[RFC PATCH bpf-next 5/9] xsk: add busy-poll support for {recv,send}msg()

[Björn Töpel]

From: Björn Töpel <bjorn.to...@intel.com>

Wire-up XDP socket busy-poll support for recvmsg() and sendmsg().

Signed-off-by: Björn Töpel <bjorn.to...@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