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NFS-over-RDMA client updates for Linux 4.18

Browse Source 
Stable patches:
 - xprtrdma: Return -ENOBUFS when no pages are available
 
 New features:
 - Add ->alloc_slot() and ->free_slot() functions
 
 Bugfixes and cleanups:
 - Add missing SPDX tags to some files
 - Try to fail mount quickly if client has no RDMA devices
 - Create transport IDs in the correct network namespace
 - Fix max_send_wr computation
 - Clean up receive tracepoints
 - Refactor receive handling
 - Remove unused functions
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Merge tag 'nfs-rdma-for-4.18-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

NFS-over-RDMA client updates for Linux 4.18

Stable patches:
- xprtrdma: Return -ENOBUFS when no pages are available

New features:
- Add ->alloc_slot() and ->free_slot() functions

Bugfixes and cleanups:
- Add missing SPDX tags to some files
- Try to fail mount quickly if client has no RDMA devices
- Create transport IDs in the correct network namespace
- Fix max_send_wr computation
- Clean up receive tracepoints
- Refactor receive handling
- Remove unused functions
This commit is contained in:
Trond Myklebust 2018-06-04 18:57:13 -04:00
commit fcda3d5d22
16 changed files with 361 additions and 357 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -1,3 +1,4 @@
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/*
* Copyright (c) 2015-2017 Oracle. All rights reserved.
* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.

6
include/linux/sunrpc/xprt.h
View File

@ -84,7 +84,6 @@ struct rpc_rqst {
void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
struct list_head rq_list;
void *rq_xprtdata; /* Per-xprt private data */
void *rq_buffer; /* Call XDR encode buffer */
size_t rq_callsize;
void *rq_rbuffer; /* Reply XDR decode buffer */
@ -127,6 +126,8 @@ struct rpc_xprt_ops {
int (*reserve_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
void (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
void (*alloc_slot)(struct rpc_xprt *xprt, struct rpc_task *task);
void (*free_slot)(struct rpc_xprt *xprt,
struct rpc_rqst *req);
void (*rpcbind)(struct rpc_task *task);
void (*set_port)(struct rpc_xprt *xprt, unsigned short port);
void (*connect)(struct rpc_xprt *xprt, struct rpc_task *task);
@ -324,10 +325,13 @@ struct xprt_class {
struct rpc_xprt *xprt_create_transport(struct xprt_create *args);
void xprt_connect(struct rpc_task *task);
void xprt_reserve(struct rpc_task *task);
void xprt_request_init(struct rpc_task *task);
void xprt_retry_reserve(struct rpc_task *task);
int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
void xprt_free_slot(struct rpc_xprt *xprt,
struct rpc_rqst *req);
void xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
bool xprt_prepare_transmit(struct rpc_task *task);
void xprt_transmit(struct rpc_task *task);

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

@ -1,3 +1,4 @@
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/*
* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
*

82
include/trace/events/rpcrdma.h
View File

@ -528,24 +528,54 @@ TRACE_EVENT(xprtrdma_post_send,
TRACE_EVENT(xprtrdma_post_recv,
TP_PROTO(
const struct rpcrdma_rep *rep,
int status
const struct ib_cqe *cqe
),
TP_ARGS(rep, status),
TP_ARGS(cqe),
TP_STRUCT__entry(
__field(const void *, rep)
__field(int, status)
__field(const void *, cqe)
),
TP_fast_assign(
__entry->rep = rep;
__entry->status = status;
__entry->cqe = cqe;
),
TP_printk("rep=%p status=%d",
__entry->rep, __entry->status
TP_printk("cqe=%p",
__entry->cqe
)
);
TRACE_EVENT(xprtrdma_post_recvs,
TP_PROTO(
const struct rpcrdma_xprt *r_xprt,
unsigned int count,
int status
),
TP_ARGS(r_xprt, count, status),
TP_STRUCT__entry(
__field(const void *, r_xprt)
__field(unsigned int, count)
__field(int, status)
__field(int, posted)
__string(addr, rpcrdma_addrstr(r_xprt))
__string(port, rpcrdma_portstr(r_xprt))
),
TP_fast_assign(
__entry->r_xprt = r_xprt;
__entry->count = count;
__entry->status = status;
__entry->posted = r_xprt->rx_buf.rb_posted_receives;
__assign_str(addr, rpcrdma_addrstr(r_xprt));
__assign_str(port, rpcrdma_portstr(r_xprt));
),
TP_printk("peer=[%s]:%s r_xprt=%p: %u new recvs, %d active (rc %d)",
__get_str(addr), __get_str(port), __entry->r_xprt,
__entry->count, __entry->posted, __entry->status
)
);
@ -584,28 +614,32 @@ TRACE_EVENT(xprtrdma_wc_send,
TRACE_EVENT(xprtrdma_wc_receive,
TP_PROTO(
const struct rpcrdma_rep *rep,
const struct ib_wc *wc
),
TP_ARGS(rep, wc),
TP_ARGS(wc),
TP_STRUCT__entry(
__field(const void *, rep)
__field(unsigned int, byte_len)
__field(const void *, cqe)
__field(u32, byte_len)
__field(unsigned int, status)
__field(unsigned int, vendor_err)
__field(u32, vendor_err)
),
TP_fast_assign(
__entry->rep = rep;
__entry->byte_len = wc->byte_len;
__entry->cqe = wc->wr_cqe;
__entry->status = wc->status;
__entry->vendor_err = __entry->status ? wc->vendor_err : 0;
if (wc->status) {
__entry->byte_len = 0;
__entry->vendor_err = wc->vendor_err;
} else {
__entry->byte_len = wc->byte_len;
__entry->vendor_err = 0;
}
),
TP_printk("rep=%p, %u bytes: %s (%u/0x%x)",
__entry->rep, __entry->byte_len,
TP_printk("cqe=%p %u bytes: %s (%u/0x%x)",
__entry->cqe, __entry->byte_len,
rdma_show_wc_status(__entry->status),
__entry->status, __entry->vendor_err
)
@ -616,6 +650,7 @@ DEFINE_FRWR_DONE_EVENT(xprtrdma_wc_li);
DEFINE_FRWR_DONE_EVENT(xprtrdma_wc_li_wake);
DEFINE_MR_EVENT(xprtrdma_localinv);
DEFINE_MR_EVENT(xprtrdma_dma_map);
DEFINE_MR_EVENT(xprtrdma_dma_unmap);
DEFINE_MR_EVENT(xprtrdma_remoteinv);
DEFINE_MR_EVENT(xprtrdma_recover_mr);
@ -799,7 +834,6 @@ TRACE_EVENT(xprtrdma_allocate,
__field(unsigned int, task_id)
__field(unsigned int, client_id)
__field(const void *, req)
__field(const void *, rep)
__field(size_t, callsize)
__field(size_t, rcvsize)
),
@ -808,15 +842,13 @@ TRACE_EVENT(xprtrdma_allocate,
__entry->task_id = task->tk_pid;
__entry->client_id = task->tk_client->cl_clid;
__entry->req = req;
__entry->rep = req ? req->rl_reply : NULL;
__entry->callsize = task->tk_rqstp->rq_callsize;
__entry->rcvsize = task->tk_rqstp->rq_rcvsize;
),
TP_printk("task:%u@%u req=%p rep=%p (%zu, %zu)",
TP_printk("task:%u@%u req=%p (%zu, %zu)",
__entry->task_id, __entry->client_id,
__entry->req, __entry->rep,
__entry->callsize, __entry->rcvsize
__entry->req, __entry->callsize, __entry->rcvsize
)
);
@ -848,8 +880,6 @@ TRACE_EVENT(xprtrdma_rpc_done,
)
);
DEFINE_RXPRT_EVENT(xprtrdma_noreps);
/**
** Callback events
**/

