net/bnxt: fix queue stop operation

[ upstream commit 3e6fae2 ]

When there are no active Rx queues(i.e when all queues have been
stopped), clear the RSS redirection table of the VNIC on Thor.

Fixes: 9b63c6f ("net/bnxt: support Rx/Tx queue start/stop")

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>

drivers/net/bnxt/bnxt_hwrm.c

@@ -5961,3 +5961,26 @@ int bnxt_hwrm_poll_ver_get(struct bnxt *bp)
 
 	return rc;
 }
+
+int
+bnxt_vnic_rss_clear_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic)
+{
+	struct hwrm_vnic_rss_cfg_output *resp = bp->hwrm_cmd_resp_addr;
+	struct hwrm_vnic_rss_cfg_input req = {0};
+	int nr_ctxs = vnic->num_lb_ctxts;
+	int i, rc = 0;
+
+	for (i = 0; i < nr_ctxs; i++) {
+		HWRM_PREP(&req, HWRM_VNIC_RSS_CFG, BNXT_USE_CHIMP_MB);
+
+		req.rss_ctx_idx = rte_cpu_to_le_16(vnic->fw_grp_ids[i]);
+		req.vnic_id = rte_cpu_to_le_16(vnic->fw_vnic_id);
+
+		rc = bnxt_hwrm_send_message(bp, &req, sizeof(req), BNXT_USE_CHIMP_MB);
+
+		HWRM_CHECK_RESULT();
+		HWRM_UNLOCK();
+	}
+
+	return rc;
+}

drivers/net/bnxt/bnxt_hwrm.h

@@ -297,4 +297,5 @@ int bnxt_hwrm_poll_ver_get(struct bnxt *bp);
 int bnxt_hwrm_ring_stats(struct bnxt *bp, uint32_t cid, int idx,
 			 struct bnxt_ring_stats *stats, bool rx);
 int bnxt_hwrm_rx_ring_reset(struct bnxt *bp, int queue_index);
+int bnxt_vnic_rss_clear_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 #endif

drivers/net/bnxt/bnxt_rxq.c

@@ -546,6 +546,9 @@ int bnxt_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 		if (active_queue_cnt == 0) {
 			uint16_t saved_mru = vnic->mru;
 
+			/* clear RSS setting on vnic. */
+			bnxt_vnic_rss_clear_p5(bp, vnic);
+
 			vnic->mru = 0;
 			/* Reconfigure default receive ring and MRU. */
 			bnxt_hwrm_vnic_cfg(bp, vnic);