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-rw-r--r--build/external/patches/dpdk_20.08/0001-net-virtio-fix-variable-assignment-in-helper-macro.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/build/external/patches/dpdk_20.08/0001-net-virtio-fix-variable-assignment-in-helper-macro.patch b/build/external/patches/dpdk_20.08/0001-net-virtio-fix-variable-assignment-in-helper-macro.patch
new file mode 100644
index 00000000000..a4c00b9f9b1
--- /dev/null
+++ b/build/external/patches/dpdk_20.08/0001-net-virtio-fix-variable-assignment-in-helper-macro.patch
@@ -0,0 +1,42 @@
+From a1412e05caa2678757156d4de2755ab5140ecc24 Mon Sep 17 00:00:00 2001
+From: Vipul Ashri <vipul.ashri@oracle.com>
+Date: Fri, 18 Sep 2020 15:25:04 +0530
+Subject: [PATCH] net/virtio: fix variable assignment in helper macro
+
+Inside Macro ASSIGN_UNLESS_EQUAL(var, val), assignment to var is always
+failing as assignment done using var_ having local scope only.
+This leads to TX packets not going out and found broken due to cleanup
+malfunctioning. This patch fixes the wrong variable assignment.
+
+Fixes: 57f90f894588 ("net/virtio: reuse packed ring functions")
+Cc: stable@dpdk.org
+
+Signed-off-by: Vipul Ashri <vipul.ashri@oracle.com>
+Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
+Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
+---
+ drivers/net/virtio/virtqueue.h | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
+index 105a9c00c..6ed50648c 100644
+--- a/drivers/net/virtio/virtqueue.h
++++ b/drivers/net/virtio/virtqueue.h
+@@ -607,10 +607,10 @@ virtqueue_notify(struct virtqueue *vq)
+
+ /* avoid write operation when necessary, to lessen cache issues */
+ #define ASSIGN_UNLESS_EQUAL(var, val) do { \
+- typeof(var) var_ = (var); \
+- typeof(val) val_ = (val); \
+- if ((var_) != (val_)) \
+- (var_) = (val_); \
++ typeof(var) *const var_ = &(var); \
++ typeof(val) const val_ = (val); \
++ if (*var_ != val_) \
++ *var_ = val_; \
+ } while (0)
+
+ #define virtqueue_clear_net_hdr(hdr) do { \
+--
+2.18.4
+