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authorBjörn Töpel <bjorn.topel@intel.com>2020-11-30 19:52:00 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2020-12-01 00:09:25 +0100
commita0731952d9cddc9c11a8352922f449e6ab2f7537 (patch)
tree80e5e8b06dab104630cf0152b919ca9c08ba8d7f /net/xdp
parentxsk: Check need wakeup flag in sendmsg() (diff)
downloadlinux-a0731952d9cddc9c11a8352922f449e6ab2f7537.tar.xz
linux-a0731952d9cddc9c11a8352922f449e6ab2f7537.zip
xsk: Add busy-poll support for {recv,send}msg()
Wire-up XDP socket busy-poll support for recvmsg() and sendmsg(). If the XDP socket prefers busy-polling, make sure that no wakeup/IPI is performed. Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Magnus Karlsson <magnus.karlsson@intel.com> Link: https://lore.kernel.org/bpf/20201130185205.196029-6-bjorn.topel@gmail.com
Diffstat (limited to 'net/xdp')
-rw-r--r--net/xdp/xsk.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index c72b4dba2878..a8501a5477cf 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"
@@ -517,6 +518,17 @@ static int __xsk_sendmsg(struct sock *sk)
return xs->zc ? xsk_zc_xmit(xs) : xsk_generic_xmit(sk);
}
+static bool xsk_no_wakeup(struct sock *sk)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ /* Prefer busy-polling, skip the wakeup. */
+ return READ_ONCE(sk->sk_prefer_busy_poll) && READ_ONCE(sk->sk_ll_usec) &&
+ READ_ONCE(sk->sk_napi_id) >= MIN_NAPI_ID;
+#else
+ return false;
+#endif
+}
+
static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
{
bool need_wait = !(m->msg_flags & MSG_DONTWAIT);
@@ -529,6 +541,12 @@ 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 */
+
+ if (xsk_no_wakeup(sk))
+ return 0;
+
pool = xs->pool;
if (pool->cached_need_wakeup & XDP_WAKEUP_TX)
return __xsk_sendmsg(sk);
@@ -550,6 +568,12 @@ 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 (xsk_no_wakeup(sk))
+ return 0;
+
if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc)
return xsk_wakeup(xs, XDP_WAKEUP_RX);
return 0;