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>
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Родитель
63cae47005
Коммит
9468431962
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@ -228,9 +228,13 @@ extern void svc_rdma_put_frmr(struct svcxprt_rdma *,
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struct svc_rdma_fastreg_mr *);
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extern void svc_sq_reap(struct svcxprt_rdma *);
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extern void svc_rq_reap(struct svcxprt_rdma *);
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extern struct svc_xprt_class svc_rdma_class;
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extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
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extern struct svc_xprt_class svc_rdma_class;
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#ifdef CONFIG_SUNRPC_BACKCHANNEL
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extern struct svc_xprt_class svc_rdma_bc_class;
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#endif
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/* svc_rdma.c */
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extern int svc_rdma_init(void);
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extern void svc_rdma_cleanup(void);
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@ -158,6 +158,7 @@ enum xprt_transports {
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XPRT_TRANSPORT_TCP = IPPROTO_TCP,
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XPRT_TRANSPORT_BC_TCP = IPPROTO_TCP | XPRT_TRANSPORT_BC,
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XPRT_TRANSPORT_RDMA = 256,
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XPRT_TRANSPORT_BC_RDMA = XPRT_TRANSPORT_RDMA | XPRT_TRANSPORT_BC,
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XPRT_TRANSPORT_LOCAL = 257,
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};
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@ -239,6 +239,9 @@ void svc_rdma_cleanup(void)
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unregister_sysctl_table(svcrdma_table_header);
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svcrdma_table_header = NULL;
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}
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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svc_unreg_xprt_class(&svc_rdma_bc_class);
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#endif
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svc_unreg_xprt_class(&svc_rdma_class);
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kmem_cache_destroy(svc_rdma_map_cachep);
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kmem_cache_destroy(svc_rdma_ctxt_cachep);
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@ -286,6 +289,9 @@ int svc_rdma_init(void)
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/* Register RDMA with the SVC transport switch */
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svc_reg_xprt_class(&svc_rdma_class);
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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svc_reg_xprt_class(&svc_rdma_bc_class);
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#endif
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return 0;
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err1:
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kmem_cache_destroy(svc_rdma_map_cachep);
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@ -56,6 +56,7 @@
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT
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static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *, int);
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static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
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struct net *net,
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struct sockaddr *sa, int salen,
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@ -95,6 +96,63 @@ struct svc_xprt_class svc_rdma_class = {
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.xcl_ident = XPRT_TRANSPORT_RDMA,
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};
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *,
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struct sockaddr *, int, int);
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static void svc_rdma_bc_detach(struct svc_xprt *);
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static void svc_rdma_bc_free(struct svc_xprt *);
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static struct svc_xprt_ops svc_rdma_bc_ops = {
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.xpo_create = svc_rdma_bc_create,
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.xpo_detach = svc_rdma_bc_detach,
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.xpo_free = svc_rdma_bc_free,
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.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
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.xpo_secure_port = svc_rdma_secure_port,
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};
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struct svc_xprt_class svc_rdma_bc_class = {
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.xcl_name = "rdma-bc",
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.xcl_owner = THIS_MODULE,
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.xcl_ops = &svc_rdma_bc_ops,
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.xcl_max_payload = (1024 - RPCRDMA_HDRLEN_MIN)
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};
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static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv,
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struct net *net,
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struct sockaddr *sa, int salen,
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int flags)
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{
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struct svcxprt_rdma *cma_xprt;
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struct svc_xprt *xprt;
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cma_xprt = rdma_create_xprt(serv, 0);
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if (!cma_xprt)
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return ERR_PTR(-ENOMEM);
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xprt = &cma_xprt->sc_xprt;
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svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv);
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serv->sv_bc_xprt = xprt;
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dprintk("svcrdma: %s(%p)\n", __func__, xprt);
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return xprt;
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}
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static void svc_rdma_bc_detach(struct svc_xprt *xprt)
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{
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dprintk("svcrdma: %s(%p)\n", __func__, xprt);
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}
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static void svc_rdma_bc_free(struct svc_xprt *xprt)
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{
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struct svcxprt_rdma *rdma =
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container_of(xprt, struct svcxprt_rdma, sc_xprt);
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dprintk("svcrdma: %s(%p)\n", __func__, xprt);
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if (xprt)
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kfree(rdma);
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}
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
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{
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struct svc_rdma_op_ctxt *ctxt;
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