netdev - [PATCH net-next 11/12] net/mlx5e: Introduce a fenced NOP WQE posting function

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Date:   Fri,  5 Jul 2019 18:30:21 +0300
From:   Tariq Toukan <tariqt@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        moshe@...lanox.com, Tariq Toukan <tariqt@...lanox.com>
Subject: [PATCH net-next 11/12] net/mlx5e: Introduce a fenced NOP WQE posting function

Similar to the existing mlx5e_post_nop(), but marks a fence
in the WQE control segment.

Added as a separate new function to not hurt the performance
of the common case.

To be used in a downstream patch of the series.

Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Reviewed-by: Boris Pismenny <borisp@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
index af6aec717d4e..ef16f9e41cf4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
@@ -58,6 +58,24 @@
 	return wqe;
 }
 
+static inline struct mlx5e_tx_wqe *
+mlx5e_post_nop_fence(struct mlx5_wq_cyc *wq, u32 sqn, u16 *pc)
+{
+	u16                         pi   = mlx5_wq_cyc_ctr2ix(wq, *pc);
+	struct mlx5e_tx_wqe        *wqe  = mlx5_wq_cyc_get_wqe(wq, pi);
+	struct mlx5_wqe_ctrl_seg   *cseg = &wqe->ctrl;
+
+	memset(cseg, 0, sizeof(*cseg));
+
+	cseg->opmod_idx_opcode = cpu_to_be32((*pc << 8) | MLX5_OPCODE_NOP);
+	cseg->qpn_ds           = cpu_to_be32((sqn << 8) | 0x01);
+	cseg->fm_ce_se         = MLX5_FENCE_MODE_INITIATOR_SMALL;
+
+	(*pc)++;
+
+	return wqe;
+}
+
 static inline void
 mlx5e_fill_sq_frag_edge(struct mlx5e_txqsq *sq, struct mlx5_wq_cyc *wq,
 			u16 pi, u16 nnops)
-- 
1.8.3.1