diff options
| author | Michal Schmidt <mschmidt@redhat.com> | 2024-09-30 22:13:07 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-10-04 09:25:15 -0700 |
| commit | 2efeaf1d2a13f4b7419d60cd145ac84a3c151214 (patch) | |
| tree | 4dee535f7d2fb7e15519285e11a0326a98337866 /drivers/net/ethernet/qlogic | |
| parent | cf54ae6b59203bea4f4c749043fa57a58d279e38 (diff) | |
qed: put cond_resched() in qed_dmae_operation_wait()
It is OK to sleep in qed_dmae_operation_wait, because it is called only
in process context, while holding p_hwfn->dmae_info.mutex from one of
the qed_dmae_{host,grc}2{host,grc} functions.
The udelay(DMAE_MIN_WAIT_TIME=2) in the function is too short to replace
with usleep_range, but at least it's a suitable point for checking if we
should give up the CPU with cond_resched().
This lowers the latency caused by 'ethtool -d' from 10 ms to less than
2 ms on my test system with voluntary preemption.
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Link: https://patch.msgid.link/20240930201307.330692-5-mschmidt@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/qlogic')
| -rw-r--r-- | drivers/net/ethernet/qlogic/qed/qed_hw.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qlogic/qed/qed_hw.c b/drivers/net/ethernet/qlogic/qed/qed_hw.c index 6263f847b6b9..9e5f0dbc8a07 100644 --- a/drivers/net/ethernet/qlogic/qed/qed_hw.c +++ b/drivers/net/ethernet/qlogic/qed/qed_hw.c @@ -596,6 +596,7 @@ static int qed_dmae_operation_wait(struct qed_hwfn *p_hwfn) barrier(); while (*p_hwfn->dmae_info.p_completion_word != DMAE_COMPLETION_VAL) { udelay(DMAE_MIN_WAIT_TIME); + cond_resched(); if (++wait_cnt > wait_cnt_limit) { DP_NOTICE(p_hwfn->cdev, "Timed-out waiting for operation to complete. Completion word is 0x%08x expected 0x%08x.\n", |