--- /dev/null
+/*
+ * Copyright (c) 2006 Oracle. 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
+ * OpenIB.org BSD 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.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <linux/if.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/if_arp.h>
+#include <linux/delay.h>
+
+#include "rds.h"
+#include "ib.h"
+
+unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
+unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
+
+module_param(fmr_pool_size, int, 0444);
+MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
+module_param(fmr_message_size, int, 0444);
+MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
+
+struct list_head rds_ib_devices;
+
+DEFINE_SPINLOCK(ib_nodev_conns_lock);
+LIST_HEAD(ib_nodev_conns);
+
+void rds_ib_add_one(struct ib_device *device)
+{
+ struct rds_ib_device *rds_ibdev;
+ struct ib_device_attr *dev_attr;
+
+ /* Only handle IB (no iWARP) devices */
+ if (device->node_type != RDMA_NODE_IB_CA)
+ return;
+
+ dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
+ if (!dev_attr)
+ return;
+
+ if (ib_query_device(device, dev_attr)) {
+ rdsdebug("Query device failed for %s\n", device->name);
+ goto free_attr;
+ }
+
+ rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
+ if (!rds_ibdev)
+ goto free_attr;
+
+ spin_lock_init(&rds_ibdev->spinlock);
+
+ rds_ibdev->max_wrs = dev_attr->max_qp_wr;
+ rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
+
+ rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
+ rds_ibdev->fmr_page_size = 1 << rds_ibdev->fmr_page_shift;
+ rds_ibdev->fmr_page_mask = ~((u64) rds_ibdev->fmr_page_size - 1);
+ rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
+ rds_ibdev->max_fmrs = dev_attr->max_fmr ?
+ min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
+ fmr_pool_size;
+
+ rds_ibdev->dev = device;
+ rds_ibdev->pd = ib_alloc_pd(device);
+ if (IS_ERR(rds_ibdev->pd))
+ goto free_dev;
+
+ rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd,
+ IB_ACCESS_LOCAL_WRITE);
+ if (IS_ERR(rds_ibdev->mr))
+ goto err_pd;
+
+ rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
+ if (IS_ERR(rds_ibdev->mr_pool)) {
+ rds_ibdev->mr_pool = NULL;
+ goto err_mr;
+ }
+
+ INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
+ INIT_LIST_HEAD(&rds_ibdev->conn_list);
+ list_add_tail(&rds_ibdev->list, &rds_ib_devices);
+
+ ib_set_client_data(device, &rds_ib_client, rds_ibdev);
+
+ goto free_attr;
+
+err_mr:
+ ib_dereg_mr(rds_ibdev->mr);
+err_pd:
+ ib_dealloc_pd(rds_ibdev->pd);
+free_dev:
+ kfree(rds_ibdev);
+free_attr:
+ kfree(dev_attr);
+}
+
+void rds_ib_remove_one(struct ib_device *device)
+{
+ struct rds_ib_device *rds_ibdev;
+ struct rds_ib_ipaddr *i_ipaddr, *i_next;
+
+ rds_ibdev = ib_get_client_data(device, &rds_ib_client);
+ if (!rds_ibdev)
+ return;
+
+ list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
+ list_del(&i_ipaddr->list);
+ kfree(i_ipaddr);
+ }
+
+ rds_ib_remove_conns(rds_ibdev);
+
+ if (rds_ibdev->mr_pool)
+ rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
+
+ ib_dereg_mr(rds_ibdev->mr);
+
+ while (ib_dealloc_pd(rds_ibdev->pd)) {
+ rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd);
+ msleep(1);
+ }
+
+ list_del(&rds_ibdev->list);
+ kfree(rds_ibdev);
+}
+
+struct ib_client rds_ib_client = {
+ .name = "rds_ib",
+ .add = rds_ib_add_one,
+ .remove = rds_ib_remove_one
+};
+
+static int rds_ib_conn_info_visitor(struct rds_connection *conn,
+ void *buffer)
+{
+ struct rds_info_rdma_connection *iinfo = buffer;
+ struct rds_ib_connection *ic;
+
+ /* We will only ever look at IB transports */
+ if (conn->c_trans != &rds_ib_transport)
+ return 0;
+
+ iinfo->src_addr = conn->c_laddr;
+ iinfo->dst_addr = conn->c_faddr;
+
+ memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
+ memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
+ if (rds_conn_state(conn) == RDS_CONN_UP) {
+ struct rds_ib_device *rds_ibdev;
+ struct rdma_dev_addr *dev_addr;
+
+ ic = conn->c_transport_data;
+ dev_addr = &ic->i_cm_id->route.addr.dev_addr;
+
+ ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
+ ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
+
+ rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
+ iinfo->max_send_wr = ic->i_send_ring.w_nr;
+ iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
+ iinfo->max_send_sge = rds_ibdev->max_sge;
+ rds_ib_get_mr_info(rds_ibdev, iinfo);
+ }
+ return 1;
+}
+
+static void rds_ib_ic_info(struct socket *sock, unsigned int len,
+ struct rds_info_iterator *iter,
+ struct rds_info_lengths *lens)
+{
+ rds_for_each_conn_info(sock, len, iter, lens,
+ rds_ib_conn_info_visitor,
+ sizeof(struct rds_info_rdma_connection));
+}
+
+
+/*
+ * Early RDS/IB was built to only bind to an address if there is an IPoIB
+ * device with that address set.