1
net/sunrpc/clnt.c
View File

@ -1546,6 +1546,7 @@ call_reserveresult(struct rpc_task *task)
task->tk_status = 0;
if (status >= 0) {
if (task->tk_rqstp) {
xprt_request_init(task);
task->tk_action = call_refresh;
return;
}

17
net/sunrpc/xprt.c
View File

@ -66,7 +66,7 @@
* Local functions
*/
static void xprt_init(struct rpc_xprt *xprt, struct net *net);
static void xprt_request_init(struct rpc_task *, struct rpc_xprt *);
static __be32 xprt_alloc_xid(struct rpc_xprt *xprt);
static void xprt_connect_status(struct rpc_task *task);
static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *);
static void __xprt_put_cong(struct rpc_xprt *, struct rpc_rqst *);
@ -987,6 +987,8 @@ bool xprt_prepare_transmit(struct rpc_task *task)
task->tk_status = -EAGAIN;
goto out_unlock;
}
if (!bc_prealloc(req) && !req->rq_xmit_bytes_sent)
req->rq_xid = xprt_alloc_xid(xprt);
ret = true;
out_unlock:
spin_unlock_bh(&xprt->transport_lock);
@ -1163,10 +1165,10 @@ void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
out_init_req:
xprt->stat.max_slots = max_t(unsigned int, xprt->stat.max_slots,
xprt->num_reqs);
spin_unlock(&xprt->reserve_lock);
task->tk_status = 0;
task->tk_rqstp = req;
xprt_request_init(task, xprt);
spin_unlock(&xprt->reserve_lock);
}
EXPORT_SYMBOL_GPL(xprt_alloc_slot);
@ -1184,7 +1186,7 @@ void xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
}
EXPORT_SYMBOL_GPL(xprt_lock_and_alloc_slot);
static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req)
void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req)
{
spin_lock(&xprt->reserve_lock);
if (!xprt_dynamic_free_slot(xprt, req)) {
@ -1194,6 +1196,7 @@ static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req)
xprt_wake_up_backlog(xprt);
spin_unlock(&xprt->reserve_lock);
}
EXPORT_SYMBOL_GPL(xprt_free_slot);
static void xprt_free_all_slots(struct rpc_xprt *xprt)
{
@ -1303,8 +1306,9 @@ static inline void xprt_init_xid(struct rpc_xprt *xprt)
xprt->xid = prandom_u32();
}
static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
void xprt_request_init(struct rpc_task *task)
{
struct rpc_xprt *xprt = task->tk_xprt;
struct rpc_rqst *req = task->tk_rqstp;
INIT_LIST_HEAD(&req->rq_list);
@ -1312,7 +1316,6 @@ static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
req->rq_task = task;
req->rq_xprt = xprt;
req->rq_buffer = NULL;
req->rq_xid = xprt_alloc_xid(xprt);
req->rq_connect_cookie = xprt->connect_cookie - 1;
req->rq_bytes_sent = 0;
req->rq_snd_buf.len = 0;
@ -1373,7 +1376,7 @@ void xprt_release(struct rpc_task *task)
dprintk("RPC: %5u release request %p\n", task->tk_pid, req);
if (likely(!bc_prealloc(req)))
xprt_free_slot(xprt, req);
xprt->ops->free_slot(xprt, req);
else
xprt_free_bc_request(req);
}

