#include <linux/prefetch.h>
#include <linux/sunrpc/addr.h>
#include <asm/bitops.h>
+#include <linux/module.h> /* try_module_get()/module_put() */
#include "xprt_rdma.h"
* 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 struct workqueue_struct *rpcrdma_receive_wq;
-static void
-rpcrdma_run_tasklet(unsigned long data)
+int
+rpcrdma_alloc_wq(void)
{
- struct rpcrdma_rep *rep;
- void (*func)(struct rpcrdma_rep *);
- unsigned long flags;
+ struct workqueue_struct *recv_wq;
- 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);
-}
+ recv_wq = alloc_workqueue("xprtrdma_receive",
+ WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_HIGHPRI,
+ 0);
+ if (!recv_wq)
+ return -ENOMEM;
-static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL);
-
-static const char * const async_event[] = {
- "CQ error",
- "QP fatal error",
- "QP request error",
- "QP access error",
- "communication established",
- "send queue drained",
- "path migration successful",
- "path mig error",
- "device fatal error",
- "port active",
- "port error",
- "LID change",
- "P_key change",
- "SM change",
- "SRQ error",
- "SRQ limit reached",
- "last WQE reached",
- "client reregister",
- "GID change",
-};
-
-#define ASYNC_MSG(status) \
- ((status) < ARRAY_SIZE(async_event) ? \
- async_event[(status)] : "unknown async error")
+ rpcrdma_receive_wq = recv_wq;
+ return 0;
+}
-static void
-rpcrdma_schedule_tasklet(struct list_head *sched_list)
+void
+rpcrdma_destroy_wq(void)
{
- unsigned long flags;
+ struct workqueue_struct *wq;
- spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
- list_splice_tail(sched_list, &rpcrdma_tasklets_g);
- spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
- tasklet_schedule(&rpcrdma_tasklet_g);
+ if (rpcrdma_receive_wq) {
+ wq = rpcrdma_receive_wq;
+ rpcrdma_receive_wq = NULL;
+ destroy_workqueue(wq);
+ }
}
static void
struct rpcrdma_ep *ep = context;
pr_err("RPC: %s: %s on device %s ep %p\n",
- __func__, ASYNC_MSG(event->event),
+ __func__, ib_event_msg(event->event),
event->device->name, context);
if (ep->rep_connected == 1) {
ep->rep_connected = -EIO;
struct rpcrdma_ep *ep = context;
pr_err("RPC: %s: %s on device %s ep %p\n",
- __func__, ASYNC_MSG(event->event),
+ __func__, ib_event_msg(event->event),
event->device->name, context);
if (ep->rep_connected == 1) {
ep->rep_connected = -EIO;
}
}
-static const char * const wc_status[] = {
- "success",
- "local length error",
- "local QP operation error",
- "local EE context operation error",
- "local protection error",
- "WR flushed",
- "memory management operation error",
- "bad response error",
- "local access error",
- "remote invalid request error",
- "remote access error",
- "remote operation error",
- "transport retry counter exceeded",
- "RNR retry counter exceeded",
- "local RDD violation error",
- "remove invalid RD request",
- "operation aborted",
- "invalid EE context number",
- "invalid EE context state",
- "fatal error",
- "response timeout error",
- "general error",
-};
-
-#define COMPLETION_MSG(status) \
- ((status) < ARRAY_SIZE(wc_status) ? \
- wc_status[(status)] : "unexpected completion error")
-
static void
rpcrdma_sendcq_process_wc(struct ib_wc *wc)
{
if (wc->status != IB_WC_SUCCESS &&
wc->status != IB_WC_WR_FLUSH_ERR)
pr_err("RPC: %s: SEND: %s\n",
- __func__, COMPLETION_MSG(wc->status));
+ __func__, ib_wc_status_msg(wc->status));
} else {
struct rpcrdma_mw *r;
}
}
-static int
-rpcrdma_sendcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep)
+/* The common case is a single send completion is waiting. By
+ * passing two WC entries to ib_poll_cq, a return code of 1
+ * means there is exactly one WC waiting and no more. We don't
+ * have to invoke ib_poll_cq again to know that the CQ has been
+ * properly drained.
+ */
+static void
+rpcrdma_sendcq_poll(struct ib_cq *cq)
{
- struct ib_wc *wcs;
- int budget, count, rc;
+ struct ib_wc *pos, wcs[2];
+ int count, rc;
- budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE;
do {
- wcs = ep->rep_send_wcs;
+ pos = wcs;
- rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs);
- if (rc <= 0)
- return rc;
+ rc = ib_poll_cq(cq, ARRAY_SIZE(wcs), pos);
+ if (rc < 0)
+ break;
count = rc;
while (count-- > 0)
- rpcrdma_sendcq_process_wc(wcs++);
- } while (rc == RPCRDMA_POLLSIZE && --budget);
- return 0;
+ rpcrdma_sendcq_process_wc(pos++);
+ } while (rc == ARRAY_SIZE(wcs));
+ return;
}
-/*
- * Handle send, fast_reg_mr, and local_inv completions.
- *
- * Send events are typically suppressed and thus do not result
- * in an upcall. Occasionally one is signaled, however. This
- * prevents the provider's completion queue from wrapping and
- * losing a completion.
