[dpdk-dev] [PATCH v2 3/3] kni: set initial value for MTU

[Hemant Agrawal <hemant.agrawal@nxp.com>]

Configure initial application provided  mtu on the KNI interface.

Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
---
v2: fix ABI breakage

 examples/kni/main.c                                           | 2 ++
 lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h | 1 +
 lib/librte_eal/linuxapp/kni/kni_misc.c                        | 3 +++
 lib/librte_kni/rte_kni.c                                      | 1 +
 lib/librte_kni/rte_kni.h                                      | 1 +
 5 files changed, 8 insertions(+)

diff --git a/examples/kni/main.c b/examples/kni/main.c
index 1c251c2..d9c9fa5 100644
--- a/examples/kni/main.c
+++ b/examples/kni/main.c
@@ -845,6 +845,8 @@ kni_alloc(uint16_t port_id)
 			rte_eth_macaddr_get(port_id,
 					(struct ether_addr *)&conf.mac_addr);
 
+			rte_eth_dev_get_mtu(port_id, &conf.mtu);
+
 			memset(&ops, 0, sizeof(ops));
 			ops.port_id = port_id;
 			ops.change_mtu = kni_change_mtu;
diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
index b519db5..2e393c0 100644
--- a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
+++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
@@ -172,6 +172,7 @@ struct rte_kni_device_info {
 
 	/* mbuf size */
 	unsigned mbuf_size;
+	unsigned int mtu;
 	char mac_addr[6];
 };
 
diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
index b524d30..0ccd227 100644
--- a/lib/librte_eal/linuxapp/kni/kni_misc.c
+++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
@@ -470,6 +470,9 @@ kni_ioctl_create(struct net *net, uint32_t ioctl_num,
 			random_ether_addr(net_dev->dev_addr);
 	}
 
+	if (dev_info.mtu)
+		net_dev->mtu = dev_info.mtu;
+
 	ret = register_netdev(net_dev);
 	if (ret) {
 		pr_err("error %i registering device \"%s\"\n",
diff --git a/lib/librte_kni/rte_kni.c b/lib/librte_kni/rte_kni.c
index bed3f20..2461b47 100644
--- a/lib/librte_kni/rte_kni.c
+++ b/lib/librte_kni/rte_kni.c
@@ -369,6 +369,7 @@ rte_kni_alloc(struct rte_mempool *pktmbuf_pool,
 	dev_info.force_bind = conf->force_bind;
 	dev_info.group_id = conf->group_id;
 	dev_info.mbuf_size = conf->mbuf_size;
+	dev_info.mtu = conf->mtu;
 
 	memcpy(dev_info.mac_addr, conf->mac_addr, ETHER_ADDR_LEN);
 
diff --git a/lib/librte_kni/rte_kni.h b/lib/librte_kni/rte_kni.h
index 4530bdd..cbf3188 100644
--- a/lib/librte_kni/rte_kni.h
+++ b/lib/librte_kni/rte_kni.h
@@ -98,6 +98,7 @@ struct rte_kni_conf {
 	__extension__
 	uint8_t force_bind : 1; /* Flag to bind kernel thread */
 	char mac_addr[ETHER_ADDR_LEN]; /* MAC address assigned to KNI */
+	uint16_t mtu;
 };
 
 /**
-- 
2.7.4