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xprtrdma: Refactor rpcrdma_ia_open()

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In order to unload a device driver and reload it, xprtrdma will need
to close a transport's interface adapter, and then call
rpcrdma_ia_open again, possibly finding a different interface
adapter.

Make rpcrdma_ia_open safe to call on the same transport multiple
times.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2017-04-11 13:22:54 -04:00 committed by Anna Schumaker
parent 33849792cb
commit fff09594ed
3 changed files with 32 additions and 27 deletions
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6
net/sunrpc/xprtrdma/transport.c
View File

@ -66,8 +66,8 @@ static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
static unsigned int xprt_rdma_inline_write_padding;
static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR;
int xprt_rdma_pad_optimize = 0;
unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR;
int xprt_rdma_pad_optimize;
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
@ -396,7 +396,7 @@ xprt_setup_rdma(struct xprt_create *args)
new_xprt = rpcx_to_rdmax(xprt);
rc = rpcrdma_ia_open(new_xprt, sap, xprt_rdma_memreg_strategy);
rc = rpcrdma_ia_open(new_xprt, sap);
if (rc)
goto out1;

46
net/sunrpc/xprtrdma/verbs.c
View File

@ -413,13 +413,16 @@ rpcrdma_create_id(struct rpcrdma_xprt *xprt,
* Exported functions.
*/
/*
* Open and initialize an Interface Adapter.
* o initializes fields of struct rpcrdma_ia, including
* interface and provider attributes and protection zone.
/**
* rpcrdma_ia_open - Open and initialize an Interface Adapter.
* @xprt: controlling transport
* @addr: IP address of remote peer
*
* Returns 0 on success, negative errno if an appropriate
* Interface Adapter could not be found and opened.
*/
int
rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr)
{
struct rpcrdma_ia *ia = &xprt->rx_ia;
int rc;
@ -427,7 +430,7 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
ia->ri_id = rpcrdma_create_id(xprt, ia, addr);
if (IS_ERR(ia->ri_id)) {
rc = PTR_ERR(ia->ri_id);
goto out1;
goto out_err;
}
ia->ri_device = ia->ri_id->device;
@ -435,10 +438,10 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
if (IS_ERR(ia->ri_pd)) {
rc = PTR_ERR(ia->ri_pd);
pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc);
goto out2;
goto out_err;
}
switch (memreg) {
switch (xprt_rdma_memreg_strategy) {
case RPCRDMA_FRMR:
if (frwr_is_supported(ia)) {
ia->ri_ops = &rpcrdma_frwr_memreg_ops;
@ -452,28 +455,23 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
}
/*FALLTHROUGH*/
default:
pr_err("rpcrdma: Unsupported memory registration mode: %d\n",
memreg);
pr_err("rpcrdma: Device %s does not support memreg mode %d\n",
ia->ri_device->name, xprt_rdma_memreg_strategy);
rc = -EINVAL;
goto out3;
goto out_err;
}
return 0;
out3:
ib_dealloc_pd(ia->ri_pd);
ia->ri_pd = NULL;
out2:
rpcrdma_destroy_id(ia->ri_id);
ia->ri_id = NULL;
out1:
out_err:
rpcrdma_ia_close(ia);
return rc;
}
/*
* Clean up/close an IA.
* o if event handles and PD have been initialized, free them.
* o close the IA
/**
* rpcrdma_ia_close - Clean up/close an IA.
* @ia: interface adapter to close
*
*/
void
rpcrdma_ia_close(struct rpcrdma_ia *ia)
@ -483,12 +481,14 @@ rpcrdma_ia_close(struct rpcrdma_ia *ia)
if (ia->ri_id->qp)
rdma_destroy_qp(ia->ri_id);
rpcrdma_destroy_id(ia->ri_id);
ia->ri_id = NULL;
}
ia->ri_id = NULL;
ia->ri_device = NULL;
/* If the pd is still busy, xprtrdma missed freeing a resource */
if (ia->ri_pd && !IS_ERR(ia->ri_pd))
ib_dealloc_pd(ia->ri_pd);
ia->ri_pd = NULL;
}
/*

7
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -497,10 +497,15 @@ struct rpcrdma_xprt {
* Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
extern int xprt_rdma_pad_optimize;
/* This setting controls the hunt for a supported memory
* registration strategy.
*/
extern unsigned int xprt_rdma_memreg_strategy;
/*
* Interface Adapter calls - xprtrdma/verbs.c
*/
int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int);
int rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr);
void rpcrdma_ia_close(struct rpcrdma_ia *);
bool frwr_is_supported(struct rpcrdma_ia *);
bool fmr_is_supported(struct rpcrdma_ia *);