diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/tx_common.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/tx_common.c | 46 |
1 files changed, 43 insertions, 3 deletions
diff --git a/drivers/net/ethernet/sfc/tx_common.c b/drivers/net/ethernet/sfc/tx_common.c index 70876df1da69..2a058b76d1f0 100644 --- a/drivers/net/ethernet/sfc/tx_common.c +++ b/drivers/net/ethernet/sfc/tx_common.c @@ -10,7 +10,7 @@ #include "net_driver.h" #include "efx.h" -#include "nic.h" +#include "nic_common.h" #include "tx_common.h" static unsigned int efx_tx_cb_page_count(struct efx_tx_queue *tx_queue) @@ -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++; @@ -405,3 +418,30 @@ unsigned int efx_tx_max_skb_descs(struct efx_nic *efx) 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; +} |