bnxt_en: Add fast path logic for TPA on 57500 chips.

With all the previous refactoring, the TPA fast path can now be
modified slightly to support TPA on the new chips.  The main
difference is that the agg completions are retrieved differently using
the bnxt_get_tpa_agg_p5() function on the new chips.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -840,6 +840,15 @@ static struct rx_agg_cmp *bnxt_get_agg(struct bnxt *bp,
 	return agg;
 }
 
+static struct rx_agg_cmp *bnxt_get_tpa_agg_p5(struct bnxt *bp,
+					      struct bnxt_rx_ring_info *rxr,
+					      u16 agg_id, u16 curr)
+{
+	struct bnxt_tpa_info *tpa_info = &rxr->rx_tpa[agg_id];
+
+	return &tpa_info->agg_arr[curr];
+}
+
 static void bnxt_reuse_rx_agg_bufs(struct bnxt_cp_ring_info *cpr, u16 idx,
 				   u16 start, u32 agg_bufs, bool tpa)
 {
@@ -848,8 +857,12 @@ static void bnxt_reuse_rx_agg_bufs(struct bnxt_cp_ring_info *cpr, u16 idx,
 	struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
 	u16 prod = rxr->rx_agg_prod;
 	u16 sw_prod = rxr->rx_sw_agg_prod;
+	bool p5_tpa = false;
 	u32 i;
 
+	if ((bp->flags & BNXT_FLAG_CHIP_P5) && tpa)
+		p5_tpa = true;
+
 	for (i = 0; i < agg_bufs; i++) {
 		u16 cons;
 		struct rx_agg_cmp *agg;
@@ -857,7 +870,10 @@ static void bnxt_reuse_rx_agg_bufs(struct bnxt_cp_ring_info *cpr, u16 idx,
 		struct rx_bd *prod_bd;
 		struct page *page;
 
-		agg = bnxt_get_agg(bp, cpr, idx, start + i);
+		if (p5_tpa)
+			agg = bnxt_get_tpa_agg_p5(bp, rxr, idx, start + i);
+		else
+			agg = bnxt_get_agg(bp, cpr, idx, start + i);
 		cons = agg->rx_agg_cmp_opaque;
 		__clear_bit(cons, rxr->rx_agg_bmap);
 
@@ -974,8 +990,12 @@ static struct sk_buff *bnxt_rx_pages(struct bnxt *bp,
 	struct pci_dev *pdev = bp->pdev;
 	struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
 	u16 prod = rxr->rx_agg_prod;
+	bool p5_tpa = false;
 	u32 i;
 
+	if ((bp->flags & BNXT_FLAG_CHIP_P5) && tpa)
+		p5_tpa = true;
+
 	for (i = 0; i < agg_bufs; i++) {
 		u16 cons, frag_len;
 		struct rx_agg_cmp *agg;
@@ -983,7 +1003,10 @@ static struct sk_buff *bnxt_rx_pages(struct bnxt *bp,
 		struct page *page;
 		dma_addr_t mapping;
 
-		agg = bnxt_get_agg(bp, cpr, idx, i);
+		if (p5_tpa)
+			agg = bnxt_get_tpa_agg_p5(bp, rxr, idx, i);
+		else
+			agg = bnxt_get_agg(bp, cpr, idx, i);
 		cons = agg->rx_agg_cmp_opaque;
 		frag_len = (le32_to_cpu(agg->rx_agg_cmp_len_flags_type) &
 			    RX_AGG_CMP_LEN) >> RX_AGG_CMP_LEN_SHIFT;
@@ -1089,6 +1112,9 @@ static int bnxt_discard_rx(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 	} else if (cmp_type == CMP_TYPE_RX_L2_TPA_END_CMP) {
 		struct rx_tpa_end_cmp *tpa_end = cmp;
 
+		if (bp->flags & BNXT_FLAG_CHIP_P5)
+			return 0;
+
 		agg_bufs = TPA_END_AGG_BUFS(tpa_end);
 	}
 
@@ -1130,22 +1156,27 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
 			   struct rx_tpa_start_cmp *tpa_start,
 			   struct rx_tpa_start_cmp_ext *tpa_start1)
 {
-	u8 agg_id = TPA_START_AGG_ID(tpa_start);
-	u16 cons, prod;
-	struct bnxt_tpa_info *tpa_info;
 	struct bnxt_sw_rx_bd *cons_rx_buf, *prod_rx_buf;
+	struct bnxt_tpa_info *tpa_info;
+	u16 cons, prod, agg_id;
 	struct rx_bd *prod_bd;
 	dma_addr_t mapping;
 
+	if (bp->flags & BNXT_FLAG_CHIP_P5)
+		agg_id = TPA_START_AGG_ID_P5(tpa_start);
+	else
+		agg_id = TPA_START_AGG_ID(tpa_start);
 	cons = tpa_start->rx_tpa_start_cmp_opaque;
 	prod = rxr->rx_prod;
 	cons_rx_buf = &rxr->rx_buf_ring[cons];
 	prod_rx_buf = &rxr->rx_buf_ring[prod];
 	tpa_info = &rxr->rx_tpa[agg_id];
 
