From: Michal Sojka <sojkam1@fel.cvut.cz>
Date: Sun, 12 Jan 2014 23:17:52 +0000 (+0100)
Subject: Attempt to add busy_poll support for mmap RX
X-Git-Tag: fix-allnoconfig~90
X-Git-Url: http://rtime.felk.cvut.cz/gitweb/can-benchmark.git/commitdiff_plain/7aaa57c64c179eddf45a55e5dcd85764f4171566?ds=sidebyside

Attempt to add busy_poll support for mmap RX

This is not supported by PF_PACKET sockets so there is no change in
performance.
---

diff --git a/ugw/ugw.c b/ugw/ugw.c
index 9458e7d..482f4e1 100644
--- a/ugw/ugw.c
+++ b/ugw/ugw.c
@@ -137,6 +137,11 @@ void init_packet_rx(struct in_ctx *ctx)
 
 	s = CHECK(socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)));
 
+	if (busy_poll_us) {
+		CHECK(setsockopt(s, SOL_SOCKET, SO_BUSY_POLL,
+				 &busy_poll_us, sizeof(busy_poll_us)));
+	}
+
 	int val = TPACKET_V2;
 	CHECK(setsockopt(s, SOL_PACKET, PACKET_VERSION, &val, sizeof(val)));
 	socklen_t len = sizeof(ctx->hdrlen);