+/* Handle provider send completion upcalls.
*/
static void
rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context)
{
- struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context;
- int rc;
-
- rc = rpcrdma_sendcq_poll(cq, ep);
- if (rc) {
- dprintk("RPC: %s: ib_poll_cq failed: %i\n",
- __func__, rc);
- return;
- }
+ do {
+ rpcrdma_sendcq_poll(cq);
+ } while (ib_req_notify_cq(cq, IB_CQ_NEXT_COMP |
+ IB_CQ_REPORT_MISSED_EVENTS) > 0);
+}
- rc = ib_req_notify_cq(cq,
- IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
- if (rc == 0)
- return;
- if (rc < 0) {
- dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
- __func__, rc);
- return;
- }
+static void
+rpcrdma_receive_worker(struct work_struct *work)
+{
+ struct rpcrdma_rep *rep =
+ container_of(work, struct rpcrdma_rep, rr_work);
- rpcrdma_sendcq_poll(cq, ep);
+ rpcrdma_reply_handler(rep);
}
static void
-rpcrdma_recvcq_process_wc(struct ib_wc *wc, struct list_head *sched_list)
+rpcrdma_recvcq_process_wc(struct ib_wc *wc)
{
struct rpcrdma_rep *rep =
(struct rpcrdma_rep *)(unsigned long)wc->wr_id;
__func__, rep, wc->byte_len);
rep->rr_len = wc->byte_len;
- ib_dma_sync_single_for_cpu(rdmab_to_ia(rep->rr_buffer)->ri_id->device,
+ ib_dma_sync_single_for_cpu(rep->rr_device,
rdmab_addr(rep->rr_rdmabuf),
rep->rr_len, DMA_FROM_DEVICE);
prefetch(rdmab_to_msg(rep->rr_rdmabuf));
out_schedule:
- list_add_tail(&rep->rr_list, sched_list);
+ queue_work(rpcrdma_receive_wq, &rep->rr_work);
return;
+
out_fail:
if (wc->status != IB_WC_WR_FLUSH_ERR)
pr_err("RPC: %s: rep %p: %s\n",
- __func__, rep, COMPLETION_MSG(wc->status));
- rep->rr_len = ~0U;
+ __func__, rep, ib_wc_status_msg(wc->status));
+ rep->rr_len = RPCRDMA_BAD_LEN;
goto out_schedule;
}
-static int
-rpcrdma_recvcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep)
+/* The wc array is on stack: automatic memory is always CPU-local.
+ *
+ * struct ib_wc is 64 bytes, making the poll array potentially
+ * large. But this is at the bottom of the call chain. Further
+ * substantial work is done in another thread.
+ */
+static void
+rpcrdma_recvcq_poll(struct ib_cq *cq)
{
- struct list_head sched_list;
- struct ib_wc *wcs;
- int budget, count, rc;
+ struct ib_wc *pos, wcs[4];
+ int count, rc;
- INIT_LIST_HEAD(&sched_list);
- budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE;
do {
- wcs = ep->rep_recv_wcs;
+ pos = wcs;
- rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs);
- if (rc <= 0)
- goto out_schedule;
+ rc = ib_poll_cq(cq, ARRAY_SIZE(wcs), pos);
+ if (rc < 0)
+ break;
count = rc;
while (count-- > 0)
- rpcrdma_recvcq_process_wc(wcs++, &sched_list);
- } while (rc == RPCRDMA_POLLSIZE && --budget);
- rc = 0;
-
-out_schedule:
- rpcrdma_schedule_tasklet(&sched_list);
- return rc;
+ rpcrdma_recvcq_process_wc(pos++);
+ } while (rc == ARRAY_SIZE(wcs));
}
-/*
- * Handle receive completions.
- *
- * 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.
+/* Handle provider receive completion upcalls.
