gve: Fix GFP flags when allocing pages

[ Upstream commit a92f7a6feeb3884c69c1c7c1f13bccecb2228ad0 ]

Use GFP_ATOMIC when allocating pages out of the hotpath,
continue to use GFP_KERNEL when allocating pages during setup.

GFP_KERNEL will allow blocking which allows it to succeed
more often in a low memory enviornment but in the hotpath we do
not want to allow the allocation to block.

Fixes: f5cedc84a30d2 ("gve: Add transmit and receive support")
Signed-off-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David Awogbemila <awogbemila@google.com>
Link: https://lore.kernel.org/r/20220126003843.3584521-1-awogbemila@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/google/gve/gve_rx_dqo.c b/drivers/net/ethernet/google/gve/gve_rx_dqo.c
index 7b18b4fd9e54885ea170cbf4095ffaaa1a3a4b3b..d947c2c33412869983bf6d38dd3bed41908aef5e 100644 (file)
--- a/drivers/net/ethernet/google/gve/gve_rx_dqo.c
+++ b/drivers/net/ethernet/google/gve/gve_rx_dqo.c
@@ -157,7 +157,7 @@ static int gve_alloc_page_dqo(struct gve_priv *priv,
        int err;
 
        err = gve_alloc_page(priv, &priv->pdev->dev, &buf_state->page_info.page,
-                            &buf_state->addr, DMA_FROM_DEVICE, GFP_KERNEL);
+                            &buf_state->addr, DMA_FROM_DEVICE, GFP_ATOMIC);
        if (err)
                return err;