1ec16227eSAndy Grover /*
29b17f588SKa-Cheong Poon * Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved.
3ec16227eSAndy Grover *
4ec16227eSAndy Grover * This software is available to you under a choice of one of two
5ec16227eSAndy Grover * licenses. You may choose to be licensed under the terms of the GNU
6ec16227eSAndy Grover * General Public License (GPL) Version 2, available from the file
7ec16227eSAndy Grover * COPYING in the main directory of this source tree, or the
8ec16227eSAndy Grover * OpenIB.org BSD license below:
9ec16227eSAndy Grover *
10ec16227eSAndy Grover * Redistribution and use in source and binary forms, with or
11ec16227eSAndy Grover * without modification, are permitted provided that the following
12ec16227eSAndy Grover * conditions are met:
13ec16227eSAndy Grover *
14ec16227eSAndy Grover * - Redistributions of source code must retain the above
15ec16227eSAndy Grover * copyright notice, this list of conditions and the following
16ec16227eSAndy Grover * disclaimer.
17ec16227eSAndy Grover *
18ec16227eSAndy Grover * - Redistributions in binary form must reproduce the above
19ec16227eSAndy Grover * copyright notice, this list of conditions and the following
20ec16227eSAndy Grover * disclaimer in the documentation and/or other materials
21ec16227eSAndy Grover * provided with the distribution.
22ec16227eSAndy Grover *
23ec16227eSAndy Grover * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24ec16227eSAndy Grover * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25ec16227eSAndy Grover * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26ec16227eSAndy Grover * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27ec16227eSAndy Grover * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28ec16227eSAndy Grover * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29ec16227eSAndy Grover * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30ec16227eSAndy Grover * SOFTWARE.
31ec16227eSAndy Grover *
32ec16227eSAndy Grover */
33ec16227eSAndy Grover #include <linux/kernel.h>
34ec16227eSAndy Grover #include <linux/in.h>
35ec16227eSAndy Grover #include <linux/if.h>
36ec16227eSAndy Grover #include <linux/netdevice.h>
37ec16227eSAndy Grover #include <linux/inetdevice.h>
38ec16227eSAndy Grover #include <linux/if_arp.h>
39ec16227eSAndy Grover #include <linux/delay.h>
405a0e3ad6STejun Heo #include <linux/slab.h>
413a9a231dSPaul Gortmaker #include <linux/module.h>
421e2b44e7SKa-Cheong Poon #include <net/addrconf.h>
43ec16227eSAndy Grover
440cb43965SSowmini Varadhan #include "rds_single_path.h"
45ec16227eSAndy Grover #include "rds.h"
46ec16227eSAndy Grover #include "ib.h"
47f6df683fSsantosh.shilimkar@oracle.com #include "ib_mr.h"
48ec16227eSAndy Grover
494f7bfb39SZhu Yanjun static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
504f7bfb39SZhu Yanjun static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
513ba23adeSAndy Grover unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
52ebeeb1adSSowmini Varadhan static atomic_t rds_ib_unloading;
53ec16227eSAndy Grover
54f6df683fSsantosh.shilimkar@oracle.com module_param(rds_ib_mr_1m_pool_size, int, 0444);
55f6df683fSsantosh.shilimkar@oracle.com MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
56f6df683fSsantosh.shilimkar@oracle.com module_param(rds_ib_mr_8k_pool_size, int, 0444);
57f6df683fSsantosh.shilimkar@oracle.com MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
583ba23adeSAndy Grover module_param(rds_ib_retry_count, int, 0444);
593ba23adeSAndy Grover MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
60ec16227eSAndy Grover
61ea819867SZach Brown /*
62ea819867SZach Brown * we have a clumsy combination of RCU and a rwsem protecting this list
63ea819867SZach Brown * because it is used both in the get_mr fast path and while blocking in
64ea819867SZach Brown * the FMR flushing path.