*/
static void
rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context)
{
- struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context;
- int rc;
-
- rc = rpcrdma_recvcq_poll(cq, ep);
- if (rc) {
- dprintk("RPC: %s: ib_poll_cq failed: %i\n",
- __func__, rc);
- return;
- }
-
- rc = ib_req_notify_cq(cq,
- IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
- if (rc == 0)
- return;
- if (rc < 0) {
- dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
- __func__, rc);
- return;
- }
-
- rpcrdma_recvcq_poll(cq, ep);
+ do {
+ rpcrdma_recvcq_poll(cq);
+ } while (ib_req_notify_cq(cq, IB_CQ_NEXT_COMP |
+ IB_CQ_REPORT_MISSED_EVENTS) > 0);
}
static void
rpcrdma_flush_cqs(struct rpcrdma_ep *ep)
{
struct ib_wc wc;
- LIST_HEAD(sched_list);
while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0)
- rpcrdma_recvcq_process_wc(&wc, &sched_list);
- if (!list_empty(&sched_list))
- rpcrdma_schedule_tasklet(&sched_list);
+ rpcrdma_recvcq_process_wc(&wc);
while (ib_poll_cq(ep->rep_attr.send_cq, 1, &wc) > 0)
rpcrdma_sendcq_process_wc(&wc);
}
-#if IS_ENABLED(CONFIG_SUNRPC_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",
- "multicast join",
- "multicast error",
- "address change",
- "timewait exit",
-};
-
-#define CONNECTION_MSG(status) \
- ((status) < ARRAY_SIZE(conn) ? \
- conn[(status)] : "unrecognized connection error")
-#endif
-
static int
rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
{
default:
dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n",
__func__, sap, rpc_get_port(sap), ep,
- CONNECTION_MSG(event->event));
+ rdma_event_msg(event->event));
break;
}
pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n",
sap, rpc_get_port(sap),
- ia->ri_id->device->name,
+ ia->ri_device->name,
ia->ri_ops->ro_displayname,
xprt->rx_buf.rb_max_requests,
ird, ird < 4 && ird < tird / 2 ? " (low!)" : "");
return 0;
}
+static void rpcrdma_destroy_id(struct rdma_cm_id *id)
+{
+ if (id) {
+ module_put(id->device->owner);
+ rdma_destroy_id(id);
+ }
+}
+
static struct rdma_cm_id *
rpcrdma_create_id(struct rpcrdma_xprt *xprt,
struct rpcrdma_ia *ia, struct sockaddr *addr)
init_completion(&ia->ri_done);
- id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, IB_QPT_RC);
+ id = rdma_create_id(&init_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",
}
wait_for_completion_interruptible_timeout(&ia->ri_done,
msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
+
+ /* FIXME:
+ * Until xprtrdma supports DEVICE_REMOVAL, the provider must
+ * be pinned while there are active NFS/RDMA mounts to prevent
+ * hangs and crashes at umount time.
+ */
+ if (!ia->ri_async_rc && !try_module_get(id->device->owner)) {
+ dprintk("RPC: %s: Failed to get device module\n",
+ __func__);
+ ia->ri_async_rc = -ENODEV;
+ }
rc = ia->ri_async_rc;
if (rc)
goto out;
if (rc) {
dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
__func__, rc);
- goto out;
+ goto put;
}
wait_for_completion_interruptible_timeout(&ia->ri_done,
msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
rc = ia->ri_async_rc;
if (rc)
- goto out;
+ goto put;
return id;
-
+put:
+ module_put(id->device->owner);
out:
rdma_destroy_id(id);
return ERR_PTR(rc);
int
rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
{
- int rc, mem_priv;
struct rpcrdma_ia *ia = &xprt->rx_ia;
struct ib_device_attr *devattr = &ia->ri_devattr;
+ int rc;
+
+ ia->ri_dma_mr = NULL;
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_device = ia->ri_id->device;
- ia->ri_pd = ib_alloc_pd(ia->ri_id->device);
+ ia->ri_pd = ib_alloc_pd(ia->ri_device);
if (IS_ERR(ia->ri_pd)) {
rc = PTR_ERR(ia->ri_pd);
dprintk("RPC: %s: ib_alloc_pd() failed %i\n",
goto out2;
}
- rc = ib_query_device(ia->ri_id->device, devattr);
+ rc = ib_query_device(ia->ri_device, devattr);
if (rc) {
dprintk("RPC: %s: ib_query_device failed %d\n",
__func__, rc);
goto out3;
}
- if (devattr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) {
- ia->ri_have_dma_lkey = 1;
- ia->ri_dma_lkey = ia->ri_id->device->local_dma_lkey;
- }
-
if (memreg == RPCRDMA_FRMR) {
- /* Requires both frmr reg and local dma lkey */
- if (((devattr->device_cap_flags &
- (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) !=
- (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) ||
- (devattr->max_fast_reg_page_list_len == 0)) {
+ if (!(devattr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) ||
+ (devattr->max_fast_reg_page_list_len == 0)) {
dprintk("RPC: %s: FRMR registration "
"not supported by HCA\n", __func__);
memreg = RPCRDMA_MTHCAFMR;
}
}
if (memreg == RPCRDMA_MTHCAFMR) {
- if (!ia->ri_id->device->alloc_fmr) {
+ if (!ia->ri_device->alloc_fmr) {
dprintk("RPC: %s: MTHCAFMR registration "
"not supported by HCA\n", __func__);
- memreg = RPCRDMA_ALLPHYSICAL;
+ rc = -EINVAL;
+ goto out3;
}
}
- /*
- * 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.
