mlx4: handle non-napi callers to napi_poll

[ Upstream commit b2b8a92733b288128feb57ffa694758cf475106c ]

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index c6d101351537a890ef1f5f613a26bfaecd753fda..bb0063e851c343866dfe152f59aa4c71bb583adc 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -948,6 +948,9 @@ 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 8a32a8f7f9c0c7316665294b5342051b46f8b623..777e22d42c0f011ab7f93590df650b517e289d2d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -343,7 +343,7 @@ 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);