diff options
| author | Ben Hutchings <bhutchings@solarflare.com> | 2008-05-07 11:51:12 (GMT) |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-05-13 05:31:40 (GMT) |
| commit | b9b39b625cf57cd0ea998717598b68963cbec3cb (patch) | |
| tree | 19f358d15b6c75d660cf1ea369559f58ad9f0c1e /drivers/net/sfc/net_driver.h | |
| parent | 48cfb14f8b89d4d5b3df6c16f08b258686fb12ad (diff) | |
| download | linux-b9b39b625cf57cd0ea998717598b68963cbec3cb.tar.xz | |
[netdrvr] sfc: Add TSO support
The SFC4000 controller does not have hardware support for TSO, and the
core GSO code incurs a high cost in allocating and freeing skbs. This
TSO implementation uses lightweight packet header structures and is
substantially faster.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/sfc/net_driver.h')
| -rw-r--r-- | drivers/net/sfc/net_driver.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h index c505482..6ffa711 100644 --- a/drivers/net/sfc/net_driver.h +++ b/drivers/net/sfc/net_driver.h @@ -134,6 +134,8 @@ struct efx_special_buffer { * Set only on the final fragment of a packet; %NULL for all other * fragments. When this fragment completes, then we can free this * skb. + * @tsoh: The associated TSO header structure, or %NULL if this + * buffer is not a TSO header. * @dma_addr: DMA address of the fragment. * @len: Length of this fragment. * This field is zero when the queue slot is empty. @@ -144,6 +146,7 @@ struct efx_special_buffer { */ struct efx_tx_buffer { const struct sk_buff *skb; + struct efx_tso_header *tsoh; dma_addr_t dma_addr; unsigned short len; unsigned char continuation; @@ -187,6 +190,13 @@ struct efx_tx_buffer { * variable indicates that the queue is full. This is to * avoid cache-line ping-pong between the xmit path and the * completion path. + * @tso_headers_free: A list of TSO headers allocated for this TX queue + * that are not in use, and so available for new TSO sends. The list + * is protected by the TX queue lock. + * @tso_bursts: Number of times TSO xmit invoked by kernel + * @tso_long_headers: Number of packets with headers too long for standard + * blocks + * @tso_packets: Number of packets via the TSO xmit path */ struct efx_tx_queue { /* Members which don't change on the fast path */ @@ -206,6 +216,10 @@ struct efx_tx_queue { unsigned int insert_count ____cacheline_aligned_in_smp; unsigned int write_count; unsigned int old_read_count; + struct efx_tso_header *tso_headers_free; + unsigned int tso_bursts; + unsigned int tso_long_headers; + unsigned int tso_packets; }; /** |