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sfc: add and use efx_tx_send_pending in tx.c

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Instead of using efx_tx_queue_partner(), which relies on the assumption
 that tx_queues_per_channel is 2, efx_tx_send_pending() iterates over
 txqs with efx_for_each_channel_tx_queue().
We unconditionally set tx_queue->xmit_pending (renamed from
 xmit_more_available), then condition on xmit_more for the call to
 efx_tx_send_pending(), which will clear xmit_pending.  Thus, after an
 xmit_more TX, the doorbell is un-rung and xmit_pending is true.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Edward Cree
2020-09-03 22:34:15 +01:00
committed by Jakub Kicinski
parent 44a8c4f33c
commit 1c0544d249
6 changed files with 44 additions and 41 deletions
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4
drivers/net/ethernet/sfc/net_driver.h
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@@ -244,7 +244,7 @@ struct efx_tx_buffer {
* @tso_fallbacks: Number of times TSO fallback used
* @pushes: Number of times the TX push feature has been used
* @pio_packets: Number of times the TX PIO feature has been used
* @xmit_more_available: Are any packets waiting to be pushed to the NIC
* @xmit_pending: Are any packets waiting to be pushed to the NIC
* @cb_packets: Number of times the TX copybreak feature has been used
* @notify_count: Count of notified descriptors to the NIC
* @empty_read_count: If the completion path has seen the queue as empty
@@ -292,7 +292,7 @@ struct efx_tx_queue {
unsigned int tso_fallbacks;
unsigned int pushes;
unsigned int pio_packets;
bool xmit_more_available;
bool xmit_pending;
unsigned int cb_packets;
unsigned int notify_count;
/* Statistics to supplement MAC stats */