bnxt_en: Modify RX ring indexing logic.

Modify the RX indexing logic for both RX ring and RX aggregation ring just
like the TX logic.  Change it so that the index increments unbounded and
mask it only when needed.

Modify the existing RX macros so that the index is not masked.  Add new
macros RING_RX()/RING_RX_AGG() to mask it only when needed to get the
index of rxr->rx_buf_ring[] and rxr->rx_agg_ring[].
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231120234405.194542-12-michael.chan@broadcom.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -821,8 +821,8 @@ static inline u8 *__bnxt_alloc_rx_frag(struct bnxt *bp, dma_addr_t *mapping,
 int bnxt_alloc_rx_data(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
 		       u16 prod, gfp_t gfp)
 {
-	struct rx_bd *rxbd = &rxr->rx_desc_ring[RX_RING(prod)][RX_IDX(prod)];
-	struct bnxt_sw_rx_bd *rx_buf = &rxr->rx_buf_ring[prod];
+	struct rx_bd *rxbd = &rxr->rx_desc_ring[RX_RING(bp, prod)][RX_IDX(prod)];
+	struct bnxt_sw_rx_bd *rx_buf = &rxr->rx_buf_ring[RING_RX(bp, prod)];
 	dma_addr_t mapping;
 
 	if (BNXT_RX_PAGE_MODE(bp)) {
@@ -855,9 +855,10 @@ void bnxt_reuse_rx_data(struct bnxt_rx_ring_info *rxr, u16 cons, void *data)
 {
 	u16 prod = rxr->rx_prod;
 	struct bnxt_sw_rx_bd *cons_rx_buf, *prod_rx_buf;
+	struct bnxt *bp = rxr->bnapi->bp;
 	struct rx_bd *cons_bd, *prod_bd;
 
-	prod_rx_buf = &rxr->rx_buf_ring[prod];
+	prod_rx_buf = &rxr->rx_buf_ring[RING_RX(bp, prod)];
 	cons_rx_buf = &rxr->rx_buf_ring[cons];
 
 	prod_rx_buf->data = data;
@@ -865,8 +866,8 @@ void bnxt_reuse_rx_data(struct bnxt_rx_ring_info *rxr, u16 cons, void *data)
 
 	prod_rx_buf->mapping = cons_rx_buf->mapping;
 
-	prod_bd = &rxr->rx_desc_ring[RX_RING(prod)][RX_IDX(prod)];
-	cons_bd = &rxr->rx_desc_ring[RX_RING(cons)][RX_IDX(cons)];
+	prod_bd = &rxr->rx_desc_ring[RX_RING(bp, prod)][RX_IDX(prod)];
+	cons_bd = &rxr->rx_desc_ring[RX_RING(bp, cons)][RX_IDX(cons)];
 
 	prod_bd->rx_bd_haddr = cons_bd->rx_bd_haddr;
 }
@@ -886,7 +887,7 @@ static inline int bnxt_alloc_rx_page(struct bnxt *bp,
 				     u16 prod, gfp_t gfp)
 {
 	struct rx_bd *rxbd =
-		&rxr->rx_agg_desc_ring[RX_RING(prod)][RX_IDX(prod)];
+		&rxr->rx_agg_desc_ring[RX_AGG_RING(bp, prod)][RX_IDX(prod)];
 	struct bnxt_sw_rx_agg_bd *rx_agg_buf;
 	struct page *page;
 	dma_addr_t mapping;
@@ -903,7 +904,7 @@ static inline int bnxt_alloc_rx_page(struct bnxt *bp,
 
 	__set_bit(sw_prod, rxr->rx_agg_bmap);
 	rx_agg_buf = &rxr->rx_agg_ring[sw_prod];
-	rxr->rx_sw_agg_prod = NEXT_RX_AGG(sw_prod);
+	rxr->rx_sw_agg_prod = RING_RX_AGG(bp, NEXT_RX_AGG(sw_prod));
 
 	rx_agg_buf->page = page;
 	rx_agg_buf->offset = offset;
@@ -979,13 +980,13 @@ static void bnxt_reuse_rx_agg_bufs(struct bnxt_cp_ring_info *cpr, u16 idx,
 
 		prod_rx_buf->mapping = cons_rx_buf->mapping;
 
