From: Alexander Duyck Date: Thu, 10 Nov 2011 09:09:17 +0000 (+0000) Subject: ixgbe: Fix broken dependency on MAX_SKB_FRAGS being related to page size X-Git-Tag: v3.3-rc4~34^2~11 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=642c680e9314fc102bc1f096f48ae3974931ef42;p=~emulex%2Finfiniband.git ixgbe: Fix broken dependency on MAX_SKB_FRAGS being related to page size This patch fixes an issue in which RSC will generate corrupted frames when PAGE_SIZE is larger than 8K. Specifically it looks like that in 2.6.39 a change was made so that GRO would always have at least 16 frags available for coalescing, but the ixgbe RSC logic was not updated. As such the RSC feature would generate a frame larger than 64K and then overflow the value in the IP length field. To correct that I am now basing things on the PAGE_SIZE. Signed-off-by: Alexander Duyck Tested-by: Stephen Ko Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 819b5c0def5..068870483f8 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -2633,22 +2633,22 @@ static void ixgbe_configure_rscctl(struct ixgbe_adapter *adapter, /* * we must limit the number of descriptors so that the * total size of max desc * buf_len is not greater - * than 65535 + * than 65536 */ if (ring_is_ps_enabled(ring)) { -#if (MAX_SKB_FRAGS > 16) +#if (PAGE_SIZE < 8192) rscctrl |= IXGBE_RSCCTL_MAXDESC_16; -#elif (MAX_SKB_FRAGS > 8) +#elif (PAGE_SIZE < 16384) rscctrl |= IXGBE_RSCCTL_MAXDESC_8; -#elif (MAX_SKB_FRAGS > 4) +#elif (PAGE_SIZE < 32768) rscctrl |= IXGBE_RSCCTL_MAXDESC_4; #else rscctrl |= IXGBE_RSCCTL_MAXDESC_1; #endif } else { - if (rx_buf_len < IXGBE_RXBUFFER_4K) + if (rx_buf_len <= IXGBE_RXBUFFER_4K) rscctrl |= IXGBE_RSCCTL_MAXDESC_16; - else if (rx_buf_len < IXGBE_RXBUFFER_8K) + else if (rx_buf_len <= IXGBE_RXBUFFER_8K) rscctrl |= IXGBE_RSCCTL_MAXDESC_8; else rscctrl |= IXGBE_RSCCTL_MAXDESC_4;