/*
* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the BSD-type
* license below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* Neither the name of the Network Appliance, Inc. nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* verbs.c
*
* Encapsulates the major functions managing:
* o adapters
* o endpoints
* o connections
* o buffer memory
*/
#include <linux/pci.h> /* for Tavor hack below */
#include "xprt_rdma.h"
/*
* Globals/Macros
*/
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_TRANS
#endif
/*
* internal functions
*/
/*
* handle replies in tasklet context, using a single, global list
* rdma tasklet function -- just turn around and call the func
* for all replies on the list
*/
static DEFINE_SPINLOCK(rpcrdma_tk_lock_g);
static LIST_HEAD(rpcrdma_tasklets_g);
static void
rpcrdma_run_tasklet(unsigned long data)
{
struct rpcrdma_rep *rep;
void (*func)(struct rpcrdma_rep *);
unsigned long flags;
data = data;
spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
while (!list_empty(&rpcrdma_tasklets_g)) {
rep = list_entry(rpcrdma_tasklets_g.next,
struct rpcrdma_rep, rr_list);
list_del(&rep->rr_list);
func = rep->rr_func;
rep->rr_func = NULL;
spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
if (func)
func(rep);
else
rpcrdma_recv_buffer_put(rep);
spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
}
spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
}
static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL);
static inline void
rpcrdma_schedule_tasklet(struct rpcrdma_rep *rep)
{
unsigned long flags;
spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
list_add_tail(&rep->rr_list, &rpcrdma_tasklets_g);
spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
tasklet_schedule(&rpcrdma_tasklet_g);
}
static void
rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
{
struct rpcrdma_ep *ep = context;
dprintk("RPC: %s: QP error %X on device %s ep %p\n",
__func__, event->event, event->device->name, context);
if (ep->rep_connected == 1) {
ep->rep_connected = -EIO;
ep->rep_func(ep);
wake_up_all(&ep->rep_connect_wait);
}
}
static void
rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context)
{
struct rpcrdma_ep *ep = context;
dprintk("RPC: %s: CQ error %X on device %s ep %p\n",
__func__, event->event, event->device->name, context);
if (ep->rep_connected == 1) {
ep->rep_connected = -EIO;
ep->rep_func(ep);
wake_up_all(&ep->rep_connect_wait);
}
}
static inline
void rpcrdma_event_process(struct ib_wc *wc)
{
struct rpcrdma_rep *rep =
(struct rpcrdma_rep *)(unsigned long) wc->wr_id;
dprintk("RPC: %s: event rep %p status %X opcode %X length %u\n",
__func__, rep, wc->status, wc->opcode, wc->byte_len);
if (!rep) /* send or bind completion that we don't care about */
return;
if (IB_WC_SUCCESS != wc->status) {
dprintk("RPC: %s: %s WC status %X, connection lost\n",
__func__, (wc->opcode & IB_WC_RECV) ? "recv" : "send",
wc->status);
rep->rr_len = ~0U;
rpcrdma_schedule_tasklet(rep);
return;
}
switch (wc->opcode) {
case IB_WC_RECV:
rep->rr_len = wc->byte_len;
ib_dma_sync_single_for_cpu(
rdmab_to_ia(rep->rr_buffer)->ri_id->device,
rep->rr_iov.addr, rep->rr_len, DMA_FROM_DEVICE);
/* Keep (only) the most recent credits, after check validity */
if (rep->rr_len >= 16) {
struct rpcrdma_msg *p =
(struct rpcrdma_msg *) rep->rr_base;
unsigned int credits = ntohl(p->rm_credit);
if (credits == 0) {
dprintk("RPC: %s: server"
" dropped credits to 0!\n", __func__);
/* don't deadlock */
credits = 1;
} else if (credits > rep->rr_buffer->rb_max_requests) {
dprintk("RPC: %s: server"
" over-crediting: %d (%d)\n",
__func__, credits,
rep->rr_buffer->rb_max_requests);
credits = rep->rr_buffer->rb_max_requests;
}
atomic_set(&rep->rr_buffer->rb_credits, credits);
}
/* fall through */
case IB_WC_BIND_MW:
rpcrdma_schedule_tasklet(rep);
break;
default:
dprintk("RPC: %s: unexpected WC event %X\n",
__func__, wc->opcode);
break;
}
}
static inline int
rpcrdma_cq_poll(struct ib_cq *cq)
{
struct ib_wc wc;
int rc;
for (;;) {
rc = ib_poll_cq(cq, 1, &wc);
if (rc < 0) {
dprintk("RPC: %s: ib_poll_cq failed %i\n",
__func__, rc);
return rc;
}
if (rc == 0)
break;
rpcrdma_event_process(&wc);
}
return 0;
}
/*
* rpcrdma_cq_event_upcall
*
* This upcall handles recv, send, bind and unbind events.
* It is reentrant but processes single events in order to maintain
* ordering of receives to keep server credits.
*
* It is the responsibility of the scheduled tasklet to return
* recv buffers to the pool. NOTE: this affects synchronization of
* connection shutdown. That is, the structures required for
* the completion of the reply handler must remain intact until
* all memory has been reclaimed.
*
* Note that send events are suppressed and do not result in an upcall.
