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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/test_api.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/test_api.c')
-rw-r--r--src/plugins/af_xdp/test_api.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/plugins/af_xdp/test_api.c b/src/plugins/af_xdp/test_api.c
index 270db4e2973..6dffa29bdd1 100644
--- a/src/plugins/af_xdp/test_api.c
+++ b/src/plugins/af_xdp/test_api.c
@@ -81,6 +81,8 @@ api_af_xdp_create (vat_main_t * vam)
mp->rxq_size = clib_host_to_net_u16 (args.rxq_size);
mp->txq_size = clib_host_to_net_u16 (args.txq_size);
mp->mode = api_af_xdp_mode (args.mode);
+ if (args.flags & AF_XDP_CREATE_FLAGS_NO_SYSCALL_LOCK)
+ mp->flags |= AF_XDP_API_FLAGS_NO_SYSCALL_LOCK;
snprintf ((char *) mp->prog, sizeof (mp->prog), "%s", args.prog ? : "");
S (mp);