103
net/sunrpc/xprtrdma/backchannel.c
View File

@ -29,29 +29,41 @@ static void rpcrdma_bc_free_rqst(struct rpcrdma_xprt *r_xprt,
spin_unlock(&buf->rb_reqslock);
rpcrdma_destroy_req(req);
kfree(rqst);
}
static int rpcrdma_bc_setup_rqst(struct rpcrdma_xprt *r_xprt,
struct rpc_rqst *rqst)
static int rpcrdma_bc_setup_reqs(struct rpcrdma_xprt *r_xprt,
unsigned int count)
{
struct rpcrdma_regbuf *rb;
struct rpcrdma_req *req;
size_t size;
struct rpc_xprt *xprt = &r_xprt->rx_xprt;
struct rpc_rqst *rqst;
unsigned int i;
req = rpcrdma_create_req(r_xprt);
if (IS_ERR(req))
return PTR_ERR(req);
for (i = 0; i < (count << 1); i++) {
struct rpcrdma_regbuf *rb;
struct rpcrdma_req *req;
size_t size;
size = r_xprt->rx_data.inline_rsize;
rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, GFP_KERNEL);
if (IS_ERR(rb))
goto out_fail;
req->rl_sendbuf = rb;
xdr_buf_init(&rqst->rq_snd_buf, rb->rg_base,
min_t(size_t, size, PAGE_SIZE));
rpcrdma_set_xprtdata(rqst, req);
req = rpcrdma_create_req(r_xprt);
if (IS_ERR(req))
return PTR_ERR(req);
rqst = &req->rl_slot;
rqst->rq_xprt = xprt;
INIT_LIST_HEAD(&rqst->rq_list);
INIT_LIST_HEAD(&rqst->rq_bc_list);
__set_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state);
spin_lock_bh(&xprt->bc_pa_lock);
list_add(&rqst->rq_bc_pa_list, &xprt->bc_pa_list);
spin_unlock_bh(&xprt->bc_pa_lock);
size = r_xprt->rx_data.inline_rsize;
rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, GFP_KERNEL);
if (IS_ERR(rb))
goto out_fail;
req->rl_sendbuf = rb;
xdr_buf_init(&rqst->rq_snd_buf, rb->rg_base,
min_t(size_t, size, PAGE_SIZE));
}
return 0;
out_fail:
@ -59,23 +71,6 @@ out_fail:
return -ENOMEM;
}
/* Allocate and add receive buffers to the rpcrdma_buffer's
* existing list of rep's. These are released when the
* transport is destroyed.
*/
static int rpcrdma_bc_setup_reps(struct rpcrdma_xprt *r_xprt,
unsigned int count)
{
int rc = 0;
while (count--) {
rc = rpcrdma_create_rep(r_xprt);
if (rc)
break;
}
return rc;
}
/**
* xprt_rdma_bc_setup - Pre-allocate resources for handling backchannel requests
* @xprt: transport associated with these backchannel resources
@ -86,9 +81,6 @@ static int rpcrdma_bc_setup_reps(struct rpcrdma_xprt *r_xprt,
int xprt_rdma_bc_setup(struct rpc_xprt *xprt, unsigned int reqs)
{
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
struct rpc_rqst *rqst;
unsigned int i;
int rc;
/* The backchannel reply path returns each rpc_rqst to the
@ -103,35 +95,11 @@ int xprt_rdma_bc_setup(struct rpc_xprt *xprt, unsigned int reqs)
if (reqs > RPCRDMA_BACKWARD_WRS >> 1)
goto out_err;
for (i = 0; i < (reqs << 1); i++) {
rqst = kzalloc(sizeof(*rqst), GFP_KERNEL);
if (!rqst)
goto out_free;
dprintk("RPC: %s: new rqst %p\n", __func__, rqst);
rqst->rq_xprt = &r_xprt->rx_xprt;
INIT_LIST_HEAD(&rqst->rq_list);
INIT_LIST_HEAD(&rqst->rq_bc_list);
__set_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state);
if (rpcrdma_bc_setup_rqst(r_xprt, rqst))
goto out_free;
spin_lock_bh(&xprt->bc_pa_lock);
list_add(&rqst->rq_bc_pa_list, &xprt->bc_pa_list);
spin_unlock_bh(&xprt->bc_pa_lock);
}
rc = rpcrdma_bc_setup_reps(r_xprt, reqs);
rc = rpcrdma_bc_setup_reqs(r_xprt, reqs);
if (rc)
goto out_free;
rc = rpcrdma_ep_post_extra_recv(r_xprt, reqs);
if (rc)
goto out_free;
buffer->rb_bc_srv_max_requests = reqs;
r_xprt->rx_buf.rb_bc_srv_max_requests = reqs;
request_module("svcrdma");
trace_xprtrdma_cb_setup(r_xprt, reqs);
return 0;
@ -235,6 +203,7 @@ int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst)
if (rc < 0)
goto failed_marshal;
rpcrdma_post_recvs(r_xprt, true);
if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
goto drop_connection;
return 0;
@ -275,10 +244,14 @@ void xprt_rdma_bc_destroy(struct rpc_xprt *xprt, unsigned int reqs)
*/
void xprt_rdma_bc_free_rqst(struct rpc_rqst *rqst)
{
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
struct rpc_xprt *xprt = rqst->rq_xprt;
dprintk("RPC: %s: freeing rqst %p (req %p)\n",
__func__, rqst, rpcr_to_rdmar(rqst));
__func__, rqst, req);
rpcrdma_recv_buffer_put(req->rl_reply);
req->rl_reply = NULL;
spin_lock_bh(&xprt->bc_pa_lock);
list_add_tail(&rqst->rq_bc_pa_list, &xprt->bc_pa_list);

23
net/sunrpc/xprtrdma/fmr_ops.c
View File

@ -156,10 +156,32 @@ out_release:
fmr_op_release_mr(mr);
}
/* On success, sets:
* ep->rep_attr.cap.max_send_wr
* ep->rep_attr.cap.max_recv_wr
* cdata->max_requests
* ia->ri_max_segs
*/
static int
fmr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
struct rpcrdma_create_data_internal *cdata)
{
int max_qp_wr;
max_qp_wr = ia->ri_device->attrs.max_qp_wr;
max_qp_wr -= RPCRDMA_BACKWARD_WRS;
max_qp_wr -= 1;
if (max_qp_wr < RPCRDMA_MIN_SLOT_TABLE)
return -ENOMEM;
if (cdata->max_requests > max_qp_wr)
cdata->max_requests = max_qp_wr;
ep->rep_attr.cap.max_send_wr = cdata->max_requests;
ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
ep->rep_attr.cap.max_send_wr += 1; /* for ib_drain_sq */
ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
ep->rep_attr.cap.max_recv_wr += 1; /* for ib_drain_rq */
ia->ri_max_segs = max_t(unsigned int, 1, RPCRDMA_MAX_DATA_SEGS /
RPCRDMA_MAX_FMR_SGES);
return 0;
@ -219,6 +241,7 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
mr->mr_sg, i, mr->mr_dir);
if (!mr->mr_nents)
goto out_dmamap_err;
trace_xprtrdma_dma_map(mr);
for (i = 0, dma_pages = mr->fmr.fm_physaddrs; i < mr->mr_nents; i++)
dma_pages[i] = sg_dma_address(&mr->mr_sg[i]);