65ea819867SZach Brown */
66ea819867SZach Brown DECLARE_RWSEM(rds_ib_devices_lock);
67ec16227eSAndy Grover struct list_head rds_ib_devices;
68ec16227eSAndy Grover
69745cbccaSAndy Grover /* NOTE: if also grabbing ibdev lock, grab this first */
70ec16227eSAndy Grover DEFINE_SPINLOCK(ib_nodev_conns_lock);
71ec16227eSAndy Grover LIST_HEAD(ib_nodev_conns);
72ec16227eSAndy Grover
rds_ib_nodev_connect(void)73ff51bf84Sstephen hemminger static void rds_ib_nodev_connect(void)
74fc19de38SZach Brown {
75fc19de38SZach Brown struct rds_ib_connection *ic;
76fc19de38SZach Brown
77fc19de38SZach Brown spin_lock(&ib_nodev_conns_lock);
78fc19de38SZach Brown list_for_each_entry(ic, &ib_nodev_conns, ib_node)
79fc19de38SZach Brown rds_conn_connect_if_down(ic->conn);
80fc19de38SZach Brown spin_unlock(&ib_nodev_conns_lock);
81fc19de38SZach Brown }
82fc19de38SZach Brown
rds_ib_dev_shutdown(struct rds_ib_device * rds_ibdev)83ff51bf84Sstephen hemminger static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
84fc19de38SZach Brown {
85fc19de38SZach Brown struct rds_ib_connection *ic;
86fc19de38SZach Brown unsigned long flags;
87fc19de38SZach Brown
88fc19de38SZach Brown spin_lock_irqsave(&rds_ibdev->spinlock, flags);
89fc19de38SZach Brown list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
90b50e0587SZhu Yanjun rds_conn_path_drop(&ic->conn->c_path[0], true);
91fc19de38SZach Brown spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
92fc19de38SZach Brown }
93fc19de38SZach Brown
943e0249f9SZach Brown /*
953e0249f9SZach Brown * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
963e0249f9SZach Brown * from interrupt context so we push freing off into a work struct in krdsd.
973e0249f9SZach Brown */
rds_ib_dev_free(struct work_struct * work)983e0249f9SZach Brown static void rds_ib_dev_free(struct work_struct *work)
993e0249f9SZach Brown {
1003e0249f9SZach Brown struct rds_ib_ipaddr *i_ipaddr, *i_next;
1013e0249f9SZach Brown struct rds_ib_device *rds_ibdev = container_of(work,
1023e0249f9SZach Brown struct rds_ib_device, free_work);
1033e0249f9SZach Brown
10406766513SSantosh Shilimkar if (rds_ibdev->mr_8k_pool)
10506766513SSantosh Shilimkar rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool);
10606766513SSantosh Shilimkar if (rds_ibdev->mr_1m_pool)
10706766513SSantosh Shilimkar rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool);
1083e0249f9SZach Brown if (rds_ibdev->pd)
1093e0249f9SZach Brown ib_dealloc_pd(rds_ibdev->pd);
1103e0249f9SZach Brown
1113e0249f9SZach Brown list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
1123e0249f9SZach Brown list_del(&i_ipaddr->list);
1133e0249f9SZach Brown kfree(i_ipaddr);
1143e0249f9SZach Brown }
1153e0249f9SZach Brown
116be2f76eaSSantosh Shilimkar kfree(rds_ibdev->vector_load);
117be2f76eaSSantosh Shilimkar
1183e0249f9SZach Brown kfree(rds_ibdev);
1193e0249f9SZach Brown }
1203e0249f9SZach Brown
rds_ib_dev_put(struct rds_ib_device * rds_ibdev)1213e0249f9SZach Brown void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
1223e0249f9SZach Brown {
12350d61ff7SReshetova, Elena BUG_ON(refcount_read(&rds_ibdev->refcount) == 0);
12450d61ff7SReshetova, Elena if (refcount_dec_and_test(&rds_ibdev->refcount))
1253e0249f9SZach Brown queue_work(rds_wq, &rds_ibdev->free_work);
1263e0249f9SZach Brown }
1273e0249f9SZach Brown
rds_ib_add_one(struct ib_device * device)12811a0ae4cSJason Gunthorpe static int rds_ib_add_one(struct ib_device *device)
129ec16227eSAndy Grover {
130ec16227eSAndy Grover struct rds_ib_device *rds_ibdev;
13111a0ae4cSJason Gunthorpe int ret;
132ec16227eSAndy Grover
133ec16227eSAndy Grover /* Only handle IB (no iWARP) devices */
