From: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Date: Thu, 8 Aug 2019 12:38:03 +0300
Subject: xdp: xdp_umem: fix umem pages mapping for 32bits systems
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Patch-mainline: v5.4-rc1
Git-commit: d9973cec9d578b381235bb872a2d378c69c54915
References: bsc#1154353
Use kmap instead of page_address as it's not always in low memory.
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/xdp/xdp_umem.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -14,6 +14,7 @@
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/idr.h>
+#include <linux/highmem.h>
#include "xdp_umem.h"
#include "xsk_queue.h"
@@ -164,6 +165,14 @@ void xdp_umem_clear_dev(struct xdp_umem
umem->zc = false;
}
+static void xdp_umem_unmap_pages(struct xdp_umem *umem)
+{
+ unsigned int i;
+
+ for (i = 0; i < umem->npgs; i++)
+ kunmap(umem->pgs[i]);
+}
+
static void xdp_umem_unpin_pages(struct xdp_umem *umem)
{
unsigned int i;
@@ -207,6 +216,7 @@ static void xdp_umem_release(struct xdp_
xsk_reuseq_destroy(umem);
+ xdp_umem_unmap_pages(umem);
xdp_umem_unpin_pages(umem);
kfree(umem->pages);
@@ -369,7 +379,7 @@ static int xdp_umem_reg(struct xdp_umem
}
for (i = 0; i < umem->npgs; i++)
- umem->pages[i].addr = page_address(umem->pgs[i]);
+ umem->pages[i].addr = kmap(umem->pgs[i]);
return 0;