From: Maxim Mikityanskiy <maximmi@mellanox.com>
Date: Wed, 14 Aug 2019 09:27:22 +0200
Subject: net/mlx5e: Move the SW XSK code from NAPI poll to a separate function
Patch-mainline: v5.4-rc1
Git-commit: 871aa189a69f7bbe6254459d17b78e1cce65c9ae
References: jsc#SLE-8464

Two XSK tasks are performed during NAPI polling, that are not bound to
hardware interrupts: TXing packets and polling for frames in the Fill
Ring. They are special in a way that the hardware doesn't know about
these tasks, so it doesn't trigger interrupts if there is still some
work to be done, it's our driver's responsibility to ensure NAPI will be
rescheduled if needed.

Create a new function to handle these tasks and move the corresponding
code from mlx5e_napi_poll to the new function to improve modularity and
prepare for the changes in the following patch.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
@@ -81,6 +81,16 @@ void mlx5e_trigger_irq(struct mlx5e_icos
 	mlx5e_notify_hw(wq, sq->pc, sq->uar_map, &nopwqe->ctrl);
 }
 
+static bool mlx5e_napi_xsk_post(struct mlx5e_xdpsq *xsksq, struct mlx5e_rq *xskrq)
+{
+	bool busy_xsk = false;
+
+	busy_xsk |= mlx5e_xsk_tx(xsksq, MLX5E_TX_XSK_POLL_BUDGET);
+	busy_xsk |= xskrq->post_wqes(xskrq);
+
+	return busy_xsk;
+}
+
 int mlx5e_napi_poll(struct napi_struct *napi, int budget)
 {
 	struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel,
@@ -122,8 +132,7 @@ int mlx5e_napi_poll(struct napi_struct *
 	if (xsk_open) {
 		mlx5e_poll_ico_cq(&c->xskicosq.cq);
 		busy |= mlx5e_poll_xdpsq_cq(&xsksq->cq);
-		busy_xsk |= mlx5e_xsk_tx(xsksq, MLX5E_TX_XSK_POLL_BUDGET);
-		busy_xsk |= xskrq->post_wqes(xskrq);
+		busy_xsk |= mlx5e_napi_xsk_post(xsksq, xskrq);
 	}
 
 	busy |= busy_xsk;