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Subject[RFC PATCH 23/24] vdpa_sim: filter destination mac address
Date
Add a simple unicast filter to filter out the dest MAC doesn't match
to the one stored in the config.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/vdpa/vdpa_sim/vdpa_sim.c | 49 ++++++++++++++++++++------------
1 file changed, 31 insertions(+), 18 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index b21670e054ba..66d901fb4c57 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -171,6 +171,22 @@ static void vdpasim_complete(struct vdpasim_virtqueue *vq, size_t len)
local_bh_enable();
}

+static bool receive_filter(struct vdpasim *vdpasim, size_t len)
+{
+ bool modern = vdpasim->features & (1ULL << VIRTIO_F_VERSION_1);
+ size_t hdr_len = modern ? sizeof(struct virtio_net_hdr_v1) :
+ sizeof(struct virtio_net_hdr);
+
+ if (len < ETH_ALEN + hdr_len)
+ return false;
+
+ if (!strncmp(vdpasim->buffer + hdr_len,
+ vdpasim->config.mac, ETH_ALEN))
+ return true;
+
+ return false;
+}
+
static void vdpasim_work(struct work_struct *work)
{
struct vdpasim *vdpasim = container_of(work, struct
@@ -178,7 +194,6 @@ static void vdpasim_work(struct work_struct *work)
struct vdpasim_virtqueue *txq = &vdpasim->vqs[1];
struct vdpasim_virtqueue *rxq = &vdpasim->vqs[0];
ssize_t read, write;
- size_t total_write;
int pkts = 0;
int err;

@@ -191,36 +206,34 @@ static void vdpasim_work(struct work_struct *work)
goto out;

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

+ read = vringh_iov_pull_iotlb(&txq->vring, &txq->riov,
+ vdpasim->buffer,
+ PAGE_SIZE);
+
+ if (!receive_filter(vdpasim, read)) {
+ vdpasim_complete(txq, 0);
+ continue;
+ }
+
err = vringh_getdesc_iotlb(&rxq->vring, NULL, &rxq->wiov,
&rxq->head, GFP_ATOMIC);
if (err <= 0) {
- vringh_complete_iotlb(&txq->vring, txq->head, 0);
+ vdpasim_complete(txq, 0);
break;
}

- while (true) {
- 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->wiov,
- vdpasim->buffer, read);
- if (write <= 0)
- break;
-
- total_write += write;
- }
+ write = vringh_iov_push_iotlb(&rxq->vring, &rxq->wiov,
+ vdpasim->buffer, read);
+ if (write <= 0)
+ break;

vdpasim_complete(txq, 0);
- vdpasim_complete(rxq, total_write);
+ vdpasim_complete(rxq, write);

if (++pkts > 4) {
schedule_work(&vdpasim->work);
--
2.20.1
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