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| author |   Chuck Lever <chuck.lever@oracle.com> | 2017-04-11 13:23:10 -0400 |
|---|---|---|
| committer |   Anna Schumaker <Anna.Schumaker@Netapp.com> | 2017-04-25 16:12:24 -0400 |
| commit | bebd031866caa404c522e91bb6fd0c69be04c707 (patch) | |
| tree | 5046d400f405f383e1823d140e18c3f878002cec /net/sunrpc/xprtrdma/xprt_rdma.h | |
| parent | xprtrdma: Use same device when mapping or syncing DMA buffers (diff) | |
| download | linux-dev-bebd031866caa404c522e91bb6fd0c69be04c707.tar.xz linux-dev-bebd031866caa404c522e91bb6fd0c69be04c707.zip | |
xprtrdma: Support unplugging an HCA from under an NFS mount
The device driver for the underlying physical device associated
with an RPC-over-RDMA transport can be removed while RPC-over-RDMA
transports are still in use (ie, while NFS filesystems are still
mounted and active). The IB core performs a connection event upcall
to request that consumers free all RDMA resources associated with
a transport.
There may be pending RPCs when this occurs. Care must be taken to
release associated resources without leaving references that can
trigger a subsequent crash if a signal or soft timeout occurs. We
rely on the caller of the transport's ->close method to ensure that
the previous RPC task has invoked xprt_release but the transport
remains write-locked.
A DEVICE_REMOVE upcall forces a disconnect then sleeps. When ->close
is invoked, it destroys the transport's H/W resources, then wakes
the upcall, which completes and allows the core driver unload to
continue.
BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=266
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc/xprtrdma/xprt_rdma.h')
| -rw-r--r-- | net/sunrpc/xprtrdma/xprt_rdma.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h index 9d58260533fc..1c5de1af195b 100644 --- a/net/sunrpc/xprtrdma/xprt_rdma.h +++ b/net/sunrpc/xprtrdma/xprt_rdma.h @@ -69,6 +69,7 @@ struct rpcrdma_ia { struct rdma_cm_id *ri_id; struct ib_pd *ri_pd; struct completion ri_done; + struct completion ri_remove_done; int ri_async_rc; unsigned int ri_max_segs; unsigned int ri_max_frmr_depth; @@ -78,10 +79,15 @@ struct rpcrdma_ia { bool ri_reminv_expected; bool ri_implicit_roundup; enum ib_mr_type ri_mrtype; + unsigned long ri_flags; struct ib_qp_attr ri_qp_attr; struct ib_qp_init_attr ri_qp_init_attr; }; +enum { + RPCRDMA_IAF_REMOVING = 0, +}; + /* * RDMA Endpoint -- one per transport instance */ @@ -511,6 +517,7 @@ extern unsigned int xprt_rdma_memreg_strategy; * Interface Adapter calls - xprtrdma/verbs.c */ int rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr); +void rpcrdma_ia_remove(struct rpcrdma_ia *ia); void rpcrdma_ia_close(struct rpcrdma_ia *); bool frwr_is_supported(struct rpcrdma_ia *); bool fmr_is_supported(struct rpcrdma_ia *); |