diff options
| author | Scott Wood <scottwood@freescale.com> | 2007-10-01 21:20:52 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-11 01:54:02 +0200 |
| commit | 0d0d9c150c046cbd3e507adcfa2d78db82f1f452 (patch) | |
| tree | 9061d687f765b7cd831d8a6dce83ae925a58d994 /drivers/net | |
| parent | fs_enet: mac-fcc: Eliminate __fcc-* macros. (diff) | |
| download | linux-0d0d9c150c046cbd3e507adcfa2d78db82f1f452.tar.xz linux-0d0d9c150c046cbd3e507adcfa2d78db82f1f452.zip | |
fs_enet: Align receive buffers.
At least some hardware driven by this driver needs receive buffers
to be aligned on a 16-byte boundary. This usually happens by chance,
but it breaks if slab debugging is enabled.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/fs_enet/fs_enet-main.c | 21 | ||||
| -rw-r--r-- | drivers/net/fs_enet/fs_enet.h | 3 |
2 files changed, 21 insertions, 3 deletions
diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c index a15345ba1e59..7a0298687875 100644 --- a/drivers/net/fs_enet/fs_enet-main.c +++ b/drivers/net/fs_enet/fs_enet-main.c @@ -70,6 +70,14 @@ static void fs_set_multicast_list(struct net_device *dev) (*fep->ops->set_multicast_list)(dev); } +static void skb_align(struct sk_buff *skb, int align) +{ + int off = ((unsigned long)skb->data) & (align - 1); + + if (off) + skb_reserve(skb, align - off); +} + /* NAPI receive function */ static int fs_enet_rx_napi(struct napi_struct *napi, int budget) { @@ -159,9 +167,13 @@ static int fs_enet_rx_napi(struct napi_struct *napi, int budget) skb = skbn; skbn = skbt; } - } else + } else { skbn = dev_alloc_skb(ENET_RX_FRSIZE); + if (skbn) + skb_align(skbn, ENET_RX_ALIGN); + } + if (skbn != NULL) { skb_put(skb, pkt_len); /* Make room */ skb->protocol = eth_type_trans(skb, dev); @@ -290,9 +302,13 @@ static int fs_enet_rx_non_napi(struct net_device *dev) skb = skbn; skbn = skbt; } - } else + } else { skbn = dev_alloc_skb(ENET_RX_FRSIZE); + if (skbn) + skb_align(skbn, ENET_RX_ALIGN); + } + if (skbn != NULL) { skb_put(skb, pkt_len); /* Make room */ skb->protocol = eth_type_trans(skb, dev); @@ -502,6 +518,7 @@ void fs_init_bds(struct net_device *dev) dev->name); break; } + skb_align(skb, ENET_RX_ALIGN); fep->rx_skbuff[i] = skb; CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skb->data, diff --git a/drivers/net/fs_enet/fs_enet.h b/drivers/net/fs_enet/fs_enet.h index fbe2087d0d79..85571e49ec72 100644 --- a/drivers/net/fs_enet/fs_enet.h +++ b/drivers/net/fs_enet/fs_enet.h @@ -82,7 +82,8 @@ struct phy_info { /* Must be a multiple of 32 (to cover both FEC & FCC) */ #define PKT_MAXBLR_SIZE ((PKT_MAXBUF_SIZE + 31) & ~31) /* This is needed so that invalidate_xxx wont invalidate too much */ -#define ENET_RX_FRSIZE L1_CACHE_ALIGN(PKT_MAXBUF_SIZE) +#define ENET_RX_ALIGN 16 +#define ENET_RX_FRSIZE L1_CACHE_ALIGN(PKT_MAXBUF_SIZE + ENET_RX_ALIGN - 1) struct fs_enet_mii_bus { struct list_head list; |