31
net/sunrpc/xprtrdma/frwr_ops.c
View File

@ -202,12 +202,22 @@ out_release:
frwr_op_release_mr(mr);
}
/* On success, sets:
* ep->rep_attr.cap.max_send_wr
* ep->rep_attr.cap.max_recv_wr
* cdata->max_requests
* ia->ri_max_segs
*
* And these FRWR-related fields:
* ia->ri_max_frwr_depth
* ia->ri_mrtype
*/
static int
frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
struct rpcrdma_create_data_internal *cdata)
{
struct ib_device_attr *attrs = &ia->ri_device->attrs;
int depth, delta;
int max_qp_wr, depth, delta;
ia->ri_mrtype = IB_MR_TYPE_MEM_REG;
if (attrs->device_cap_flags & IB_DEVICE_SG_GAPS_REG)
@ -241,14 +251,26 @@ frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
} while (delta > 0);
}
ep->rep_attr.cap.max_send_wr *= depth;
if (ep->rep_attr.cap.max_send_wr > attrs->max_qp_wr) {
cdata->max_requests = attrs->max_qp_wr / depth;
max_qp_wr = ia->ri_device->attrs.max_qp_wr;
max_qp_wr -= RPCRDMA_BACKWARD_WRS;
max_qp_wr -= 1;
if (max_qp_wr < RPCRDMA_MIN_SLOT_TABLE)
return -ENOMEM;
if (cdata->max_requests > max_qp_wr)
cdata->max_requests = max_qp_wr;
ep->rep_attr.cap.max_send_wr = cdata->max_requests * depth;
if (ep->rep_attr.cap.max_send_wr > max_qp_wr) {
cdata->max_requests = max_qp_wr / depth;
if (!cdata->max_requests)
return -EINVAL;
ep->rep_attr.cap.max_send_wr = cdata->max_requests *
depth;
}
ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
ep->rep_attr.cap.max_send_wr += 1; /* for ib_drain_sq */
ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
ep->rep_attr.cap.max_recv_wr += 1; /* for ib_drain_rq */
ia->ri_max_segs = max_t(unsigned int, 1, RPCRDMA_MAX_DATA_SEGS /
ia->ri_max_frwr_depth);
@ -393,6 +415,7 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
mr->mr_nents = ib_dma_map_sg(ia->ri_device, mr->mr_sg, i, mr->mr_dir);
if (!mr->mr_nents)
goto out_dmamap_err;
trace_xprtrdma_dma_map(mr);
ibmr = frwr->fr_mr;
n = ib_map_mr_sg(ibmr, mr->mr_sg, mr->mr_nents, NULL, PAGE_SIZE);

1
net/sunrpc/xprtrdma/module.c
View File

@ -1,3 +1,4 @@
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (c) 2015, 2017 Oracle. All rights reserved.
*/

66
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@ -1,3 +1,4 @@
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (c) 2014-2017 Oracle. All rights reserved.
* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
@ -54,14 +55,6 @@
# define RPCDBG_FACILITY RPCDBG_TRANS
#endif
static const char transfertypes[][12] = {
"inline", /* no chunks */
"read list", /* some argument via rdma read */
"*read list", /* entire request via rdma read */
"write list", /* some result via rdma write */
"reply chunk" /* entire reply via rdma write */
};
/* Returns size of largest RPC-over-RDMA header in a Call message
*
* The largest Call header contains a full-size Read list and a
@ -230,7 +223,7 @@ rpcrdma_convert_iovs(struct rpcrdma_xprt *r_xprt, struct xdr_buf *xdrbuf,
*/
*ppages = alloc_page(GFP_ATOMIC);
if (!*ppages)
return -EAGAIN;
return -ENOBUFS;
}
seg->mr_page = *ppages;
seg->mr_offset = (char *)page_base;
@ -365,7 +358,7 @@ rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
false, &mr);
if (IS_ERR(seg))
goto out_maperr;
return PTR_ERR(seg);
rpcrdma_mr_push(mr, &req->rl_registered);
if (encode_read_segment(xdr, mr, pos) < 0)
@ -377,11 +370,6 @@ rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
} while (nsegs);
return 0;
out_maperr:
if (PTR_ERR(seg) == -EAGAIN)
xprt_wait_for_buffer_space(rqst->rq_task, NULL);
return PTR_ERR(seg);
}
/* Register and XDR encode the Write list. Supports encoding a list
@ -428,7 +416,7 @@ rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
true, &mr);
if (IS_ERR(seg))
goto out_maperr;
return PTR_ERR(seg);
rpcrdma_mr_push(mr, &req->rl_registered);
if (encode_rdma_segment(xdr, mr) < 0)
@ -445,11 +433,6 @@ rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
*segcount = cpu_to_be32(nchunks);
return 0;
out_maperr:
if (PTR_ERR(seg) == -EAGAIN)
xprt_wait_for_buffer_space(rqst->rq_task, NULL);
return PTR_ERR(seg);
}
/* Register and XDR encode the Reply chunk. Supports encoding an array
@ -491,7 +474,7 @@ rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
true, &mr);
if (IS_ERR(seg))
goto out_maperr;
return PTR_ERR(seg);
rpcrdma_mr_push(mr, &req->rl_registered);
if (encode_rdma_segment(xdr, mr) < 0)
@ -508,11 +491,6 @@ rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
*segcount = cpu_to_be32(nchunks);
return 0;
out_maperr:
if (PTR_ERR(seg) == -EAGAIN)
xprt_wait_for_buffer_space(rqst->rq_task, NULL);
return PTR_ERR(seg);
}
/**
@ -709,7 +687,7 @@ rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt,
{
req->rl_sendctx = rpcrdma_sendctx_get_locked(&r_xprt->rx_buf);
if (!req->rl_sendctx)
return -ENOBUFS;
return -EAGAIN;
req->rl_sendctx->sc_wr.num_sge = 0;
req->rl_sendctx->sc_unmap_count = 0;
req->rl_sendctx->sc_req = req;
@ -883,7 +861,15 @@ rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst)
return 0;
out_err:
r_xprt->rx_stats.failed_marshal_count++;
switch (ret) {
case -EAGAIN:
xprt_wait_for_buffer_space(rqst->rq_task, NULL);
break;
case -ENOBUFS:
break;
default:
r_xprt->rx_stats.failed_marshal_count++;
}
return ret;
}
@ -1026,8 +1012,6 @@ rpcrdma_is_bcall(struct rpcrdma_xprt *r_xprt, struct rpcrdma_rep *rep)
out_short:
pr_warn("RPC/RDMA short backward direction call\n");
if (rpcrdma_ep_post_recv(&r_xprt->rx_ia, rep))
xprt_disconnect_done(&r_xprt->rx_xprt);
return true;
}
#else /* CONFIG_SUNRPC_BACKCHANNEL */
@ -1333,13 +1317,14 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
u32 credits;
__be32 *p;
--buf->rb_posted_receives;
if (rep->rr_hdrbuf.head[0].iov_len == 0)
goto out_badstatus;
/* Fixed transport header fields */
xdr_init_decode(&rep->rr_stream, &rep->rr_hdrbuf,
rep->rr_hdrbuf.head[0].iov_base);
/* Fixed transport header fields */
p = xdr_inline_decode(&rep->rr_stream, 4 * sizeof(*p));
if (unlikely(!p))
goto out_shortreply;
@ -1378,17 +1363,10 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
trace_xprtrdma_reply(rqst->rq_task, rep, req, credits);
rpcrdma_post_recvs(r_xprt, false);
queue_work(rpcrdma_receive_wq, &rep->rr_work);
return;
out_badstatus:
rpcrdma_recv_buffer_put(rep);
if (r_xprt->rx_ep.rep_connected == 1) {
r_xprt->rx_ep.rep_connected = -EIO;
rpcrdma_conn_func(&r_xprt->rx_ep);
}
return;
out_badversion:
trace_xprtrdma_reply_vers(rep);
goto repost;
@ -1408,7 +1386,7 @@ out_shortreply:
* receive buffer before returning.
*/
repost:
r_xprt->rx_stats.bad_reply_count++;
if (rpcrdma_ep_post_recv(&r_xprt->rx_ia, rep))
rpcrdma_recv_buffer_put(rep);
rpcrdma_post_recvs(r_xprt, false);
out_badstatus:
rpcrdma_recv_buffer_put(rep);
}

