Re: [PATCH 1/4] RDMA/core: Squash a single user static function

[Leon Romanovsky <leon@kernel.org>]

On Sun, Sep 07, 2025 at 07:08:30PM +0300, Edward Srouji wrote:
> From: Parav Pandit <parav@nvidia.com>
> 
> In order to reduce dependencies in IFF_LOOPBACK in
> route and neighbour resolution steps, squash the
> static function to its single caller and simplify the
> code. No functional change.

It needs more explanation why it is true. Before this change,
we set dev_addr->network to some value and returned error.
That error propagated upto process_one_req(), which handles only
some errors and ignores rest.

So now, we continue to handle REQ without proper req->addr->network.

Thanks

> 
> Signed-off-by: Parav Pandit <parav@nvidia.com>
> Reviewed-by: Vlad Dumitrescu <vdumitrescu@nvidia.com>
> Signed-off-by: Edward Srouji <edwards@nvidia.com>
> ---
>  drivers/infiniband/core/addr.c | 49 ++++++++++++++--------------------
>  1 file changed, 20 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
> index be0743dac3ff..594e7ee335f7 100644
> --- a/drivers/infiniband/core/addr.c
> +++ b/drivers/infiniband/core/addr.c
> @@ -465,34 +465,6 @@ static int addr_resolve_neigh(const struct dst_entry *dst,
>  	return ret;
>  }
>  
> -static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
> -			    const struct sockaddr *dst_in,
> -			    const struct dst_entry *dst,
> -			    const struct net_device *ndev)
> -{
> -	int ret = 0;
> -
> -	if (dst->dev->flags & IFF_LOOPBACK)
> -		ret = rdma_translate_ip(dst_in, dev_addr);
> -	else
> -		rdma_copy_src_l2_addr(dev_addr, dst->dev);
> -
> -	/*
> -	 * If there's a gateway and type of device not ARPHRD_INFINIBAND,
> -	 * we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the
> -	 * network type accordingly.
> -	 */
> -	if (has_gateway(dst, dst_in->sa_family) &&
> -	    ndev->type != ARPHRD_INFINIBAND)
> -		dev_addr->network = dst_in->sa_family == AF_INET ?
> -						RDMA_NETWORK_IPV4 :
> -						RDMA_NETWORK_IPV6;
> -	else
> -		dev_addr->network = RDMA_NETWORK_IB;
> -
> -	return ret;
> -}
> -
>  static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
>  				 unsigned int *ndev_flags,
>  				 const struct sockaddr *dst_in,
> @@ -503,6 +475,7 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
>  	*ndev_flags = ndev->flags;
>  	/* A physical device must be the RDMA device to use */
>  	if (ndev->flags & IFF_LOOPBACK) {
> +		int ret;
>  		/*
>  		 * RDMA (IB/RoCE, iWarp) doesn't run on lo interface or
>  		 * loopback IP address. So if route is resolved to loopback
> @@ -512,9 +485,27 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
>  		ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
>  		if (IS_ERR(ndev))
>  			return -ENODEV;
> +		ret = rdma_translate_ip(dst_in, dev_addr);
> +		if (ret)
> +			return ret;
> +	} else {
> +		rdma_copy_src_l2_addr(dev_addr, dst->dev);
>  	}
>  
> -	return copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
> +	/*
> +	 * If there's a gateway and type of device not ARPHRD_INFINIBAND,
> +	 * we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the
> +	 * network type accordingly.
> +	 */
> +	if (has_gateway(dst, dst_in->sa_family) &&
> +	    ndev->type != ARPHRD_INFINIBAND)
> +		dev_addr->network = dst_in->sa_family == AF_INET ?
> +						RDMA_NETWORK_IPV4 :
> +						RDMA_NETWORK_IPV6;
> +	else
> +		dev_addr->network = RDMA_NETWORK_IB;
> +
> +	return 0;
>  }
>  
>  static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
> -- 
> 2.21.3
> 
>