134ec16227eSAndy Grover if (device->node_type != RDMA_NODE_IB_CA)
13511a0ae4cSJason Gunthorpe return -EOPNOTSUPP;
136ec16227eSAndy Grover
13707549ee2SMax Gurtovoy /* Device must support FRWR */
13807549ee2SMax Gurtovoy if (!(device->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
13907549ee2SMax Gurtovoy return -EOPNOTSUPP;
14007549ee2SMax Gurtovoy
1413e0249f9SZach Brown rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
1423e0249f9SZach Brown ibdev_to_node(device));
143ec16227eSAndy Grover if (!rds_ibdev)
14411a0ae4cSJason Gunthorpe return -ENOMEM;
145ec16227eSAndy Grover
146ec16227eSAndy Grover spin_lock_init(&rds_ibdev->spinlock);
14750d61ff7SReshetova, Elena refcount_set(&rds_ibdev->refcount, 1);
1483e0249f9SZach Brown INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
149ec16227eSAndy Grover
150d64bf89aSDotan Barak INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
151d64bf89aSDotan Barak INIT_LIST_HEAD(&rds_ibdev->conn_list);
152d64bf89aSDotan Barak
1530353261cSOr Gerlitz rds_ibdev->max_wrs = device->attrs.max_qp_wr;
15433023fb8SSteve Wise rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE);
155ec16227eSAndy Grover
1562eafa174SHans Westgaard Ry rds_ibdev->odp_capable =
157*e945c653SJason Gunthorpe !!(device->attrs.kernel_cap_flags &
158*e945c653SJason Gunthorpe IBK_ON_DEMAND_PAGING) &&
1592eafa174SHans Westgaard Ry !!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
1602eafa174SHans Westgaard Ry IB_ODP_SUPPORT_WRITE) &&
1612eafa174SHans Westgaard Ry !!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
1622eafa174SHans Westgaard Ry IB_ODP_SUPPORT_READ);
1632cb2912dSsantosh.shilimkar@oracle.com
164f6df683fSsantosh.shilimkar@oracle.com rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
1650353261cSOr Gerlitz min_t(unsigned int, (device->attrs.max_mr / 2),
166f6df683fSsantosh.shilimkar@oracle.com rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
16706766513SSantosh Shilimkar
168f6df683fSsantosh.shilimkar@oracle.com rds_ibdev->max_8k_mrs = device->attrs.max_mr ?
1690353261cSOr Gerlitz min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
170f6df683fSsantosh.shilimkar@oracle.com rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size;
171ec16227eSAndy Grover
1720353261cSOr Gerlitz rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
1730353261cSOr Gerlitz rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
17440589e74SAndy Grover
1756396bb22SKees Cook rds_ibdev->vector_load = kcalloc(device->num_comp_vectors,
1766396bb22SKees Cook sizeof(int),
177be2f76eaSSantosh Shilimkar GFP_KERNEL);
178be2f76eaSSantosh Shilimkar if (!rds_ibdev->vector_load) {
179be2f76eaSSantosh Shilimkar pr_err("RDS/IB: %s failed to allocate vector memory\n",
180be2f76eaSSantosh Shilimkar __func__);
18111a0ae4cSJason Gunthorpe ret = -ENOMEM;
182be2f76eaSSantosh Shilimkar goto put_dev;
183be2f76eaSSantosh Shilimkar }
184be2f76eaSSantosh Shilimkar
185ec16227eSAndy Grover rds_ibdev->dev = device;
186ed082d36SChristoph Hellwig rds_ibdev->pd = ib_alloc_pd(device, 0);
1873e0249f9SZach Brown if (IS_ERR(rds_ibdev->pd)) {
18811a0ae4cSJason Gunthorpe ret = PTR_ERR(rds_ibdev->pd);
1893e0249f9SZach Brown rds_ibdev->pd = NULL;
1903e0249f9SZach Brown goto put_dev;
1913e0249f9SZach Brown }
192ec16227eSAndy Grover
19306766513SSantosh Shilimkar rds_ibdev->mr_1m_pool =
19406766513SSantosh Shilimkar rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
19506766513SSantosh Shilimkar if (IS_ERR(rds_ibdev->mr_1m_pool)) {
19611a0ae4cSJason Gunthorpe ret = PTR_ERR(rds_ibdev->mr_1m_pool);
19706766513SSantosh Shilimkar rds_ibdev->mr_1m_pool = NULL;