1
net/sunrpc/xprtrdma/svc_rdma_backchannel.c
View File

@ -273,6 +273,7 @@ static const struct rpc_xprt_ops xprt_rdma_bc_procs = {
.reserve_xprt = xprt_reserve_xprt_cong,
.release_xprt = xprt_release_xprt_cong,
.alloc_slot = xprt_alloc_slot,
.free_slot = xprt_free_slot,
.release_request = xprt_release_rqst_cong,
.buf_alloc = xprt_rdma_bc_allocate,
.buf_free = xprt_rdma_bc_free,

64
net/sunrpc/xprtrdma/transport.c
View File

@ -1,3 +1,4 @@
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (c) 2014-2017 Oracle. All rights reserved.
* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
@ -330,9 +331,7 @@ xprt_setup_rdma(struct xprt_create *args)
return ERR_PTR(-EBADF);
}
xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
xprt_rdma_slot_table_entries,
xprt_rdma_slot_table_entries);
xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 0);
if (xprt == NULL) {
dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
__func__);
@ -364,7 +363,7 @@ xprt_setup_rdma(struct xprt_create *args)
xprt_set_bound(xprt);
xprt_rdma_format_addresses(xprt, sap);
cdata.max_requests = xprt->max_reqs;
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 */
@ -537,6 +536,47 @@ xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
}
}
/**
* xprt_rdma_alloc_slot - allocate an rpc_rqst
* @xprt: controlling RPC transport
* @task: RPC task requesting a fresh rpc_rqst
*
* tk_status values:
* %0 if task->tk_rqstp points to a fresh rpc_rqst
* %-EAGAIN if no rpc_rqst is available; queued on backlog
*/
static void
xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
{
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
struct rpcrdma_req *req;
req = rpcrdma_buffer_get(&r_xprt->rx_buf);
if (!req)
goto out_sleep;
task->tk_rqstp = &req->rl_slot;
task->tk_status = 0;
return;
out_sleep:
rpc_sleep_on(&xprt->backlog, task, NULL);
task->tk_status = -EAGAIN;
}
/**
* xprt_rdma_free_slot - release an rpc_rqst
* @xprt: controlling RPC transport
* @rqst: rpc_rqst to release
*
*/
static void
xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst)
{
memset(rqst, 0, sizeof(*rqst));
rpcrdma_buffer_put(rpcr_to_rdmar(rqst));
rpc_wake_up_next(&xprt->backlog);
}
static bool
rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
size_t size, gfp_t flags)
@ -607,13 +647,9 @@ xprt_rdma_allocate(struct rpc_task *task)
{
struct rpc_rqst *rqst = task->tk_rqstp;
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
struct rpcrdma_req *req;
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
gfp_t flags;
req = rpcrdma_buffer_get(&r_xprt->rx_buf);
if (req == NULL)
goto out_get;
flags = RPCRDMA_DEF_GFP;
if (RPC_IS_SWAPPER(task))
flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
@ -623,15 +659,12 @@ xprt_rdma_allocate(struct rpc_task *task)
if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags))
goto out_fail;
rpcrdma_set_xprtdata(rqst, req);
rqst->rq_buffer = req->rl_sendbuf->rg_base;
rqst->rq_rbuffer = req->rl_recvbuf->rg_base;
trace_xprtrdma_allocate(task, req);
return 0;
out_fail:
rpcrdma_buffer_put(req);
out_get:
trace_xprtrdma_allocate(task, NULL);
return -ENOMEM;
}
@ -652,7 +685,6 @@ xprt_rdma_free(struct rpc_task *task)
if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags))
rpcrdma_release_rqst(r_xprt, req);
trace_xprtrdma_rpc_done(task, req);
rpcrdma_buffer_put(req);
}
/**
@ -690,9 +722,6 @@ xprt_rdma_send_request(struct rpc_task *task)
if (rc < 0)
goto failed_marshal;
if (req->rl_reply == NULL) /* e.g. reconnection */
rpcrdma_recv_buffer_get(req);
/* Must suppress retransmit to maintain credits */
if (rqst->rq_connect_cookie == xprt->connect_cookie)
goto drop_connection;
@ -779,7 +808,8 @@ xprt_rdma_disable_swap(struct rpc_xprt *xprt)
static const struct rpc_xprt_ops xprt_rdma_procs = {
.reserve_xprt = xprt_reserve_xprt_cong,
.release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
.alloc_slot = xprt_alloc_slot,
.alloc_slot = xprt_rdma_alloc_slot,
.free_slot = xprt_rdma_free_slot,
.release_request = xprt_release_rqst_cong, /* ditto */
.set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
.timer = xprt_rdma_timer,