- */
switch (memreg) {
case RPCRDMA_FRMR:
ia->ri_ops = &rpcrdma_frwr_memreg_ops;
break;
case RPCRDMA_ALLPHYSICAL:
ia->ri_ops = &rpcrdma_physical_memreg_ops;
- mem_priv = IB_ACCESS_LOCAL_WRITE |
- IB_ACCESS_REMOTE_WRITE |
- IB_ACCESS_REMOTE_READ;
- goto register_setup;
+ break;
case RPCRDMA_MTHCAFMR:
ia->ri_ops = &rpcrdma_fmr_memreg_ops;
- if (ia->ri_have_dma_lkey)
- break;
- mem_priv = IB_ACCESS_LOCAL_WRITE;
- register_setup:
- 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",
- __func__, PTR_ERR(ia->ri_bind_mem));
- rc = -ENOMEM;
- goto out3;
- }
break;
default:
printk(KERN_ERR "RPC: Unsupported memory "
dprintk("RPC: %s: memory registration strategy is '%s'\n",
__func__, ia->ri_ops->ro_displayname);
- /* Else will do memory reg/dereg for each chunk */
- ia->ri_memreg_strategy = memreg;
-
rwlock_init(&ia->ri_qplock);
return 0;
ib_dealloc_pd(ia->ri_pd);
ia->ri_pd = NULL;
out2:
- rdma_destroy_id(ia->ri_id);
+ rpcrdma_destroy_id(ia->ri_id);
ia->ri_id = NULL;
out1:
return rc;
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)) {
if (ia->ri_id->qp)
rdma_destroy_qp(ia->ri_id);
- rdma_destroy_id(ia->ri_id);
+ rpcrdma_destroy_id(ia->ri_id);
ia->ri_id = NULL;
}
- 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 the pd is still busy, xprtrdma missed freeing a resource */
+ if (ia->ri_pd && !IS_ERR(ia->ri_pd))
+ ib_dealloc_pd(ia->ri_pd);
}
/*
{
struct ib_device_attr *devattr = &ia->ri_devattr;
struct ib_cq *sendcq, *recvcq;
+ struct ib_cq_init_attr cq_attr = {};
+ unsigned int max_qp_wr;
int rc, err;
+ if (devattr->max_sge < RPCRDMA_MAX_IOVS) {
+ dprintk("RPC: %s: insufficient sge's available\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ if (devattr->max_qp_wr <= RPCRDMA_BACKWARD_WRS) {
+ dprintk("RPC: %s: insufficient wqe's available\n",
+ __func__);
+ return -ENOMEM;
+ }
+ max_qp_wr = devattr->max_qp_wr - RPCRDMA_BACKWARD_WRS;
+
/* check provider's send/recv wr limits */
- if (cdata->max_requests > devattr->max_qp_wr)
- cdata->max_requests = devattr->max_qp_wr;
+ if (cdata->max_requests > max_qp_wr)
+ cdata->max_requests = max_qp_wr;
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;
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_send_sge = (cdata->padding ? 4 : 2);
+ ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
+ ep->rep_attr.cap.max_send_sge = RPCRDMA_MAX_IOVS;
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;
- if (cdata->padding) {
- ep->rep_padbuf = rpcrdma_alloc_regbuf(ia, cdata->padding,
- GFP_KERNEL);
- if (IS_ERR(ep->rep_padbuf))
- return PTR_ERR(ep->rep_padbuf);
- } else
- ep->rep_padbuf = NULL;
-
dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
"iovs: send %d recv %d\n",
__func__,
init_waitqueue_head(&ep->rep_connect_wait);
INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);
- sendcq = ib_create_cq(ia->ri_id->device, rpcrdma_sendcq_upcall,
- rpcrdma_cq_async_error_upcall, ep,
- ep->rep_attr.cap.max_send_wr + 1, 0);
+ cq_attr.cqe = ep->rep_attr.cap.max_send_wr + 1;
+ sendcq = ib_create_cq(ia->ri_device, rpcrdma_sendcq_upcall,
+ rpcrdma_cq_async_error_upcall, NULL, &cq_attr);
if (IS_ERR(sendcq)) {
rc = PTR_ERR(sendcq);
dprintk("RPC: %s: failed to create send CQ: %i\n",
goto out2;
}
- recvcq = ib_create_cq(ia->ri_id->device, rpcrdma_recvcq_upcall,
- rpcrdma_cq_async_error_upcall, ep,
- ep->rep_attr.cap.max_recv_wr + 1, 0);
+ cq_attr.cqe = ep->rep_attr.cap.max_recv_wr + 1;
+ recvcq = ib_create_cq(ia->ri_device, rpcrdma_recvcq_upcall,
+ rpcrdma_cq_async_error_upcall, NULL, &cq_attr);
if (IS_ERR(recvcq)) {
rc = PTR_ERR(recvcq);
dprintk("RPC: %s: failed to create recv CQ: %i\n",
dprintk("RPC: %s: ib_destroy_cq returned %i\n",
__func__, err);
out1:
- rpcrdma_free_regbuf(ia, ep->rep_padbuf);
+ if (ia->ri_dma_mr)
+ ib_dereg_mr(ia->ri_dma_mr);
return rc;
}
cancel_delayed_work_sync(&ep->rep_connect_worker);
- if (ia->ri_id->qp) {
+ if (ia->ri_id->qp)
rpcrdma_ep_disconnect(ep, ia);
+
+ rpcrdma_clean_cq(ep->rep_attr.recv_cq);
+ rpcrdma_clean_cq(ep->rep_attr.send_cq);
+
+ if (ia->ri_id->qp) {
rdma_destroy_qp(ia->ri_id);
ia->ri_id->qp = NULL;
}
- rpcrdma_free_regbuf(ia, ep->rep_padbuf);
-
- rpcrdma_clean_cq(ep->rep_attr.recv_cq);
rc = ib_destroy_cq(ep->rep_attr.recv_cq);
if (rc)
dprintk("RPC: %s: ib_destroy_cq returned %i\n",
__func__, rc);
- rpcrdma_clean_cq(ep->rep_attr.send_cq);
rc = ib_destroy_cq(ep->rep_attr.send_cq);
if (rc)
dprintk("RPC: %s: ib_destroy_cq returned %i\n",
__func__, rc);
+
+ if (ia->ri_dma_mr) {
+ rc = ib_dereg_mr(ia->ri_dma_mr);
+ dprintk("RPC: %s: ib_dereg_mr returned %i\n",
+ __func__, rc);
+ }
}
/*
rpcrdma_flush_cqs(ep);
xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
- ia->ri_ops->ro_reset(xprt);
-
id = rpcrdma_create_id(xprt, ia,
(struct sockaddr *)&xprt->rx_data.addr);
if (IS_ERR(id)) {
* More stuff I haven't thought of!