*/
static void
rpcrdma_cq_event_upcall(struct ib_cq *cq, void *context)
{
int rc;
rc = rpcrdma_cq_poll(cq);
if (rc)
return;
rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
if (rc) {
dprintk("RPC: %s: ib_req_notify_cq failed %i\n",
__func__, rc);
return;
}
rpcrdma_cq_poll(cq);
}
#ifdef RPC_DEBUG
static const char * const conn[] = {
"address resolved",
"address error",
"route resolved",
"route error",
"connect request",
"connect response",
"connect error",
"unreachable",
"rejected",
"established",
"disconnected",
"device removal"
};
#endif
static int
rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
{
struct rpcrdma_xprt *xprt = id->context;
struct rpcrdma_ia *ia = &xprt->rx_ia;
struct rpcrdma_ep *ep = &xprt->rx_ep;
struct sockaddr_in *addr = (struct sockaddr_in *) &ep->rep_remote_addr;
struct ib_qp_attr attr;
struct ib_qp_init_attr iattr;
int connstate = 0;
switch (event->event) {
case RDMA_CM_EVENT_ADDR_RESOLVED:
case RDMA_CM_EVENT_ROUTE_RESOLVED:
complete(&ia->ri_done);
break;
case RDMA_CM_EVENT_ADDR_ERROR:
ia->ri_async_rc = -EHOSTUNREACH;
dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
__func__, ep);
complete(&ia->ri_done);
break;
case RDMA_CM_EVENT_ROUTE_ERROR:
ia->ri_async_rc = -ENETUNREACH;
dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
__func__, ep);
complete(&ia->ri_done);
break;
case RDMA_CM_EVENT_ESTABLISHED:
connstate = 1;
ib_query_qp(ia->ri_id->qp, &attr,
IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
&iattr);
dprintk("RPC: %s: %d responder resources"
" (%d initiator)\n",
__func__, attr.max_dest_rd_atomic, attr.max_rd_atomic);
goto connected;
case RDMA_CM_EVENT_CONNECT_ERROR:
connstate = -ENOTCONN;
goto connected;
case RDMA_CM_EVENT_UNREACHABLE:
connstate = -ENETDOWN;
goto connected;
case RDMA_CM_EVENT_REJECTED:
connstate = -ECONNREFUSED;
goto connected;
case RDMA_CM_EVENT_DISCONNECTED:
connstate = -ECONNABORTED;
goto connected;
case RDMA_CM_EVENT_DEVICE_REMOVAL:
connstate = -ENODEV;
connected:
dprintk("RPC: %s: %s: %u.%u.%u.%u:%u"
" (ep 0x%p event 0x%x)\n",
__func__,
(event->event <= 11) ? conn[event->event] :
"unknown connection error",
NIPQUAD(addr->sin_addr.s_addr),
ntohs(addr->sin_port),
ep, event->event);
atomic_set(&rpcx_to_rdmax(ep->rep_xprt)->rx_buf.rb_credits, 1);
dprintk("RPC: %s: %sconnected\n",
__func__, connstate > 0 ? "" : "dis");
ep->rep_connected = connstate;
ep->rep_func(ep);
wake_up_all(&ep->rep_connect_wait);
break;
default:
ia->ri_async_rc = -EINVAL;
dprintk("RPC: %s: unexpected CM event %X\n",
__func__, event->event);
complete(&ia->ri_done);
break;
}
return 0;
}
static struct rdma_cm_id *
rpcrdma_create_id(struct rpcrdma_xprt *xprt,
struct rpcrdma_ia *ia, struct sockaddr *addr)
{
struct rdma_cm_id *id;
int rc;
id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP);
if (IS_ERR(id)) {
rc = PTR_ERR(id);
dprintk("RPC: %s: rdma_create_id() failed %i\n",
__func__, rc);
return id;
}
ia->ri_async_rc = 0;
rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT);
if (rc) {
dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
__func__, rc);
goto out;
}
wait_for_completion(&ia->ri_done);
rc = ia->ri_async_rc;
if (rc)
goto out;
ia->ri_async_rc = 0;
rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
if (rc) {
dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
__func__, rc);
goto out;
}
wait_for_completion(&ia->ri_done);
rc = ia->ri_async_rc;
if (rc)
goto out;
return id;
out:
rdma_destroy_id(id);
return ERR_PTR(rc);
}
/*
* Drain any cq, prior to teardown.
*/
static void
rpcrdma_clean_cq(struct ib_cq *cq)
{
struct ib_wc wc;
int count = 0;
while (1 == ib_poll_cq(cq, 1, &wc))
++count;
if (count)
dprintk("RPC: %s: flushed %d events (last 0x%x)\n",
__func__, count, wc.opcode);
}
/*
* Exported functions.
*/
/*
* Open and initialize an Interface Adapter.
* o initializes fields of struct rpcrdma_ia, including
* interface and provider attributes and protection zone.
*/
int
rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
{
int rc;
struct rpcrdma_ia *ia = &xprt->rx_ia;
init_completion(&ia->ri_done);
ia->ri_id = rpcrdma_create_id(xprt, ia, addr);
if (IS_ERR(ia->ri_id)) {
rc = PTR_ERR(ia->ri_id);
goto out1;
}
ia->ri_pd = ib_alloc_pd(ia->ri_id->device);
if (IS_ERR(ia->ri_pd)) {
rc = PTR_ERR(ia->ri_pd);
dprintk("RPC: %s: ib_alloc_pd() failed %i\n",
__func__, rc);
goto out2;
}
/*
* Optionally obtain an underlying physical identity mapping in
* order to do a memory window-based bind. This base registration
* is protected from remote access - that is enabled only by binding
* for the specific bytes targeted during each RPC operation, and
* revoked after the corresponding completion similar to a storage
* adapter.
*/
if (memreg > RPCRDMA_REGISTER) {
int mem_priv = IB_ACCESS_LOCAL_WRITE;
switch (memreg) {
#if RPCRDMA_PERSISTENT_REGISTRATION
case RPCRDMA_ALLPHYSICAL:
mem_priv |= IB_ACCESS_REMOTE_WRITE;
mem_priv |= IB_ACCESS_REMOTE_READ;
break;
#endif
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
mem_priv |= IB_ACCESS_MW_BIND;
break;
default:
break;
}
ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv);
if (IS_ERR(ia->ri_bind_mem)) {
printk(KERN_ALERT "%s: ib_get_dma_mr for "
"phys register failed with %lX\n\t"
"Will continue with degraded performance\n",
__func__, PTR_ERR(ia->ri_bind_mem));
memreg = RPCRDMA_REGISTER;
ia->ri_bind_mem = NULL;
}
}
/* Else will do memory reg/dereg for each chunk */
ia->ri_memreg_strategy = memreg;
return 0;
out2:
rdma_destroy_id(ia->ri_id);
out1:
return rc;
}
/*
* Clean up/close an IA.
