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| author |   Florian Fainelli <f.fainelli@gmail.com> | 2014-03-26 21:18:39 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-03-27 15:49:42 -0400 |
| commit | ebe5e3c64241bbdc256e9828392fa452bc2bfd7e (patch) | |
| tree | f9491f947494882ef04bb48b408c1db80f3706b6 /drivers | |
| parent | yam: replace del_timer by del_timer_sync (diff) | |
| download | linux-dev-ebe5e3c64241bbdc256e9828392fa452bc2bfd7e.tar.xz linux-dev-ebe5e3c64241bbdc256e9828392fa452bc2bfd7e.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/broadcom/genet/bcmgenet.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c index 8f87fe001541..adf8acbddf56 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -416,6 +416,15 @@ static int bcmgenet_set_rx_csum(struct net_device *dev, else rbuf_chk_ctrl &= ~RBUF_RXCHK_EN; priv->desc_rxchk_en = rx_csum_en; + + /* If UniMAC forwards CRC, we need to skip over it to get + * a valid CHK bit to be set in the per-packet status word + */ + if (rx_csum_en && priv->crc_fwd_en) + rbuf_chk_ctrl |= RBUF_SKIP_FCS; + else + rbuf_chk_ctrl &= ~RBUF_SKIP_FCS; + bcmgenet_rbuf_writel(priv, rbuf_chk_ctrl, RBUF_CHK_CTRL); return 0; |