[PATCH bpf-next 2/3] xdp: xdp_umem: replace kmap on vmap for umem map

[Ivan Khoronzhuk]

For 64-bit there is no reason to use vmap/vunmap, so use page_address
as it was initially. For 32 bits, in some apps, like in samples
xdpsock_user.c when number of pgs in use is quite big, the kmap
memory can be not enough, despite on this, kmap looks like is
deprecated in such cases as it can block and should be used rather
for dynamic mm.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@xxxxxxxxxx>
---
 net/xdp/xdp_umem.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index a0607969f8c0..907c9019fe21 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -14,7 +14,7 @@
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/idr.h>
-#include <linux/highmem.h>
+#include <linux/vmalloc.h>
 
 #include "xdp_umem.h"
 #include "xsk_queue.h"
@@ -167,10 +167,12 @@ void xdp_umem_clear_dev(struct xdp_umem *umem)
 
 static void xdp_umem_unmap_pages(struct xdp_umem *umem)
 {
+#if BITS_PER_LONG == 32
 	unsigned int i;
 
 	for (i = 0; i < umem->npgs; i++)
-		kunmap(umem->pgs[i]);
+		vunmap(umem->pages[i].addr);
+#endif
 }
 
 static void xdp_umem_unpin_pages(struct xdp_umem *umem)
@@ -378,8 +380,14 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
 		goto out_account;
 	}
 
-	for (i = 0; i < umem->npgs; i++)
-		umem->pages[i].addr = kmap(umem->pgs[i]);
+	for (i = 0; i < umem->npgs; i++) {
+#if BITS_PER_LONG == 32
+		umem->pages[i].addr = vmap(&umem->pgs[i], 1, VM_MAP,
+					   PAGE_KERNEL);
+#else
+		umem->pages[i].addr = page_address(umem->pgs[i]);
+#endif
+	}
 
 	return 0;
 
-- 
2.17.1