291
net/sunrpc/xprtrdma/verbs.c
View File

@ -1,3 +1,4 @@
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (c) 2014-2017 Oracle. All rights reserved.
* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
@ -71,8 +72,10 @@
/*
* internal functions
*/
static void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc);
static void rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt);
static void rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf);
static int rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt, bool temp);
static void rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb);
struct workqueue_struct *rpcrdma_receive_wq __read_mostly;
@ -159,7 +162,7 @@ rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
rr_cqe);
/* WARNING: Only wr_id and status are reliable at this point */
trace_xprtrdma_wc_receive(rep, wc);
trace_xprtrdma_wc_receive(wc);
if (wc->status != IB_WC_SUCCESS)
goto out_fail;
@ -231,7 +234,7 @@ rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
complete(&ia->ri_done);
break;
case RDMA_CM_EVENT_ADDR_ERROR:
ia->ri_async_rc = -EHOSTUNREACH;
ia->ri_async_rc = -EPROTO;
complete(&ia->ri_done);
break;
case RDMA_CM_EVENT_ROUTE_ERROR:
@ -262,7 +265,7 @@ rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
connstate = -ENOTCONN;
goto connected;
case RDMA_CM_EVENT_UNREACHABLE:
connstate = -ENETDOWN;
connstate = -ENETUNREACH;
goto connected;
case RDMA_CM_EVENT_REJECTED:
dprintk("rpcrdma: connection to %s:%s rejected: %s\n",
@ -305,8 +308,8 @@ rpcrdma_create_id(struct rpcrdma_xprt *xprt, struct rpcrdma_ia *ia)
init_completion(&ia->ri_done);
init_completion(&ia->ri_remove_done);
id = rdma_create_id(&init_net, rpcrdma_conn_upcall, xprt, RDMA_PS_TCP,
IB_QPT_RC);
id = rdma_create_id(xprt->rx_xprt.xprt_net, rpcrdma_conn_upcall,
xprt, RDMA_PS_TCP, IB_QPT_RC);
if (IS_ERR(id)) {
rc = PTR_ERR(id);
dprintk("RPC: %s: rdma_create_id() failed %i\n",
@ -500,8 +503,8 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
struct rpcrdma_create_data_internal *cdata)
{
struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private;
unsigned int max_qp_wr, max_sge;
struct ib_cq *sendcq, *recvcq;
unsigned int max_sge;
int rc;
max_sge = min_t(unsigned int, ia->ri_device->attrs.max_sge,
@ -512,29 +515,13 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
}
ia->ri_max_send_sges = max_sge;
if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) {
dprintk("RPC: %s: insufficient wqe's available\n",
__func__);
return -ENOMEM;
}
max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1;
/* check provider's send/recv wr limits */
if (cdata->max_requests > max_qp_wr)
cdata->max_requests = max_qp_wr;
rc = ia->ri_ops->ro_open(ia, ep, cdata);
if (rc)
return rc;
ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
ep->rep_attr.qp_context = ep;
ep->rep_attr.srq = NULL;
ep->rep_attr.cap.max_send_wr = cdata->max_requests;
ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */
rc = ia->ri_ops->ro_open(ia, ep, cdata);
if (rc)
return rc;
ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */
ep->rep_attr.cap.max_send_sge = max_sge;
ep->rep_attr.cap.max_recv_sge = 1;
ep->rep_attr.cap.max_inline_data = 0;
@ -741,7 +728,6 @@ rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
{
struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,
rx_ia);
unsigned int extras;
int rc;
retry:
@ -785,9 +771,8 @@ retry:
}
dprintk("RPC: %s: connected\n", __func__);
extras = r_xprt->rx_buf.rb_bc_srv_max_requests;
if (extras)
rpcrdma_ep_post_extra_recv(r_xprt, extras);
rpcrdma_post_recvs(r_xprt, true);
out:
if (rc)
@ -893,6 +878,7 @@ static int rpcrdma_sendctxs_create(struct rpcrdma_xprt *r_xprt)
sc->sc_xprt = r_xprt;
buf->rb_sc_ctxs[i] = sc;
}
buf->rb_flags = 0;
return 0;
@ -950,7 +936,7 @@ out_emptyq:
* completions recently. This is a sign the Send Queue is
* backing up. Cause the caller to pause and try again.
*/
dprintk("RPC: %s: empty sendctx queue\n", __func__);
set_bit(RPCRDMA_BUF_F_EMPTY_SCQ, &buf->rb_flags);
r_xprt = container_of(buf, struct rpcrdma_xprt, rx_buf);
r_xprt->rx_stats.empty_sendctx_q++;
return NULL;
@ -965,7 +951,8 @@ out_emptyq:
*
* The caller serializes calls to this function (per rpcrdma_buffer).
*/
void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc)
static void
rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc)
{
struct rpcrdma_buffer *buf = &sc->sc_xprt->rx_buf;
unsigned long next_tail;
@ -984,6 +971,11 @@ void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc)
/* Paired with READ_ONCE */
smp_store_release(&buf->rb_sc_tail, next_tail);
if (test_and_clear_bit(RPCRDMA_BUF_F_EMPTY_SCQ, &buf->rb_flags)) {
smp_mb__after_atomic();
xprt_write_space(&sc->sc_xprt->rx_xprt);
}
}
static void
@ -1097,14 +1089,8 @@ rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
return req;
}
/**
* rpcrdma_create_rep - Allocate an rpcrdma_rep object
* @r_xprt: controlling transport
*
* Returns 0 on success or a negative errno on failure.
*/
int
rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
static int
rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt, bool temp)
{
struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
@ -1132,6 +1118,7 @@ rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
rep->rr_recv_wr.wr_cqe = &rep->rr_cqe;
rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
rep->rr_recv_wr.num_sge = 1;
rep->rr_temp = temp;
spin_lock(&buf->rb_lock);
list_add(&rep->rr_list, &buf->rb_recv_bufs);
@ -1183,12 +1170,8 @@ rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
list_add(&req->rl_list, &buf->rb_send_bufs);
}
buf->rb_posted_receives = 0;
INIT_LIST_HEAD(&buf->rb_recv_bufs);
for (i = 0; i <= buf->rb_max_requests; i++) {
rc = rpcrdma_create_rep(r_xprt);
if (rc)
goto out;
}
rc = rpcrdma_sendctxs_create(r_xprt);
if (rc)
@ -1200,28 +1183,6 @@ out:
return rc;
}
static struct rpcrdma_req *
rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf)
{
struct rpcrdma_req *req;
req = list_first_entry(&buf->rb_send_bufs,
struct rpcrdma_req, rl_list);
list_del_init(&req->rl_list);
return req;
}
static struct rpcrdma_rep *
rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer *buf)
{
struct rpcrdma_rep *rep;
rep = list_first_entry(&buf->rb_recv_bufs,
struct rpcrdma_rep, rr_list);
list_del(&rep->rr_list);
return rep;
}
static void
rpcrdma_destroy_rep(struct rpcrdma_rep *rep)
{
@ -1280,10 +1241,11 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
while (!list_empty(&buf->rb_recv_bufs)) {
struct rpcrdma_rep *rep;
rep = rpcrdma_buffer_get_rep_locked(buf);
rep = list_first_entry(&buf->rb_recv_bufs,
