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| author | Michael S. Tsirkin <mst@redhat.com> | 2012-11-01 09:16:42 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-11-02 21:29:57 -0400 |
| commit | c4fcb586c337f8b8de3a3d7ba8514eed03695f6e (patch) | |
| tree | ba018d4de83d2e4a9898e06e9f813359a56d85fd /drivers/vhost/vhost.h | |
| parent | 70e4cb9aafb3caa9e5eb25614a5bc40b0ffa9ffd (diff) | |
| download | linux-c4fcb586c337f8b8de3a3d7ba8514eed03695f6e.tar.bz2 | |
vhost: track zero copy failures using DMA length
This will be used to disable zerocopy when error rate
is high.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/vhost/vhost.h')
| -rw-r--r-- | drivers/vhost/vhost.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index b6538eef7468..464469d901d5 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -17,6 +17,8 @@ * For transmit, used buffer len is unused; we override it to track buffer * status internally; used for zerocopy tx only. */ +/* Lower device DMA failed */ +#define VHOST_DMA_FAILED_LEN 3 /* Lower device DMA done */ #define VHOST_DMA_DONE_LEN 2 /* Lower device DMA in progress */ @@ -24,6 +26,8 @@ /* Buffer unused */ #define VHOST_DMA_CLEAR_LEN 0 +#define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN) + struct vhost_device; struct vhost_work; |