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sfc: Pad packets to 33 bytes to prevent TX packet parser lockup 

The packet parser used in the TX data path for locating checksum
fields can lose synchronisation with the TX queue manager when
handling packets that look like IPv4 but are too short (17-32 bytes).
Work around this by padding to 33 bytes.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2009-03-20 13:25:39 +00:00 committed by David S. Miller
parent e84665c9cb
commit bb145a9e28
2 changed files with 10 additions and 0 deletions
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8
drivers/net/sfc/tx.c
View File

@ -162,6 +162,14 @@ static int efx_enqueue_skb(struct efx_tx_queue *tx_queue,
/* Get size of the initial fragment */
len = skb_headlen(skb);
/* Pad if necessary */
if (EFX_WORKAROUND_15592(efx) && skb->len <= 32) {
EFX_BUG_ON_PARANOID(skb->data_len);
len = 32 + 1;
if (skb_pad(skb, len - skb->len))
return NETDEV_TX_OK;
}
fill_level = tx_queue->insert_count - tx_queue->old_read_count;
q_space = efx->type->txd_ring_mask - 1 - fill_level;

2
drivers/net/sfc/workarounds.h
View File

@ -36,6 +36,8 @@
#define EFX_WORKAROUND_11482 EFX_WORKAROUND_ALWAYS
/* Flush events can take a very long time to appear */
#define EFX_WORKAROUND_11557 EFX_WORKAROUND_ALWAYS
/* Truncated IPv4 packets can confuse the TX packet parser */
#define EFX_WORKAROUND_15592 EFX_WORKAROUND_ALWAYS
/* Spurious parity errors in TSORT buffers */
#define EFX_WORKAROUND_5129 EFX_WORKAROUND_FALCON_A