--- /dev/null
+/*
+ * 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/interrupt.h>
+#include <linux/slab.h>
+#include <linux/prefetch.h>
+#include <linux/sunrpc/addr.h>
+#include <asm/bitops.h>
+
+#include "xprt_rdma.h"
+
+/*
+ * Globals/Macros
+ */
+
+#if IS_ENABLED(CONFIG_SUNRPC_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 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")
+
+static void
+rpcrdma_schedule_tasklet(struct list_head *sched_list)
+{
+ unsigned long flags;
+
+ 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);
+}
+
+static void
+rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
+{
+ struct rpcrdma_ep *ep = context;
+
+ pr_err("RPC: %s: %s on device %s ep %p\n",
+ __func__, ASYNC_MSG(event->event),
+ event->device->name, context);
+ if (ep->rep_connected == 1) {
+ ep->rep_connected = -EIO;
+ rpcrdma_conn_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;
+
+ pr_err("RPC: %s: %s on device %s ep %p\n",
+ __func__, ASYNC_MSG(event->event),
+ event->device->name, context);
+ if (ep->rep_connected == 1) {
+ ep->rep_connected = -EIO;
+ rpcrdma_conn_func(ep);
+ wake_up_all(&ep->rep_connect_wait);
+ }
+}
+
+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)
+{
+ /* WARNING: Only wr_id and status are reliable at this point */
+ if (wc->wr_id == RPCRDMA_IGNORE_COMPLETION) {
+ 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));
+ } else {
+ struct rpcrdma_mw *r;
+
+ r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
+ r->mw_sendcompletion(wc);
+ }
+}
+
+static int
+rpcrdma_sendcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep)
+{
+ struct ib_wc *wcs;
+ int budget, count, rc;
+
+ budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE;
+ do {
+ wcs = ep->rep_send_wcs;
+
+ rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs);
+ if (rc <= 0)
+ return rc;
+
+ count = rc;
+ while (count-- > 0)
+ rpcrdma_sendcq_process_wc(wcs++);
+ } while (rc == RPCRDMA_POLLSIZE && --budget);
+ return 0;
+}
+
+/*
+ * 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.
+ */
+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;
+ }
+
+ 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_sendcq_poll(cq, ep);
+}
+
+static void
+rpcrdma_recvcq_process_wc(struct ib_wc *wc, struct list_head *sched_list)
+{
+ struct rpcrdma_rep *rep =
+ (struct rpcrdma_rep *)(unsigned long)wc->wr_id;
+
+ /* WARNING: Only wr_id and status are reliable at this point */
+ if (wc->status != IB_WC_SUCCESS)
+ goto out_fail;
+
+ /* status == SUCCESS means all fields in wc are trustworthy */
+ if (wc->opcode != IB_WC_RECV)
+ return;
+
+ dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n",
+ __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,
+ 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);
+ 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;
+ goto out_schedule;
+}
+
+static int
+rpcrdma_recvcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep)
+{
+ struct list_head sched_list;
+ struct ib_wc *wcs;
+ int budget, count, rc;
+
+ INIT_LIST_HEAD(&sched_list);
+ budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE;
+ do {
+ wcs = ep->rep_recv_wcs;
+
+ rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs);
+ if (rc <= 0)
+ goto out_schedule;
+
+ 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;
+}
+
+/*
+ * 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.
