dpdk: fix gcc 10 maybe-uninitialized warning

Backport upstream fix of Kevin Traynor <ktraynor@redhat.com>:
    afd2924 examples/ipsec-gw: fix gcc 10 maybe-uninitialized warning

With that fix applied, dpdk builds fine with recent poky.

Signed-off-by: Jens Rehsack <sno@netbsd.org>

2 files changed, 54 insertions, 0 deletions

diff --git a/recipes-extended/dpdk/dpdk/0001-examples-ipsec-gw-fix-gcc-10-maybe-uninitialized-war.patch b/recipes-extended/dpdk/dpdk/0001-examples-ipsec-gw-fix-gcc-10-maybe-uninitialized-war.patch
new file mode 100644
index 00000000..3b5a2b3a
--- /dev/null
+++ b/recipes-extended/dpdk/dpdk/0001-examples-ipsec-gw-fix-gcc-10-maybe-uninitialized-war.patch
@@ -0,0 +1,53 @@
+From 6fe3e96ab6e92f8faca9784a46bc33d92790c2b8 Mon Sep 17 00:00:00 2001
+From: Kevin Traynor <ktraynor@redhat.com>
+Date: Wed, 11 Mar 2020 11:33:00 +0000
+Subject: [PATCH] examples/ipsec-gw: fix gcc 10 maybe-uninitialized warning
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+gcc 10.0.1 reports:
+
+../examples/ipsec-secgw/ipsec_process.c: In function ‘ipsec_process’:
+../examples/ipsec-secgw/ipsec_process.c:132:34:
+error: ‘grp.m’ may be used uninitialized in this function
+ [-Werror=maybe-uninitialized]
+  132 |    grp[n].cnt = pkts + i - grp[n].m;
+      |                            ~~~~~~^~
+
+This is a correct warning for the initial execution of the statement.
+However, it is the design of the loop that grp[0].cnt will later be
+written with the correct value using an initialized grp[0].m before it
+is used.
+
+In order to remove the warning, initialize grp[0].m for the initial and
+unused calculation of grp[0].cnt.
+
+Fixes: 3e5f4625dc17 ("examples/ipsec-secgw: make data-path to use IPsec library")
+Cc: stable@dpdk.org
+
+Upstream-Status: Backport
+
+Suggested-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
+Signed-off-by: Kevin Traynor <ktraynor@redhat.com>
+Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
+Signed-off-by: Jens Rehsack <jens.rehsack.ext@safrangroup.com>
+---
+ examples/ipsec-secgw/ipsec_process.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/examples/ipsec-secgw/ipsec_process.c b/examples/ipsec-secgw/ipsec_process.c
+index 2eb5c8b34..37f406d46 100644
+--- a/examples/ipsec-secgw/ipsec_process.c
++++ b/examples/ipsec-secgw/ipsec_process.c
+@@ -125,6 +125,7 @@ sa_group(void *sa_ptr[], struct rte_mbuf *pkts[],
+        void * const nosa = &spi;
+ 
+        sa = nosa;
++       grp[0].m = pkts;
+        for (i = 0, n = 0; i != num; i++) {
+ 
+                if (sa != sa_ptr[i]) {
+-- 
+2.17.1
+
diff --git a/recipes-extended/dpdk/dpdk_19.11-20.04.bb b/recipes-extended/dpdk/dpdk_19.11-20.04.bb
index 12b6d56e..398d2ec4 100644
--- a/recipes-extended/dpdk/dpdk_19.11-20.04.bb
+++ b/recipes-extended/dpdk/dpdk_19.11-20.04.bb
@@ -5,6 +5,7 @@ SRC_URI = "git://source.codeaurora.org/external/qoriq/qoriq-components/dpdk;nobr
            file://0001-add-Wno-cast-function-type.patch \
            file://0001-Add-RTE_KERNELDIR_OUT.patch \
            file://0004-update-WERROR_FLAGS.patch \
+           file://0001-examples-ipsec-gw-fix-gcc-10-maybe-uninitialized-war.patch \
 "
 SRCREV = "4110a5fed09fa034963cfc246a6285911ecbd540"