/* It shouldn't matter if the number of backchannel session slots
* doesn't match the number of RPC/RDMA credits. That just means
* one or the other will have extra slots that aren't used.
*/
static struct rpc_xprt *
xprt_setup_rdma_bc(struct xprt_create *args)
{
struct rpc_xprt *xprt;
struct rpcrdma_xprt *new_xprt;
if (args->addrlen > sizeof(xprt->addr)) {
dprintk("RPC: %s: address too large\n", __func__);
return ERR_PTR(-EBADF);
}
xprt = xprt_alloc(args->net, sizeof(*new_xprt),
RPCRDMA_MAX_BC_REQUESTS,
RPCRDMA_MAX_BC_REQUESTS);
if (!xprt) {
dprintk("RPC: %s: couldn't allocate rpc_xprt\n",
__func__);
return ERR_PTR(-ENOMEM);
}
xprt->timeout = &xprt_rdma_bc_timeout;
xprt_set_bound(xprt);
xprt_set_connected(xprt);
xprt->bind_timeout = RPCRDMA_BIND_TO;
xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
xprt->prot = XPRT_TRANSPORT_BC_RDMA;
xprt->tsh_size = RPCRDMA_HDRLEN_MIN / sizeof(__be32);
xprt->ops = &xprt_rdma_bc_procs;
memcpy(&xprt->addr, args->dstaddr, args->addrlen);
xprt->addrlen = args->addrlen;
xprt_rdma_format_addresses(xprt, (struct sockaddr *)&xprt->addr);
xprt->resvport = 0;
xprt->max_payload = xprt_rdma_max_inline_read;
new_xprt = rpcx_to_rdmax(xprt);
new_xprt->rx_buf.rb_bc_max_requests = xprt->max_reqs;
xprt_get(xprt);
args->bc_xprt->xpt_bc_xprt = xprt;
xprt->bc_xprt = args->bc_xprt;
if (!try_module_get(THIS_MODULE))
goto out_fail;
/* Final put for backchannel xprt is in __svc_rdma_free */
xprt_get(xprt);
return xprt;
out_fail:
xprt_rdma_free_addresses(xprt);
args->bc_xprt->xpt_bc_xprt = NULL;
args->bc_xprt->xpt_bc_xps = NULL;
xprt_put(xprt);
xprt_free(xprt);
return ERR_PTR(-EINVAL);
}
/**
* xprt_setup_rdma - Set up transport to use RDMA
*
* @args: rpc transport arguments
*/
static struct rpc_xprt *
xprt_setup_rdma(struct xprt_create *args)
{
struct rpcrdma_create_data_internal cdata;
struct rpc_xprt *xprt;
struct rpcrdma_xprt *new_xprt;
struct rpcrdma_ep *new_ep;
struct sockaddr *sap;
int rc;
if (args->addrlen > sizeof(xprt->addr)) {
dprintk("RPC: %s: address too large\n", __func__);
return ERR_PTR(-EBADF);
}
xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 0);
if (xprt == NULL) {
dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
__func__);
return ERR_PTR(-ENOMEM);
}
/* 60 second timeout, no retries */
xprt->timeout = &xprt_rdma_default_timeout;
xprt->bind_timeout = RPCRDMA_BIND_TO;
xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
xprt->resvport = 0; /* privileged port not needed */
xprt->tsh_size = 0; /* RPC-RDMA handles framing */
xprt->ops = &xprt_rdma_procs;
/*
* Set up RDMA-specific connect data.
