net: bcmgenet: set RBUF_SKIP_FCS based on UniMAC CRC forwarding
authorFlorian Fainelli <f.fainelli@gmail.com>
Thu, 27 Mar 2014 04:18:39 +0000 (21:18 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 27 Mar 2014 19:49:42 +0000 (15:49 -0400)
commitebe5e3c64241bbdc256e9828392fa452bc2bfd7e
treef9491f947494882ef04bb48b408c1db80f3706b6
parentd3be267d359f621782010cd4fe4e70c9ec1cd24d
net: bcmgenet: set RBUF_SKIP_FCS based on UniMAC CRC forwarding

When the UniMAC block is configured to forward the CRC as part of the
Ethernet frame (priv->crc_fwd_en, set by default), enabling the hardware
RX checksum block unveiled that the dma_rxchk_bit was never set in the
per-packet status bits (dma_flag in bcmgenet_desc_rx). This would make
the chksum_ok variable to be never set to 1, and the networking stack
would have to compute the packet checksums, which takes a substantial
amount of time.

In order for the RXCHK block to properly compute the packet checksum in
hardware, we also need to set the RBUF_SKIP_FCS bit accordingly.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/broadcom/genet/bcmgenet.c