struct rpcrdma_rep, rr_list);
list_del(&rep->rr_list);
rpcrdma_destroy_rep(rep);
}
buf->rb_send_count = 0;
spin_lock(&buf->rb_reqslock);
while (!list_empty(&buf->rb_allreqs)) {
@ -1298,7 +1260,6 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
spin_lock(&buf->rb_reqslock);
}
spin_unlock(&buf->rb_reqslock);
buf->rb_recv_count = 0;
rpcrdma_mrs_destroy(buf);
}
@ -1371,27 +1332,11 @@ rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr)
__rpcrdma_mr_put(&r_xprt->rx_buf, mr);
}
static struct rpcrdma_rep *
rpcrdma_buffer_get_rep(struct rpcrdma_buffer *buffers)
{
/* If an RPC previously completed without a reply (say, a
* credential problem or a soft timeout occurs) then hold off
* on supplying more Receive buffers until the number of new
* pending RPCs catches up to the number of posted Receives.
*/
if (unlikely(buffers->rb_send_count < buffers->rb_recv_count))
return NULL;
if (unlikely(list_empty(&buffers->rb_recv_bufs)))
return NULL;
buffers->rb_recv_count++;
return rpcrdma_buffer_get_rep_locked(buffers);
}
/*
* Get a set of request/reply buffers.
/**
* rpcrdma_buffer_get - Get a request buffer
* @buffers: Buffer pool from which to obtain a buffer
*
* Reply buffer (if available) is attached to send buffer upon return.
* Returns a fresh rpcrdma_req, or NULL if none are available.
*/
struct rpcrdma_req *
rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
@ -1399,23 +1344,18 @@ rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
struct rpcrdma_req *req;
spin_lock(&buffers->rb_lock);
if (list_empty(&buffers->rb_send_bufs))
goto out_reqbuf;
buffers->rb_send_count++;
req = rpcrdma_buffer_get_req_locked(buffers);
req->rl_reply = rpcrdma_buffer_get_rep(buffers);
req = list_first_entry_or_null(&buffers->rb_send_bufs,
struct rpcrdma_req, rl_list);
if (req)
list_del_init(&req->rl_list);
spin_unlock(&buffers->rb_lock);
return req;
out_reqbuf:
spin_unlock(&buffers->rb_lock);
return NULL;
}
/*
* Put request/reply buffers back into pool.
* Pre-decrement counter/array index.
/**
* rpcrdma_buffer_put - Put request/reply buffers back into pool
* @req: object to return
*
*/
void
rpcrdma_buffer_put(struct rpcrdma_req *req)
@ -1426,27 +1366,16 @@ rpcrdma_buffer_put(struct rpcrdma_req *req)
req->rl_reply = NULL;
spin_lock(&buffers->rb_lock);
buffers->rb_send_count--;
list_add_tail(&req->rl_list, &buffers->rb_send_bufs);
list_add(&req->rl_list, &buffers->rb_send_bufs);
if (rep) {
buffers->rb_recv_count--;
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
if (!rep->rr_temp) {
list_add(&rep->rr_list, &buffers->rb_recv_bufs);
rep = NULL;
}
}
spin_unlock(&buffers->rb_lock);
}
/*
* Recover reply buffers from pool.
* This happens when recovering from disconnect.
*/
void
rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
{
struct rpcrdma_buffer *buffers = req->rl_buffer;
spin_lock(&buffers->rb_lock);
req->rl_reply = rpcrdma_buffer_get_rep(buffers);
spin_unlock(&buffers->rb_lock);
if (rep)
rpcrdma_destroy_rep(rep);
}
/*
@ -1458,10 +1387,13 @@ rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
{
struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
spin_lock(&buffers->rb_lock);
buffers->rb_recv_count--;
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
spin_unlock(&buffers->rb_lock);
if (!rep->rr_temp) {
spin_lock(&buffers->rb_lock);
list_add(&rep->rr_list, &buffers->rb_recv_bufs);
spin_unlock(&buffers->rb_lock);
} else {
rpcrdma_destroy_rep(rep);
}
}
/**
@ -1557,13 +1489,6 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
struct ib_send_wr *send_wr = &req->rl_sendctx->sc_wr;
int rc;
if (req->rl_reply) {
rc = rpcrdma_ep_post_recv(ia, req->rl_reply);
if (rc)
return rc;
req->rl_reply = NULL;
}
if (!ep->rep_send_count ||
test_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags)) {
send_wr->send_flags |= IB_SEND_SIGNALED;
@ -1580,61 +1505,69 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
return 0;
}
int
rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
struct rpcrdma_rep *rep)
{
struct ib_recv_wr *recv_wr_fail;
int rc;
if (!rpcrdma_dma_map_regbuf(ia, rep->rr_rdmabuf))
goto out_map;
rc = ib_post_recv(ia->ri_id->qp, &rep->rr_recv_wr, &recv_wr_fail);
trace_xprtrdma_post_recv(rep, rc);
if (rc)
return -ENOTCONN;
return 0;
out_map:
pr_err("rpcrdma: failed to DMA map the Receive buffer\n");
return -EIO;
}
/**
* rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests
* @r_xprt: transport associated with these backchannel resources
* @count: minimum number of incoming requests expected
* rpcrdma_post_recvs - Maybe post some Receive buffers
* @r_xprt: controlling transport
* @temp: when true, allocate temp rpcrdma_rep objects
*
* Returns zero if all requested buffers were posted, or a negative errno.
*/
int
rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *r_xprt, unsigned int count)
void
rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
{
struct rpcrdma_buffer *buffers = &r_xprt->rx_buf;
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct rpcrdma_rep *rep;
int rc;
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
struct ib_recv_wr *wr, *bad_wr;
int needed, count, rc;
while (count--) {
spin_lock(&buffers->rb_lock);
if (list_empty(&buffers->rb_recv_bufs))
goto out_reqbuf;
rep = rpcrdma_buffer_get_rep_locked(buffers);
spin_unlock(&buffers->rb_lock);
needed = buf->rb_credits + (buf->rb_bc_srv_max_requests << 1);
if (buf->rb_posted_receives > needed)
return;
needed -= buf->rb_posted_receives;
rc = rpcrdma_ep_post_recv(ia, rep);
if (rc)
goto out_rc;
count = 0;
wr = NULL;
while (needed) {
struct rpcrdma_regbuf *rb;
struct rpcrdma_rep *rep;
spin_lock(&buf->rb_lock);
rep = list_first_entry_or_null(&buf->rb_recv_bufs,
struct rpcrdma_rep, rr_list);
if (likely(rep))
list_del(&rep->rr_list);
spin_unlock(&buf->rb_lock);
if (!rep) {
if (rpcrdma_create_rep(r_xprt, temp))
break;
continue;
}
rb = rep->rr_rdmabuf;
if (!rpcrdma_regbuf_is_mapped(rb)) {
if (!__rpcrdma_dma_map_regbuf(&r_xprt->rx_ia, rb)) {
rpcrdma_recv_buffer_put(rep);
break;
}
}
trace_xprtrdma_post_recv(rep->rr_recv_wr.wr_cqe);
rep->rr_recv_wr.next = wr;
wr = &rep->rr_recv_wr;
++count;
--needed;
}
if (!count)
return;
return 0;
rc = ib_post_recv(r_xprt->rx_ia.ri_id->qp, wr, &bad_wr);
if (rc) {
for (wr = bad_wr; wr; wr = wr->next) {
struct rpcrdma_rep *rep;
out_reqbuf:
spin_unlock(&buffers->rb_lock);
trace_xprtrdma_noreps(r_xprt);
return -ENOMEM;
out_rc:
rpcrdma_recv_buffer_put(rep);
return rc;
rep = container_of(wr, struct rpcrdma_rep, rr_recv_wr);
rpcrdma_recv_buffer_put(rep);
--count;
}
}
buf->rb_posted_receives += count;
trace_xprtrdma_post_recvs(r_xprt, count, rc);
}

