diff options
Diffstat (limited to 'net/rds/iw.c')
| -rw-r--r-- | net/rds/iw.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/net/rds/iw.c b/net/rds/iw.c new file mode 100644 index 0000000..1b56905 --- /dev/null +++ b/net/rds/iw.c @@ -0,0 +1,333 @@ +/* + * 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 "iw.h" + +unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE; +unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */ + +module_param(fastreg_pool_size, int, 0444); +MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device"); +module_param(fastreg_message_size, int, 0444); +MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)"); + +struct list_head rds_iw_devices; + +DEFINE_SPINLOCK(iw_nodev_conns_lock); +LIST_HEAD(iw_nodev_conns); + +void rds_iw_add_one(struct ib_device *device) +{ + struct rds_iw_device *rds_iwdev; + struct ib_device_attr *dev_attr; + + /* Only handle iwarp devices */ + if (device->node_type != RDMA_NODE_RNIC) + 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_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL); + if (!rds_iwdev) + goto free_attr; + + spin_lock_init(&rds_iwdev->spinlock); + + rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY); + rds_iwdev->max_wrs = dev_attr->max_qp_wr; + rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE); + + rds_iwdev->page_shift = max(PAGE_SHIFT, ffs(dev_attr->page_size_cap) - 1); + + rds_iwdev->dev = device; + rds_iwdev->pd = ib_alloc_pd(device); + if (IS_ERR(rds_iwdev->pd)) + goto free_dev; + + if (!rds_iwdev->dma_local_lkey) { + if (device->node_type != RDMA_NODE_RNIC) { + rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd, + IB_ACCESS_LOCAL_WRITE); + } else { + rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd, + IB_ACCESS_REMOTE_READ | + IB_ACCESS_REMOTE_WRITE | + IB_ACCESS_LOCAL_WRITE); + } + if (IS_ERR(rds_iwdev->mr)) + goto err_pd; + } else + rds_iwdev->mr = NULL; + + rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev); + if (IS_ERR(rds_iwdev->mr_pool)) { + rds_iwdev->mr_pool = NULL; + goto err_mr; + } + + INIT_LIST_HEAD(&rds_iwdev->cm_id_list); + INIT_LIST_HEAD(&rds_iwdev->conn_list); + list_add_tail(&rds_iwdev->list, &rds_iw_devices); + + ib_set_client_data(device, &rds_iw_client, rds_iwdev); + + goto free_attr; + +err_mr: + if (rds_iwdev->mr) + ib_dereg_mr(rds_iwdev->mr); +err_pd: + ib_dealloc_pd(rds_iwdev->pd); +free_dev: + kfree(rds_iwdev); +free_attr: + kfree(dev_attr); +} + +void rds_iw_remove_one(struct ib_device *device) +{ + struct rds_iw_device *rds_iwdev; + struct rds_iw_cm_id *i_cm_id, *next; + + rds_iwdev = ib_get_client_data(device, &rds_iw_client); + if (!rds_iwdev) + return; + + spin_lock_irq(&rds_iwdev->spinlock); + list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) { + list_del(&i_cm_id->list); + kfree(i_cm_id); + } + spin_unlock_irq(&rds_iwdev->spinlock); + + rds_iw_remove_conns(rds_iwdev); + + if (rds_iwdev->mr_pool) + rds_iw_destroy_mr_pool(rds_iwdev->mr_pool); + + if (rds_iwdev->mr) + ib_dereg_mr(rds_iwdev->mr); + + while (ib_dealloc_pd(rds_iwdev->pd)) { + rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd); + msleep(1); + } + + list_del(&rds_iwdev->list); + kfree(rds_iwdev); +} + +struct ib_client rds_iw_client = { + .name = "rds_iw", + .add = rds_iw_add_one, + .remove = rds_iw_remove_one +}; + +static int rds_iw_conn_info_visitor(struct rds_connection *conn, + void *buffer) +{ + struct rds_info_rdma_connection *iinfo = buffer; + struct rds_iw_connection *ic; + + /* We will only ever look at IB transports */ + if (conn->c_trans != &rds_iw_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_iw_device *rds_iwdev; + 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_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_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_iwdev->max_sge; + rds_iw_get_mr_info(rds_iwdev, iinfo); + } + return 1; +} + +static void rds_iw_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_iw_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_iw_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 IB devices unless we + check node_type. */ + if (ret || cm_id->device->node_type != RDMA_NODE_RNIC) + 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_iw_exit(void) +{ + rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); + rds_iw_remove_nodev_conns(); + ib_unregister_client(&rds_iw_client); + rds_iw_sysctl_exit(); + rds_iw_recv_exit(); + rds_trans_unregister(&rds_iw_transport); +} + +struct rds_transport rds_iw_transport = { + .laddr_check = rds_iw_laddr_check, + .xmit_complete = rds_iw_xmit_complete, + .xmit = rds_iw_xmit, + .xmit_cong_map = NULL, + .xmit_rdma = rds_iw_xmit_rdma, + .recv = rds_iw_recv, + .conn_alloc = rds_iw_conn_alloc, + .conn_free = rds_iw_conn_free, + .conn_connect = rds_iw_conn_connect, + .conn_shutdown = rds_iw_conn_shutdown, + .inc_copy_to_user = rds_iw_inc_copy_to_user, + .inc_purge = rds_iw_inc_purge, + .inc_free = rds_iw_inc_free, + .cm_initiate_connect = rds_iw_cm_initiate_connect, + .cm_handle_connect = rds_iw_cm_handle_connect, + .cm_connect_complete = rds_iw_cm_connect_complete, + .stats_info_copy = rds_iw_stats_info_copy, + .exit = rds_iw_exit, + .get_mr = rds_iw_get_mr, + .sync_mr = rds_iw_sync_mr, + .free_mr = rds_iw_free_mr, + .flush_mrs = rds_iw_flush_mrs, + .t_owner = THIS_MODULE, + .t_name = "iwarp", + .t_prefer_loopback = 1, +}; + +int __init rds_iw_init(void) +{ + int ret; + + INIT_LIST_HEAD(&rds_iw_devices); + + ret = ib_register_client(&rds_iw_client); + if (ret) + goto out; + + ret = rds_iw_sysctl_init(); + if (ret) + goto out_ibreg; + + ret = rds_iw_recv_init(); + if (ret) + goto out_sysctl; + + ret = rds_trans_register(&rds_iw_transport); + if (ret) + goto out_recv; + + rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); + + goto out; + +out_recv: + rds_iw_recv_exit(); +out_sysctl: + rds_iw_sysctl_exit(); +out_ibreg: + ib_unregister_client(&rds_iw_client); +out: + return ret; +} + +MODULE_LICENSE("GPL"); + |
