netdev - [net-next 2/9] net/mlx5e: XDP, Precede XDP-related operations in RQ poll by a loaded program check

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Message-Id: <20181221070647.12219-3-saeedm@mellanox.com>
Date:   Thu, 20 Dec 2018 23:06:40 -0800
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Tariq Toukan <tariqt@...lanox.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Tal Gilboa <talgi@...lanox.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Pawel Staszewski <pstaszewski@...are.pl>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 2/9] net/mlx5e: XDP, Precede XDP-related operations in RQ poll by a loaded program check

From: Tariq Toukan <tariqt@...lanox.com>

At the end of the RQ polling loop, some XDP-related operations
might be required. Before checking them one by one, check if
an XDP program is even loaded.
Combine all the checks and operations in a single function in xdp files.

This saves unnecessary checks for non-XDP flows.

Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c | 15 +++++++++++++++
 drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h |  2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c  | 12 ++----------
 3 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
index ad6d471d00dd..cf22ea529c53 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
@@ -305,3 +305,18 @@ int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 
 	return n - drops;
 }
+
+void mlx5e_xdp_rx_poll_complete(struct mlx5e_rq *rq)
+{
+	struct mlx5e_xdpsq *xdpsq = &rq->xdpsq;
+
+	if (xdpsq->doorbell) {
+		mlx5e_xmit_xdp_doorbell(xdpsq);
+		xdpsq->doorbell = false;
+	}
+
+	if (xdpsq->redirect_flush) {
+		xdp_do_flush_map();
+		xdpsq->redirect_flush = false;
+	}
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
index 6dfab045925f..eecc0392fcff 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
@@ -44,7 +44,7 @@ bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct mlx5e_dma_info *di,
 		      void *va, u16 *rx_headroom, u32 *len);
 bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq);
 void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq);
-
+void mlx5e_xdp_rx_poll_complete(struct mlx5e_rq *rq);
 bool mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xdp_info *xdpi);
 int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 		   u32 flags);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index cdce30a95c60..1d0bb5ff8c26 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -1190,7 +1190,6 @@ void mlx5e_handle_rx_cqe_mpwrq(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
 int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
 {
 	struct mlx5e_rq *rq = container_of(cq, struct mlx5e_rq, cq);
-	struct mlx5e_xdpsq *xdpsq = &rq->xdpsq;
 	struct mlx5_cqe64 *cqe;
 	int work_done = 0;
 
@@ -1221,15 +1220,8 @@ int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
 	} while ((++work_done < budget) && (cqe = mlx5_cqwq_get_cqe(&cq->wq)));
 
 out:
-	if (xdpsq->doorbell) {
-		mlx5e_xmit_xdp_doorbell(xdpsq);
-		xdpsq->doorbell = false;
-	}
-
-	if (xdpsq->redirect_flush) {
-		xdp_do_flush_map();
-		xdpsq->redirect_flush = false;
-	}
+	if (rq->xdp_prog)
+		mlx5e_xdp_rx_poll_complete(rq);
 
 	mlx5_cqwq_update_db_record(&cq->wq);
 
-- 
2.19.2