[PATCH for-next] RDMA/efa: Use __GFP_RETRY_MAYFAIL for ring allocations

[Michael Margolin <mrgolin@amazon.com>]

RQ and CQ ring buffers require physically contiguous memory. On
systems under memory pressure, high-order allocations can fail
even when sufficient free memory exists because the allocator
gives up after a single reclaim and compaction attempt for
costly-order requests that lack __GFP_RETRY_MAYFAIL.

Add __GFP_RETRY_MAYFAIL to the GFP flags in efa_zalloc_mapped()
to allow retries with escalating compaction priority and release
of highatomic reserves before giving up.

Reviewed-by: Firas Jahjah <firasj@amazon.com>
Reviewed-by: Yonatan Nachum <ynachum@amazon.com>
Signed-off-by: Michael Margolin <mrgolin@amazon.com>
---
 drivers/infiniband/hw/efa/efa_verbs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c
index 2d28d68efe77..0b0396e190f2 100644
--- a/drivers/infiniband/hw/efa/efa_verbs.c
+++ b/drivers/infiniband/hw/efa/efa_verbs.c
@@ -190,7 +190,7 @@ static void *efa_zalloc_mapped(struct efa_dev *dev, dma_addr_t *dma_addr,
 {
 	void *addr;
 
-	addr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
+	addr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO | __GFP_RETRY_MAYFAIL);
 	if (!addr)
 		return NULL;
 
-- 
2.47.3