-		prod_bd = &rxr->rx_agg_desc_ring[RX_RING(prod)][RX_IDX(prod)];
+		prod_bd = &rxr->rx_agg_desc_ring[RX_AGG_RING(bp, prod)][RX_IDX(prod)];
 
 		prod_bd->rx_bd_haddr = cpu_to_le64(cons_rx_buf->mapping);
 		prod_bd->rx_bd_opaque = sw_prod;
 
 		prod = NEXT_RX_AGG(prod);
-		sw_prod = NEXT_RX_AGG(sw_prod);
+		sw_prod = RING_RX_AGG(bp, NEXT_RX_AGG(sw_prod));
 	}
 	rxr->rx_agg_prod = prod;
 	rxr->rx_sw_agg_prod = sw_prod;
@@ -1327,7 +1328,7 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
 	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];
+	prod_rx_buf = &rxr->rx_buf_ring[RING_RX(bp, prod)];
 	tpa_info = &rxr->rx_tpa[agg_id];
 
 	if (unlikely(cons != rxr->rx_next_cons ||
@@ -1348,7 +1349,7 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
 	mapping = tpa_info->mapping;
 	prod_rx_buf->mapping = mapping;
 
-	prod_bd = &rxr->rx_desc_ring[RX_RING(prod)][RX_IDX(prod)];
+	prod_bd = &rxr->rx_desc_ring[RX_RING(bp, prod)][RX_IDX(prod)];
 
 	prod_bd->rx_bd_haddr = cpu_to_le64(mapping);
 
@@ -1381,8 +1382,8 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
 	tpa_info->agg_count = 0;
 
 	rxr->rx_prod = NEXT_RX(prod);
-	cons = NEXT_RX(cons);
-	rxr->rx_next_cons = NEXT_RX(cons);
+	cons = RING_RX(bp, NEXT_RX(cons));
+	rxr->rx_next_cons = RING_RX(bp, NEXT_RX(cons));
 	cons_rx_buf = &rxr->rx_buf_ring[cons];
 
 	bnxt_reuse_rx_data(rxr, cons, cons_rx_buf->data);
@@ -2050,7 +2051,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 
 next_rx_no_len:
 	rxr->rx_prod = NEXT_RX(prod);
-	rxr->rx_next_cons = NEXT_RX(cons);
+	rxr->rx_next_cons = RING_RX(bp, NEXT_RX(cons));
 
 next_rx_no_prod_no_len:
 	*raw_cons = tmp_raw_cons;

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

@@ -686,7 +686,9 @@ struct nqe_cn {
  */
 #define BNXT_MIN_TX_DESC_CNT		(MAX_SKB_FRAGS + 2)
 
-#define RX_RING(x)	(((x) & ~(RX_DESC_CNT - 1)) >> (BNXT_PAGE_SHIFT - 4))
+#define RX_RING(bp, x)	(((x) & (bp)->rx_ring_mask) >> (BNXT_PAGE_SHIFT - 4))
+#define RX_AGG_RING(bp, x)	(((x) & (bp)->rx_agg_ring_mask) >>	\
+				 (BNXT_PAGE_SHIFT - 4))
 #define RX_IDX(x)	((x) & (RX_DESC_CNT - 1))
 
 #define TX_RING(bp, x)	(((x) & (bp)->tx_ring_mask) >> (BNXT_PAGE_SHIFT - 4))
@@ -716,9 +718,11 @@ struct nqe_cn {
 #define RX_CMP_TYPE(rxcmp)					\
 	(le32_to_cpu((rxcmp)->rx_cmp_len_flags_type) & RX_CMP_CMP_TYPE)
 
-#define NEXT_RX(idx)		(((idx) + 1) & bp->rx_ring_mask)
+#define RING_RX(bp, idx)	((idx) & (bp)->rx_ring_mask)
+#define NEXT_RX(idx)		((idx) + 1)
 
-#define NEXT_RX_AGG(idx)	(((idx) + 1) & bp->rx_agg_ring_mask)
+#define RING_RX_AGG(bp, idx)	((idx) & (bp)->rx_agg_ring_mask)
+#define NEXT_RX_AGG(idx)	((idx) + 1)
 
 #define RING_TX(bp, idx)	((idx) & (bp)->tx_ring_mask)
 #define NEXT_TX(idx)		((idx) + 1)