gve: Fix GFP flags when allocing pages

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>

diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h
index 5f5d4f7..1607354 100644 (file)
--- a/drivers/net/ethernet/google/gve/gve.h
+++ b/drivers/net/ethernet/google/gve/gve.h
@@ -843,7 +843,7 @@ static inline bool gve_is_gqi(struct gve_priv *priv)
 /* buffers */
 int gve_alloc_page(struct gve_priv *priv, struct device *dev,
                   struct page **page, dma_addr_t *dma,
-                  enum dma_data_direction);
+                  enum dma_data_direction, gfp_t gfp_flags);
 void gve_free_page(struct device *dev, struct page *page, dma_addr_t dma,
                   enum dma_data_direction);
 /* tx handling */

diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index f7f65c4..54e51c8 100644 (file)
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -766,9 +766,9 @@ static void gve_free_rings(struct gve_priv *priv)
 
 int gve_alloc_page(struct gve_priv *priv, struct device *dev,
                   struct page **page, dma_addr_t *dma,
-                  enum dma_data_direction dir)
+                  enum dma_data_direction dir, gfp_t gfp_flags)
 {
-       *page = alloc_page(GFP_KERNEL);
+       *page = alloc_page(gfp_flags);
        if (!*page) {
                priv->page_alloc_fail++;
                return -ENOMEM;
@@ -811,7 +811,7 @@ static int gve_alloc_queue_page_list(struct gve_priv *priv, u32 id,
        for (i = 0; i < pages; i++) {
                err = gve_alloc_page(priv, &priv->pdev->dev, &qpl->pages[i],
                                     &qpl->page_buses[i],
-                                    gve_qpl_dma_dir(priv, id));
+                                    gve_qpl_dma_dir(priv, id), GFP_KERNEL);
                /* caller handles clean up */
                if (err)
                        return -ENOMEM;

diff --git a/drivers/net/ethernet/google/gve/gve_rx.c b/drivers/net/ethernet/google/gve/gve_rx.c
index 9ddcc49..2068199 100644 (file)
--- a/drivers/net/ethernet/google/gve/gve_rx.c
+++ b/drivers/net/ethernet/google/gve/gve_rx.c
@@ -86,7 +86,8 @@ static int gve_rx_alloc_buffer(struct gve_priv *priv, struct device *dev,
        dma_addr_t dma;
        int err;
 
-       err = gve_alloc_page(priv, dev, &page, &dma, DMA_FROM_DEVICE);
+       err = gve_alloc_page(priv, dev, &page, &dma, DMA_FROM_DEVICE,
+                            GFP_ATOMIC);
        if (err)
                return err;
 

diff --git a/drivers/net/ethernet/google/gve/gve_rx_dqo.c b/drivers/net/ethernet/google/gve/gve_rx_dqo.c
index beb8bb0..8c93962 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);
+                            &buf_state->addr, DMA_FROM_DEVICE, GFP_KERNEL);
        if (err)
                return err;