[PATCH net-next] tuntap: XDP_TX can use native XDP
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STALE3140d
From: Jason Wang <hidden>
Date: 2018-03-14 03:23:46
Also in:
lkml
Subsystem:
networking drivers, the rest, tun/tap driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Willem de Bruijn, Jason Wang
Now we have ndo_xdp_xmit, switch to use it instead of the slow generic XDP TX routine. XDP_TX on TAP gets ~20% improvements from ~1.5Mpps to ~1.8Mpps on 2.60GHz Core(TM) i7-5600U. Signed-off-by: Jason Wang <redacted> --- drivers/net/tun.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 475088f..baeafa0 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c@@ -1613,7 +1613,6 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, unsigned int delta = 0; char *buf; size_t copied; - bool xdp_xmit = false; int err, pad = TUN_RX_PAD; rcu_read_lock();
@@ -1671,8 +1670,14 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, preempt_enable(); return NULL; case XDP_TX: - xdp_xmit = true; - /* fall through */ + get_page(alloc_frag->page); + alloc_frag->offset += buflen; + if (tun_xdp_xmit(tun->dev, &xdp)) + goto err_redirect; + tun_xdp_flush(tun->dev); + rcu_read_unlock(); + preempt_enable(); + return NULL; case XDP_PASS: delta = orig_data - xdp.data; break;
@@ -1699,14 +1704,6 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, get_page(alloc_frag->page); alloc_frag->offset += buflen; - if (xdp_xmit) { - skb->dev = tun->dev; - generic_xdp_tx(skb, xdp_prog); - rcu_read_unlock(); - preempt_enable(); - return NULL; - } - rcu_read_unlock(); preempt_enable();
--
2.7.4