+ *
+ * If it were me, I'd advocate for something more flexible. Sending and
+ * receiving should be device-agnostic. Transports would try and maintain
+ * connections between peers who have messages queued. Userspace would be
+ * allowed to influence which paths have priority. We could call userspace
+ * asserting this policy "routing".
+ */
+static int rds_ib_laddr_check(__be32 addr)
+{
+ int ret;
+ struct rdma_cm_id *cm_id;
+ struct sockaddr_in sin;
+
+ /* Create a CMA ID and try to bind it. This catches both
+ * IB and iWARP capable NICs.
+ */
+ cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
+ if (!cm_id)
+ return -EADDRNOTAVAIL;
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = addr;
+
+ /* rdma_bind_addr will only succeed for IB & iWARP devices */
+ ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
+ /* due to this, we will claim to support iWARP devices unless we
+ check node_type. */
+ if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA)
+ ret = -EADDRNOTAVAIL;
+
+ rdsdebug("addr %pI4 ret %d node type %d\n",
+ &addr, ret,
+ cm_id->device ? cm_id->device->node_type : -1);
+
+ rdma_destroy_id(cm_id);
+
+ return ret;
+}
+
+void rds_ib_exit(void)
+{
+ rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
+ rds_ib_remove_nodev_conns();
+ ib_unregister_client(&rds_ib_client);
+ rds_ib_sysctl_exit();
+ rds_ib_recv_exit();
+ rds_trans_unregister(&rds_ib_transport);
+}
+
+struct rds_transport rds_ib_transport = {
+ .laddr_check = rds_ib_laddr_check,
+ .xmit_complete = rds_ib_xmit_complete,
+ .xmit = rds_ib_xmit,
+ .xmit_cong_map = NULL,
+ .xmit_rdma = rds_ib_xmit_rdma,
+ .recv = rds_ib_recv,
+ .conn_alloc = rds_ib_conn_alloc,
+ .conn_free = rds_ib_conn_free,
+ .conn_connect = rds_ib_conn_connect,
+ .conn_shutdown = rds_ib_conn_shutdown,
+ .inc_copy_to_user = rds_ib_inc_copy_to_user,
+ .inc_purge = rds_ib_inc_purge,
+ .inc_free = rds_ib_inc_free,
+ .cm_initiate_connect = rds_ib_cm_initiate_connect,
+ .cm_handle_connect = rds_ib_cm_handle_connect,
+ .cm_connect_complete = rds_ib_cm_connect_complete,
+ .stats_info_copy = rds_ib_stats_info_copy,
+ .exit = rds_ib_exit,
+ .get_mr = rds_ib_get_mr,
+ .sync_mr = rds_ib_sync_mr,
+ .free_mr = rds_ib_free_mr,
+ .flush_mrs = rds_ib_flush_mrs,
+ .t_owner = THIS_MODULE,
+ .t_name = "infiniband",
+};
+
+int __init rds_ib_init(void)
+{
+ int ret;
+
+ INIT_LIST_HEAD(&rds_ib_devices);
+
+ ret = ib_register_client(&rds_ib_client);
+ if (ret)
+ goto out;
+
+ ret = rds_ib_sysctl_init();
+ if (ret)
+ goto out_ibreg;
+
+ ret = rds_ib_recv_init();
+ if (ret)
+ goto out_sysctl;
+
+ ret = rds_trans_register(&rds_ib_transport);
+ if (ret)
+ goto out_recv;
+
+ rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
+
+ goto out;
+
+out_recv:
+ rds_ib_recv_exit();
+out_sysctl:
+ rds_ib_sysctl_exit();
+out_ibreg:
+ ib_unregister_client(&rds_ib_client);
+out:
+ return ret;
+}
+
+MODULE_LICENSE("GPL");
+
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