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net/smc: Fix lookup of netdev by using ib_device_get_netdev() 

JIRA: https://issues.redhat.com/browse/RHEL-102713

commit de88df01796b309903b70888fbdf2b89607e3a6a
Author: Wenjia Zhang <wenjia@linux.ibm.com>
Date:   Wed Nov 6 09:26:12 2024 +0100

    net/smc: Fix lookup of netdev by using ib_device_get_netdev()

    The SMC-R variant of the SMC protocol used direct call to function
    ib_device_ops.get_netdev() to lookup netdev. As we used mlx5 device
    driver to run SMC-R, it failed to find a device, because in mlx5_ib the
    internal net device management for retrieving net devices was replaced
    by a common interface ib_device_get_netdev() in commit 8d159eb2117b
    ("RDMA/mlx5: Use IB set_netdev and get_netdev functions").

    Since such direct accesses to the internal net device management is not
    recommended at all, update the SMC-R code to use proper API
    ib_device_get_netdev().

    Fixes: 54903572c2 ("net/smc: allow pnetid-less configuration")
    Reported-by: Aswin K <aswin@linux.ibm.com>
    Reviewed-by: Gerd Bayer <gbayer@linux.ibm.com>
    Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
    Reviewed-by: Wen Gu <guwen@linux.alibaba.com>
    Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
    Reviewed-by: D. Wythe <alibuda@linux.alibaba.com>
    Signed-off-by: Wenjia Zhang <wenjia@linux.ibm.com>
    Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
    Link: https://patch.msgid.link/20241106082612.57803-1-wenjia@linux.ibm.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Hidayath Khan <hidayath@linux.ibm.com>
Signed-off-by: Mete Durlu <mdurlu@redhat.com>
This commit is contained in:
Mete Durlu 2025-07-25 16:40:59 +02:00
parent 2c415ade52
commit 4f0ce3d768
2 changed files with 3 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/smc/smc_ib.c
View File

@ -899,9 +899,7 @@ static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
struct ib_device *ibdev = smcibdev->ibdev;
struct net_device *ndev;
if (!ibdev->ops.get_netdev)
return;
ndev = ibdev->ops.get_netdev(ibdev, port + 1);
ndev = ib_device_get_netdev(ibdev, port + 1);
if (ndev) {
smcibdev->ndev_ifidx[port] = ndev->ifindex;
dev_put(ndev);
@ -921,9 +919,7 @@ void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
port_cnt = smcibdev->ibdev->phys_port_cnt;
for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
libdev = smcibdev->ibdev;
if (!libdev->ops.get_netdev)
continue;
lndev = libdev->ops.get_netdev(libdev, i + 1);
lndev = ib_device_get_netdev(libdev, i + 1);
dev_put(lndev);
if (lndev != ndev)
continue;

4
net/smc/smc_pnet.c
View File

@ -1057,9 +1057,7 @@ static void smc_pnet_find_rdma_dev(struct net_device *netdev,
for (i = 1; i <= SMC_MAX_PORTS; i++) {
if (!rdma_is_port_valid(ibdev->ibdev, i))
continue;
if (!ibdev->ibdev->ops.get_netdev)
continue;
ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
ndev = ib_device_get_netdev(ibdev->ibdev, i);
if (!ndev)
continue;
dev_put(ndev);