From c8e22fea6a15d7376057bd33c6321b31f3432448 Mon Sep 17 00:00:00 2001
From: Jonathan Lemon <bsd@fb.com>
Date: Thu, 8 Oct 2020 11:45:26 -0700
Subject: [PATCH] mlx4: handle non-napi callers to napi_poll
Git-commit: b2b8a92733b288128feb57ffa694758cf475106c
Patch-mainline: v5.10-rc1
References: git-fixes
netcons calls napi_poll with a budget of 0 to transmit packets.
Handle this by:
- skipping RX processing
- do not try to recycle TX packets to the RX cache
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/ethernet/mellanox/mlx4/en_rx.c | 3 +++
drivers/net/ethernet/mellanox/mlx4/en_tx.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 454eb42ce06a..3f4ec8c22ad2 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -945,6 +945,9 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
bool clean_complete = true;
int done;
+ if (!budget)
+ return 0;
+
if (priv->tx_ring_num[TX_XDP]) {
xdp_tx_cq = priv->tx_cq[TX_XDP][cq->ring];
if (xdp_tx_cq->xdp_busy) {
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 0b5ef4d4ceef..b27a7c826fdf 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -353,7 +353,7 @@ u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv,
.dma = tx_info->map0_dma,
};
- if (!mlx4_en_rx_recycle(ring->recycle_ring, &frame)) {
+ if (!napi_mode || !mlx4_en_rx_recycle(ring->recycle_ring, &frame)) {
dma_unmap_page(priv->ddev, tx_info->map0_dma,
PAGE_SIZE, priv->dma_dir);
put_page(tx_info->page);
--
2.16.4