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vringh: add vringh_kiov_length() helper

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This new helper returns the total number of bytes covered by
a vringh_kiov.

Suggested-by: Jason Wang <jasowang@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210315163450.254396-7-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefano Garzarella 2021-03-15 17:34:42 +01:00 committed by Michael S. Tsirkin
parent b8c06ad4d6
commit 14c9ac05ce
1 changed files with 11 additions and 0 deletions
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11
include/linux/vringh.h
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@ -199,6 +199,17 @@ static inline void vringh_kiov_cleanup(struct vringh_kiov *kiov)
kiov->iov = NULL;
}
static inline size_t vringh_kiov_length(struct vringh_kiov *kiov)
{
size_t len = 0;
int i;
for (i = kiov->i; i < kiov->used; i++)
len += kiov->iov[i].iov_len;
return len;
}
void vringh_kiov_advance(struct vringh_kiov *kiov, size_t len);
int vringh_getdesc_kern(struct vringh *vrh,