RDS/IB: Infiniband transport

Registers as an RDS transport and an IB client, and uses IB CM
API to allocate ids, queue pairs, and the rest of that fun stuff.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 323 insertions, 0 deletions

diff --git a/net/rds/ib.c b/net/rds/ib.c
new file mode 100644
index 000000000000..06a7b798d9a7
--- /dev/null
+++ b/net/rds/ib.c
@@ -0,0 +1,323 @@
+/*
+ * 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");
+