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rpcrdma: fix handling for RDMA_CM_EVENT_DEVICE_REMOVAL

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Under the scenario of IB device bonding, when bringing down one of the
ports, or all ports, we saw xprtrdma entering a non-recoverable state
where it is not even possible to complete the disconnect and shut it
down the mount, requiring a reboot. Following debug, we saw that
transport connect never ended after receiving the
RDMA_CM_EVENT_DEVICE_REMOVAL callback.

The DEVICE_REMOVAL callback is irrespective of whether the CM_ID is
connected, and ESTABLISHED may not have happened. So need to work with
each of these states accordingly.

Fixes: 2acc5cae29 ('xprtrdma: Prevent dereferencing r_xprt->rx_ep after it is freed')
Cc: Sagi Grimberg <sagi.grimberg@vastdata.com>
Signed-off-by: Dan Aloni <dan.aloni@vastdata.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Dan Aloni 2024-05-06 12:37:59 +03:00 committed by Trond Myklebust
parent d1404e46ae
commit 4836da2197
1 changed files with 5 additions and 1 deletions
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6
net/sunrpc/xprtrdma/verbs.c
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@ -244,7 +244,11 @@ rpcrdma_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
case RDMA_CM_EVENT_DEVICE_REMOVAL:
pr_info("rpcrdma: removing device %s for %pISpc\n",
ep->re_id->device->name, sap);
fallthrough;
switch (xchg(&ep->re_connect_status, -ENODEV)) {
case 0: goto wake_connect_worker;
case 1: goto disconnected;
}
return 0;
case RDMA_CM_EVENT_ADDR_CHANGE:
ep->re_connect_status = -ENODEV;
goto disconnected;