* o if event handles and PD have been initialized, free them.
* o close the IA
*/
void
rpcrdma_ia_close(struct rpcrdma_ia *ia)
{
int rc;
dprintk("RPC: %s: entering\n", __func__);
if (ia->ri_bind_mem != NULL) {
rc = ib_dereg_mr(ia->ri_bind_mem);
dprintk("RPC: %s: ib_dereg_mr returned %i\n",
__func__, rc);
}
if (ia->ri_id != NULL && !IS_ERR(ia->ri_id) && ia->ri_id->qp)
rdma_destroy_qp(ia->ri_id);
if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) {
rc = ib_dealloc_pd(ia->ri_pd);
dprintk("RPC: %s: ib_dealloc_pd returned %i\n",
__func__, rc);
}
if (ia->ri_id != NULL && !IS_ERR(ia->ri_id))
rdma_destroy_id(ia->ri_id);
}
/*
* Create unconnected endpoint.
*/
int
rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
struct rpcrdma_create_data_internal *cdata)
{
struct ib_device_attr devattr;
int rc;
rc = ib_query_device(ia->ri_id->device, &devattr);
if (rc) {
dprintk("RPC: %s: ib_query_device failed %d\n",
__func__, rc);
return rc;
}
/* check provider's send/recv wr limits */
if (cdata->max_requests > devattr.max_qp_wr)
cdata->max_requests = devattr.max_qp_wr;
ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
ep->rep_attr.qp_context = ep;
/* send_cq and recv_cq initialized below */
ep->rep_attr.srq = NULL;
ep->rep_attr.cap.max_send_wr = cdata->max_requests;
switch (ia->ri_memreg_strategy) {
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
/* Add room for mw_binds+unbinds - overkill! */
ep->rep_attr.cap.max_send_wr++;
ep->rep_attr.cap.max_send_wr *= (2 * RPCRDMA_MAX_SEGS);
if (ep->rep_attr.cap.max_send_wr > devattr.max_qp_wr)
return -EINVAL;
break;
default:
break;
}
ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2);
ep->rep_attr.cap.max_recv_sge = 1;
ep->rep_attr.cap.max_inline_data = 0;
ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
ep->rep_attr.qp_type = IB_QPT_RC;
ep->rep_attr.port_num = ~0;
dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
"iovs: send %d recv %d\n",
__func__,
ep->rep_attr.cap.max_send_wr,
ep->rep_attr.cap.max_recv_wr,
ep->rep_attr.cap.max_send_sge,
ep->rep_attr.cap.max_recv_sge);
/* set trigger for requesting send completion */
ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 /* - 1*/;
switch (ia->ri_memreg_strategy) {
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
ep->rep_cqinit -= RPCRDMA_MAX_SEGS;
break;
default:
break;
}
if (ep->rep_cqinit <= 2)
ep->rep_cqinit = 0;
INIT_CQCOUNT(ep);
ep->rep_ia = ia;
init_waitqueue_head(&ep->rep_connect_wait);
/*
* Create a single cq for receive dto and mw_bind (only ever
* care about unbind, really). Send completions are suppressed.
* Use single threaded tasklet upcalls to maintain ordering.
*/
ep->rep_cq = ib_create_cq(ia->ri_id->device, rpcrdma_cq_event_upcall,
rpcrdma_cq_async_error_upcall, NULL,
ep->rep_attr.cap.max_recv_wr +
ep->rep_attr.cap.max_send_wr + 1, 0);
if (IS_ERR(ep->rep_cq)) {
rc = PTR_ERR(ep->rep_cq);
dprintk("RPC: %s: ib_create_cq failed: %i\n",
__func__, rc);
goto out1;
}
rc = ib_req_notify_cq(ep->rep_cq, IB_CQ_NEXT_COMP);
if (rc) {
dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
__func__, rc);
goto out2;
}
ep->rep_attr.send_cq = ep->rep_cq;
ep->rep_attr.recv_cq = ep->rep_cq;
/* Initialize cma parameters */
/* RPC/RDMA does not use private data */
ep->rep_remote_cma.private_data = NULL;
ep->rep_remote_cma.private_data_len = 0;
/* Client offers RDMA Read but does not initiate */
switch (ia->ri_memreg_strategy) {
case RPCRDMA_BOUNCEBUFFERS:
ep->rep_remote_cma.responder_resources = 0;
break;
case RPCRDMA_MTHCAFMR:
case RPCRDMA_REGISTER:
ep->rep_remote_cma.responder_resources = cdata->max_requests *
(RPCRDMA_MAX_DATA_SEGS / 8);
break;
case RPCRDMA_MEMWINDOWS:
case RPCRDMA_MEMWINDOWS_ASYNC:
#if RPCRDMA_PERSISTENT_REGISTRATION
case RPCRDMA_ALLPHYSICAL:
#endif
ep->rep_remote_cma.responder_resources = cdata->max_requests *
(RPCRDMA_MAX_DATA_SEGS / 2);
break;
default:
break;
}
if (ep->rep_remote_cma.responder_resources > devattr.max_qp_rd_atom)
ep->rep_remote_cma.responder_resources = devattr.max_qp_rd_atom;
ep->rep_remote_cma.initiator_depth = 0;
ep->rep_remote_cma.retry_count = 7;
ep->rep_remote_cma.flow_control = 0;
ep->rep_remote_cma.rnr_retry_count = 0;
return 0;
out2:
if (ib_destroy_cq(ep->rep_cq))
;
out1:
return rc;
}
/*
* rpcrdma_ep_destroy
*
* Disconnect and destroy endpoint. After this, the only
* valid operations on the ep are to free it (if dynamically
* allocated) or re-create it.
*
* The caller's error handling must be sure to not leak the endpoint
* if this function fails.