26
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -1,3 +1,4 @@
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/*
* Copyright (c) 2014-2017 Oracle. All rights reserved.
* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
@ -196,6 +197,7 @@ struct rpcrdma_rep {
__be32 rr_proc;
int rr_wc_flags;
u32 rr_inv_rkey;
bool rr_temp;
struct rpcrdma_regbuf *rr_rdmabuf;
struct rpcrdma_xprt *rr_rxprt;
struct work_struct rr_work;
@ -334,6 +336,7 @@ enum {
struct rpcrdma_buffer;
struct rpcrdma_req {
struct list_head rl_list;
struct rpc_rqst rl_slot;
struct rpcrdma_buffer *rl_buffer;
struct rpcrdma_rep *rl_reply;
struct xdr_stream rl_stream;
@ -356,16 +359,10 @@ enum {
RPCRDMA_REQ_F_TX_RESOURCES,
};
static inline void
rpcrdma_set_xprtdata(struct rpc_rqst *rqst, struct rpcrdma_req *req)
{
rqst->rq_xprtdata = req;
}
static inline struct rpcrdma_req *
rpcr_to_rdmar(const struct rpc_rqst *rqst)
{
return rqst->rq_xprtdata;
return container_of(rqst, struct rpcrdma_req, rl_slot);
}
static inline void
@ -401,11 +398,12 @@ struct rpcrdma_buffer {
struct rpcrdma_sendctx **rb_sc_ctxs;
spinlock_t rb_lock; /* protect buf lists */
int rb_send_count, rb_recv_count;
struct list_head rb_send_bufs;
struct list_head rb_recv_bufs;
unsigned long rb_flags;
u32 rb_max_requests;
u32 rb_credits; /* most recent credit grant */
int rb_posted_receives;
u32 rb_bc_srv_max_requests;
spinlock_t rb_reqslock; /* protect rb_allreqs */
@ -420,6 +418,11 @@ struct rpcrdma_buffer {
};
#define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
/* rb_flags */
enum {
RPCRDMA_BUF_F_EMPTY_SCQ = 0,
};
/*
* Internal structure for transport instance creation. This
* exists primarily for modularity.
@ -561,18 +564,16 @@ void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
struct rpcrdma_req *);
int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_rep *);
void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp);
/*
* Buffer calls - xprtrdma/verbs.c
*/
struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *);
void rpcrdma_destroy_req(struct rpcrdma_req *);
int rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt);
int rpcrdma_buffer_create(struct rpcrdma_xprt *);
void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf);
void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc);
struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
void rpcrdma_mr_put(struct rpcrdma_mr *mr);
@ -581,7 +582,6 @@ void rpcrdma_mr_defer_recovery(struct rpcrdma_mr *mr);
struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
void rpcrdma_buffer_put(struct rpcrdma_req *);
void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction,
@ -603,8 +603,6 @@ rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
return __rpcrdma_dma_map_regbuf(ia, rb);
}
int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int);
int rpcrdma_alloc_wq(void);
void rpcrdma_destroy_wq(void);

4
net/sunrpc/xprtsock.c
View File

@ -2763,6 +2763,7 @@ static const struct rpc_xprt_ops xs_local_ops = {
.reserve_xprt = xprt_reserve_xprt,
.release_xprt = xs_tcp_release_xprt,
.alloc_slot = xprt_alloc_slot,
.free_slot = xprt_free_slot,
.rpcbind = xs_local_rpcbind,
.set_port = xs_local_set_port,
.connect = xs_local_connect,
@ -2782,6 +2783,7 @@ static const struct rpc_xprt_ops xs_udp_ops = {
.reserve_xprt = xprt_reserve_xprt_cong,
.release_xprt = xprt_release_xprt_cong,
.alloc_slot = xprt_alloc_slot,
.free_slot = xprt_free_slot,
.rpcbind = rpcb_getport_async,
.set_port = xs_set_port,
.connect = xs_connect,
@ -2803,6 +2805,7 @@ static const struct rpc_xprt_ops xs_tcp_ops = {
.reserve_xprt = xprt_reserve_xprt,
.release_xprt = xs_tcp_release_xprt,
.alloc_slot = xprt_lock_and_alloc_slot,
.free_slot = xprt_free_slot,
.rpcbind = rpcb_getport_async,
.set_port = xs_set_port,
.connect = xs_connect,
@ -2834,6 +2837,7 @@ static const struct rpc_xprt_ops bc_tcp_ops = {
.reserve_xprt = xprt_reserve_xprt,
.release_xprt = xprt_release_xprt,
.alloc_slot = xprt_alloc_slot,
.free_slot = xprt_free_slot,
.buf_alloc = bc_malloc,
.buf_free = bc_free,
.send_request = bc_send_request,