layerscape: add patches-5.4

[openwrt/staging/wigyori.git] / target / linux / layerscape / patches-5.4 / 809-jailhouse-0002-ivshmem-net-Map-shmem-region-as-RAM.patch

diff --git a/target/linux/layerscape/patches-5.4/809-jailhouse-0002-ivshmem-net-Map-shmem-region-as-RAM.patch b/target/linux/layerscape/patches-5.4/809-jailhouse-0002-ivshmem-net-Map-shmem-region-as-RAM.patch
new file mode 100644 (file)
index 0000000..8a3bcd6
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/809-jailhouse-0002-ivshmem-net-Map-shmem-region-as-RAM.patch
@@ -0,0 +1,26 @@
+From 4677dd55d55832dab1e4f41fe9a7fabe8bb95197 Mon Sep 17 00:00:00 2001
+From: Jan Kiszka <jan.kiszka@siemens.com>
+Date: Thu, 24 Nov 2016 08:27:45 +0100
+Subject: [PATCH] ivshmem-net: Map shmem region as RAM
+
+No need for special caching, simply map the shared memory region like
+RAM, thus write-back. This gives us another order of magnitude in
+throughput.
+
+Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
+(cherry picked from commit af59c6541a65622cab498851e01653dd378cd9f8)
+---
+ drivers/net/ivshmem-net.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/net/ivshmem-net.c
++++ b/drivers/net/ivshmem-net.c
+@@ -802,7 +802,7 @@ static int ivshm_net_probe(struct pci_de
+       if (!devm_request_mem_region(&pdev->dev, shmaddr, shmlen, DRV_NAME))
+               return -EBUSY;
+ 
+-      shm = devm_memremap(&pdev->dev, shmaddr, shmlen, MEMREMAP_WC);
++      shm = devm_memremap(&pdev->dev, shmaddr, shmlen, MEMREMAP_WB);
+       if (!shm)
+               return -ENOMEM;
+