bnxt_en: Add RSS support for IPSEC headers

IPSec uses two distinct protocols, Authentication Header (AH) and
Encapsulating Security Payload (ESP).
Add support to configure RSS based on AH and ESP headers.
This functionality will be enabled based on the capabilities
indicated by the firmware in HWRM_VNIC_QCAPS.

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20240205223202.25341-14-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -6099,10 +6099,13 @@ static void
 __bnxt_hwrm_vnic_set_rss(struct bnxt *bp, struct hwrm_vnic_rss_cfg_input *req,
 			 struct bnxt_vnic_info *vnic)
 {
-	if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
+	if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) {
 		bnxt_fill_hw_rss_tbl_p5(bp, vnic);
-	else
+		if (bp->flags & BNXT_FLAG_CHIP_P7)
+			req->flags |= VNIC_RSS_CFG_REQ_FLAGS_IPSEC_HASH_TYPE_CFG_SUPPORT;
+	} else {
 		bnxt_fill_hw_rss_tbl(bp, vnic);
+	}
 
 	if (bp->rss_hash_delta) {
 		req->hash_type = cpu_to_le32(bp->rss_hash_delta);
@@ -6465,6 +6468,14 @@ static int bnxt_hwrm_vnic_qcaps(struct bnxt *bp)
 		}
 		if (flags & VNIC_QCAPS_RESP_FLAGS_HW_TUNNEL_TPA_CAP)
 			bp->fw_cap |= BNXT_FW_CAP_VNIC_TUNNEL_TPA;
+		if (flags & VNIC_QCAPS_RESP_FLAGS_RSS_IPSEC_AH_SPI_IPV4_CAP)
+			bp->rss_cap |= BNXT_RSS_CAP_AH_V4_RSS_CAP;
+		if (flags & VNIC_QCAPS_RESP_FLAGS_RSS_IPSEC_AH_SPI_IPV6_CAP)
+			bp->rss_cap |= BNXT_RSS_CAP_AH_V6_RSS_CAP;
+		if (flags & VNIC_QCAPS_RESP_FLAGS_RSS_IPSEC_ESP_SPI_IPV4_CAP)
+			bp->rss_cap |= BNXT_RSS_CAP_ESP_V4_RSS_CAP;
+		if (flags & VNIC_QCAPS_RESP_FLAGS_RSS_IPSEC_ESP_SPI_IPV6_CAP)
+			bp->rss_cap |= BNXT_RSS_CAP_ESP_V6_RSS_CAP;
 	}
 	hwrm_req_drop(bp, req);
 	return rc;

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -2221,6 +2221,10 @@ struct bnxt {
 #define BNXT_RSS_CAP_UDP_RSS_CAP		BIT(1)
 #define BNXT_RSS_CAP_NEW_RSS_CAP		BIT(2)
 #define BNXT_RSS_CAP_RSS_TCAM			BIT(3)
+#define BNXT_RSS_CAP_AH_V4_RSS_CAP		BIT(4)
+#define BNXT_RSS_CAP_AH_V6_RSS_CAP		BIT(5)
+#define BNXT_RSS_CAP_ESP_V4_RSS_CAP		BIT(6)
+#define BNXT_RSS_CAP_ESP_V6_RSS_CAP		BIT(7)
 
 	u8			rss_hash_key[HW_HASH_KEY_SIZE];
 	u8			rss_hash_key_valid:1;

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -1533,8 +1533,14 @@ static int bnxt_grxfh(struct bnxt *bp, struct ethtool_rxnfc *cmd)
 			cmd->data |= RXH_IP_SRC | RXH_IP_DST |
 				     RXH_L4_B_0_1 | RXH_L4_B_2_3;
 		fallthrough;
-	case SCTP_V4_FLOW:
 	case AH_ESP_V4_FLOW:
+		if (bp->rss_hash_cfg &
+		    (VNIC_RSS_CFG_REQ_HASH_TYPE_AH_SPI_IPV4 |
+		     VNIC_RSS_CFG_REQ_HASH_TYPE_ESP_SPI_IPV4))
+			cmd->data |= RXH_IP_SRC | RXH_IP_DST |
+				     RXH_L4_B_0_1 | RXH_L4_B_2_3;
+		fallthrough;
+	case SCTP_V4_FLOW:
 	case AH_V4_FLOW:
 	case ESP_V4_FLOW:
 	case IPV4_FLOW:
@@ -1552,8 +1558,14 @@ static int bnxt_grxfh(struct bnxt *bp, struct ethtool_rxnfc *cmd)
 			cmd->data |= RXH_IP_SRC | RXH_IP_DST |
 				     RXH_L4_B_0_1 | RXH_L4_B_2_3;
 		fallthrough;
-	case SCTP_V6_FLOW:
 	case AH_ESP_V6_FLOW:
+		if (bp->rss_hash_cfg &
+		    (VNIC_RSS_CFG_REQ_HASH_TYPE_AH_SPI_IPV6 |
+		     VNIC_RSS_CFG_REQ_HASH_TYPE_ESP_SPI_IPV6))
+			cmd->data |= RXH_IP_SRC | RXH_IP_DST |
+				     RXH_L4_B_0_1 | RXH_L4_B_2_3;
+		fallthrough;
+	case SCTP_V6_FLOW:
 	case AH_V6_FLOW:
 	case ESP_V6_FLOW:
 	case IPV6_FLOW:
@@ -1600,6 +1612,24 @@ static int bnxt_srxfh(struct bnxt *bp, struct ethtool_rxnfc *cmd)
 		rss_hash_cfg &= ~VNIC_RSS_CFG_REQ_HASH_TYPE_UDP_IPV6;
 		if (tuple == 4)
 			rss_hash_cfg |= VNIC_RSS_CFG_REQ_HASH_TYPE_UDP_IPV6;
+	} else if (cmd->flow_type == AH_ESP_V4_FLOW) {
+		if (tuple == 4 && (!(bp->rss_cap & BNXT_RSS_CAP_AH_V4_RSS_CAP) ||
+				   !(bp->rss_cap & BNXT_RSS_CAP_ESP_V4_RSS_CAP)))
+			return -EINVAL;
+		rss_hash_cfg &= ~(VNIC_RSS_CFG_REQ_HASH_TYPE_AH_SPI_IPV4 |
+				  VNIC_RSS_CFG_REQ_HASH_TYPE_ESP_SPI_IPV4);
+		if (tuple == 4)
+			rss_hash_cfg |= VNIC_RSS_CFG_REQ_HASH_TYPE_AH_SPI_IPV4 |
+					VNIC_RSS_CFG_REQ_HASH_TYPE_ESP_SPI_IPV4;
+	} else if (cmd->flow_type == AH_ESP_V6_FLOW) {
+		if (tuple == 4 && (!(bp->rss_cap & BNXT_RSS_CAP_AH_V6_RSS_CAP) ||
+				   !(bp->rss_cap & BNXT_RSS_CAP_ESP_V6_RSS_CAP)))
+			return -EINVAL;
+		rss_hash_cfg &= ~(VNIC_RSS_CFG_REQ_HASH_TYPE_AH_SPI_IPV6 |
+				  VNIC_RSS_CFG_REQ_HASH_TYPE_ESP_SPI_IPV6);
+		if (tuple == 4)
+			rss_hash_cfg |= VNIC_RSS_CFG_REQ_HASH_TYPE_AH_SPI_IPV6 |
+					VNIC_RSS_CFG_REQ_HASH_TYPE_ESP_SPI_IPV6;
 	} else if (tuple == 4) {
 		return -EINVAL;
 	}