[dpdk-dev] [PATCH v2] net/sfc: add device state check to reta update operation

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Ivan Malov <ivan.malov@oktetlabs.ru>

The callback must not attempt to program RSS table to the HW
in non-started state; the new table must be remembered and
applied on the next start

Fixes: 32bcfb0a50b1 ("net/sfc: update RSS redirection table")
Cc: stable@dpdk.org

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@solarflare.com>
---
v2:
 - fix clang build failure because of possibly uninitialized rc

 drivers/net/sfc/sfc_ethdev.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index 9e65b6a..7a57472 100644
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -1354,7 +1354,7 @@ sfc_dev_rss_reta_update(struct rte_eth_dev *dev,
 	struct sfc_port *port = &sa->port;
 	unsigned int *rss_tbl_new;
 	uint16_t entry;
-	int rc;
+	int rc = 0;
 
 
 	if (port->isolated)
@@ -1399,11 +1399,16 @@ sfc_dev_rss_reta_update(struct rte_eth_dev *dev,
 		}
 	}
 
-	rc = efx_rx_scale_tbl_set(sa->nic, EFX_RSS_CONTEXT_DEFAULT,
-				  rss_tbl_new, EFX_RSS_TBL_SIZE);
-	if (rc == 0)
-		rte_memcpy(sa->rss_tbl, rss_tbl_new, sizeof(sa->rss_tbl));
+	if (sa->state == SFC_ADAPTER_STARTED) {
+		rc = efx_rx_scale_tbl_set(sa->nic, EFX_RSS_CONTEXT_DEFAULT,
+					  rss_tbl_new, EFX_RSS_TBL_SIZE);
+		if (rc != 0)
+			goto fail_scale_tbl_set;
+	}
+
+	rte_memcpy(sa->rss_tbl, rss_tbl_new, sizeof(sa->rss_tbl));
 
+fail_scale_tbl_set:
 bad_reta_entry:
 	sfc_adapter_unlock(sa);
 
-- 
2.7.4