*/
int
rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
{
int rc;
dprintk("RPC: %s: entering, connected is %d\n",
__func__, ep->rep_connected);
if (ia->ri_id->qp) {
rc = rpcrdma_ep_disconnect(ep, ia);
if (rc)
dprintk("RPC: %s: rpcrdma_ep_disconnect"
" returned %i\n", __func__, rc);
}
ep->rep_func = NULL;
/* padding - could be done in rpcrdma_buffer_destroy... */
if (ep->rep_pad_mr) {
rpcrdma_deregister_internal(ia, ep->rep_pad_mr, &ep->rep_pad);
ep->rep_pad_mr = NULL;
}
if (ia->ri_id->qp) {
rdma_destroy_qp(ia->ri_id);
ia->ri_id->qp = NULL;
}
rpcrdma_clean_cq(ep->rep_cq);
rc = ib_destroy_cq(ep->rep_cq);
if (rc)
dprintk("RPC: %s: ib_destroy_cq returned %i\n",
__func__, rc);
return rc;
}
/*
* Connect unconnected endpoint.
*/
int
rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
{
struct rdma_cm_id *id;
int rc = 0;
int retry_count = 0;
int reconnect = (ep->rep_connected != 0);
if (reconnect) {
struct rpcrdma_xprt *xprt;
retry:
rc = rpcrdma_ep_disconnect(ep, ia);
if (rc && rc != -ENOTCONN)
dprintk("RPC: %s: rpcrdma_ep_disconnect"
" status %i\n", __func__, rc);
rpcrdma_clean_cq(ep->rep_cq);
xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
id = rpcrdma_create_id(xprt, ia,
(struct sockaddr *)&xprt->rx_data.addr);
if (IS_ERR(id)) {
rc = PTR_ERR(id);
goto out;
}
/* TEMP TEMP TEMP - fail if new device:
* Deregister/remarshal *all* requests!
* Close and recreate adapter, pd, etc!
* Re-determine all attributes still sane!
* More stuff I haven't thought of!
* Rrrgh!
*/
if (ia->ri_id->device != id->device) {
printk("RPC: %s: can't reconnect on "
"different device!\n", __func__);
rdma_destroy_id(id);
rc = -ENETDOWN;
goto out;
}
/* END TEMP */
rdma_destroy_id(ia->ri_id);
ia->ri_id = id;
}
rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
if (rc) {
dprintk("RPC: %s: rdma_create_qp failed %i\n",
__func__, rc);
goto out;
}
/* XXX Tavor device performs badly with 2K MTU! */
if (strnicmp(ia->ri_id->device->dma_device->bus->name, "pci", 3) == 0) {
struct pci_dev *pcid = to_pci_dev(ia->ri_id->device->dma_device);
if (pcid->device == PCI_DEVICE_ID_MELLANOX_TAVOR &&
(pcid->vendor == PCI_VENDOR_ID_MELLANOX ||
pcid->vendor == PCI_VENDOR_ID_TOPSPIN)) {
struct ib_qp_attr attr = {
.path_mtu = IB_MTU_1024
};
rc = ib_modify_qp(ia->ri_id->qp, &attr, IB_QP_PATH_MTU);
}
}
/* Theoretically a client initiator_depth > 0 is not needed,
* but many peers fail to complete the connection unless they
* == responder_resources! */
if (ep->rep_remote_cma.initiator_depth !=
ep->rep_remote_cma.responder_resources)
ep->rep_remote_cma.initiator_depth =
ep->rep_remote_cma.responder_resources;
ep->rep_connected = 0;
rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
if (rc) {
dprintk("RPC: %s: rdma_connect() failed with %i\n",
__func__, rc);
goto out;
}
if (reconnect)
return 0;
wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
/*
* Check state. A non-peer reject indicates no listener
* (ECONNREFUSED), which may be a transient state. All
* others indicate a transport condition which has already
* undergone a best-effort.
*/
if (ep->rep_connected == -ECONNREFUSED
&& ++retry_count <= RDMA_CONNECT_RETRY_MAX) {
dprintk("RPC: %s: non-peer_reject, retry\n", __func__);
goto retry;
}
if (ep->rep_connected <= 0) {
/* Sometimes, the only way to reliably connect to remote
* CMs is to use same nonzero values for ORD and IRD. */
ep->rep_remote_cma.initiator_depth =
ep->rep_remote_cma.responder_resources;
if (ep->rep_remote_cma.initiator_depth == 0)
++ep->rep_remote_cma.initiator_depth;
if (ep->rep_remote_cma.responder_resources == 0)
++ep->rep_remote_cma.responder_resources;
if (retry_count++ == 0)
goto retry;
rc = ep->rep_connected;
} else {
dprintk("RPC: %s: connected\n", __func__);
}
out:
if (rc)
ep->rep_connected = rc;
return rc;
}
/*
* rpcrdma_ep_disconnect
*
* This is separate from destroy to facilitate the ability
* to reconnect without recreating the endpoint.
*
* This call is not reentrant, and must not be made in parallel
* on the same endpoint.
*/
int
rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
{
int rc;
rpcrdma_clean_cq(ep->rep_cq);
rc = rdma_disconnect(ia->ri_id);
if (!rc) {
/* returns without wait if not connected */
wait_event_interruptible(ep->rep_connect_wait,
ep->rep_connected != 1);
dprintk("RPC: %s: after wait, %sconnected\n", __func__,
(ep->rep_connected == 1) ? "still " : "dis");
} else {
dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc);
ep->rep_connected = rc;
}
return rc;
}
/*
* Initialize buffer memory
*/
int
rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep,
struct rpcrdma_ia *ia, struct rpcrdma_create_data_internal *cdata)
{
char *p;
size_t len;
int i, rc;
buf->rb_max_requests = cdata->max_requests;
spin_lock_init(&buf->rb_lock);
atomic_set(&buf->rb_credits, 1);
/* Need to allocate:
* 1. arrays for send and recv pointers
* 2. arrays of struct rpcrdma_req to fill in pointers
* 3. array of struct rpcrdma_rep for replies
* 4. padding, if any
* 5. mw's, if any
* Send/recv buffers in req/rep need to be registered
*/
len = buf->rb_max_requests *
(sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *));
len += cdata->padding;
switch (ia->ri_memreg_strategy) {
case RPCRDMA_MTHCAFMR:
/* TBD we are perhaps overallocating here */
len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS *
sizeof(struct rpcrdma_mw);
break;
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS *
sizeof(struct rpcrdma_mw);
break;
default:
break;
}
/* allocate 1, 4 and 5 in one shot */
p = kzalloc(len, GFP_KERNEL);
if (p == NULL) {
dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n",
__func__, len);
rc = -ENOMEM;
goto out;
}
buf->rb_pool = p; /* for freeing it later */
buf->rb_send_bufs = (struct rpcrdma_req **) p;
p = (char *) &buf->rb_send_bufs[buf->rb_max_requests];
buf->rb_recv_bufs = (struct rpcrdma_rep **) p;
p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests];
/*
* Register the zeroed pad buffer, if any.