* Rrrgh!
*/
- if (ia->ri_id->device != id->device) {
+ if (ia->ri_device != id->device) {
printk("RPC: %s: can't reconnect on "
"different device!\n", __func__);
- rdma_destroy_id(id);
+ rpcrdma_destroy_id(id);
rc = -ENETUNREACH;
goto out;
}
if (rc) {
dprintk("RPC: %s: rdma_create_qp failed %i\n",
__func__, rc);
- rdma_destroy_id(id);
+ rpcrdma_destroy_id(id);
rc = -ENETUNREACH;
goto out;
}
write_unlock(&ia->ri_qplock);
rdma_destroy_qp(old);
- rdma_destroy_id(old);
+ rpcrdma_destroy_id(old);
} else {
dprintk("RPC: %s: connecting...\n", __func__);
rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
}
rc = ep->rep_connected;
} else {
+ struct rpcrdma_xprt *r_xprt;
+ unsigned int extras;
+
dprintk("RPC: %s: connected\n", __func__);
+
+ r_xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
+ extras = r_xprt->rx_buf.rb_bc_srv_max_requests;
+
+ if (extras) {
+ rc = rpcrdma_ep_post_extra_recv(r_xprt, extras);
+ if (rc)
+ pr_warn("%s: rpcrdma_ep_post_extra_recv: %i\n",
+ __func__, rc);
+ rc = 0;
+ }
}
out:
}
}
-static struct rpcrdma_req *
+struct rpcrdma_req *
rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
{
+ struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
struct rpcrdma_req *req;
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (req == NULL)
return ERR_PTR(-ENOMEM);
+ INIT_LIST_HEAD(&req->rl_free);
+ spin_lock(&buffer->rb_reqslock);
+ list_add(&req->rl_all, &buffer->rb_allreqs);
+ spin_unlock(&buffer->rb_reqslock);
req->rl_buffer = &r_xprt->rx_buf;
return req;
}
-static struct rpcrdma_rep *
+struct rpcrdma_rep *
rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
goto out_free;
}
- rep->rr_buffer = &r_xprt->rx_buf;
+ rep->rr_device = ia->ri_device;
+ rep->rr_rxprt = r_xprt;
+ INIT_WORK(&rep->rr_work, rpcrdma_receive_worker);
return rep;
out_free:
{
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
- struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
- char *p;
- size_t len;
int i, rc;
- buf->rb_max_requests = cdata->max_requests;
+ buf->rb_max_requests = r_xprt->rx_data.max_requests;
+ buf->rb_bc_srv_max_requests = 0;
spin_lock_init(&buf->rb_lock);
- /* 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
- * Send/recv buffers in req/rep need to be registered
- */
- len = buf->rb_max_requests *
- (sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *));
-
- 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];
-
rc = ia->ri_ops->ro_init(r_xprt);
if (rc)
goto out;
+ INIT_LIST_HEAD(&buf->rb_send_bufs);
+ INIT_LIST_HEAD(&buf->rb_allreqs);
+ spin_lock_init(&buf->rb_reqslock);
for (i = 0; i < buf->rb_max_requests; i++) {
struct rpcrdma_req *req;
- struct rpcrdma_rep *rep;
req = rpcrdma_create_req(r_xprt);
if (IS_ERR(req)) {
rc = PTR_ERR(req);
goto out;
}
- buf->rb_send_bufs[i] = req;
+ req->rl_backchannel = false;
+ list_add(&req->rl_free, &buf->rb_send_bufs);
+ }
+
+ INIT_LIST_HEAD(&buf->rb_recv_bufs);
+ for (i = 0; i < buf->rb_max_requests + 2; i++) {
+ struct rpcrdma_rep *rep;
rep = rpcrdma_create_rep(r_xprt);
if (IS_ERR(rep)) {
rc = PTR_ERR(rep);
goto out;
}
- buf->rb_recv_bufs[i] = rep;
+ list_add(&rep->rr_list, &buf->rb_recv_bufs);
}
return 0;
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_free);
+ list_del(&req->rl_free);
+ 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_ia *ia, struct rpcrdma_rep *rep)
{
- if (!rep)
- return;
-
rpcrdma_free_regbuf(ia, rep->rr_rdmabuf);
kfree(rep);
}
-static void
+void
rpcrdma_destroy_req(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
{
- if (!req)
- return;
-
rpcrdma_free_regbuf(ia, req->rl_sendbuf);
rpcrdma_free_regbuf(ia, req->rl_rdmabuf);
kfree(req);
rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
{
struct rpcrdma_ia *ia = rdmab_to_ia(buf);
- int i;
-
- /* clean up in reverse order from create
- * 1. recv mr memory (mr free, then kfree)
- * 2. send mr memory (mr free, then kfree)
- * 3. MWs
- */
- dprintk("RPC: %s: entering\n", __func__);
-
- for (i = 0; i < buf->rb_max_requests; i++) {
- if (buf->rb_recv_bufs)
- rpcrdma_destroy_rep(ia, buf->rb_recv_bufs[i]);
- if (buf->rb_send_bufs)
- rpcrdma_destroy_req(ia, buf->rb_send_bufs[i]);
- }
-
- ia->ri_ops->ro_destroy(buf);
- kfree(buf->rb_pool);
-}
+ while (!list_empty(&buf->rb_recv_bufs)) {
+ struct rpcrdma_rep *rep;
-/* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving
- * some req segments uninitialized.
