[RFC] ethdev: convert string initialization

[Ferruh Yigit <ferruh.yigit@amd.com>]

gcc 15 experimental [1], with -Wextra flag, gives warning in variable
initialization as string [2].

The warning has a point when initialized variable is intended to use as
string, since assignment is missing the required null terminator for
this case. But warning is useless for our usecase.

I don't know if this behaviour will change in gcc15, as it is still
under development. But if not we may need to update our initialization.

In this patch only updated a few instance to show the issue, there are
many instances to fix, if we prefer to go this way.
Other option is to disable warning but it can be useful for actual
string usecases, so I prefer to keep it.

[1]
gcc (GCC) 15.0.0 20240801 (experimental)

[2]
../lib/ethdev/rte_flow.h:906:36:
  error: initializer-string for array of ‘unsigned char’ is too long
        [-Werror=unterminated-string-initialization]
906 |         .hdr.dst_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
    |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~

../lib/ethdev/rte_flow.h:907:36:
  error: initializer-string for array of ‘unsigned char’ is too long
         [-Werror=unterminated-string-initialization]
907 |         .hdr.src_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
    |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~

../lib/ethdev/rte_flow.h:1009:25:
  error: initializer-string for array of ‘unsigned char’ is too long
         [-Werror=unterminated-string-initialization]
1009 |                         "\xff\xff\xff\xff\xff\xff\xff\xff"
     |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../lib/ethdev/rte_flow.h:1012:25:
  error: initializer-string for array of ‘unsigned char’ is too long
         [-Werror=unterminated-string-initialization]
1012 |                         "\xff\xff\xff\xff\xff\xff\xff\xff"
     |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../lib/ethdev/rte_flow.h:1135:20:
  error: initializer-string for array of ‘unsigned char’ is too long
         [-Werror=unterminated-string-initialization]
1135 |         .hdr.vni = "\xff\xff\xff",
     |                    ^~~~~~~~~~~~~~

Signed-off-by: Ferruh Yigit <ferruh.yigit@amd.com>
---
 lib/ethdev/rte_flow.h | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h
index f864578f806b..8b623974cd44 100644
--- a/lib/ethdev/rte_flow.h
+++ b/lib/ethdev/rte_flow.h
@@ -903,8 +903,8 @@ struct rte_flow_item_eth {
 /** Default mask for RTE_FLOW_ITEM_TYPE_ETH. */
 #ifndef __cplusplus
 static const struct rte_flow_item_eth rte_flow_item_eth_mask = {
-	.hdr.dst_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
-	.hdr.src_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
+	.hdr.dst_addr.addr_bytes = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
+	.hdr.src_addr.addr_bytes = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
 	.hdr.ether_type = RTE_BE16(0x0000),
 };
 #endif
@@ -1005,12 +1005,10 @@ struct rte_flow_item_ipv6 {
 #ifndef __cplusplus
 static const struct rte_flow_item_ipv6 rte_flow_item_ipv6_mask = {
 	.hdr = {
-		.src_addr =
-			"\xff\xff\xff\xff\xff\xff\xff\xff"
-			"\xff\xff\xff\xff\xff\xff\xff\xff",
-		.dst_addr =
-			"\xff\xff\xff\xff\xff\xff\xff\xff"
-			"\xff\xff\xff\xff\xff\xff\xff\xff",
+		.src_addr = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+			      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
+		.dst_addr = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+			      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
 	},
 };
 #endif
@@ -1132,7 +1130,7 @@ struct rte_flow_item_vxlan {
 /** Default mask for RTE_FLOW_ITEM_TYPE_VXLAN. */
 #ifndef __cplusplus
 static const struct rte_flow_item_vxlan rte_flow_item_vxlan_mask = {
-	.hdr.vni = "\xff\xff\xff",
+	.hdr.vni = { 0xff, 0xff, 0xff },
 };
 #endif
 
-- 
2.43.0