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svcrdma: Add backward direction service for RPC/RDMA transport 

On NFSv4.1 mount points, the Linux NFS client uses this transport
endpoint to receive backward direction calls and route replies back
to the NFSv4.1 server.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: "J. Bruce Fields" <bfields@fieldses.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Tested-By: Devesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2015-10-24 17:28:16 -04:00 committed by Anna Schumaker
parent 63cae47005
commit 9468431962
4 changed files with 70 additions and 1 deletions
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6
include/linux/sunrpc/svc_rdma.h
View File

@ -228,9 +228,13 @@ extern void svc_rdma_put_frmr(struct svcxprt_rdma *,
struct svc_rdma_fastreg_mr *);
extern void svc_sq_reap(struct svcxprt_rdma *);
extern void svc_rq_reap(struct svcxprt_rdma *);
extern struct svc_xprt_class svc_rdma_class;
extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
extern struct svc_xprt_class svc_rdma_class;
#ifdef CONFIG_SUNRPC_BACKCHANNEL
extern struct svc_xprt_class svc_rdma_bc_class;
#endif
/* svc_rdma.c */
extern int svc_rdma_init(void);
extern void svc_rdma_cleanup(void);

1
include/linux/sunrpc/xprt.h
View File

@ -158,6 +158,7 @@ enum xprt_transports {
XPRT_TRANSPORT_TCP = IPPROTO_TCP,
XPRT_TRANSPORT_BC_TCP = IPPROTO_TCP | XPRT_TRANSPORT_BC,
XPRT_TRANSPORT_RDMA = 256,
XPRT_TRANSPORT_BC_RDMA = XPRT_TRANSPORT_RDMA | XPRT_TRANSPORT_BC,
XPRT_TRANSPORT_LOCAL = 257,
};

6
net/sunrpc/xprtrdma/svc_rdma.c
View File

@ -239,6 +239,9 @@ void svc_rdma_cleanup(void)
unregister_sysctl_table(svcrdma_table_header);
svcrdma_table_header = NULL;
}
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
svc_unreg_xprt_class(&svc_rdma_bc_class);
#endif
svc_unreg_xprt_class(&svc_rdma_class);
kmem_cache_destroy(svc_rdma_map_cachep);
kmem_cache_destroy(svc_rdma_ctxt_cachep);
@ -286,6 +289,9 @@ int svc_rdma_init(void)
/* Register RDMA with the SVC transport switch */
svc_reg_xprt_class(&svc_rdma_class);
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
svc_reg_xprt_class(&svc_rdma_bc_class);
#endif
return 0;
err1:
kmem_cache_destroy(svc_rdma_map_cachep);

58
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -56,6 +56,7 @@
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *, int);
static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
struct net *net,
struct sockaddr *sa, int salen,
@ -95,6 +96,63 @@ struct svc_xprt_class svc_rdma_class = {
.xcl_ident = XPRT_TRANSPORT_RDMA,
};
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *,
struct sockaddr *, int, int);
static void svc_rdma_bc_detach(struct svc_xprt *);
static void svc_rdma_bc_free(struct svc_xprt *);
static struct svc_xprt_ops svc_rdma_bc_ops = {
.xpo_create = svc_rdma_bc_create,
.xpo_detach = svc_rdma_bc_detach,
.xpo_free = svc_rdma_bc_free,
.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
.xpo_secure_port = svc_rdma_secure_port,
};
struct svc_xprt_class svc_rdma_bc_class = {
.xcl_name = "rdma-bc",
.xcl_owner = THIS_MODULE,
.xcl_ops = &svc_rdma_bc_ops,
.xcl_max_payload = (1024 - RPCRDMA_HDRLEN_MIN)
};
static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv,
struct net *net,
struct sockaddr *sa, int salen,
int flags)
{
struct svcxprt_rdma *cma_xprt;
struct svc_xprt *xprt;
cma_xprt = rdma_create_xprt(serv, 0);
if (!cma_xprt)
return ERR_PTR(-ENOMEM);
xprt = &cma_xprt->sc_xprt;
svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv);
serv->sv_bc_xprt = xprt;
dprintk("svcrdma: %s(%p)\n", __func__, xprt);
return xprt;
}
static void svc_rdma_bc_detach(struct svc_xprt *xprt)
{
dprintk("svcrdma: %s(%p)\n", __func__, xprt);
}
static void svc_rdma_bc_free(struct svc_xprt *xprt)
{
struct svcxprt_rdma *rdma =
container_of(xprt, struct svcxprt_rdma, sc_xprt);
dprintk("svcrdma: %s(%p)\n", __func__, xprt);
if (xprt)
kfree(rdma);
}
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
{
struct svc_rdma_op_ctxt *ctxt;