Add mtu patch reversal

Author: byteocean

Dockerfile

@@ -58,6 +58,7 @@ ENV DPDK_DIR=/workspace/dpdk-${DPDK_VER}
 COPY hack/*.patch hack/
 
 RUN cd $DPDK_DIR \
+&& patch -p1 -R < ../hack/dpdk_25_11_mtu.patch \
 && patch -p1 < ../hack/dpdk_25_11_fdb_def_rule.patch \
 && patch -p1 < ../hack/dpdk_25_11_log.patch \
 && patch -p1 < ../hack/dpdk_25_11_telemetry_key.patch \

hack/dpdk_25_11_mtu.patch

@@ -0,0 +1,46 @@
+This is the original patch from upstream DPDK.
+Dpservice needs to revert it for MTU to stay untouched.
+Reason being that dpservice actually only handles custom underlay traffic,
+that uses MTU 1500+overhead and not the full 9100 MTU setup on a node.
+Using this patch forces dpservice to support MTU 9100,
+which increases memory footprint significantly.
+---
+
+From 4032e7572a85005127d65ded4460ddbbfcf780f9 Mon Sep 17 00:00:00 2001
+From: Dariusz Sosnowski <[email protected]>
+Date: Mon, 8 Jul 2024 12:59:31 +0200
+Subject: [PATCH] net/mlx5: fix MTU configuration
+
+[ upstream commit 10859ecf09c424c0f6a89379f0326a0c51f9cd2f ]
+
+Apply provided MTU, derived from rte_eth_conf.rxmode.mtu,
+on port configuration.
+
+Bugzilla ID: 1483
+Fixes: e60fbd5b24fc ("mlx5: add device configure/start/stop")
+
+Signed-off-by: Dariusz Sosnowski <[email protected]>
+Acked-by: Viacheslav Ovsiienko <[email protected]>
+---
+ drivers/net/mlx5/mlx5_ethdev.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
+index 9c44471c42..c6ec156493 100644
+--- a/drivers/net/mlx5/mlx5_ethdev.c
++++ b/drivers/net/mlx5/mlx5_ethdev.c
+@@ -136,6 +136,12 @@ mlx5_dev_configure(struct rte_eth_dev *dev)
+ 	ret = mlx5_proc_priv_init(dev);
+ 	if (ret)
+ 		return ret;
++	ret = mlx5_dev_set_mtu(dev, dev->data->mtu);
++	if (ret) {
++		DRV_LOG(ERR, "port %u failed to set MTU to %u", dev->data->port_id,
++			dev->data->mtu);
++		return ret;
++	}
+ 	return 0;
+ }
+ 
+-- 
+2.39.2