct sk_buff *skb,
> 			rx_pg->page = NULL;
> 
> 			err = bnx2_alloc_rx_page(bp, rxr,
> -						 RX_PG_RING_IDX(pg_prod));
> +						 RX_PG_RING_IDX(pg_prod),
> +	

> 					 GFP_ATOMIC);

Why not GFP_NOWAIT here?
This would then not use the last reserved pages of memory.
This still would remove the possibe sleep asociated with GFP_KERNEL.

Mitchell Erblich


> 			if (unlikely(err)) {
> 				rxr->rx_pg_cons = pg_cons;
> 				rxr->rx_pg_prod = pg_prod;
> @@ -5179,7 +5180,7 @@ bnx2_init_rx_ring(struct bnx2 *bp, int ring_num)
> 
> 	ring_prod = prod = rxr->rx_pg_prod;
> 	for (i = 0; i < bp->rx_pg_ring_size; i++) {
> -		if (bnx2_alloc_rx_page(bp, rxr, ring_prod) < 0) {
> +		if (bnx2_alloc_rx_page(bp, rxr, ring_prod, GFP_KERNEL) < 0) {
> 			netdev_warn(bp->dev, "init'ed rx page ring %d with %d/%d pages only\n",
> 				    ring_num, i, bp->rx_pg_ring_size);
> 			break;
> @@ -5191,7 +5192,7 @@ bnx2_init_rx_ring(struct bnx2 *bp, int ring_num)
> 
> 	ring_prod = prod = rxr->rx_prod;
> 	for (i = 0; i < bp->rx_ring_size; i++) {
> -		if (bnx2_alloc_rx_skb(bp, rxr, ring_prod) < 0) {
> +		if (bnx2_alloc_rx_skb(bp, rxr, ring_prod, GFP_KERNEL) < 0) {
> 			netdev_warn(bp->dev, "init'ed rx ring %d with %d/%d skbs only\n",
> 				    ring_num, i, bp->rx_ring_size);
> 			break;
> -- 
> 1.7.1
> 
> --
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