net/mlx5: Make get_cqe routine not ethernet-specific

Move mlx5e_get_cqe routine to wq.h and rename it to
mlx5_cqwq_get_cqe.

This allows it to be used by other CQ users outside of the
ethernet driver code.

A later patch in this patchset will make use of it from
FPGA code for the FPGA high-speed connection.
Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -833,7 +833,6 @@ void mlx5e_dealloc_rx_wqe(struct mlx5e_rq *rq, u16 ix);
 void mlx5e_dealloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix);
 void mlx5e_post_rx_mpwqe(struct mlx5e_rq *rq);
 void mlx5e_free_rx_mpwqe(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi);
-struct mlx5_cqe64 *mlx5e_get_cqe(struct mlx5e_cq *cq);
 
 void mlx5e_rx_am(struct mlx5e_rq *rq);
 void mlx5e_rx_am_work(struct work_struct *work);

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

@@ -996,7 +996,7 @@ int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
 		work_done += mlx5e_decompress_cqes_cont(rq, cq, 0, budget);
 
 	for (; work_done < budget; work_done++) {
-		struct mlx5_cqe64 *cqe = mlx5e_get_cqe(cq);
+		struct mlx5_cqe64 *cqe = mlx5_cqwq_get_cqe(&cq->wq);
 
 		if (!cqe)
 			break;
@@ -1050,7 +1050,7 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
 		u16 wqe_counter;
 		bool last_wqe;
 
-		cqe = mlx5e_get_cqe(cq);
+		cqe = mlx5_cqwq_get_cqe(&cq->wq);
 		if (!cqe)
 			break;
 

drivers/net/ethernet/mellanox/mlx5/core/en_tx.c

@@ -409,7 +409,7 @@ bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq, int napi_budget)
 		u16 wqe_counter;
 		bool last_wqe;
 
-		cqe = mlx5e_get_cqe(cq);
+		cqe = mlx5_cqwq_get_cqe(&cq->wq);
 		if (!cqe)
 			break;
 

drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c

@@ -32,23 +32,6 @@
 
 #include "en.h"
 
-struct mlx5_cqe64 *mlx5e_get_cqe(struct mlx5e_cq *cq)
-{
-	struct mlx5_cqwq *wq = &cq->wq;
-	u32 ci = mlx5_cqwq_get_ci(wq);
-	struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci);
-	u8 cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK;
-	u8 sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1;
-
-	if (cqe_ownership_bit != sw_ownership_val)
-		return NULL;
-
-	/* ensure cqe content is read after cqe ownership bit */
-	dma_rmb();
-
-	return cqe;
-}
-
 static inline void mlx5e_poll_ico_single_cqe(struct mlx5e_cq *cq,
 					     struct mlx5e_icosq *sq,
 					     struct mlx5_cqe64 *cqe,
@@ -89,7 +72,7 @@ static void mlx5e_poll_ico_cq(struct mlx5e_cq *cq)
 	if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state)))
 		return;
 
-	cqe = mlx5e_get_cqe(cq);
+	cqe = mlx5_cqwq_get_cqe(&cq->wq);
 	if (likely(!cqe))
 		return;
 

drivers/net/ethernet/mellanox/mlx5/core/wq.h

@@ -34,6 +34,7 @@
 #define __MLX5_WQ_H__
 
 #include <linux/mlx5/mlx5_ifc.h>
+#include <linux/mlx5/cq.h>
 
 struct mlx5_wq_param {
 	int		linear;
@@ -146,6 +147,22 @@ static inline void mlx5_cqwq_update_db_record(struct mlx5_cqwq *wq)
 	*wq->db = cpu_to_be32(wq->cc & 0xffffff);
 }
 
+static inline struct mlx5_cqe64 *mlx5_cqwq_get_cqe(struct mlx5_cqwq *wq)
+{
+	u32 ci = mlx5_cqwq_get_ci(wq);
+	struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci);
+	u8 cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK;
+	u8 sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1;
+
+	if (cqe_ownership_bit != sw_ownership_val)
+		return NULL;
+
+	/* ensure cqe content is read after cqe ownership bit */
+	dma_rmb();
+
+	return cqe;
+}
+
 static inline int mlx5_wq_ll_is_full(struct mlx5_wq_ll *wq)
 {
 	return wq->cur_sz == wq->sz_m1;