- */
-static void
-rpcrdma_buffer_put_mr(struct rpcrdma_mw **mw, struct rpcrdma_buffer *buf)
-{
- if (*mw) {
- list_add_tail(&(*mw)->mw_list, &buf->rb_mws);
- *mw = NULL;
+ rep = rpcrdma_buffer_get_rep_locked(buf);
+ rpcrdma_destroy_rep(ia, rep);
}
-}
-/* Cycle mw's back in reverse order, and "spin" them.
- * This delays and scrambles reuse as much as possible.
- */
-static void
-rpcrdma_buffer_put_mrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
-{
- struct rpcrdma_mr_seg *seg = req->rl_segments;
- struct rpcrdma_mr_seg *seg1 = seg;
- int i;
+ spin_lock(&buf->rb_reqslock);
+ while (!list_empty(&buf->rb_allreqs)) {
+ struct rpcrdma_req *req;
- for (i = 1, seg++; i < RPCRDMA_MAX_SEGS; seg++, i++)
- rpcrdma_buffer_put_mr(&seg->rl_mw, buf);
- rpcrdma_buffer_put_mr(&seg1->rl_mw, buf);
-}
+ req = list_first_entry(&buf->rb_allreqs,
+ struct rpcrdma_req, rl_all);
+ list_del(&req->rl_all);
-static void
-rpcrdma_buffer_put_sendbuf(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
-{
- buf->rb_send_bufs[--buf->rb_send_index] = req;
- req->rl_niovs = 0;
- if (req->rl_reply) {
- buf->rb_recv_bufs[--buf->rb_recv_index] = req->rl_reply;
- req->rl_reply->rr_func = NULL;
- req->rl_reply = NULL;
+ spin_unlock(&buf->rb_reqslock);
+ rpcrdma_destroy_req(ia, req);
+ spin_lock(&buf->rb_reqslock);
}
-}
-
-/* rpcrdma_unmap_one() was already done during deregistration.
- * Redo only the ib_post_send().
- */
-static void
-rpcrdma_retry_local_inv(struct rpcrdma_mw *r, struct rpcrdma_ia *ia)
-{
- struct rpcrdma_xprt *r_xprt =
- container_of(ia, struct rpcrdma_xprt, rx_ia);
- struct ib_send_wr invalidate_wr, *bad_wr;
- int rc;
-
- dprintk("RPC: %s: FRMR %p is stale\n", __func__, r);
-
- /* When this FRMR is re-inserted into rb_mws, it is no longer stale */
- r->r.frmr.fr_state = FRMR_IS_INVALID;
-
- memset(&invalidate_wr, 0, sizeof(invalidate_wr));
- invalidate_wr.wr_id = (unsigned long)(void *)r;
- invalidate_wr.opcode = IB_WR_LOCAL_INV;
- invalidate_wr.ex.invalidate_rkey = r->r.frmr.fr_mr->rkey;
- DECR_CQCOUNT(&r_xprt->rx_ep);
-
- dprintk("RPC: %s: frmr %p invalidating rkey %08x\n",
- __func__, r, r->r.frmr.fr_mr->rkey);
+ spin_unlock(&buf->rb_reqslock);
- read_lock(&ia->ri_qplock);
- rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
- read_unlock(&ia->ri_qplock);
- if (rc) {
- /* Force rpcrdma_buffer_get() to retry */
- r->r.frmr.fr_state = FRMR_IS_STALE;
- dprintk("RPC: %s: ib_post_send failed, %i\n",
- __func__, rc);
- }
+ ia->ri_ops->ro_destroy(buf);
}
-static void
-rpcrdma_retry_flushed_linv(struct list_head *stale,
- struct rpcrdma_buffer *buf)
+struct rpcrdma_mw *
+rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt)
{
- struct rpcrdma_ia *ia = rdmab_to_ia(buf);
- struct list_head *pos;
- struct rpcrdma_mw *r;
- unsigned long flags;
-
- list_for_each(pos, stale) {
- r = list_entry(pos, struct rpcrdma_mw, mw_list);
- rpcrdma_retry_local_inv(r, ia);
- }
-
- spin_lock_irqsave(&buf->rb_lock, flags);
- list_splice_tail(stale, &buf->rb_mws);
- spin_unlock_irqrestore(&buf->rb_lock, flags);
-}
+ struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+ struct rpcrdma_mw *mw = NULL;
-static struct rpcrdma_req *
-rpcrdma_buffer_get_frmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf,
- struct list_head *stale)
-{
- struct rpcrdma_mw *r;
- int i;
-
- i = RPCRDMA_MAX_SEGS - 1;
- while (!list_empty(&buf->rb_mws)) {
- r = list_entry(buf->rb_mws.next,
- struct rpcrdma_mw, mw_list);
- list_del(&r->mw_list);
- if (r->r.frmr.fr_state == FRMR_IS_STALE) {
