From 604f6049ba2af86fe361d4cc320443d35b232df1 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Fri, 25 Jun 2010 07:05:33 +0000 Subject: sfc: Fix reading of inserted hash The hash appears immediately before the packet data, not at the beginning of the buffer. This means we can easily use negative offsets from the start of packet data, so adjust the data and length at the top of __efx_rx_packet() instead of wherever we consume the hash. Signed-off-by: Ben Hutchings Signed-off-by: David S. Miller --- drivers/net/sfc/rx.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'drivers/net/sfc/rx.c') diff --git a/drivers/net/sfc/rx.c b/drivers/net/sfc/rx.c index 0fb98355a092..799c461ce7b8 100644 --- a/drivers/net/sfc/rx.c +++ b/drivers/net/sfc/rx.c @@ -104,9 +104,9 @@ static inline unsigned int efx_rx_buf_size(struct efx_nic *efx) static inline u32 efx_rx_buf_hash(struct efx_rx_buffer *buf) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || NET_IP_ALIGN % 4 == 0 - return __le32_to_cpup((const __le32 *)buf->data); + return __le32_to_cpup((const __le32 *)(buf->data - 4)); #else - const u8 *data = (const u8 *)buf->data; + const u8 *data = (const u8 *)(buf->data - 4); return ((u32)data[0] | (u32)data[1] << 8 | (u32)data[2] << 16 | @@ -469,8 +469,6 @@ static void efx_rx_packet_lro(struct efx_channel *channel, if (efx->net_dev->features & NETIF_F_RXHASH) skb->rxhash = efx_rx_buf_hash(rx_buf); - rx_buf->data += efx->type->rx_buffer_hash_size; - rx_buf->len -= efx->type->rx_buffer_hash_size; skb_shinfo(skb)->frags[0].page = page; skb_shinfo(skb)->frags[0].page_offset = @@ -577,6 +575,9 @@ void __efx_rx_packet(struct efx_channel *channel, struct efx_nic *efx = channel->efx; struct sk_buff *skb; + rx_buf->data += efx->type->rx_buffer_hash_size; + rx_buf->len -= efx->type->rx_buffer_hash_size; + /* If we're in loopback test, then pass the packet directly to the * loopback layer, and free the rx_buf here */ @@ -589,11 +590,11 @@ void __efx_rx_packet(struct efx_channel *channel, if (rx_buf->skb) { prefetch(skb_shinfo(rx_buf->skb)); + skb_reserve(rx_buf->skb, efx->type->rx_buffer_hash_size); skb_put(rx_buf->skb, rx_buf->len); if (efx->net_dev->features & NETIF_F_RXHASH) rx_buf->skb->rxhash = efx_rx_buf_hash(rx_buf); - skb_pull(rx_buf->skb, efx->type->rx_buffer_hash_size); /* Move past the ethernet header. rx_buf->data still points * at the ethernet header */ -- cgit v1.2.1