[dpdk-stable] [PATCH v2] net/af_xdp: disable secondary process support

[Ciara Loftus]

Since the AF_XDP PMD does not work for secondary processes as reported
in Bugzilla 805, check for the process type at the beginning of probe
and return ENOTSUP if the process type is secondary.

It is planned that secondary processes will be supported by the PMD in
full in a future release by using rte_mp_msg to pass the state to the
secondary process that it requires in order to work.

Bugzilla ID: 805
Fixes: f1debd77efaf ("net/af_xdp: introduce AF_XDP PMD")
Cc: stable at dpdk.org

Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
Reported-by: Stephen Hemminger <stephen at networkplumber.org>
---
 doc/guides/rel_notes/release_21_11.rst |  4 ++++
 drivers/net/af_xdp/rte_eth_af_xdp.c    | 15 +++++----------
 2 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
index efeffe37a0..f30299ae7e 100644
--- a/doc/guides/rel_notes/release_21_11.rst
+++ b/doc/guides/rel_notes/release_21_11.rst
@@ -67,6 +67,10 @@ New Features
   Added macros ETH_RSS_IPV4_CHKSUM and ETH_RSS_L4_CHKSUM, now IPv4 and
   TCP/UDP/SCTP header checksum field can be used as input set for RSS.
 
+* **Updated AF_XDP PMD.**
+
+  * Disabled secondary process support.
+
 * **Updated Broadcom bnxt PMD.**
 
   * Added flow offload support for Thor.
diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 9bea0a895a..d61cb0aa7c 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -1790,16 +1790,11 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device *dev)
 		rte_vdev_device_name(dev));
 
 	name = rte_vdev_device_name(dev);
-	if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
-		strlen(rte_vdev_device_args(dev)) == 0) {
-		eth_dev = rte_eth_dev_attach_secondary(name);
-		if (eth_dev == NULL) {
-			AF_XDP_LOG(ERR, "Failed to probe %s\n", name);
-			return -EINVAL;
-		}
-		eth_dev->dev_ops = &ops;
-		rte_eth_dev_probing_finish(eth_dev);
-		return 0;
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
+		AF_XDP_LOG(ERR, "Failed to probe %s. "
+				"AF_XDP PMD does not support secondary processes.\n",
+				name);
+		return -ENOTSUP;
 	}
 
 	kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_arguments);
-- 
2.17.1