- list_add(&r->mw_list, stale);
- continue;
- }
- req->rl_segments[i].rl_mw = r;
- if (unlikely(i-- == 0))
- return req; /* Success */
+ spin_lock(&buf->rb_mwlock);
+ if (!list_empty(&buf->rb_mws)) {
+ mw = list_first_entry(&buf->rb_mws,
+ struct rpcrdma_mw, mw_list);
+ list_del_init(&mw->mw_list);
}
+ spin_unlock(&buf->rb_mwlock);
- /* Not enough entries on rb_mws for this req */
- rpcrdma_buffer_put_sendbuf(req, buf);
- rpcrdma_buffer_put_mrs(req, buf);
- return NULL;
+ if (!mw)
+ pr_err("RPC: %s: no MWs available\n", __func__);
+ return mw;
}
-static struct rpcrdma_req *
-rpcrdma_buffer_get_fmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
+void
+rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)
{
- struct rpcrdma_mw *r;
- int i;
-
- i = RPCRDMA_MAX_SEGS - 1;
- while (!list_empty(&buf->rb_mws)) {
- r = list_entry(buf->rb_mws.next,
- struct rpcrdma_mw, mw_list);
- list_del(&r->mw_list);
- req->rl_segments[i].rl_mw = r;
- if (unlikely(i-- == 0))
- return req; /* Success */
- }
+ struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
- /* Not enough entries on rb_mws for this req */
- rpcrdma_buffer_put_sendbuf(req, buf);
- rpcrdma_buffer_put_mrs(req, buf);
- return NULL;
+ spin_lock(&buf->rb_mwlock);
+ list_add_tail(&mw->mw_list, &buf->rb_mws);
+ spin_unlock(&buf->rb_mwlock);
}
/*
* 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.
+ * Reply buffer (if available) is attached to send buffer upon return.
*/
struct rpcrdma_req *
rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
{
- struct rpcrdma_ia *ia = rdmab_to_ia(buffers);
- struct list_head stale;
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;
+ spin_lock(&buffers->rb_lock);
+ if (list_empty(&buffers->rb_send_bufs))
+ goto out_reqbuf;
+ req = rpcrdma_buffer_get_req_locked(buffers);
+ if (list_empty(&buffers->rb_recv_bufs))
+ goto out_repbuf;
+ req->rl_reply = rpcrdma_buffer_get_rep_locked(buffers);
+ spin_unlock(&buffers->rb_lock);
+ return req;
- INIT_LIST_HEAD(&stale);
- switch (ia->ri_memreg_strategy) {
- case RPCRDMA_FRMR:
- req = rpcrdma_buffer_get_frmrs(req, buffers, &stale);
- break;
- case RPCRDMA_MTHCAFMR:
- req = rpcrdma_buffer_get_fmrs(req, buffers);
- break;
- default:
- break;
- }
- spin_unlock_irqrestore(&buffers->rb_lock, flags);
- if (!list_empty(&stale))
- rpcrdma_retry_flushed_linv(&stale, buffers);
+out_reqbuf:
+ spin_unlock(&buffers->rb_lock);
+ pr_warn("RPC: %s: out of request buffers\n", __func__);
+ return NULL;
+out_repbuf:
+ spin_unlock(&buffers->rb_lock);
+ pr_warn("RPC: %s: out of reply buffers\n", __func__);
+ req->rl_reply = NULL;
return req;
}
rpcrdma_buffer_put(struct rpcrdma_req *req)
{
struct rpcrdma_buffer *buffers = req->rl_buffer;
- struct rpcrdma_ia *ia = rdmab_to_ia(buffers);
- unsigned long flags;
+ struct rpcrdma_rep *rep = req->rl_reply;
- spin_lock_irqsave(&buffers->rb_lock, flags);
- rpcrdma_buffer_put_sendbuf(req, buffers);
- switch (ia->ri_memreg_strategy) {
- case RPCRDMA_FRMR:
- case RPCRDMA_MTHCAFMR:
- rpcrdma_buffer_put_mrs(req, buffers);
- break;
- default:
- break;
- }
- spin_unlock_irqrestore(&buffers->rb_lock, flags);
+ req->rl_niovs = 0;
+ req->rl_reply = NULL;
+
+ spin_lock(&buffers->rb_lock);
+ list_add_tail(&req->rl_free, &buffers->rb_send_bufs);
+ if (rep)
+ list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
+ spin_unlock(&buffers->rb_lock);
}
/*
* Recover reply buffers from pool.
- * This happens when recovering from error conditions.
- * Post-increment counter/array index.
+ * This happens when recovering from disconnect.
