bnxt_en: Refactor and refine bnxt_tpa_start() and bnxt_tpa_end().

Refactor bnxt_tpa_start() by adding bnxt_tpa_metadata() to gather the
metadata from the TPA_START completion.  This makes it easier to
support the new P7 chip which has a modified TPA_START completion
structure with different metadata formats.  We also add vlan_valid
and cfa_code_valid fields to the bnxt_tpa_info structure so that the
VLAN and VF rep logic can be common for all chips.  The VLAN metadata
is now collected in bnxt_tpa_start() only when it is valid and the
vlan_valid field will be set.  bnxt_tpa_end() can now use common VLAN
logic for all chips.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231201223924.26955-10-michael.chan@broadcom.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -1315,8 +1315,22 @@ static u16 bnxt_lookup_agg_idx(struct bnxt_rx_ring_info *rxr, u16 agg_id)
 	return map->agg_id_tbl[agg_id];
 }
 
+static void bnxt_tpa_metadata(struct bnxt_tpa_info *tpa_info,
+			      struct rx_tpa_start_cmp *tpa_start,
+			      struct rx_tpa_start_cmp_ext *tpa_start1)
+{
+	tpa_info->cfa_code_valid = 1;
+	tpa_info->cfa_code = TPA_START_CFA_CODE(tpa_start1);
+	tpa_info->vlan_valid = 0;
+	if (tpa_info->flags2 & RX_CMP_FLAGS2_META_FORMAT_VLAN) {
+		tpa_info->vlan_valid = 1;
+		tpa_info->metadata =
+			le32_to_cpu(tpa_start1->rx_tpa_start_cmp_metadata);
+	}
+}
+
 static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
-			   struct rx_tpa_start_cmp *tpa_start,
+			   u8 cmp_type, struct rx_tpa_start_cmp *tpa_start,
 			   struct rx_tpa_start_cmp_ext *tpa_start1)
 {
 	struct bnxt_sw_rx_bd *cons_rx_buf, *prod_rx_buf;
@@ -1345,10 +1359,6 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
 		bnxt_sched_reset_rxr(bp, rxr);
 		return;
 	}
-	/* Store cfa_code in tpa_info to use in tpa_end
-	 * completion processing.
-	 */
-	tpa_info->cfa_code = TPA_START_CFA_CODE(tpa_start1);
 	prod_rx_buf->data = tpa_info->data;
 	prod_rx_buf->data_ptr = tpa_info->data_ptr;
 
@@ -1383,8 +1393,8 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
 		netif_warn(bp, rx_err, bp->dev, "TPA packet without valid hash\n");
 	}
 	tpa_info->flags2 = le32_to_cpu(tpa_start1->rx_tpa_start_cmp_flags2);
-	tpa_info->metadata = le32_to_cpu(tpa_start1->rx_tpa_start_cmp_metadata);
 	tpa_info->hdr_info = le32_to_cpu(tpa_start1->rx_tpa_start_cmp_hdr_info);
+	bnxt_tpa_metadata(tpa_info, tpa_start, tpa_start1);
 	tpa_info->agg_count = 0;
 
 	rxr->rx_prod = NEXT_RX(prod);
@@ -1619,6 +1629,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
 {
 	struct bnxt_napi *bnapi = cpr->bnapi;
 	struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
+	struct net_device *dev = bp->dev;
 	u8 *data_ptr, agg_bufs;
 	unsigned int len;
 	struct bnxt_tpa_info *tpa_info;
@@ -1725,14 +1736,15 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
 		}
 	}
 
-	skb->protocol =
-		eth_type_trans(skb, bnxt_get_pkt_dev(bp, tpa_info->cfa_code));
+	if (tpa_info->cfa_code_valid)
+		dev = bnxt_get_pkt_dev(bp, tpa_info->cfa_code);
+	skb->protocol = eth_type_trans(skb, dev);
 
 	if (tpa_info->hash_type != PKT_HASH_TYPE_NONE)
 		skb_set_hash(skb, tpa_info->rss_hash, tpa_info->hash_type);
 
-	if ((tpa_info->flags2 & RX_CMP_FLAGS2_META_FORMAT_VLAN) &&
-	    (skb->dev->features & BNXT_HW_FEATURE_VLAN_ALL_RX)) {
+	if (tpa_info->vlan_valid &&
+	    (dev->features & BNXT_HW_FEATURE_VLAN_ALL_RX)) {
 		__be16 vlan_proto = htons(tpa_info->metadata >>
 					  RX_CMP_FLAGS2_METADATA_TPID_SFT);
 		u16 vtag = tpa_info->metadata & RX_CMP_FLAGS2_METADATA_TCI_MASK;
@@ -1864,7 +1876,8 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 	prod = rxr->rx_prod;
 
 	if (cmp_type == CMP_TYPE_RX_L2_TPA_START_CMP) {
-		bnxt_tpa_start(bp, rxr, (struct rx_tpa_start_cmp *)rxcmp,
+		bnxt_tpa_start(bp, rxr, cmp_type,
+			       (struct rx_tpa_start_cmp *)rxcmp,
 			       (struct rx_tpa_start_cmp_ext *)rxcmp1);
 
 		*event |= BNXT_RX_EVENT;

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

@@ -1027,6 +1027,8 @@ struct bnxt_tpa_info {
 
 	u16			cfa_code; /* cfa_code in TPA start compl */
 	u8			agg_count;
+	u8			vlan_valid:1;
+	u8			cfa_code_valid:1;
 	struct rx_agg_cmp	*agg_arr;
 };