diff options
| author |   Benoît Ganne <bganne@cisco.com> | 2021-04-29 18:24:24 +0200 |
|---|---|---|
| committer |   Damjan Marion <dmarion@me.com> | 2021-05-21 19:50:14 +0000 |
| commit | a42c41be4eed3e1ce2a42038b07ce1d3420891cd (patch) | |
| tree | fc95c7c24cbef993cc2bef8742b3360123d70b66 /src/plugins/af_xdp/test_api.c | |
| parent | 92a8d761c412590f5112239be4c511091b2b2d5a (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.c | 2 |
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); |