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-rw-r--r--net/sunrpc/xprtrdma/svc_rdma.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma.c b/net/sunrpc/xprtrdma/svc_rdma.c
new file mode 100644
index 0000000000..f0d5eeed4c
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+++ b/net/sunrpc/xprtrdma/svc_rdma.c
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+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (c) 2015-2018 Oracle. All rights reserved.
+ * Copyright (c) 2005-2006 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.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/sysctl.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY RPCDBG_SVCXPRT
+
+/* RPC/RDMA parameters */
+unsigned int svcrdma_ord = 16; /* historical default */
+static unsigned int min_ord = 1;
+static unsigned int max_ord = 255;
+unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
+unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS;
+static unsigned int min_max_requests = 4;
+static unsigned int max_max_requests = 16384;
+unsigned int svcrdma_max_req_size = RPCRDMA_DEF_INLINE_THRESH;
+static unsigned int min_max_inline = RPCRDMA_DEF_INLINE_THRESH;
+static unsigned int max_max_inline = RPCRDMA_MAX_INLINE_THRESH;
+static unsigned int svcrdma_stat_unused;
+static unsigned int zero;
+
+struct percpu_counter svcrdma_stat_read;
+struct percpu_counter svcrdma_stat_recv;
+struct percpu_counter svcrdma_stat_sq_starve;
+struct percpu_counter svcrdma_stat_write;
+
+enum {
+ SVCRDMA_COUNTER_BUFSIZ = sizeof(unsigned long long),
+};
+
+static int svcrdma_counter_handler(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct percpu_counter *stat = (struct percpu_counter *)table->data;
+ char tmp[SVCRDMA_COUNTER_BUFSIZ + 1];
+ int len;
+
+ if (write) {
+ percpu_counter_set(stat, 0);
+ return 0;
+ }
+
+ len = snprintf(tmp, SVCRDMA_COUNTER_BUFSIZ, "%lld\n",
+ percpu_counter_sum_positive(stat));
+ if (len >= SVCRDMA_COUNTER_BUFSIZ)
+ return -EFAULT;
+ len = strlen(tmp);
+ if (*ppos > len) {
+ *lenp = 0;
+ return 0;
+ }
+ len -= *ppos;
+ if (len > *lenp)
+ len = *lenp;
+ if (len)
+ memcpy(buffer, tmp, len);
+ *lenp = len;
+ *ppos += len;
+
+ return 0;
+}
+
+static struct ctl_table_header *svcrdma_table_header;
+static struct ctl_table svcrdma_parm_table[] = {
+ {
+ .procname = "max_requests",
+ .data = &svcrdma_max_requests,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_max_requests,
+ .extra2 = &max_max_requests
+ },
+ {
+ .procname = "max_req_size",
+ .data = &svcrdma_max_req_size,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_max_inline,
+ .extra2 = &max_max_inline
+ },
+ {
+ .procname = "max_outbound_read_requests",
+ .data = &svcrdma_ord,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_ord,
+ .extra2 = &max_ord,
+ },
+
+ {
+ .procname = "rdma_stat_read",
+ .data = &svcrdma_stat_read,
+ .maxlen = SVCRDMA_COUNTER_BUFSIZ,
+ .mode = 0644,
+ .proc_handler = svcrdma_counter_handler,
+ },
+ {
+ .procname = "rdma_stat_recv",
+ .data = &svcrdma_stat_recv,
+ .maxlen = SVCRDMA_COUNTER_BUFSIZ,
+ .mode = 0644,
+ .proc_handler = svcrdma_counter_handler,
+ },
+ {
+ .procname = "rdma_stat_write",
+ .data = &svcrdma_stat_write,
+ .maxlen = SVCRDMA_COUNTER_BUFSIZ,
+ .mode = 0644,
+ .proc_handler = svcrdma_counter_handler,
+ },
+ {
+ .procname = "rdma_stat_sq_starve",
+ .data = &svcrdma_stat_sq_starve,
+ .maxlen = SVCRDMA_COUNTER_BUFSIZ,
+ .mode = 0644,
+ .proc_handler = svcrdma_counter_handler,
+ },
+ {
+ .procname = "rdma_stat_rq_starve",
+ .data = &svcrdma_stat_unused,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &zero,
+ },
+ {
+ .procname = "rdma_stat_rq_poll",
+ .data = &svcrdma_stat_unused,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &zero,
+ },
+ {
+ .procname = "rdma_stat_rq_prod",
+ .data = &svcrdma_stat_unused,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &zero,
+ },
+ {
+ .procname = "rdma_stat_sq_poll",
+ .data = &svcrdma_stat_unused,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &zero,
+ },
+ {
+ .procname = "rdma_stat_sq_prod",
+ .data = &svcrdma_stat_unused,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &zero,
+ },
+ { },
+};
+
+static void svc_rdma_proc_cleanup(void)
+{
+ if (!svcrdma_table_header)
+ return;
+ unregister_sysctl_table(svcrdma_table_header);
+ svcrdma_table_header = NULL;
+
+ percpu_counter_destroy(&svcrdma_stat_write);
+ percpu_counter_destroy(&svcrdma_stat_sq_starve);
+ percpu_counter_destroy(&svcrdma_stat_recv);
+ percpu_counter_destroy(&svcrdma_stat_read);
+}
+
+static int svc_rdma_proc_init(void)
+{
+ int rc;
+
+ if (svcrdma_table_header)
+ return 0;
+
+ rc = percpu_counter_init(&svcrdma_stat_read, 0, GFP_KERNEL);
+ if (rc)
+ goto out_err;
+ rc = percpu_counter_init(&svcrdma_stat_recv, 0, GFP_KERNEL);
+ if (rc)
+ goto out_err;
+ rc = percpu_counter_init(&svcrdma_stat_sq_starve, 0, GFP_KERNEL);
+ if (rc)
+ goto out_err;
+ rc = percpu_counter_init(&svcrdma_stat_write, 0, GFP_KERNEL);
+ if (rc)
+ goto out_err;
+
+ svcrdma_table_header = register_sysctl("sunrpc/svc_rdma",
+ svcrdma_parm_table);
+ return 0;
+
+out_err:
+ percpu_counter_destroy(&svcrdma_stat_sq_starve);
+ percpu_counter_destroy(&svcrdma_stat_recv);
+ percpu_counter_destroy(&svcrdma_stat_read);
+ return rc;
+}
+
+void svc_rdma_cleanup(void)
+{
+ dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
+ svc_unreg_xprt_class(&svc_rdma_class);
+ svc_rdma_proc_cleanup();
+}
+
+int svc_rdma_init(void)
+{
+ int rc;
+
+ dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
+ dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
+ dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
+ dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
+ dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
+
+ rc = svc_rdma_proc_init();
+ if (rc)
+ return rc;
+
+ /* Register RDMA with the SVC transport switch */
+ svc_reg_xprt_class(&svc_rdma_class);
+ return 0;
+}