*/
if (cdata->padding) {
rc = rpcrdma_register_internal(ia, p, cdata->padding,
&ep->rep_pad_mr, &ep->rep_pad);
if (rc)
goto out;
}
p += cdata->padding;
/*
* Allocate the fmr's, or mw's for mw_bind chunk registration.
* We "cycle" the mw's in order to minimize rkey reuse,
* and also reduce unbind-to-bind collision.
*/
INIT_LIST_HEAD(&buf->rb_mws);
switch (ia->ri_memreg_strategy) {
case RPCRDMA_MTHCAFMR:
{
struct rpcrdma_mw *r = (struct rpcrdma_mw *)p;
struct ib_fmr_attr fa = {
RPCRDMA_MAX_DATA_SEGS, 1, PAGE_SHIFT
};
/* TBD we are perhaps overallocating here */
for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) {
r->r.fmr = ib_alloc_fmr(ia->ri_pd,
IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ,
&fa);
if (IS_ERR(r->r.fmr)) {
rc = PTR_ERR(r->r.fmr);
dprintk("RPC: %s: ib_alloc_fmr"
" failed %i\n", __func__, rc);
goto out;
}
list_add(&r->mw_list, &buf->rb_mws);
++r;
}
}
break;
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
{
struct rpcrdma_mw *r = (struct rpcrdma_mw *)p;
/* Allocate one extra request's worth, for full cycling */
for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) {
r->r.mw = ib_alloc_mw(ia->ri_pd);
if (IS_ERR(r->r.mw)) {
rc = PTR_ERR(r->r.mw);
dprintk("RPC: %s: ib_alloc_mw"
" failed %i\n", __func__, rc);
goto out;
}
list_add(&r->mw_list, &buf->rb_mws);
++r;
}
}
break;
default:
break;
}
/*
* Allocate/init the request/reply buffers. Doing this
* using kmalloc for now -- one for each buf.
*/
for (i = 0; i < buf->rb_max_requests; i++) {
struct rpcrdma_req *req;
struct rpcrdma_rep *rep;
len = cdata->inline_wsize + sizeof(struct rpcrdma_req);
/* RPC layer requests *double* size + 1K RPC_SLACK_SPACE! */
/* Typical ~2400b, so rounding up saves work later */
if (len < 4096)
len = 4096;
req = kmalloc(len, GFP_KERNEL);
if (req == NULL) {
dprintk("RPC: %s: request buffer %d alloc"
" failed\n", __func__, i);
rc = -ENOMEM;
goto out;
}
memset(req, 0, sizeof(struct rpcrdma_req));
buf->rb_send_bufs[i] = req;
buf->rb_send_bufs[i]->rl_buffer = buf;
rc = rpcrdma_register_internal(ia, req->rl_base,
len - offsetof(struct rpcrdma_req, rl_base),
&buf->rb_send_bufs[i]->rl_handle,
&buf->rb_send_bufs[i]->rl_iov);
if (rc)
goto out;
buf->rb_send_bufs[i]->rl_size = len-sizeof(struct rpcrdma_req);
len = cdata->inline_rsize + sizeof(struct rpcrdma_rep);
rep = kmalloc(len, GFP_KERNEL);
if (rep == NULL) {
dprintk("RPC: %s: reply buffer %d alloc failed\n",
__func__, i);
rc = -ENOMEM;
goto out;
}
memset(rep, 0, sizeof(struct rpcrdma_rep));
buf->rb_recv_bufs[i] = rep;
buf->rb_recv_bufs[i]->rr_buffer = buf;
init_waitqueue_head(&rep->rr_unbind);
rc = rpcrdma_register_internal(ia, rep->rr_base,
len - offsetof(struct rpcrdma_rep, rr_base),
&buf->rb_recv_bufs[i]->rr_handle,
&buf->rb_recv_bufs[i]->rr_iov);
if (rc)
goto out;
}
dprintk("RPC: %s: max_requests %d\n",
__func__, buf->rb_max_requests);
/* done */
return 0;
out:
rpcrdma_buffer_destroy(buf);
return rc;
}
/*
* Unregister and destroy buffer memory. Need to deal with
* partial initialization, so it's callable from failed create.
* Must be called before destroying endpoint, as registrations
* reference it.