1983e0249f9SZach Brown goto put_dev;
199ec16227eSAndy Grover }
200ec16227eSAndy Grover
20106766513SSantosh Shilimkar rds_ibdev->mr_8k_pool =
20206766513SSantosh Shilimkar rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
20306766513SSantosh Shilimkar if (IS_ERR(rds_ibdev->mr_8k_pool)) {
20411a0ae4cSJason Gunthorpe ret = PTR_ERR(rds_ibdev->mr_8k_pool);
20506766513SSantosh Shilimkar rds_ibdev->mr_8k_pool = NULL;
20606766513SSantosh Shilimkar goto put_dev;
20706766513SSantosh Shilimkar }
20806766513SSantosh Shilimkar
20907549ee2SMax Gurtovoy rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, max_1m_mrs = %d, max_8k_mrs = %d\n",
210649392bfSJason Gunthorpe device->attrs.max_mr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
21107549ee2SMax Gurtovoy rds_ibdev->max_1m_mrs, rds_ibdev->max_8k_mrs);
21206766513SSantosh Shilimkar
21307549ee2SMax Gurtovoy pr_info("RDS/IB: %s: added\n", device->name);
2142cb2912dSsantosh.shilimkar@oracle.com
215ea819867SZach Brown down_write(&rds_ib_devices_lock);
216ea819867SZach Brown list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
217ea819867SZach Brown up_write(&rds_ib_devices_lock);
21850d61ff7SReshetova, Elena refcount_inc(&rds_ibdev->refcount);
219ec16227eSAndy Grover
220ec16227eSAndy Grover ib_set_client_data(device, &rds_ib_client, rds_ibdev);
221ec16227eSAndy Grover
222fc19de38SZach Brown rds_ib_nodev_connect();
22311a0ae4cSJason Gunthorpe return 0;
224fc19de38SZach Brown
2253e0249f9SZach Brown put_dev:
2263e0249f9SZach Brown rds_ib_dev_put(rds_ibdev);
22711a0ae4cSJason Gunthorpe return ret;
228ec16227eSAndy Grover }
229ec16227eSAndy Grover
2303e0249f9SZach Brown /*
2313e0249f9SZach Brown * New connections use this to find the device to associate with the
2323e0249f9SZach Brown * connection. It's not in the fast path so we're not concerned about the
2333e0249f9SZach Brown * performance of the IB call. (As of this writing, it uses an interrupt
2343e0249f9SZach Brown * blocking spinlock to serialize walking a per-device list of all registered
2353e0249f9SZach Brown * clients.)
2363e0249f9SZach Brown *
2373e0249f9SZach Brown * RCU is used to handle incoming connections racing with device teardown.
2383e0249f9SZach Brown * Rather than use a lock to serialize removal from the client_data and
2393e0249f9SZach Brown * getting a new reference, we use an RCU grace period. The destruction
2403e0249f9SZach Brown * path removes the device from client_data and then waits for all RCU
2413e0249f9SZach Brown * readers to finish.
2423e0249f9SZach Brown *
2433e0249f9SZach Brown * A new connection can get NULL from this if its arriving on a
2443e0249f9SZach Brown * device that is in the process of being removed.
2453e0249f9SZach Brown */
rds_ib_get_client_data(struct ib_device * device)2463e0249f9SZach Brown struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
2473e0249f9SZach Brown {
2483e0249f9SZach Brown struct rds_ib_device *rds_ibdev;
2493e0249f9SZach Brown
2503e0249f9SZach Brown rcu_read_lock();
2513e0249f9SZach Brown rds_ibdev = ib_get_client_data(device, &rds_ib_client);
2523e0249f9SZach Brown if (rds_ibdev)
25350d61ff7SReshetova, Elena refcount_inc(&rds_ibdev->refcount);
2543e0249f9SZach Brown rcu_read_unlock();
2553e0249f9SZach Brown return rds_ibdev;
2563e0249f9SZach Brown }
2573e0249f9SZach Brown
2583e0249f9SZach Brown /*
2593e0249f9SZach Brown * The IB stack is letting us know that a device is going away. This can
2603e0249f9SZach Brown * happen if the underlying HCA driver is removed or if PCI hotplug is removing
2613e0249f9SZach Brown * the pci function, for example.
