[PATCH 05/17] net/bnxt: fix support for tunnel stateless offloads

[Kalesh A P]

From: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>

The HW only supports tunnel header parsing globally for supported tunnel
types. When a function uses one default VNIC to receive both the tunnel
and non-tunnel packets, applying the same stateless offload operation to
both tunnel and non-tunnel packets can cause problems in certain scenarios.
To workaround these problems, the firmware advertises no tunnel header
parsing capabilities to the driver using the HWRM_FUNC_QCAPS.
The driver must check this flag setting and accordingly not advertise
tunnel packet stateless offload capabilities to the stack.

If the device supports VXLAN, GRE, IPIP and GENEVE tunnel parsing,
then reports RX_OFFLOAD_OUTER_IPV4_CKSUM, RX_OFFLOAD_OUTER_UDP_CKSUM
and TX_OFFLOAD_OUTER_IPV4_CKSUM in the Rx/Tx offload capabilities of
the device.
Also, advertise tunnel TSO capabilities based on FW support.

Fixes: 0a6d2a720078 ("net/bnxt: get device infos")
Cc: stable at dpdk.org

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur at broadcom.com>
---
 drivers/net/bnxt/bnxt.h      |  1 +
 drivers/net/bnxt/bnxt_hwrm.c |  5 +++++
 drivers/net/bnxt/bnxt_hwrm.h | 20 ++++++++++++++++++++
 drivers/net/bnxt/bnxt_rxq.c  |  7 ++++---
 drivers/net/bnxt/bnxt_txq.c  | 18 ++++++++++++------
 5 files changed, 42 insertions(+), 9 deletions(-)

diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
index 9e5ff74..e4e8e8e 100644
--- a/drivers/net/bnxt/bnxt.h
+++ b/drivers/net/bnxt/bnxt.h
@@ -871,6 +871,7 @@ struct bnxt {
 	uint32_t		max_mcast_addr; /* maximum number of mcast filters supported */
 
 	struct rte_eth_rss_conf	rss_conf; /* RSS configuration. */
+	uint16_t		tunnel_disable_flag; /* tunnel stateless offloads status */
 };
 
 static
diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index bff73a9..178a112 100644
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -939,6 +939,11 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->fw_cap |= BNXT_FW_CAP_VLAN_TX_INSERT;
 		PMD_DRV_LOG(DEBUG, "VLAN acceleration for TX is enabled\n");
 	}
+
+	bp->tunnel_disable_flag = rte_le_to_cpu_16(resp->tunnel_disable_flag);
+	if (bp->tunnel_disable_flag)
+		PMD_DRV_LOG(DEBUG, "Tunnel parsing capability is disabled, flags : %#x\n",
+			    bp->tunnel_disable_flag);
 unlock:
 	HWRM_UNLOCK();
 
diff --git a/drivers/net/bnxt/bnxt_hwrm.h b/drivers/net/bnxt/bnxt_hwrm.h
index 63f8d8c..77f8521 100644
--- a/drivers/net/bnxt/bnxt_hwrm.h
+++ b/drivers/net/bnxt/bnxt_hwrm.h
@@ -121,6 +121,26 @@ struct bnxt_pf_resource_info {
 
