diff options
Diffstat (limited to 'drivers/net/sfc/tx.c')
| -rw-r--r-- | drivers/net/sfc/tx.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/net/sfc/tx.c b/drivers/net/sfc/tx.c index fef22351ddbd..bdb92b4af683 100644 --- a/drivers/net/sfc/tx.c +++ b/drivers/net/sfc/tx.c @@ -428,6 +428,16 @@ void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index) __netif_tx_unlock(queue); } } + + /* Check whether the hardware queue is now empty */ + if ((int)(tx_queue->read_count - tx_queue->old_write_count) >= 0) { + tx_queue->old_write_count = ACCESS_ONCE(tx_queue->write_count); + if (tx_queue->read_count == tx_queue->old_write_count) { + smp_mb(); + tx_queue->empty_read_count = + tx_queue->read_count | EFX_EMPTY_COUNT_VALID; + } + } } int efx_probe_tx_queue(struct efx_tx_queue *tx_queue) @@ -473,8 +483,10 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue) tx_queue->insert_count = 0; tx_queue->write_count = 0; + tx_queue->old_write_count = 0; tx_queue->read_count = 0; tx_queue->old_read_count = 0; + tx_queue->empty_read_count = 0 | EFX_EMPTY_COUNT_VALID; BUG_ON(tx_queue->stopped); /* Set up TX descriptor ring */ |