-	if (unlikely(cons != rxr->rx_next_cons)) {
-		netdev_warn(bp->dev, "TPA cons %x != expected cons %x\n",
-			    cons, rxr->rx_next_cons);
+	if (unlikely(cons != rxr->rx_next_cons ||
+		     TPA_START_ERROR(tpa_start))) {
+		netdev_warn(bp->dev, "TPA cons %x, expected cons %x, error code %x\n",
+			    cons, rxr->rx_next_cons,
+			    TPA_START_ERROR_CODE(tpa_start1));
 		bnxt_sched_reset(bp, rxr);
 		return;
 	}
@@ -1190,6 +1221,7 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
 	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);
+	tpa_info->agg_count = 0;
 
 	rxr->rx_prod = NEXT_RX(prod);
 	cons = NEXT_RX(cons);
@@ -1363,7 +1395,10 @@ static inline struct sk_buff *bnxt_gro_skb(struct bnxt *bp,
 	skb_shinfo(skb)->gso_size =
 		le32_to_cpu(tpa_end1->rx_tpa_end_cmp_seg_len);
 	skb_shinfo(skb)->gso_type = tpa_info->gso_type;
-	payload_off = TPA_END_PAYLOAD_OFF(tpa_end);
+	if (bp->flags & BNXT_FLAG_CHIP_P5)
+		payload_off = TPA_END_PAYLOAD_OFF_P5(tpa_end1);
+	else
+		payload_off = TPA_END_PAYLOAD_OFF(tpa_end);
 	skb = bp->gro_func(tpa_info, payload_off, TPA_END_GRO_TS(tpa_end), skb);
 	if (likely(skb))
 		tcp_gro_complete(skb);
@@ -1391,14 +1426,14 @@ 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;
-	u8 agg_id = TPA_END_AGG_ID(tpa_end);
 	u8 *data_ptr, agg_bufs;
 	unsigned int len;
 	struct bnxt_tpa_info *tpa_info;
 	dma_addr_t mapping;
 	struct sk_buff *skb;
-	u16 idx = 0;
+	u16 idx = 0, agg_id;
 	void *data;
+	bool gro;
 
 	if (unlikely(bnapi->in_reset)) {
 		int rc = bnxt_discard_rx(bp, cpr, raw_cons, tpa_end);
@@ -1408,24 +1443,39 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
 		return NULL;
 	}
 
-	tpa_info = &rxr->rx_tpa[agg_id];
+	if (bp->flags & BNXT_FLAG_CHIP_P5) {
+		agg_id = TPA_END_AGG_ID_P5(tpa_end);
+		agg_bufs = TPA_END_AGG_BUFS_P5(tpa_end1);
+		tpa_info = &rxr->rx_tpa[agg_id];
+		if (unlikely(agg_bufs != tpa_info->agg_count)) {
+			netdev_warn(bp->dev, "TPA end agg_buf %d != expected agg_bufs %d\n",
+				    agg_bufs, tpa_info->agg_count);
+			agg_bufs = tpa_info->agg_count;
+		}
+		tpa_info->agg_count = 0;
+		*event |= BNXT_AGG_EVENT;
+		idx = agg_id;
+		gro = !!(bp->flags & BNXT_FLAG_GRO);
+	} else {
+		agg_id = TPA_END_AGG_ID(tpa_end);
+		agg_bufs = TPA_END_AGG_BUFS(tpa_end);
+		tpa_info = &rxr->rx_tpa[agg_id];
+		idx = RING_CMP(*raw_cons);
+		if (agg_bufs) {
+			if (!bnxt_agg_bufs_valid(bp, cpr, agg_bufs, raw_cons))
+				return ERR_PTR(-EBUSY);
+
+			*event |= BNXT_AGG_EVENT;
+			idx = NEXT_CMP(idx);
+		}
+		gro = !!TPA_END_GRO(tpa_end);
+	}
 	data = tpa_info->data;
 	data_ptr = tpa_info->data_ptr;
 	prefetch(data_ptr);
 	len = tpa_info->len;
 	mapping = tpa_info->mapping;
 
-	agg_bufs = TPA_END_AGG_BUFS(tpa_end);
-
-	if (agg_bufs) {
-		idx = RING_CMP(*raw_cons);
-		if (!bnxt_agg_bufs_valid(bp, cpr, agg_bufs, raw_cons))
-			return ERR_PTR(-EBUSY);
-
-		*event |= BNXT_AGG_EVENT;
-		idx = NEXT_CMP(idx);
-	}
-
 	if (unlikely(agg_bufs > MAX_SKB_FRAGS || TPA_END_ERRORS(tpa_end1))) {
 		bnxt_abort_tpa(cpr, idx, agg_bufs);
 		if (agg_bufs > MAX_SKB_FRAGS)
@@ -1498,7 +1548,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
 			(tpa_info->flags2 & RX_CMP_FLAGS2_T_L4_CS_CALC) >> 3;
 	}
 
-	if (TPA_END_GRO(tpa_end))
+	if (gro)
 		skb = bnxt_gro_skb(bp, tpa_info, tpa_end, tpa_end1, skb);
 
 	return skb;
@@ -10785,7 +10835,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 #endif
 	if (BNXT_SUPPORTS_TPA(bp)) {
 		bp->gro_func = bnxt_gro_func_5730x;
-		if (BNXT_CHIP_P4(bp))
+		if (BNXT_CHIP_P4_PLUS(bp))
 			bp->gro_func = bnxt_gro_func_5731x;
 	}
 	if (!BNXT_CHIP_P4_PLUS(bp))