*/
void
rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
{
struct rpcrdma_buffer *buffers = req->rl_buffer;
- unsigned long flags;
- 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);
+ spin_lock(&buffers->rb_lock);
+ if (!list_empty(&buffers->rb_recv_bufs))
+ req->rl_reply = rpcrdma_buffer_get_rep_locked(buffers);
+ spin_unlock(&buffers->rb_lock);
}
/*
void
rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
{
- struct rpcrdma_buffer *buffers = rep->rr_buffer;
- unsigned long flags;
+ struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
- 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);
+ spin_lock(&buffers->rb_lock);
+ list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
+ spin_unlock(&buffers->rb_lock);
}
/*
(unsigned long long)seg->mr_dma, seg->mr_dmalen);
}
-static 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);
- if (ib_dma_mapping_error(ia->ri_id->device, iov->addr))
- return -ENOMEM;
-
- iov->length = len;
-
- if (ia->ri_have_dma_lkey) {
- *mrp = NULL;
- iov->lkey = ia->ri_dma_lkey;
- return 0;
- } else 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;
-}
-
-static 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;
-}
-
/**
* rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers
* @ia: controlling rpcrdma_ia
rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags)
{
struct rpcrdma_regbuf *rb;
- int rc;
+ struct ib_sge *iov;
- rc = -ENOMEM;
rb = kmalloc(sizeof(*rb) + size, flags);
if (rb == NULL)
goto out;
- rb->rg_size = size;
- rb->rg_owner = NULL;
- rc = rpcrdma_register_internal(ia, rb->rg_base, size,
- &rb->rg_mr, &rb->rg_iov);
- if (rc)
+ iov = &rb->rg_iov;
+ iov->addr = ib_dma_map_single(ia->ri_device,
+ (void *)rb->rg_base, size,
+ DMA_BIDIRECTIONAL);
+ if (ib_dma_mapping_error(ia->ri_device, iov->addr))
goto out_free;
+ iov->length = size;
+ iov->lkey = ia->ri_pd->local_dma_lkey;
+ rb->rg_size = size;
+ rb->rg_owner = NULL;
return rb;
out_free:
kfree(rb);
out:
- return ERR_PTR(rc);
+ return ERR_PTR(-ENOMEM);
}
/**
void
rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
{
- if (rb) {
- rpcrdma_deregister_internal(ia, rb->rg_mr, &rb->rg_iov);
- kfree(rb);
- }
+ struct ib_sge *iov;
+
+ if (!rb)
+ return;
+
+ iov = &rb->rg_iov;
+ ib_dma_unmap_single(ia->ri_device,
+ iov->addr, iov->length, DMA_BIDIRECTIONAL);
+ kfree(rb);
}
/*
struct rpcrdma_ep *ep,
struct rpcrdma_req *req)
{
+ struct ib_device *device = ia->ri_device;
struct ib_send_wr send_wr, *send_wr_fail;
struct rpcrdma_rep *rep = req->rl_reply;
- int rc;
+ struct ib_sge *iov = req->rl_send_iov;
+ int i, rc;
if (rep) {
rc = rpcrdma_ep_post_recv(ia, ep, rep);
send_wr.next = NULL;
send_wr.wr_id = RPCRDMA_IGNORE_COMPLETION;
- send_wr.sg_list = req->rl_send_iov;
+ send_wr.sg_list = iov;
send_wr.num_sge = req->rl_niovs;
send_wr.opcode = IB_WR_SEND;
- 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);
+
+ for (i = 0; i < send_wr.num_sge; i++)
+ ib_dma_sync_single_for_device(device, iov[i].addr,
+ iov[i].length, DMA_TO_DEVICE);
+ dprintk("RPC: %s: posting %d s/g entries\n",
+ __func__, send_wr.num_sge);
if (DECR_CQCOUNT(ep) > 0)
send_wr.send_flags = 0;
recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
recv_wr.num_sge = 1;
- ib_dma_sync_single_for_cpu(ia->ri_id->device,
+ ib_dma_sync_single_for_cpu(ia->ri_device,
rdmab_addr(rep->rr_rdmabuf),
rdmab_length(rep->rr_rdmabuf),
DMA_BIDIRECTIONAL);
return rc;
}
+/**
+ * rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests
+ * @r_xprt: transport associated with these backchannel resources
+ * @min_reqs: minimum number of incoming requests expected
+ *
+ * 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)
+{
+ struct rpcrdma_buffer *buffers = &r_xprt->rx_buf;
+ struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+ struct rpcrdma_ep *ep = &r_xprt->rx_ep;
+ struct rpcrdma_rep *rep;
+ unsigned long flags;
+ int rc;
+
+ while (count--) {
+ spin_lock_irqsave(&buffers->rb_lock, flags);
+ if (list_empty(&buffers->rb_recv_bufs))
+ goto out_reqbuf;
+ rep = rpcrdma_buffer_get_rep_locked(buffers);
+ spin_unlock_irqrestore(&buffers->rb_lock, flags);
+
+ rc = rpcrdma_ep_post_recv(ia, ep, rep);
+ if (rc)
+ goto out_rc;
+ }
+
+ return 0;
+
+out_reqbuf:
+ spin_unlock_irqrestore(&buffers->rb_lock, flags);
+ pr_warn("%s: no extra receive buffers\n", __func__);
+ return -ENOMEM;
+
+out_rc:
+ rpcrdma_recv_buffer_put(rep);
+ return rc;
+}
+
/* How many chunk list items fit within our inline buffers?
*/
unsigned int
Code Review / kvmfornfv.git / blobdiff