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authorJesper Dangaard Brouer <brouer@redhat.com>2018-01-03 11:25:59 +0100
committerAlexei Starovoitov <ast@kernel.org>2018-01-05 15:21:22 -0800
commit8bf5c4ee1889308ccd396fdfd40ac94129ee419f (patch)
treef5ebb48e1047c44b97e6d650775699d019bd1324 /drivers/net/tun.c
parent27e95e3648910c81a0840aa10dde77323795519e (diff)
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tun: setup xdp_rxq_info
Driver hook points for xdp_rxq_info: * reg : tun_attach * unreg: __tun_detach I've done some manual testing of this tun driver, but I would appriciate good review and someone else running their use-case tests, as I'm not 100% sure I understand the tfile->detached semantics. V2: Removed the skb_array_cleanup() call from V1 by request from Jason Wang. Cc: Jason Wang <jasowang@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Willem de Bruijn <willemb@google.com> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e367d6310353..e7c5f4b2a9a6 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -180,6 +180,7 @@ struct tun_file {
struct list_head next;
struct tun_struct *detached;
struct skb_array tx_array;
+ struct xdp_rxq_info xdp_rxq;
};
struct tun_flow_entry {
@@ -687,8 +688,10 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
tun->dev->reg_state == NETREG_REGISTERED)
unregister_netdevice(tun->dev);
}
- if (tun)
+ if (tun) {
skb_array_cleanup(&tfile->tx_array);
+ xdp_rxq_info_unreg(&tfile->xdp_rxq);
+ }
sock_put(&tfile->sk);
}
}
@@ -728,11 +731,13 @@ static void tun_detach_all(struct net_device *dev)
tun_napi_del(tun, tfile);
/* Drop read queue */
tun_queue_purge(tfile);
+ xdp_rxq_info_unreg(&tfile->xdp_rxq);
sock_put(&tfile->sk);
}
list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) {
tun_enable_queue(tfile);
tun_queue_purge(tfile);
+ xdp_rxq_info_unreg(&tfile->xdp_rxq);
sock_put(&tfile->sk);
}
BUG_ON(tun->numdisabled != 0);
@@ -784,6 +789,22 @@ static int tun_attach(struct tun_struct *tun, struct file *file,
tfile->queue_index = tun->numqueues;
tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN;
+
+ if (tfile->detached) {
+ /* Re-attach detached tfile, updating XDP queue_index */
+ WARN_ON(!xdp_rxq_info_is_reg(&tfile->xdp_rxq));
+
+ if (tfile->xdp_rxq.queue_index != tfile->queue_index)
+ tfile->xdp_rxq.queue_index = tfile->queue_index;
+ } else {
+ /* Setup XDP RX-queue info, for new tfile getting attached */
+ err = xdp_rxq_info_reg(&tfile->xdp_rxq,
+ tun->dev, tfile->queue_index);
+ if (err < 0)
+ goto out;
+ err = 0;
+ }
+
rcu_assign_pointer(tfile->tun, tun);
rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile);
tun->numqueues++;
@@ -1508,6 +1529,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
xdp.data = buf + pad;
xdp_set_data_meta_invalid(&xdp);
xdp.data_end = xdp.data + len;
+ xdp.rxq = &tfile->xdp_rxq;
orig_data = xdp.data;
act = bpf_prog_run_xdp(xdp_prog, &xdp);