*/
void
rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
{
int rc, i;
struct rpcrdma_ia *ia = rdmab_to_ia(buf);
/* clean up in reverse order from create
* 1. recv mr memory (mr free, then kfree)
* 1a. bind mw memory
* 2. send mr memory (mr free, then kfree)
* 3. padding (if any) [moved to rpcrdma_ep_destroy]
* 4. arrays
*/
dprintk("RPC: %s: entering\n", __func__);
for (i = 0; i < buf->rb_max_requests; i++) {
if (buf->rb_recv_bufs && buf->rb_recv_bufs[i]) {
rpcrdma_deregister_internal(ia,
buf->rb_recv_bufs[i]->rr_handle,
&buf->rb_recv_bufs[i]->rr_iov);
kfree(buf->rb_recv_bufs[i]);
}
if (buf->rb_send_bufs && buf->rb_send_bufs[i]) {
while (!list_empty(&buf->rb_mws)) {
struct rpcrdma_mw *r;
r = list_entry(buf->rb_mws.next,
struct rpcrdma_mw, mw_list);
list_del(&r->mw_list);
switch (ia->ri_memreg_strategy) {
case RPCRDMA_MTHCAFMR:
rc = ib_dealloc_fmr(r->r.fmr);
if (rc)
dprintk("RPC: %s:"
" ib_dealloc_fmr"
" failed %i\n",
__func__, rc);
break;
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
rc = ib_dealloc_mw(r->r.mw);
if (rc)
dprintk("RPC: %s:"
" ib_dealloc_mw"
" failed %i\n",
__func__, rc);
break;
default:
break;
}
}
rpcrdma_deregister_internal(ia,
buf->rb_send_bufs[i]->rl_handle,
&buf->rb_send_bufs[i]->rl_iov);
kfree(buf->rb_send_bufs[i]);
}
}
kfree(buf->rb_pool);
}
/*
* Get a set of request/reply buffers.
*
* Reply buffer (if needed) is attached to send buffer upon return.
* Rule:
* rb_send_index and rb_recv_index MUST always be pointing to the
* *next* available buffer (non-NULL). They are incremented after
* removing buffers, and decremented *before* returning them.
*/
struct rpcrdma_req *
rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
{
struct rpcrdma_req *req;
unsigned long flags;
spin_lock_irqsave(&buffers->rb_lock, flags);
if (buffers->rb_send_index == buffers->rb_max_requests) {
spin_unlock_irqrestore(&buffers->rb_lock, flags);
dprintk("RPC: %s: out of request buffers\n", __func__);
return ((struct rpcrdma_req *)NULL);
}
req = buffers->rb_send_bufs[buffers->rb_send_index];
if (buffers->rb_send_index < buffers->rb_recv_index) {
dprintk("RPC: %s: %d extra receives outstanding (ok)\n",
__func__,
buffers->rb_recv_index - buffers->rb_send_index);
req->rl_reply = NULL;
} else {
req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index];
buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL;
}
buffers->rb_send_bufs[buffers->rb_send_index++] = NULL;
if (!list_empty(&buffers->rb_mws)) {
int i = RPCRDMA_MAX_SEGS - 1;
do {
struct rpcrdma_mw *r;
r = list_entry(buffers->rb_mws.next,
struct rpcrdma_mw, mw_list);
list_del(&r->mw_list);
req->rl_segments[i].mr_chunk.rl_mw = r;
} while (--i >= 0);
}
spin_unlock_irqrestore(&buffers->rb_lock, flags);
return req;
}
/*
* Put request/reply buffers back into pool.
* Pre-decrement counter/array index.
*/
void
rpcrdma_buffer_put(struct rpcrdma_req *req)
{
struct rpcrdma_buffer *buffers = req->rl_buffer;
struct rpcrdma_ia *ia = rdmab_to_ia(buffers);
int i;
unsigned long flags;
BUG_ON(req->rl_nchunks != 0);
spin_lock_irqsave(&buffers->rb_lock, flags);
buffers->rb_send_bufs[--buffers->rb_send_index] = req;
req->rl_niovs = 0;
if (req->rl_reply) {
buffers->rb_recv_bufs[--buffers->rb_recv_index] = req->rl_reply;
init_waitqueue_head(&req->rl_reply->rr_unbind);
req->rl_reply->rr_func = NULL;
req->rl_reply = NULL;
}
switch (ia->ri_memreg_strategy) {
case RPCRDMA_MTHCAFMR:
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
/*
* Cycle mw's back in reverse order, and "spin" them.
* This delays and scrambles reuse as much as possible.
*/
i = 1;
do {
struct rpcrdma_mw **mw;
mw = &req->rl_segments[i].mr_chunk.rl_mw;
list_add_tail(&(*mw)->mw_list, &buffers->rb_mws);
*mw = NULL;
} while (++i < RPCRDMA_MAX_SEGS);
list_add_tail(&req->rl_segments[0].mr_chunk.rl_mw->mw_list,
&buffers->rb_mws);
req->rl_segments[0].mr_chunk.rl_mw = NULL;
break;
default:
break;
}
spin_unlock_irqrestore(&buffers->rb_lock, flags);
}
/*
* Recover reply buffers from pool.
* This happens when recovering from error conditions.
* Post-increment counter/array index.
*/
void
rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
{
struct rpcrdma_buffer *buffers = req->rl_buffer;
unsigned long flags;
if (req->rl_iov.length == 0) /* special case xprt_rdma_allocate() */
buffers = ((struct rpcrdma_req *) buffers)->rl_buffer;
spin_lock_irqsave(&buffers->rb_lock, flags);
if (buffers->rb_recv_index < buffers->rb_max_requests) {
req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index];
buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL;
}
spin_unlock_irqrestore(&buffers->rb_lock, flags);
}
/*
* Put reply buffers back into pool when not attached to
* request. This happens in error conditions, and when
* aborting unbinds. Pre-decrement counter/array index.
*/
void
rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
{
struct rpcrdma_buffer *buffers = rep->rr_buffer;
unsigned long flags;
rep->rr_func = NULL;
spin_lock_irqsave(&buffers->rb_lock, flags);
buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep;
spin_unlock_irqrestore(&buffers->rb_lock, flags);
}
/*
* Wrappers for internal-use kmalloc memory registration, used by buffer code.
*/
int
rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len,
struct ib_mr **mrp, struct ib_sge *iov)
{
struct ib_phys_buf ipb;
struct ib_mr *mr;
int rc;
/*
* All memory passed here was kmalloc'ed, therefore phys-contiguous.
