RDMA/cxgb4: Fix RDMA_CM_EVENT_UNREACHABLE error for iWARP

Kamal Heibrequested to merge
kheib/centos-stream-9:9.6-75825 into main

JIRA: https://issues.redhat.com/browse/RHEL-75825

commit c659b405b82ead335bee6eb33f9691bf718e21e8
Author: Anumula Murali Mohan Reddy anumula@chelsio.com
Date: Mon Oct 7 18:53:11 2024 +0530

RDMA/cxgb4: Fix RDMA_CM_EVENT_UNREACHABLE error for iWARP  

ip_dev_find() always returns real net_device address, whether traffic is  
running on a vlan or real device, if traffic is over vlan, filling  
endpoint struture with real ndev and an attempt to send a connect request  
will results in RDMA_CM_EVENT_UNREACHABLE error.  This patch fixes the  
issue by using vlan_dev_real_dev().  

Fixes: 830662f6f032 ("RDMA/cxgb4: Add support for active and passive open connection with IPv6 address")  
Link: https://patch.msgid.link/r/20241007132311.70593-1-anumula@chelsio.com  
Signed-off-by: Anumula Murali Mohan Reddy <anumula@chelsio.com>  
Signed-off-by: Potnuri Bharat Teja <bharat@chelsio.com>  
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Signed-off-by: Kamal Heib kheib@redhat.com

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