hv_netvsc: Fix XDP refcnt for synthetic and VF NICs

The caller of XDP_SETUP_PROG has already incremented refcnt in
__bpf_prog_get(), so drivers should only increment refcnt by
num_queues - 1.

To fix the issue, update netvsc_xdp_set() to add the correct number
to refcnt.

Hold a refcnt in netvsc_xdp_set()’s other caller, netvsc_attach().

And, do the same in netvsc_vf_setxdp(). Otherwise, every time when VF is
removed and added from the host side, the refcnt will be decreased by one,
which may cause page fault when unloading xdp program.

Fixes: 351e1581395f ("hv_netvsc: Add XDP support")
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/hyperv/netvsc_bpf.c b/drivers/net/hyperv/netvsc_bpf.c
index 20adfe5..b866110 100644 (file)
--- a/drivers/net/hyperv/netvsc_bpf.c
+++ b/drivers/net/hyperv/netvsc_bpf.c
@@ -120,7 +120,7 @@ int netvsc_xdp_set(struct net_device *dev, struct bpf_prog *prog,
        }
 
        if (prog)
-               bpf_prog_add(prog, nvdev->num_chn);
+               bpf_prog_add(prog, nvdev->num_chn - 1);
 
        for (i = 0; i < nvdev->num_chn; i++)
                rcu_assign_pointer(nvdev->chan_table[i].bpf_prog, prog);
@@ -136,6 +136,7 @@ int netvsc_vf_setxdp(struct net_device *vf_netdev, struct bpf_prog *prog)
 {
        struct netdev_bpf xdp;
        bpf_op_t ndo_bpf;
+       int ret;
 
        ASSERT_RTNL();
 
@@ -148,10 +149,18 @@ int netvsc_vf_setxdp(struct net_device *vf_netdev, struct bpf_prog *prog)
 
        memset(&xdp, 0, sizeof(xdp));
 
+       if (prog)
+               bpf_prog_inc(prog);
+
        xdp.command = XDP_SETUP_PROG;
        xdp.prog = prog;
 
-       return ndo_bpf(vf_netdev, &xdp);
+       ret = ndo_bpf(vf_netdev, &xdp);
+
+       if (ret && prog)
+               bpf_prog_put(prog);
+
+       return ret;
 }
 
 static u32 netvsc_xdp_query(struct netvsc_device *nvdev)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 8fc71bd..65e12cb 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1059,9 +1059,12 @@ static int netvsc_attach(struct net_device *ndev,
 
        prog = dev_info->bprog;
        if (prog) {
+               bpf_prog_inc(prog);
                ret = netvsc_xdp_set(ndev, prog, NULL, nvdev);
-               if (ret)
+               if (ret) {
+                       bpf_prog_put(prog);
                        goto err1;
+               }
        }
 
        /* In any case device is now ready */