*/
iov->addr = ib_dma_map_single(ia->ri_id->device,
va, len, DMA_BIDIRECTIONAL);
iov->length = len;
if (ia->ri_bind_mem != NULL) {
*mrp = NULL;
iov->lkey = ia->ri_bind_mem->lkey;
return 0;
}
ipb.addr = iov->addr;
ipb.size = iov->length;
mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1,
IB_ACCESS_LOCAL_WRITE, &iov->addr);
dprintk("RPC: %s: phys convert: 0x%llx "
"registered 0x%llx length %d\n",
__func__, (unsigned long long)ipb.addr,
(unsigned long long)iov->addr, len);
if (IS_ERR(mr)) {
*mrp = NULL;
rc = PTR_ERR(mr);
dprintk("RPC: %s: failed with %i\n", __func__, rc);
} else {
*mrp = mr;
iov->lkey = mr->lkey;
rc = 0;
}
return rc;
}
int
rpcrdma_deregister_internal(struct rpcrdma_ia *ia,
struct ib_mr *mr, struct ib_sge *iov)
{
int rc;
ib_dma_unmap_single(ia->ri_id->device,
iov->addr, iov->length, DMA_BIDIRECTIONAL);
if (NULL == mr)
return 0;
rc = ib_dereg_mr(mr);
if (rc)
dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__, rc);
return rc;
}
/*
* Wrappers for chunk registration, shared by read/write chunk code.
*/
static void
rpcrdma_map_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg, int writing)
{
seg->mr_dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
seg->mr_dmalen = seg->mr_len;
if (seg->mr_page)
seg->mr_dma = ib_dma_map_page(ia->ri_id->device,
seg->mr_page, offset_in_page(seg->mr_offset),
seg->mr_dmalen, seg->mr_dir);
else
seg->mr_dma = ib_dma_map_single(ia->ri_id->device,
seg->mr_offset,
seg->mr_dmalen, seg->mr_dir);
}
static void
rpcrdma_unmap_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg)
{
if (seg->mr_page)
ib_dma_unmap_page(ia->ri_id->device,
seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
else
ib_dma_unmap_single(ia->ri_id->device,
seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
}
int
rpcrdma_register_external(struct rpcrdma_mr_seg *seg,
int nsegs, int writing, struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
int mem_priv = (writing ? IB_ACCESS_REMOTE_WRITE :
IB_ACCESS_REMOTE_READ);
struct rpcrdma_mr_seg *seg1 = seg;
int i;
int rc = 0;
switch (ia->ri_memreg_strategy) {
#if RPCRDMA_PERSISTENT_REGISTRATION
case RPCRDMA_ALLPHYSICAL:
rpcrdma_map_one(ia, seg, writing);
seg->mr_rkey = ia->ri_bind_mem->rkey;
seg->mr_base = seg->mr_dma;
seg->mr_nsegs = 1;
nsegs = 1;
break;
#endif
/* Registration using fast memory registration */
case RPCRDMA_MTHCAFMR:
{
u64 physaddrs[RPCRDMA_MAX_DATA_SEGS];
int len, pageoff = offset_in_page(seg->mr_offset);
seg1->mr_offset -= pageoff; /* start of page */
seg1->mr_len += pageoff;
len = -pageoff;
if (nsegs > RPCRDMA_MAX_DATA_SEGS)
nsegs = RPCRDMA_MAX_DATA_SEGS;
for (i = 0; i < nsegs;) {
rpcrdma_map_one(ia, seg, writing);
physaddrs[i] = seg->mr_dma;
len += seg->mr_len;
++seg;
++i;
/* Check for holes */
if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
offset_in_page((seg-1)->mr_offset+(seg-1)->mr_len))
break;
}
nsegs = i;
rc = ib_map_phys_fmr(seg1->mr_chunk.rl_mw->r.fmr,
physaddrs, nsegs, seg1->mr_dma);
if (rc) {
dprintk("RPC: %s: failed ib_map_phys_fmr "
"%u@0x%llx+%i (%d)... status %i\n", __func__,
len, (unsigned long long)seg1->mr_dma,
pageoff, nsegs, rc);
while (nsegs--)
rpcrdma_unmap_one(ia, --seg);
} else {
seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.fmr->rkey;
seg1->mr_base = seg1->mr_dma + pageoff;
seg1->mr_nsegs = nsegs;
seg1->mr_len = len;
}
}
break;
/* Registration using memory windows */
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
{
struct ib_mw_bind param;
rpcrdma_map_one(ia, seg, writing);
param.mr = ia->ri_bind_mem;
param.wr_id = 0ULL; /* no send cookie */
param.addr = seg->mr_dma;
param.length = seg->mr_len;
param.send_flags = 0;
param.mw_access_flags = mem_priv;
DECR_CQCOUNT(&r_xprt->rx_ep);
rc = ib_bind_mw(ia->ri_id->qp,
seg->mr_chunk.rl_mw->r.mw, ¶m);
if (rc) {
dprintk("RPC: %s: failed ib_bind_mw "
"%u@0x%llx status %i\n",
__func__, seg->mr_len,
(unsigned long long)seg->mr_dma, rc);
rpcrdma_unmap_one(ia, seg);
} else {
seg->mr_rkey = seg->mr_chunk.rl_mw->r.mw->rkey;
seg->mr_base = param.addr;
seg->mr_nsegs = 1;
nsegs = 1;
}
}
break;
/* Default registration each time */
default:
{
struct ib_phys_buf ipb[RPCRDMA_MAX_DATA_SEGS];
int len = 0;
if (nsegs > RPCRDMA_MAX_DATA_SEGS)
nsegs = RPCRDMA_MAX_DATA_SEGS;
for (i = 0; i < nsegs;) {
rpcrdma_map_one(ia, seg, writing);
ipb[i].addr = seg->mr_dma;