+ */
+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);
+}
+
+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);
+ 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)
+{
+ struct rpcrdma_xprt *xprt = id->context;
+ struct rpcrdma_ia *ia = &xprt->rx_ia;
+ struct rpcrdma_ep *ep = &xprt->rx_ep;
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+ struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr;
+#endif
+ struct ib_qp_attr *attr = &ia->ri_qp_attr;
+ struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr;
+ int connstate = 0;
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ case RDMA_CM_EVENT_ROUTE_RESOLVED:
+ ia->ri_async_rc = 0;
+ 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: %sconnected\n",
+ __func__, connstate > 0 ? "" : "dis");
+ ep->rep_connected = connstate;
+ rpcrdma_conn_func(ep);
+ wake_up_all(&ep->rep_connect_wait);
+ /*FALLTHROUGH*/
+ default:
+ dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n",
+ __func__, sap, rpc_get_port(sap), ep,
+ CONNECTION_MSG(event->event));
+ break;
+ }
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+ if (connstate == 1) {
+ int ird = attr->max_dest_rd_atomic;
+ int tird = ep->rep_remote_cma.responder_resources;
+
+ 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_ops->ro_displayname,
+ xprt->rx_buf.rb_max_requests,
+ ird, ird < 4 && ird < tird / 2 ? " (low!)" : "");
+ } else if (connstate < 0) {
+ pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n",
+ sap, rpc_get_port(sap), connstate);
+ }
+#endif
+
+ 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;
+
+ init_completion(&ia->ri_done);
+
+ id = rdma_create_id(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",
+ __func__, rc);
+ return id;
+ }
+
+ ia->ri_async_rc = -ETIMEDOUT;
+ 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_interruptible_timeout(&ia->ri_done,
+ msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
+ rc = ia->ri_async_rc;
+ if (rc)
+ goto out;
+
+ ia->ri_async_rc = -ETIMEDOUT;
+ 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_interruptible_timeout(&ia->ri_done,
+ msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
+ 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, mem_priv;
+ struct rpcrdma_ia *ia = &xprt->rx_ia;
+ struct ib_device_attr *devattr = &ia->ri_devattr;
+
+ 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;
+ }
+
+ rc = ib_query_device(ia->ri_id->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)) {
+ 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) {
+ dprintk("RPC: %s: MTHCAFMR registration "
+ "not supported by HCA\n", __func__);
+ memreg = RPCRDMA_ALLPHYSICAL;
+ }
+ }
+
+ /*
+ * 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;
+ 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 "
+ "registration mode: %d\n", memreg);
+ rc = -ENOMEM;
+ goto out3;
+ }
+ 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;
+
+out3:
+ ib_dealloc_pd(ia->ri_pd);
+ ia->ri_pd = NULL;
+out2:
+ rdma_destroy_id(ia->ri_id);
+ ia->ri_id = NULL;
+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)) {
+ if (ia->ri_id->qp)
+ rdma_destroy_qp(ia->ri_id);
+ rdma_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);
+ }
+}
+
+/*
+ * 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 = &ia->ri_devattr;
+ struct ib_cq *sendcq, *recvcq;
+ int rc, err;
+
+ /* 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;
+ ep->rep_attr.srq = NULL;
+ ep->rep_attr.cap.max_send_wr = cdata->max_requests;
+ 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_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__,
+ 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;
+ if (ep->rep_cqinit > RPCRDMA_MAX_UNSIGNALED_SENDS)
+ ep->rep_cqinit = RPCRDMA_MAX_UNSIGNALED_SENDS;
+ else if (ep->rep_cqinit <= 2)
+ ep->rep_cqinit = 0;
+ INIT_CQCOUNT(ep);
+ 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);
+ if (IS_ERR(sendcq)) {
+ rc = PTR_ERR(sendcq);
+ dprintk("RPC: %s: failed to create send CQ: %i\n",
+ __func__, rc);
+ goto out1;
+ }
+
+ rc = ib_req_notify_cq(sendcq, IB_CQ_NEXT_COMP);
+ if (rc) {
+ dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
+ __func__, rc);
+ 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);
+ if (IS_ERR(recvcq)) {
+ rc = PTR_ERR(recvcq);
+ dprintk("RPC: %s: failed to create recv CQ: %i\n",
+ __func__, rc);
+ goto out2;
+ }
+
+ rc = ib_req_notify_cq(recvcq, IB_CQ_NEXT_COMP);
+ if (rc) {
+ dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
+ __func__, rc);
+ ib_destroy_cq(recvcq);
+ goto out2;
+ }
+
+ ep->rep_attr.send_cq = sendcq;
+ ep->rep_attr.recv_cq = recvcq;
+
+ /* 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 */
+ ep->rep_remote_cma.initiator_depth = 0;
+ if (devattr->max_qp_rd_atom > 32) /* arbitrary but <= 255 */
+ ep->rep_remote_cma.responder_resources = 32;
+ else
+ ep->rep_remote_cma.responder_resources =
+ devattr->max_qp_rd_atom;
+
+ 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:
+ err = ib_destroy_cq(sendcq);
+ if (err)
+ dprintk("RPC: %s: ib_destroy_cq returned %i\n",
+ __func__, err);
+out1:
+ rpcrdma_free_regbuf(ia, ep->rep_padbuf);
+ 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.