2623e0249f9SZach Brown *
2633e0249f9SZach Brown * This can be called at any time and can be racing with any other RDS path.
2643e0249f9SZach Brown */
rds_ib_remove_one(struct ib_device * device,void * client_data)2657c1eb45aSHaggai Eran static void rds_ib_remove_one(struct ib_device *device, void *client_data)
266ec16227eSAndy Grover {
2677c1eb45aSHaggai Eran struct rds_ib_device *rds_ibdev = client_data;
268ec16227eSAndy Grover
269fc19de38SZach Brown rds_ib_dev_shutdown(rds_ibdev);
270ec16227eSAndy Grover
271ea819867SZach Brown /* stop connection attempts from getting a reference to this device. */
2723e0249f9SZach Brown ib_set_client_data(device, &rds_ib_client, NULL);
273ea819867SZach Brown
274ea819867SZach Brown down_write(&rds_ib_devices_lock);
275ea819867SZach Brown list_del_rcu(&rds_ibdev->list);
276ea819867SZach Brown up_write(&rds_ib_devices_lock);
277ea819867SZach Brown
278ea819867SZach Brown /*
279ea819867SZach Brown * This synchronize rcu is waiting for readers of both the ib
280ea819867SZach Brown * client data and the devices list to finish before we drop
281ea819867SZach Brown * both of those references.
282ea819867SZach Brown */
2833e0249f9SZach Brown synchronize_rcu();
2843e0249f9SZach Brown rds_ib_dev_put(rds_ibdev);
2853e0249f9SZach Brown rds_ib_dev_put(rds_ibdev);
286ec16227eSAndy Grover }
287ec16227eSAndy Grover
288ec16227eSAndy Grover struct ib_client rds_ib_client = {
289ec16227eSAndy Grover .name = "rds_ib",
290ec16227eSAndy Grover .add = rds_ib_add_one,
291ec16227eSAndy Grover .remove = rds_ib_remove_one
292ec16227eSAndy Grover };
293ec16227eSAndy Grover
rds_ib_conn_info_visitor(struct rds_connection * conn,void * buffer)294ec16227eSAndy Grover static int rds_ib_conn_info_visitor(struct rds_connection *conn,
295ec16227eSAndy Grover void *buffer)
296ec16227eSAndy Grover {
297ec16227eSAndy Grover struct rds_info_rdma_connection *iinfo = buffer;
298e0e6d062SZhu Yanjun struct rds_ib_connection *ic = conn->c_transport_data;
299ec16227eSAndy Grover
300ec16227eSAndy Grover /* We will only ever look at IB transports */
301ec16227eSAndy Grover if (conn->c_trans != &rds_ib_transport)
302ec16227eSAndy Grover return 0;
3031e2b44e7SKa-Cheong Poon if (conn->c_isv6)
3041e2b44e7SKa-Cheong Poon return 0;
305ec16227eSAndy Grover
306eee2fa6aSKa-Cheong Poon iinfo->src_addr = conn->c_laddr.s6_addr32[3];
307eee2fa6aSKa-Cheong Poon iinfo->dst_addr = conn->c_faddr.s6_addr32[3];
308e0e6d062SZhu Yanjun if (ic) {
3093eb45036SSantosh Shilimkar iinfo->tos = conn->c_tos;
310e0e6d062SZhu Yanjun iinfo->sl = ic->i_sl;
311e0e6d062SZhu Yanjun }
312ec16227eSAndy Grover
313ec16227eSAndy Grover memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
314ec16227eSAndy Grover memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
315ec16227eSAndy Grover if (rds_conn_state(conn) == RDS_CONN_UP) {
316ec16227eSAndy Grover struct rds_ib_device *rds_ibdev;
317ec16227eSAndy Grover
318a2e812eaSParav Pandit rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid,
319a2e812eaSParav Pandit (union ib_gid *)&iinfo->dst_gid);
320ec16227eSAndy Grover
3213e0249f9SZach Brown rds_ibdev = ic->rds_ibdev;
