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sfc: factor out efx_tx_tso_header_length() and understand encapsulation

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ef100 will need to check this against NIC limits.

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 13:13:15 +01:00 committed by David S. Miller
parent 93841000ed
commit e7a256858f
2 changed files with 16 additions and 2 deletions
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17
drivers/net/ethernet/sfc/tx_common.c
View File

@ -311,6 +311,20 @@ struct efx_tx_buffer *efx_tx_map_chunk(struct efx_tx_queue *tx_queue,
return buffer;
}
int efx_tx_tso_header_length(struct sk_buff *skb)
{
size_t header_len;
if (skb->encapsulation)
header_len = skb_inner_transport_header(skb) -
skb->data +
(inner_tcp_hdr(skb)->doff << 2u);
else
header_len = skb_transport_header(skb) - skb->data +
(tcp_hdr(skb)->doff << 2u);
return header_len;
}
/* Map all data from an SKB for DMA and create descriptors on the queue. */
int efx_tx_map_data(struct efx_tx_queue *tx_queue, struct sk_buff *skb,
unsigned int segment_count)
@ -339,8 +353,7 @@ int efx_tx_map_data(struct efx_tx_queue *tx_queue, struct sk_buff *skb,
/* For TSO we need to put the header in to a separate
* descriptor. Map this separately if necessary.
*/
size_t header_len = skb_transport_header(skb) - skb->data +
(tcp_hdr(skb)->doff << 2u);
size_t header_len = efx_tx_tso_header_length(skb);
if (header_len != len) {
tx_queue->tso_long_headers++;

1
drivers/net/ethernet/sfc/tx_common.h
View File

@ -34,6 +34,7 @@ void efx_enqueue_unwind(struct efx_tx_queue *tx_queue,
struct efx_tx_buffer *efx_tx_map_chunk(struct efx_tx_queue *tx_queue,
dma_addr_t dma_addr, size_t len);
int efx_tx_tso_header_length(struct sk_buff *skb);
int efx_tx_map_data(struct efx_tx_queue *tx_queue, struct sk_buff *skb,
unsigned int segment_count);