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| author | Branden Bonaby <brandonbonaby94@gmail.com> | 2019-10-03 23:01:49 +0200 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2019-11-22 02:10:44 +0100 |
| commit | af9ca6f9bb16e446a44393a797d0ae74d356a5c7 (patch) | |
| tree | 680048b102f151af1f8cec990e374ff0721c2284 /drivers/hv/ring_buffer.c | |
| parent | video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame buffer driver (diff) | |
| download | linux-af9ca6f9bb16e446a44393a797d0ae74d356a5c7.tar.xz linux-af9ca6f9bb16e446a44393a797d0ae74d356a5c7.zip | |
drivers: hv: vmbus: Introduce latency testing
Introduce user specified latency in the packet reception path
By exposing the test parameters as part of the debugfs channel
attributes. We will control the testing state via these attributes.
Signed-off-by: Branden Bonaby <brandonbonaby94@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hv/ring_buffer.c')
| -rw-r--r-- | drivers/hv/ring_buffer.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index 9a03b163cbbd..356e22159e83 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -396,6 +396,7 @@ struct vmpacket_descriptor *hv_pkt_iter_first(struct vmbus_channel *channel) struct hv_ring_buffer_info *rbi = &channel->inbound; struct vmpacket_descriptor *desc; + hv_debug_delay_test(channel, MESSAGE_DELAY); if (hv_pkt_iter_avail(rbi) < sizeof(struct vmpacket_descriptor)) return NULL; @@ -421,6 +422,7 @@ __hv_pkt_iter_next(struct vmbus_channel *channel, u32 packetlen = desc->len8 << 3; u32 dsize = rbi->ring_datasize; + hv_debug_delay_test(channel, MESSAGE_DELAY); /* bump offset to next potential packet */ rbi->priv_read_index += packetlen + VMBUS_PKT_TRAILER; if (rbi->priv_read_index >= dsize) |