From 4e4c8c7a1cca2125e2bf2a67cbab0bdbd78fdb86 Mon Sep 17 00:00:00 2001
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From: He Zhe <zhe.he@windriver.com>
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Date: Tue, 30 Jul 2019 13:24:22 +0800
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Subject: [PATCH] ptts: Set recv buffer size too max to receive as many
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packets as possible
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Flooding multicast may make the rcv buffer overrun and is considered
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premature messages later and thus cause the following error.
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"Ignoring premature msg 16, currently handling 12"
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This patch sets SO_RCVBUF the of socket to max int value to receive as many
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packets as possible, and give a hint to user when possible overrun occurs. Note
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that the value of SO_RCVBUF will be limited up to min(INT_MAX/2,
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sysctl_rmem_max) in kernel.
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Signed-off-by: He Zhe <zhe.he@windriver.com>
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Upstream-Status: Backport
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Signed-off-by: Li Zhou <li.zhou@windriver.com>
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---
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ptts/tipc_ts_server.c | 18 ++++++++++++++++--
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1 file changed, 16 insertions(+), 2 deletions(-)
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diff --git a/ptts/tipc_ts_server.c b/ptts/tipc_ts_server.c
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index a286daa..3a2f96f 100644
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--- a/ptts/tipc_ts_server.c
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+++ b/ptts/tipc_ts_server.c
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@@ -641,8 +641,9 @@ void server_mcast
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if (rc < 0)
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err("multicast message not received");
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if (msgno != *(int*) buf) {
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- dbg1("Ignoring premature msg %u, currently handling %u\n",
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- *(int*)buf, msgno);
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+ dbg1("Ignoring premature msg %u, currently handling %u\n"
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+ "You can enlarge /proc/sys/net/core/rmem_max and try again\n",
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+ *(int*)buf, msgno);
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continue;
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}
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rc = recvfrom(sd[i], buf, expected_szs[numSubTest],
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@@ -687,8 +688,21 @@ void server_test_multicast(void)
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FD_ZERO(&readfds);
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for (i = 0; i < TIPC_MCAST_SOCKETS; i++) {
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+ int optval = (int)(~0U >> 1);
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+ socklen_t optlen = sizeof(optval);
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+ int rc = 0;
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+
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sd[i] = createSocketTIPC (SOCK_RDM);
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FD_SET(sd[i], &readfds);
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+
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+ /*
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+ * Flooding multicast may make the rcv buffer overrun and considered premature msg later.
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+ * Set SO_RCVBUF to max int value to receive as many packets as possible.
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+ * Note that it will be limited up to min(INT_MAX/2, sysctl_rmem_max) in kernel.
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+ */
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+ rc = setsockopt(sd[i], SOL_SOCKET, SO_RCVBUF, (const char*)&optval, optlen);
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+ if(rc != 0)
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+ printf("Failed to set SO_RCVBUF of %d: %s\n", sd[i], strerror(errno));
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}
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server_bindMulticast( 0, 99, sd[0]);
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--
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2.17.1
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