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@xxxxxxxxxx>
---
net/sunrpc/xprtrdma/transport.c | 6 +++--
net/sunrpc/xprtrdma/verbs.c | 46 ++++++++++++++++++++-------------------
net/sunrpc/xprtrdma/xprt_rdma.h | 7 +++++-
3 files changed, 32 insertions(+), 27 deletions(-)
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index acf5d81..83e219d 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -66,8 +66,8 @@
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 @@
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;
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 2e4fc1e..d4880d5 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -413,13 +413,16 @@ static void rpcrdma_destroy_id(struct rdma_cm_id *id)
* 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 @@ static void rpcrdma_destroy_id(struct rdma_cm_id *id)
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 @@ static void rpcrdma_destroy_id(struct rdma_cm_id *id)
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 @@ static void rpcrdma_destroy_id(struct rdma_cm_id *id)
}
/*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 @@ static void rpcrdma_destroy_id(struct rdma_cm_id *id)
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;
}
/*
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 171a351..af844fc 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -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 *);
--
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