diff options
| author |   Martin Habets <mhabets@solarflare.com> | 2018-01-25 17:24:43 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-01-25 16:05:13 -0500 |
| commit | b9b603d46d5aad1fb66fa007759193e82a50c680 (patch) | |
| tree | d9d0a733ccd7ec6d78262c2ba5cbfce6023ed5cb /drivers/net/ethernet/sfc/net_driver.h | |
| parent | sfc: remove tx and MCDI handling from NAPI budget consideration (diff) | |
| download | linux-dev-b9b603d46d5aad1fb66fa007759193e82a50c680.tar.xz linux-dev-b9b603d46d5aad1fb66fa007759193e82a50c680.zip | |
sfc: handle TX timestamps in the normal data path
Before this work, TX timestamping is done by sending each SKB to the MC.
On the 8000 series (Medford1) we have high speed timestamping via the
MAC, which means we can use normal TX queues for this without a
significant drop in bandwidth. On the X2000 series (Medford2) support
for transmitting via the MC is removed, so the new way must be used.
This patch enables timestamping on a TX queue, if requested.
It also enhances TX event handling to process the extra completion events,
and puts the time in the SKB.
Signed-off-by: Martin Habets <mhabets@solarflare.com>
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sfc/net_driver.h')
| -rw-r--r-- | drivers/net/ethernet/sfc/net_driver.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index 3dd42f3136fe..6b9935f65cfa 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -191,6 +191,7 @@ struct efx_tx_buffer { * Size of the region is efx_piobuf_size. * @piobuf_offset: Buffer offset to be specified in PIO descriptors * @initialised: Has hardware queue been initialised? + * @timestamping: Is timestamping enabled for this channel? * @handle_tso: TSO xmit preparation handler. Sets up the TSO metadata and * may also map tx data, depending on the nature of the TSO implementation. * @read_count: Current read pointer. @@ -202,6 +203,10 @@ struct efx_tx_buffer { * avoid cache-line ping-pong between the xmit path and the * completion path. * @merge_events: Number of TX merged completion events + * @completed_desc_ptr: Most recent completed pointer - only used with + * timestamping. + * @completed_timestamp_major: Top part of the most recent tx timestamp. + * @completed_timestamp_minor: Low part of the most recent tx timestamp. * @insert_count: Current insert pointer * This is the number of buffers that have been added to the * software ring. @@ -247,6 +252,7 @@ struct efx_tx_queue { void __iomem *piobuf; unsigned int piobuf_offset; bool initialised; + bool timestamping; /* Function pointers used in the fast path. */ int (*handle_tso)(struct efx_tx_queue*, struct sk_buff*, bool *); @@ -257,6 +263,9 @@ struct efx_tx_queue { unsigned int merge_events; unsigned int bytes_compl; unsigned int pkts_compl; + unsigned int completed_desc_ptr; + u32 completed_timestamp_major; + u32 completed_timestamp_minor; /* Members used only on the xmit path */ unsigned int insert_count ____cacheline_aligned_in_smp; |