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sfc: commonise TSO fallback code 

ef100 will need this if it gets GSO skbs it can't handle (e.g. too long
 header length).

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2020-06-30 13:12:17 +01:00 committed by David S. Miller
parent 80a0074e6a
commit 740acc15c8
3 changed files with 28 additions and 29 deletions
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28
drivers/net/ethernet/sfc/tx.c
View File

@ -268,34 +268,6 @@ static int efx_enqueue_skb_pio(struct efx_tx_queue *tx_queue,
} }
#endif /* EFX_USE_PIO */ #endif /* EFX_USE_PIO */
/*
* Fallback to software TSO.
*
* This is used if we are unable to send a GSO packet through hardware TSO.
* This should only ever happen due to per-queue restrictions - unsupported
* packets should first be filtered by the feature flags.
*
* Returns 0 on success, error code otherwise.
*/
static int efx_tx_tso_fallback(struct efx_tx_queue *tx_queue,
struct sk_buff *skb)
{
struct sk_buff *segments, *next;
segments = skb_gso_segment(skb, 0);
if (IS_ERR(segments))
return PTR_ERR(segments);
dev_consume_skb_any(skb);
skb_list_walk_safe(segments, skb, next) {
skb_mark_not_on_list(skb);
efx_enqueue_skb(tx_queue, skb);
}
return 0;
}
/* /*
* Add a socket buffer to a TX queue * Add a socket buffer to a TX queue
* *

27
drivers/net/ethernet/sfc/tx_common.c
View File

@ -405,3 +405,30 @@ unsigned int efx_tx_max_skb_descs(struct efx_nic *efx)
return max_descs; return max_descs;
} }
/*
* Fallback to software TSO.
*
* This is used if we are unable to send a GSO packet through hardware TSO.
* This should only ever happen due to per-queue restrictions - unsupported
* packets should first be filtered by the feature flags.
*
* Returns 0 on success, error code otherwise.
*/
int efx_tx_tso_fallback(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
{
struct sk_buff *segments, *next;
segments = skb_gso_segment(skb, 0);
if (IS_ERR(segments))
return PTR_ERR(segments);
dev_consume_skb_any(skb);
skb_list_walk_safe(segments, skb, next) {
skb_mark_not_on_list(skb);
efx_enqueue_skb(tx_queue, skb);
}
return 0;
}

2
drivers/net/ethernet/sfc/tx_common.h
View File

@ -38,5 +38,5 @@ int efx_tx_map_data(struct efx_tx_queue *tx_queue, struct sk_buff *skb,
unsigned int segment_count); unsigned int segment_count);
unsigned int efx_tx_max_skb_descs(struct efx_nic *efx); unsigned int efx_tx_max_skb_descs(struct efx_nic *efx);
int efx_tx_tso_fallback(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
#endif #endif