Commit 14c9ac05 authored by Stefano Garzarella's avatar Stefano Garzarella Committed by Michael S. Tsirkin
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vringh: add vringh_kiov_length() helper 



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

Suggested-by: default avatarJason Wang <jasowang@redhat.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210315163450.254396-7-sgarzare@redhat.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent b8c06ad4

include/linux/vringh.h

+11 −0
Original line number Diff line number Diff line
@@ -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,