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sfc: Remove bogus comment about MTU change and RX buffer overrun 

RX DMA is limited by the length specified in each descriptor and not
by the MAC.  Over-length frames may get into the RX FIFO regardless of
the MAC settings, due to a hardware bug, but they will be truncated by
the packet DMA engine and reported as such in the completion event.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2012-07-27 20:50:57 +01:00
parent 7bde852afc
commit 3f65ea5b2a
1 changed files with 0 additions and 2 deletions
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2
drivers/net/ethernet/sfc/efx.c
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@ -1953,8 +1953,6 @@ static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);
mutex_lock(&efx->mac_lock);
/* Reconfigure the MAC before enabling the dma queues so that
* the RX buffers don't overflow */
net_dev->mtu = new_mtu;
efx->type->reconfigure_mac(efx);
mutex_unlock(&efx->mac_lock);