bnxt_en: Allocate completion ring structures for 57500 series chips.

On 57500 chips, the original bnxt_cp_ring_info struct now refers to the
NQ.  bp->cp_nr_rings refer to the number of NQs on 57500 chips.  There
are now 2 pointers for the CP rings associated with RX and TX rings.
Modify bnxt_alloc_cp_rings() and bnxt_free_cp_rings() accordingly.

With multiple CP rings per NAPI, we need to add a pointer in
bnxt_cp_ring_info struct to point back to the bnxt_napi struct.
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

@@ -2482,6 +2482,7 @@ static void bnxt_free_cp_rings(struct bnxt *bp)
 		struct bnxt_napi *bnapi = bp->bnapi[i];
 		struct bnxt_cp_ring_info *cpr;
 		struct bnxt_ring_struct *ring;
+		int j;
 
 		if (!bnapi)
 			continue;
@@ -2490,11 +2491,50 @@ static void bnxt_free_cp_rings(struct bnxt *bp)
 		ring = &cpr->cp_ring_struct;
 
 		bnxt_free_ring(bp, &ring->ring_mem);
+
+		for (j = 0; j < 2; j++) {
+			struct bnxt_cp_ring_info *cpr2 = cpr->cp_ring_arr[j];
+
+			if (cpr2) {
+				ring = &cpr2->cp_ring_struct;
+				bnxt_free_ring(bp, &ring->ring_mem);
+				kfree(cpr2);
+				cpr->cp_ring_arr[j] = NULL;
+			}
+		}
 	}
 }
 
+static struct bnxt_cp_ring_info *bnxt_alloc_cp_sub_ring(struct bnxt *bp)
+{
+	struct bnxt_ring_mem_info *rmem;
+	struct bnxt_ring_struct *ring;
+	struct bnxt_cp_ring_info *cpr;
+	int rc;
+
+	cpr = kzalloc(sizeof(*cpr), GFP_KERNEL);
+	if (!cpr)
+		return NULL;
+
+	ring = &cpr->cp_ring_struct;
+	rmem = &ring->ring_mem;
+	rmem->nr_pages = bp->cp_nr_pages;
+	rmem->page_size = HW_CMPD_RING_SIZE;
+	rmem->pg_arr = (void **)cpr->cp_desc_ring;
+	rmem->dma_arr = cpr->cp_desc_mapping;
+	rmem->flags = BNXT_RMEM_RING_PTE_FLAG;
+	rc = bnxt_alloc_ring(bp, rmem);
+	if (rc) {
+		bnxt_free_ring(bp, rmem);
+		kfree(cpr);
+		cpr = NULL;
+	}
+	return cpr;
+}
+
 static int bnxt_alloc_cp_rings(struct bnxt *bp)
 {
+	bool sh = !!(bp->flags & BNXT_FLAG_SHARED_RINGS);
 	int i, rc, ulp_base_vec, ulp_msix;
 
 	ulp_msix = bnxt_get_ulp_msix_num(bp);
@@ -2508,6 +2548,7 @@ static int bnxt_alloc_cp_rings(struct bnxt *bp)
 			continue;
 
 		cpr = &bnapi->cp_ring;
+		cpr->bnapi = bnapi;
 		ring = &cpr->cp_ring_struct;
 
 		rc = bnxt_alloc_ring(bp, &ring->ring_mem);
@@ -2518,6 +2559,29 @@ static int bnxt_alloc_cp_rings(struct bnxt *bp)
 			ring->map_idx = i + ulp_msix;
 		else
 			ring->map_idx = i;
+
+		if (!(bp->flags & BNXT_FLAG_CHIP_P5))
+			continue;
+
+		if (i < bp->rx_nr_rings) {
+			struct bnxt_cp_ring_info *cpr2 =
+				bnxt_alloc_cp_sub_ring(bp);
+
+			cpr->cp_ring_arr[BNXT_RX_HDL] = cpr2;
+			if (!cpr2)
+				return -ENOMEM;
+			cpr2->bnapi = bnapi;
+		}
+		if ((sh && i < bp->tx_nr_rings) ||
+		    (!sh && i >= bp->rx_nr_rings)) {
+			struct bnxt_cp_ring_info *cpr2 =
+				bnxt_alloc_cp_sub_ring(bp);
+
+			cpr->cp_ring_arr[BNXT_TX_HDL] = cpr2;
+			if (!cpr2)
+				return -ENOMEM;
+			cpr2->bnapi = bnapi;
+		}
 	}
 	return 0;
 }

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

@@ -787,6 +787,7 @@ struct bnxt_rx_ring_info {
 };
 
 struct bnxt_cp_ring_info {
+	struct bnxt_napi	*bnapi;
 	u32			cp_raw_cons;
 	struct bnxt_db_info	cp_db;
 
@@ -812,6 +813,8 @@ struct bnxt_cp_ring_info {
 	struct bnxt_ring_struct	cp_ring_struct;
 
 	struct bnxt_cp_ring_info *cp_ring_arr[2];
+#define BNXT_RX_HDL	0
+#define BNXT_TX_HDL	1
 };
 
 struct bnxt_napi {