[PATCH v2] net/af_xdp: allow operation when multiprocess is disabled

[Junxiao Shi <git@mail1.yoursunny.com>]

If EAL multiprocess feature has been disabled via rte_mp_disable()
function, AF_XDP driver may not be able to register its IPC callback.
Previously this leads to probe failure.
This commit adds a check for this condition so that AF_XDP can still be
used even if multiprocess is disabled.

Fixes: 9876cf8316b3 ("net/af_xdp: re-enable secondary process support")

Signed-off-by: Junxiao Shi <git@mail1.yoursunny.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 6ac710c6bd..2163df7c5c 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -1995,7 +1995,7 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device *dev)
 	/* Register IPC callback which shares xsk fds from primary to secondary */
 	if (!afxdp_dev_count) {
 		ret = rte_mp_action_register(ETH_AF_XDP_MP_KEY, afxdp_mp_send_fds);
-		if (ret < 0) {
+		if (ret < 0 && rte_errno != ENOTSUP) {
 			AF_XDP_LOG(ERR, "%s: Failed to register multi-process IPC callback: %s",
 				   name, strerror(rte_errno));
 			return -1;
-- 
2.17.1