[Intel-wired-lan] [RFC PATCH bpf-next v2 5/9] xsk: add busy-poll support for {recv, send}msg()
Björn Töpel
bjorn.topel at gmail.com
Thu Nov 5 10:28:08 UTC 2020
From: Björn Töpel <bjorn.topel at intel.com>
Wire-up XDP socket busy-poll support for recvmsg() and sendmsg().
Signed-off-by: Björn Töpel <bjorn.topel at intel.com>
---
net/xdp/xsk.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 2e5b9f27c7a3..da649b4f377c 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -23,6 +23,7 @@
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <net/xdp_sock_drv.h>
+#include <net/busy_poll.h>
#include <net/xdp.h>
#include "xsk_queue.h"
@@ -472,6 +473,9 @@ static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
if (unlikely(need_wait))
return -EOPNOTSUPP;
+ if (sk_can_busy_loop(sk))
+ sk_busy_loop(sk, 1); /* only support non-blocking sockets */
+
pool = xs->pool;
if (pool->cached_need_wakeup & XDP_WAKEUP_TX)
return __xsk_sendmsg(sk);
@@ -493,6 +497,9 @@ static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int fl
if (unlikely(need_wait))
return -EOPNOTSUPP;
+ if (sk_can_busy_loop(sk))
+ sk_busy_loop(sk, 1); /* only support non-blocking sockets */
+
if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc)
return xsk_wakeup(xs, XDP_WAKEUP_RX);
return 0;
--
2.27.0
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