*/
sap = args->dstaddr;
/* Ensure xprt->addr holds valid server TCP (not RDMA)
* address, for any side protocols which peek at it */
xprt->prot = IPPROTO_TCP;
xprt->addrlen = args->addrlen;
memcpy(&xprt->addr, sap, xprt->addrlen);
if (rpc_get_port(sap))
xprt_set_bound(xprt);
xprt_rdma_format_addresses(xprt, sap);
cdata.max_requests = xprt_rdma_slot_table_entries;
cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
cdata.inline_wsize = xprt_rdma_max_inline_write;
if (cdata.inline_wsize > cdata.wsize)
cdata.inline_wsize = cdata.wsize;
cdata.inline_rsize = xprt_rdma_max_inline_read;
if (cdata.inline_rsize > cdata.rsize)
cdata.inline_rsize = cdata.rsize;
/*
* Create new transport instance, which includes initialized
* o ia
* o endpoint
* o buffers
*/
new_xprt = rpcx_to_rdmax(xprt);
rc = rpcrdma_ia_open(new_xprt);
if (rc)
goto out1;
/*
* initialize and create ep
*/
new_xprt->rx_data = cdata;
new_ep = &new_xprt->rx_ep;
rc = rpcrdma_ep_create(&new_xprt->rx_ep,
&new_xprt->rx_ia, &new_xprt->rx_data);
if (rc)
goto out2;
rc = rpcrdma_buffer_create(new_xprt);
if (rc)
goto out3;
INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
xprt_rdma_connect_worker);
xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
if (xprt->max_payload == 0)
goto out4;
xprt->max_payload <<= PAGE_SHIFT;
dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
__func__, xprt->max_payload);
if (!try_module_get(THIS_MODULE))
goto out4;
dprintk("RPC: %s: %s:%s\n", __func__,
xprt->address_strings[RPC_DISPLAY_ADDR],
xprt->address_strings[RPC_DISPLAY_PORT]);
trace_xprtrdma_create(new_xprt);
return xprt;
out4:
rpcrdma_buffer_destroy(&new_xprt->rx_buf);
rc = -ENODEV;
out3:
rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
out2:
rpcrdma_ia_close(&new_xprt->rx_ia);
out1:
trace_xprtrdma_destroy(new_xprt);
xprt_rdma_free_addresses(xprt);
xprt_free(xprt);
return ERR_PTR(rc);
}
/**
* xprt_setup_rdma - Set up transport to use RDMA
*
* @args: rpc transport arguments
*/
static struct rpc_xprt *
xprt_setup_rdma(struct xprt_create *args)
{
struct rpcrdma_create_data_internal cdata;
struct rpc_xprt *xprt;
struct rpcrdma_xprt *new_xprt;
struct rpcrdma_ep *new_ep;
struct sockaddr_in *sin;
int rc;
if (args->addrlen > sizeof(xprt->addr)) {
dprintk("RPC: %s: address too large\n", __func__);
return ERR_PTR(-EBADF);
}
xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
xprt_rdma_slot_table_entries,
xprt_rdma_slot_table_entries);
if (xprt == NULL) {
dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
__func__);
return ERR_PTR(-ENOMEM);
}
/* 60 second timeout, no retries */
xprt->timeout = &xprt_rdma_default_timeout;
xprt->bind_timeout = RPCRDMA_BIND_TO;
xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
xprt->resvport = 0; /* privileged port not needed */
xprt->tsh_size = 0; /* RPC-RDMA handles framing */
xprt->ops = &xprt_rdma_procs;
/*
* Set up RDMA-specific connect data.
*/
/* Put server RDMA address in local cdata */
memcpy(&cdata.addr, args->dstaddr, args->addrlen);
/* Ensure xprt->addr holds valid server TCP (not RDMA)
* address, for any side protocols which peek at it */
xprt->prot = IPPROTO_TCP;
xprt->addrlen = args->addrlen;
memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);
sin = (struct sockaddr_in *)&cdata.addr;
if (ntohs(sin->sin_port) != 0)
xprt_set_bound(xprt);
dprintk("RPC: %s: %pI4:%u\n",
__func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port));
/* Set max requests */
cdata.max_requests = xprt->max_reqs;
/* Set some length limits */
cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
cdata.inline_wsize = xprt_rdma_max_inline_write;
if (cdata.inline_wsize > cdata.wsize)
cdata.inline_wsize = cdata.wsize;
cdata.inline_rsize = xprt_rdma_max_inline_read;
if (cdata.inline_rsize > cdata.rsize)
cdata.inline_rsize = cdata.rsize;
cdata.padding = xprt_rdma_inline_write_padding;
/*
* Create new transport instance, which includes initialized
* o ia
* o endpoint
* o buffers
*/
new_xprt = rpcx_to_rdmax(xprt);
rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
xprt_rdma_memreg_strategy);
if (rc)
goto out1;
/*
* initialize and create ep
*/
new_xprt->rx_data = cdata;
new_ep = &new_xprt->rx_ep;
new_ep->rep_remote_addr = cdata.addr;
rc = rpcrdma_ep_create(&new_xprt->rx_ep,
&new_xprt->rx_ia, &new_xprt->rx_data);
if (rc)
goto out2;
/*
* Allocate pre-registered send and receive buffers for headers and
* any inline data. Also specify any padding which will be provided
* from a preregistered zero buffer.
*/
rc = rpcrdma_buffer_create(new_xprt);
if (rc)
goto out3;
/*
* Register a callback for connection events. This is necessary because
* connection loss notification is async. We also catch connection loss
* when reaping receives.
*/
INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
xprt_rdma_connect_worker);
xprt_rdma_format_addresses(xprt);
xprt->max_payload = rpcrdma_max_payload(new_xprt);
dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
__func__, xprt->max_payload);
if (!try_module_get(THIS_MODULE))
goto out4;
return xprt;
out4:
xprt_rdma_free_addresses(xprt);
rc = -EINVAL;
out3:
rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
out2:
rpcrdma_ia_close(&new_xprt->rx_ia);
out1:
xprt_free(xprt);
return ERR_PTR(rc);
}