mlxsw: pci: Allocate skbs using GFP_KERNEL during initialization

The driver allocates skbs during initialization and during Rx
processing. Take advantage of the fact that the former happens in
process context and allocate the skbs using GFP_KERNEL to decrease the
probability of allocation failure.

Tested with CONFIG_DEBUG_ATOMIC_SLEEP=y.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/dfa6ed0926e045fe7c14f0894cc0c37fee81bf9d.1697034729.git.petrm@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/pci.c

@@ -352,14 +352,15 @@ static void mlxsw_pci_wqe_frag_unmap(struct mlxsw_pci *mlxsw_pci, char *wqe,
 }
 
 static int mlxsw_pci_rdq_skb_alloc(struct mlxsw_pci *mlxsw_pci,
-				   struct mlxsw_pci_queue_elem_info *elem_info)
+				   struct mlxsw_pci_queue_elem_info *elem_info,
+				   gfp_t gfp)
 {
 	size_t buf_len = MLXSW_PORT_MAX_MTU;
 	char *wqe = elem_info->elem;
 	struct sk_buff *skb;
 	int err;
 
-	skb = netdev_alloc_skb_ip_align(NULL, buf_len);
+	skb = __netdev_alloc_skb_ip_align(NULL, buf_len, gfp);
 	if (!skb)
 		return -ENOMEM;
 
@@ -420,7 +421,7 @@ static int mlxsw_pci_rdq_init(struct mlxsw_pci *mlxsw_pci, char *mbox,
 	for (i = 0; i < q->count; i++) {
 		elem_info = mlxsw_pci_queue_elem_info_producer_get(q);
 		BUG_ON(!elem_info);
-		err = mlxsw_pci_rdq_skb_alloc(mlxsw_pci, elem_info);
+		err = mlxsw_pci_rdq_skb_alloc(mlxsw_pci, elem_info, GFP_KERNEL);
 		if (err)
 			goto rollback;
 		/* Everything is set up, ring doorbell to pass elem to HW */
@@ -640,7 +641,7 @@ static void mlxsw_pci_cqe_rdq_handle(struct mlxsw_pci *mlxsw_pci,
 	if (q->consumer_counter++ != consumer_counter_limit)
 		dev_dbg_ratelimited(&pdev->dev, "Consumer counter does not match limit in RDQ\n");
 
-	err = mlxsw_pci_rdq_skb_alloc(mlxsw_pci, elem_info);
+	err = mlxsw_pci_rdq_skb_alloc(mlxsw_pci, elem_info, GFP_ATOMIC);
 	if (err) {
 		dev_err_ratelimited(&pdev->dev, "Failed to alloc skb for RDQ\n");
 		goto out;