[PATCH RFC 10/12] vdpa_sim: split vdpasim_virtqueue's iov field in riov and wiov

Stefano Garzarella
2020-11-13T13:48:52Z

vringh_getdesc_iotlb() manages 2 iovs for writable and readable
descriptors. This is very useful for the block device, where for
each request we have both types of descriptor.

Let's split the vdpasim_virtqueue's iov field in riov and wiov
to use them with vringh_getdesc_iotlb().

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
drivers/vdpa/vdpa_sim/vdpa_sim.h | 3 ++-
drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 6 +++---
drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 8 ++++----
3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
index cc21e07aa2f7..0d4629675e4b 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
@@ -27,7 +27,8 @@ struct vdpasim;

struct vdpasim_virtqueue {
struct vringh vring;
- struct vringh_kiov iov;
+ struct vringh_kiov riov;
+ struct vringh_kiov wiov;
unsigned short head;
bool ready;
u64 desc_addr;
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
index 122a3c039507..8e41b3ab98d5 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -41,13 +41,13 @@ static void vdpasim_blk_work(struct work_struct *work)
if (!vq->ready)
continue;

- while (vringh_getdesc_iotlb(&vq->vring, &vq->iov, &vq->iov,
+ while (vringh_getdesc_iotlb(&vq->vring, &vq->riov, &vq->wiov,
&vq->head, GFP_ATOMIC) > 0) {

int write;

- vq->iov.i = vq->iov.used - 1;
- write = vringh_iov_push_iotlb(&vq->vring, &vq->iov, &status, 1);
+ vq->wiov.i = vq->wiov.used - 1;
+ write = vringh_iov_push_iotlb(&vq->vring, &vq->wiov, &status, 1);
if (write <= 0)
break;

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
index d0a1403f64b2..783b1e85b09c 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
@@ -47,12 +47,12 @@ static void vdpasim_net_work(struct work_struct *work)

while (true) {
total_write = 0;
- err = vringh_getdesc_iotlb(&txq->vring, &txq->iov, NULL,
+ err = vringh_getdesc_iotlb(&txq->vring, &txq->riov, NULL,
&txq->head, GFP_ATOMIC);
if (err <= 0)
break;

- err = vringh_getdesc_iotlb(&rxq->vring, NULL, &rxq->iov,
+ err = vringh_getdesc_iotlb(&rxq->vring, NULL, &rxq->wiov,
&rxq->head, GFP_ATOMIC);
if (err <= 0) {
vringh_complete_iotlb(&txq->vring, txq->head, 0);
@@ -60,13 +60,13 @@ static void vdpasim_net_work(struct work_struct *work)
}

while (true) {
- read = vringh_iov_pull_iotlb(&txq->vring, &txq->iov,
+ read = vringh_iov_pull_iotlb(&txq->vring, &txq->riov,
vdpasim->buffer,
PAGE_SIZE);
if (read <= 0)
break;

- write = vringh_iov_push_iotlb(&rxq->vring, &rxq->iov,
+ write = vringh_iov_push_iotlb(&rxq->vring, &rxq->wiov,
vdpasim->buffer, read);
if (write <= 0)
break;
--
2.26.2