322ec16227eSAndy Grover iinfo->max_send_wr = ic->i_send_ring.w_nr;
323ec16227eSAndy Grover iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
324ec16227eSAndy Grover iinfo->max_send_sge = rds_ibdev->max_sge;
325ec16227eSAndy Grover rds_ib_get_mr_info(rds_ibdev, iinfo);
326fe3475afSZhu Yanjun iinfo->cache_allocs = atomic_read(&ic->i_cache_allocs);
327ec16227eSAndy Grover }
328ec16227eSAndy Grover return 1;
329ec16227eSAndy Grover }
330ec16227eSAndy Grover
331e65d4d96SKa-Cheong Poon #if IS_ENABLED(CONFIG_IPV6)
332b7ff8b10SKa-Cheong Poon /* IPv6 version of rds_ib_conn_info_visitor(). */
rds6_ib_conn_info_visitor(struct rds_connection * conn,void * buffer)333b7ff8b10SKa-Cheong Poon static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
334b7ff8b10SKa-Cheong Poon void *buffer)
335b7ff8b10SKa-Cheong Poon {
336b7ff8b10SKa-Cheong Poon struct rds6_info_rdma_connection *iinfo6 = buffer;
337e0e6d062SZhu Yanjun struct rds_ib_connection *ic = conn->c_transport_data;
338b7ff8b10SKa-Cheong Poon
339b7ff8b10SKa-Cheong Poon /* We will only ever look at IB transports */
340b7ff8b10SKa-Cheong Poon if (conn->c_trans != &rds_ib_transport)
341b7ff8b10SKa-Cheong Poon return 0;
342b7ff8b10SKa-Cheong Poon
343b7ff8b10SKa-Cheong Poon iinfo6->src_addr = conn->c_laddr;
344b7ff8b10SKa-Cheong Poon iinfo6->dst_addr = conn->c_faddr;
345e0e6d062SZhu Yanjun if (ic) {
346e0e6d062SZhu Yanjun iinfo6->tos = conn->c_tos;
347e0e6d062SZhu Yanjun iinfo6->sl = ic->i_sl;
348e0e6d062SZhu Yanjun }
349b7ff8b10SKa-Cheong Poon
350b7ff8b10SKa-Cheong Poon memset(&iinfo6->src_gid, 0, sizeof(iinfo6->src_gid));
351b7ff8b10SKa-Cheong Poon memset(&iinfo6->dst_gid, 0, sizeof(iinfo6->dst_gid));
352b7ff8b10SKa-Cheong Poon
353b7ff8b10SKa-Cheong Poon if (rds_conn_state(conn) == RDS_CONN_UP) {
354b7ff8b10SKa-Cheong Poon struct rds_ib_device *rds_ibdev;
355b7ff8b10SKa-Cheong Poon
35653ae914dSZhu Yanjun rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid,
357b7ff8b10SKa-Cheong Poon (union ib_gid *)&iinfo6->dst_gid);
358b7ff8b10SKa-Cheong Poon rds_ibdev = ic->rds_ibdev;
359b7ff8b10SKa-Cheong Poon iinfo6->max_send_wr = ic->i_send_ring.w_nr;
360b7ff8b10SKa-Cheong Poon iinfo6->max_recv_wr = ic->i_recv_ring.w_nr;
361b7ff8b10SKa-Cheong Poon iinfo6->max_send_sge = rds_ibdev->max_sge;
362b7ff8b10SKa-Cheong Poon rds6_ib_get_mr_info(rds_ibdev, iinfo6);
363fe3475afSZhu Yanjun iinfo6->cache_allocs = atomic_read(&ic->i_cache_allocs);
364b7ff8b10SKa-Cheong Poon }
365b7ff8b10SKa-Cheong Poon return 1;
366b7ff8b10SKa-Cheong Poon }
367e65d4d96SKa-Cheong Poon #endif
368b7ff8b10SKa-Cheong Poon
rds_ib_ic_info(struct socket * sock,unsigned int len,struct rds_info_iterator * iter,struct rds_info_lengths * lens)369ec16227eSAndy Grover static void rds_ib_ic_info(struct socket *sock, unsigned int len,
370ec16227eSAndy Grover struct rds_info_iterator *iter,
371ec16227eSAndy Grover struct rds_info_lengths *lens)
372ec16227eSAndy Grover {
373f1cb9d68SSalvatore Mesoraca u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8];
374f1cb9d68SSalvatore Mesoraca
375ec16227eSAndy Grover rds_for_each_conn_info(sock, len, iter, lens,