ipb[i].size = seg->mr_len;
len += seg->mr_len;
++seg;
++i;
/* Check for holes */
if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
offset_in_page((seg-1)->mr_offset+(seg-1)->mr_len))
break;
}
nsegs = i;
seg1->mr_base = seg1->mr_dma;
seg1->mr_chunk.rl_mr = ib_reg_phys_mr(ia->ri_pd,
ipb, nsegs, mem_priv, &seg1->mr_base);
if (IS_ERR(seg1->mr_chunk.rl_mr)) {
rc = PTR_ERR(seg1->mr_chunk.rl_mr);
dprintk("RPC: %s: failed ib_reg_phys_mr "
"%u@0x%llx (%d)... status %i\n",
__func__, len,
(unsigned long long)seg1->mr_dma, nsegs, rc);
while (nsegs--)
rpcrdma_unmap_one(ia, --seg);
} else {
seg1->mr_rkey = seg1->mr_chunk.rl_mr->rkey;
seg1->mr_nsegs = nsegs;
seg1->mr_len = len;
}
}
break;
}
if (rc)
return -1;
return nsegs;
}
int
rpcrdma_deregister_external(struct rpcrdma_mr_seg *seg,
struct rpcrdma_xprt *r_xprt, void *r)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct rpcrdma_mr_seg *seg1 = seg;
int nsegs = seg->mr_nsegs, rc;
switch (ia->ri_memreg_strategy) {
#if RPCRDMA_PERSISTENT_REGISTRATION
case RPCRDMA_ALLPHYSICAL:
BUG_ON(nsegs != 1);
rpcrdma_unmap_one(ia, seg);
rc = 0;
break;
#endif
case RPCRDMA_MTHCAFMR:
{
LIST_HEAD(l);
list_add(&seg->mr_chunk.rl_mw->r.fmr->list, &l);
rc = ib_unmap_fmr(&l);
while (seg1->mr_nsegs--)
rpcrdma_unmap_one(ia, seg++);
}
if (rc)
dprintk("RPC: %s: failed ib_unmap_fmr,"
" status %i\n", __func__, rc);
break;
case RPCRDMA_MEMWINDOWS_ASYNC:
case RPCRDMA_MEMWINDOWS:
{
struct ib_mw_bind param;
BUG_ON(nsegs != 1);
param.mr = ia->ri_bind_mem;
param.addr = 0ULL; /* unbind */
param.length = 0;
param.mw_access_flags = 0;
if (r) {
param.wr_id = (u64) (unsigned long) r;
param.send_flags = IB_SEND_SIGNALED;
INIT_CQCOUNT(&r_xprt->rx_ep);
} else {
param.wr_id = 0ULL;
param.send_flags = 0;
DECR_CQCOUNT(&r_xprt->rx_ep);
}
rc = ib_bind_mw(ia->ri_id->qp,
seg->mr_chunk.rl_mw->r.mw, ¶m);
rpcrdma_unmap_one(ia, seg);
}
if (rc)
dprintk("RPC: %s: failed ib_(un)bind_mw,"
" status %i\n", __func__, rc);
else
r = NULL; /* will upcall on completion */
break;
default:
rc = ib_dereg_mr(seg1->mr_chunk.rl_mr);
seg1->mr_chunk.rl_mr = NULL;
while (seg1->mr_nsegs--)
rpcrdma_unmap_one(ia, seg++);
if (rc)
dprintk("RPC: %s: failed ib_dereg_mr,"
" status %i\n", __func__, rc);
break;
}
if (r) {
struct rpcrdma_rep *rep = r;
void (*func)(struct rpcrdma_rep *) = rep->rr_func;
rep->rr_func = NULL;
func(rep); /* dereg done, callback now */
}
return nsegs;
}
/*
* Prepost any receive buffer, then post send.
*
* Receive buffer is donated to hardware, reclaimed upon recv completion.
*/
int
rpcrdma_ep_post(struct rpcrdma_ia *ia,
struct rpcrdma_ep *ep,
struct rpcrdma_req *req)
{
struct ib_send_wr send_wr, *send_wr_fail;
struct rpcrdma_rep *rep = req->rl_reply;
int rc;
if (rep) {
rc = rpcrdma_ep_post_recv(ia, ep, rep);
if (rc)
goto out;
req->rl_reply = NULL;
}
send_wr.next = NULL;
send_wr.wr_id = 0ULL; /* no send cookie */
send_wr.sg_list = req->rl_send_iov;
send_wr.num_sge = req->rl_niovs;
send_wr.opcode = IB_WR_SEND;
send_wr.imm_data = 0;
if (send_wr.num_sge == 4) /* no need to sync any pad (constant) */
ib_dma_sync_single_for_device(ia->ri_id->device,
req->rl_send_iov[3].addr, req->rl_send_iov[3].length,
DMA_TO_DEVICE);
ib_dma_sync_single_for_device(ia->ri_id->device,
req->rl_send_iov[1].addr, req->rl_send_iov[1].length,
DMA_TO_DEVICE);
ib_dma_sync_single_for_device(ia->ri_id->device,
req->rl_send_iov[0].addr, req->rl_send_iov[0].length,
DMA_TO_DEVICE);
if (DECR_CQCOUNT(ep) > 0)
send_wr.send_flags = 0;
else { /* Provider must take a send completion every now and then */
INIT_CQCOUNT(ep);
send_wr.send_flags = IB_SEND_SIGNALED;
}
rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail);
if (rc)
dprintk("RPC: %s: ib_post_send returned %i\n", __func__,
rc);
out:
return rc;
}
/*
* (Re)post a receive buffer.
*/
int
rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
struct rpcrdma_ep *ep,
struct rpcrdma_rep *rep)
{
struct ib_recv_wr recv_wr, *recv_wr_fail;
int rc;
recv_wr.next = NULL;
recv_wr.wr_id = (u64) (unsigned long) rep;
recv_wr.sg_list = &rep->rr_iov;
recv_wr.num_sge = 1;
ib_dma_sync_single_for_cpu(ia->ri_id->device,
rep->rr_iov.addr, rep->rr_iov.length, DMA_BIDIRECTIONAL);
DECR_CQCOUNT(ep);
rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
if (rc)
dprintk("RPC: %s: ib_post_recv returned %i\n", __func__,
rc);
return rc;
}
