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/tx.c | |
| 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/tx.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/tx.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c index 9937a2450e57..f86a0a900f2f 100644 --- a/drivers/net/ethernet/sfc/tx.c +++ b/drivers/net/ethernet/sfc/tx.c @@ -77,9 +77,23 @@ static void efx_dequeue_buffer(struct efx_tx_queue *tx_queue, } if (buffer->flags & EFX_TX_BUF_SKB) { + struct sk_buff *skb = (struct sk_buff *)buffer->skb; + EFX_WARN_ON_PARANOID(!pkts_compl || !bytes_compl); (*pkts_compl)++; - (*bytes_compl) += buffer->skb->len; + (*bytes_compl) += skb->len; + if (tx_queue->timestamping && + (tx_queue->completed_timestamp_major || + tx_queue->completed_timestamp_minor)) { + struct skb_shared_hwtstamps hwtstamp; + + hwtstamp.hwtstamp = + efx_ptp_nic_to_kernel_time(tx_queue); + skb_tstamp_tx(skb, &hwtstamp); + + tx_queue->completed_timestamp_major = 0; + tx_queue->completed_timestamp_minor = 0; + } dev_consume_skb_any((struct sk_buff *)buffer->skb); netif_vdbg(tx_queue->efx, tx_done, tx_queue->efx->net_dev, "TX queue %d transmission id %x complete\n", @@ -828,6 +842,10 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue) tx_queue->old_read_count = 0; tx_queue->empty_read_count = 0 | EFX_EMPTY_COUNT_VALID; tx_queue->xmit_more_available = false; + tx_queue->timestamping = false; + tx_queue->completed_desc_ptr = tx_queue->ptr_mask; + tx_queue->completed_timestamp_major = 0; + tx_queue->completed_timestamp_minor = 0; /* Set up default function pointers. These may get replaced by * efx_nic_init_tx() based off NIC/queue capabilities. |