+ */
+void
+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);
+
+ cancel_delayed_work_sync(&ep->rep_connect_worker);
+
+ if (ia->ri_id->qp) {
+ rpcrdma_ep_disconnect(ep, ia);
+ 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);
+}
+
+/*
+ * Connect unconnected endpoint.
+ */
+int
+rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
+{
+ struct rdma_cm_id *id, *old;
+ int rc = 0;
+ int retry_count = 0;
+
+ if (ep->rep_connected != 0) {
+ struct rpcrdma_xprt *xprt;
+retry:
+ dprintk("RPC: %s: reconnecting...\n", __func__);
+
+ rpcrdma_ep_disconnect(ep, ia);
+ 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)) {
+ rc = -EHOSTUNREACH;
+ 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 = -ENETUNREACH;
+ goto out;
+ }
+ /* END TEMP */
+ rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
+ if (rc) {
+ dprintk("RPC: %s: rdma_create_qp failed %i\n",
+ __func__, rc);
+ rdma_destroy_id(id);
+ rc = -ENETUNREACH;
+ goto out;
+ }
+
+ write_lock(&ia->ri_qplock);
+ old = ia->ri_id;
+ ia->ri_id = id;
+ write_unlock(&ia->ri_qplock);
+
+ rdma_destroy_qp(old);
+ rdma_destroy_id(old);
+ } else {
+ dprintk("RPC: %s: connecting...\n", __func__);
+ 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);
+ /* do not update ep->rep_connected */
+ return -ENETUNREACH;
+ }
+ }
+
+ 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;
+ }
+
+ 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. */
+ if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 &&
+ (ep->rep_remote_cma.responder_resources == 0 ||
+ ep->rep_remote_cma.initiator_depth !=
+ ep->rep_remote_cma.responder_resources)) {
+ if (ep->rep_remote_cma.responder_resources == 0)
+ ep->rep_remote_cma.responder_resources = 1;
+ ep->rep_remote_cma.initiator_depth =
+ ep->rep_remote_cma.responder_resources;
+ 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.
+ */
+void
+rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
+{
+ int rc;
+
+ rpcrdma_flush_cqs(ep);
+ 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;
+ }
+}
+
+static struct rpcrdma_req *
+rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
+{
+ struct rpcrdma_req *req;
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (req == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ req->rl_buffer = &r_xprt->rx_buf;
+ return req;
+}
+
+static struct rpcrdma_rep *
+rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
+{
+ struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
+ struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+ struct rpcrdma_rep *rep;
+ int rc;
+
+ rc = -ENOMEM;
+ rep = kzalloc(sizeof(*rep), GFP_KERNEL);
+ if (rep == NULL)
+ goto out;
+
+ rep->rr_rdmabuf = rpcrdma_alloc_regbuf(ia, cdata->inline_rsize,
+ GFP_KERNEL);
+ if (IS_ERR(rep->rr_rdmabuf)) {
+ rc = PTR_ERR(rep->rr_rdmabuf);
+ goto out_free;
+ }
+
+ rep->rr_buffer = &r_xprt->rx_buf;
+ return rep;
+
+out_free:
+ kfree(rep);
+out:
+ return ERR_PTR(rc);
+}
+
+int
+rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
+{
+ 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;
+ 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;
+
+ 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)) {
+ dprintk("RPC: %s: request buffer %d alloc"
+ " failed\n", __func__, i);
+ rc = PTR_ERR(req);
+ goto out;
+ }
+ buf->rb_send_bufs[i] = req;
+
+ rep = rpcrdma_create_rep(r_xprt);
+ if (IS_ERR(rep)) {
+ dprintk("RPC: %s: reply buffer %d alloc failed\n",
+ __func__, i);
+ rc = PTR_ERR(rep);
+ goto out;
+ }
+ buf->rb_recv_bufs[i] = rep;
+ }
+
+ return 0;
+out:
+ rpcrdma_buffer_destroy(buf);
+ return rc;
+}
+
+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
+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);
+}
+
+void
+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);
+}
+
+/* "*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;
+ }
+}