 #define BNXT_CTX_VAL_INVAL	0xFFFF
 
+#define BNXT_TUNNELED_OFFLOADS_CAP_VXLAN_EN(bp)		\
+	(!((bp)->tunnel_disable_flag & HWRM_FUNC_QCAPS_OUTPUT_TUNNEL_DISABLE_FLAG_DISABLE_VXLAN))
+#define BNXT_TUNNELED_OFFLOADS_CAP_NGE_EN(bp)		\
+	(!((bp)->tunnel_disable_flag & HWRM_FUNC_QCAPS_OUTPUT_TUNNEL_DISABLE_FLAG_DISABLE_NGE))
+#define BNXT_TUNNELED_OFFLOADS_CAP_GRE_EN(bp)		\
+	(!((bp)->tunnel_disable_flag & HWRM_FUNC_QCAPS_OUTPUT_TUNNEL_DISABLE_FLAG_DISABLE_GRE))
+#define BNXT_TUNNELED_OFFLOADS_CAP_IPINIP_EN(bp)	\
+	(!((bp)->tunnel_disable_flag & HWRM_FUNC_QCAPS_OUTPUT_TUNNEL_DISABLE_FLAG_DISABLE_IPINIP))
+
+/*
+ * If the device supports VXLAN, GRE, IPIP and GENEVE tunnel parsing, then report
+ * RTE_ETH_RX_OFFLOAD_OUTER_IPV4_CKSUM, RTE_ETH_RX_OFFLOAD_OUTER_UDP_CKSUM and
+ * RTE_ETH_TX_OFFLOAD_OUTER_IPV4_CKSUM in the Rx/Tx offload capabilities of the device.
+ */
+#define BNXT_TUNNELED_OFFLOADS_CAP_ALL_EN(bp)			\
+	(BNXT_TUNNELED_OFFLOADS_CAP_VXLAN_EN(bp) &&		\
+	 BNXT_TUNNELED_OFFLOADS_CAP_NGE_EN(bp)   &&		\
+	 BNXT_TUNNELED_OFFLOADS_CAP_GRE_EN(bp)   &&		\
+	 BNXT_TUNNELED_OFFLOADS_CAP_IPINIP_EN(bp))
+
 int bnxt_hwrm_cfa_l2_clear_rx_mask(struct bnxt *bp,
 				   struct bnxt_vnic_info *vnic);
 int bnxt_hwrm_cfa_l2_set_rx_mask(struct bnxt *bp, struct bnxt_vnic_info *vnic,
diff --git a/drivers/net/bnxt/bnxt_rxq.c b/drivers/net/bnxt/bnxt_rxq.c
index 8977138..8147404 100644
--- a/drivers/net/bnxt/bnxt_rxq.c
+++ b/drivers/net/bnxt/bnxt_rxq.c
@@ -34,14 +34,15 @@ uint64_t bnxt_get_rx_port_offloads(struct bnxt *bp)
 			  RTE_ETH_RX_OFFLOAD_SCATTER |
 			  RTE_ETH_RX_OFFLOAD_RSS_HASH;
 
-	rx_offload_capa |= RTE_ETH_RX_OFFLOAD_OUTER_IPV4_CKSUM |
-			   RTE_ETH_RX_OFFLOAD_OUTER_UDP_CKSUM;
-
 	if (bp->flags & BNXT_FLAG_PTP_SUPPORTED)
 		rx_offload_capa |= RTE_ETH_RX_OFFLOAD_TIMESTAMP;
 	if (bp->vnic_cap_flags & BNXT_VNIC_CAP_VLAN_RX_STRIP)
 		rx_offload_capa |= RTE_ETH_RX_OFFLOAD_VLAN_STRIP;
 
+	if (BNXT_TUNNELED_OFFLOADS_CAP_ALL_EN(bp))
+		rx_offload_capa |= RTE_ETH_RX_OFFLOAD_OUTER_IPV4_CKSUM |
+					RTE_ETH_RX_OFFLOAD_OUTER_UDP_CKSUM;
+
 	return rx_offload_capa;
 }
 
diff --git a/drivers/net/bnxt/bnxt_txq.c b/drivers/net/bnxt/bnxt_txq.c
index 86073a5..c8745ad 100644
--- a/drivers/net/bnxt/bnxt_txq.c
+++ b/drivers/net/bnxt/bnxt_txq.c
@@ -28,15 +28,21 @@ uint64_t bnxt_get_tx_port_offloads(struct bnxt *bp)
 			  RTE_ETH_TX_OFFLOAD_QINQ_INSERT |
 			  RTE_ETH_TX_OFFLOAD_MULTI_SEGS;
 
-	tx_offload_capa |= RTE_ETH_TX_OFFLOAD_OUTER_IPV4_CKSUM |
-			   RTE_ETH_TX_OFFLOAD_VXLAN_TNL_TSO |
-			   RTE_ETH_TX_OFFLOAD_GRE_TNL_TSO |
-			   RTE_ETH_TX_OFFLOAD_IPIP_TNL_TSO |
-			   RTE_ETH_TX_OFFLOAD_GENEVE_TNL_TSO;
-
 	if (bp->fw_cap & BNXT_FW_CAP_VLAN_TX_INSERT)
 		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_VLAN_INSERT;
 
+	if (BNXT_TUNNELED_OFFLOADS_CAP_ALL_EN(bp))
+		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_OUTER_IPV4_CKSUM;
+
+	if (BNXT_TUNNELED_OFFLOADS_CAP_VXLAN_EN(bp))
+		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_VXLAN_TNL_TSO;
+	if (BNXT_TUNNELED_OFFLOADS_CAP_GRE_EN(bp))
+		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_GRE_TNL_TSO;
+	if (BNXT_TUNNELED_OFFLOADS_CAP_NGE_EN(bp))
+		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_GENEVE_TNL_TSO;
+	if (BNXT_TUNNELED_OFFLOADS_CAP_IPINIP_EN(bp))
+		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_IPIP_TNL_TSO;
+
 	return tx_offload_capa;
 }
 
-- 
2.10.1