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authorBenoît Ganne <bganne@cisco.com>2021-04-29 18:24:24 +0200
committerDamjan Marion <dmarion@me.com>2021-05-21 19:50:14 +0000
commita42c41be4eed3e1ce2a42038b07ce1d3420891cd (patch)
treefc95c7c24cbef993cc2bef8742b3360123d70b66 /src/plugins/af_xdp/cli.c
parent92a8d761c412590f5112239be4c511091b2b2d5a (diff)
af_xdp: workaround kernel race between poll() and sendmsg()
Prior to Linux 5.6 there is a race condition between poll() and sendmsg() in the kernel. This patch protects the syscalls with a lock to prevent it, unless the NO_SYSCALL_LOCK flag is set at create time. See https://lore.kernel.org/bpf/BYAPR11MB365382C5DB1E5FCC53242609C1549@BYAPR11MB3653.namprd11.prod.outlook.com/ Type: fix Change-Id: Ie7d4f5cb41f697b11a09b6046e54d190430d76df Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src/plugins/af_xdp/cli.c')
-rw-r--r--src/plugins/af_xdp/cli.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/plugins/af_xdp/cli.c b/src/plugins/af_xdp/cli.c
index d5f21d4c391..2f3deffaaee 100644
--- a/src/plugins/af_xdp/cli.c
+++ b/src/plugins/af_xdp/cli.c
@@ -47,7 +47,10 @@ af_xdp_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (af_xdp_create_command, static) = {
.path = "create interface af_xdp",
- .short_help = "create interface af_xdp <host-if linux-ifname> [name ifname] [rx-queue-size size] [tx-queue-size size] [num-rx-queues <num|all>] [prog pathname] [zero-copy|no-zero-copy]",
+ .short_help =
+ "create interface af_xdp <host-if linux-ifname> [name ifname] "
+ "[rx-queue-size size] [tx-queue-size size] [num-rx-queues <num|all>] "
+ "[prog pathname] [zero-copy|no-zero-copy] [no-syscall-lock]",
.function = af_xdp_create_command_fn,
};
/* *INDENT-ON* */