+
+/* 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;
+
+ 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);
+}
+
+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;
+ }
+}
+
+/* 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);
+
+ 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);
+ }
+}
+
+static void
+rpcrdma_retry_flushed_linv(struct list_head *stale,
+ struct rpcrdma_buffer *buf)
+{
+ 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);
+}
+
+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 */
+ }
+
+ /* Not enough entries on rb_mws for this req */
+ rpcrdma_buffer_put_sendbuf(req, buf);
+ rpcrdma_buffer_put_mrs(req, buf);
+ return NULL;
+}
+
+static struct rpcrdma_req *
+rpcrdma_buffer_get_fmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
+{
+ 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 */
+ }
+
+ /* Not enough entries on rb_mws for this req */
+ rpcrdma_buffer_put_sendbuf(req, buf);
+ rpcrdma_buffer_put_mrs(req, buf);
+ return NULL;
+}
+
+/*
+ * 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_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;
+
+ 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);
+ 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);
+ unsigned long flags;
+
+ 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);
+}
+
+/*
+ * 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;
+
+ 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.
+ */
+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.
+ */
+
+void
+rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg)
+{
+ dprintk("RPC: map_one: offset %p iova %llx len %zu\n",
+ seg->mr_offset,
+ (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
+ * @size: size of buffer to be allocated, in bytes
+ * @flags: GFP flags
+ *
+ * Returns pointer to private header of an area of internally
+ * registered memory, or an ERR_PTR. The registered buffer follows
+ * the end of the private header.
+ *
+ * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
+ * receiving the payload of RDMA RECV operations. regbufs are not
+ * used for RDMA READ/WRITE operations, thus are registered only for
+ * LOCAL access.
+ */
+struct rpcrdma_regbuf *
+rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags)
+{
+ struct rpcrdma_regbuf *rb;
+ int rc;
+
+ 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)
+ goto out_free;
+
+ return rb;
+
+out_free:
+ kfree(rb);
+out:
+ return ERR_PTR(rc);
+}
+
+/**
+ * rpcrdma_free_regbuf - deregister and free registered buffer
+ * @ia: controlling rpcrdma_ia
+ * @rb: regbuf to be deregistered and freed
+ */
+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);
+ }
+}
+
+/*
+ * 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 = RPCRDMA_IGNORE_COMPLETION;
+ send_wr.sg_list = req->rl_send_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);
+
+ 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_rdmabuf->rg_iov;
+ recv_wr.num_sge = 1;
+
+ ib_dma_sync_single_for_cpu(ia->ri_id->device,
+ rdmab_addr(rep->rr_rdmabuf),
+ rdmab_length(rep->rr_rdmabuf),
+ DMA_BIDIRECTIONAL);
+
+ 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;
+}
+
+/* How many chunk list items fit within our inline buffers?
+ */
+unsigned int
+rpcrdma_max_segments(struct rpcrdma_xprt *r_xprt)
+{
+ struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
+ int bytes, segments;
+
+ bytes = min_t(unsigned int, cdata->inline_wsize, cdata->inline_rsize);
+ bytes -= RPCRDMA_HDRLEN_MIN;
+ if (bytes < sizeof(struct rpcrdma_segment) * 2) {
+ pr_warn("RPC: %s: inline threshold too small\n",
+ __func__);
+ return 0;
+ }
+
+ segments = 1 << (fls(bytes / sizeof(struct rpcrdma_segment)) - 1);
+ dprintk("RPC: %s: max chunk list size = %d segments\n",
+ __func__, segments);
+ return segments;
+}
Code Review / kvmfornfv.git / blobdiff