376ec16227eSAndy Grover rds_ib_conn_info_visitor,
377f1cb9d68SSalvatore Mesoraca buffer,
378ec16227eSAndy Grover sizeof(struct rds_info_rdma_connection));
379ec16227eSAndy Grover }
380ec16227eSAndy Grover
381e65d4d96SKa-Cheong Poon #if IS_ENABLED(CONFIG_IPV6)
382b7ff8b10SKa-Cheong Poon /* IPv6 version of rds_ib_ic_info(). */
rds6_ib_ic_info(struct socket * sock,unsigned int len,struct rds_info_iterator * iter,struct rds_info_lengths * lens)383b7ff8b10SKa-Cheong Poon static void rds6_ib_ic_info(struct socket *sock, unsigned int len,
384b7ff8b10SKa-Cheong Poon struct rds_info_iterator *iter,
385b7ff8b10SKa-Cheong Poon struct rds_info_lengths *lens)
386b7ff8b10SKa-Cheong Poon {
387b7ff8b10SKa-Cheong Poon u64 buffer[(sizeof(struct rds6_info_rdma_connection) + 7) / 8];
388b7ff8b10SKa-Cheong Poon
389b7ff8b10SKa-Cheong Poon rds_for_each_conn_info(sock, len, iter, lens,
390b7ff8b10SKa-Cheong Poon rds6_ib_conn_info_visitor,
391b7ff8b10SKa-Cheong Poon buffer,
392b7ff8b10SKa-Cheong Poon sizeof(struct rds6_info_rdma_connection));
393b7ff8b10SKa-Cheong Poon }
394e65d4d96SKa-Cheong Poon #endif
395ec16227eSAndy Grover
396ec16227eSAndy Grover /*
397ec16227eSAndy Grover * Early RDS/IB was built to only bind to an address if there is an IPoIB
398ec16227eSAndy Grover * device with that address set.
399ec16227eSAndy Grover *
400ec16227eSAndy Grover * If it were me, I'd advocate for something more flexible. Sending and
401ec16227eSAndy Grover * receiving should be device-agnostic. Transports would try and maintain
402ec16227eSAndy Grover * connections between peers who have messages queued. Userspace would be
403ec16227eSAndy Grover * allowed to influence which paths have priority. We could call userspace
404ec16227eSAndy Grover * asserting this policy "routing".
405ec16227eSAndy Grover */
rds_ib_laddr_check(struct net * net,const struct in6_addr * addr,__u32 scope_id)406eee2fa6aSKa-Cheong Poon static int rds_ib_laddr_check(struct net *net, const struct in6_addr *addr,
407eee2fa6aSKa-Cheong Poon __u32 scope_id)
408ec16227eSAndy Grover {
409ec16227eSAndy Grover int ret;
410ec16227eSAndy Grover struct rdma_cm_id *cm_id;
411e65d4d96SKa-Cheong Poon #if IS_ENABLED(CONFIG_IPV6)
4121e2b44e7SKa-Cheong Poon struct sockaddr_in6 sin6;
413e65d4d96SKa-Cheong Poon #endif
414ec16227eSAndy Grover struct sockaddr_in sin;
4151e2b44e7SKa-Cheong Poon struct sockaddr *sa;
4161e2b44e7SKa-Cheong Poon bool isv4;
417ec16227eSAndy Grover
4181e2b44e7SKa-Cheong Poon isv4 = ipv6_addr_v4mapped(addr);
419ec16227eSAndy Grover /* Create a CMA ID and try to bind it. This catches both
420ec16227eSAndy Grover * IB and iWARP capable NICs.
421ec16227eSAndy Grover */
4222c0aa086SGuanglei Li cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler,
4232c0aa086SGuanglei Li NULL, RDMA_PS_TCP, IB_QPT_RC);
42494713babSDan Carpenter if (IS_ERR(cm_id))
42594713babSDan Carpenter return PTR_ERR(cm_id);
426ec16227eSAndy Grover
4271e2b44e7SKa-Cheong Poon if (isv4) {
428ec16227eSAndy Grover memset(&sin, 0, sizeof(sin));
429ec16227eSAndy Grover sin.sin_family = AF_INET;
430eee2fa6aSKa-Cheong Poon sin.sin_addr.s_addr = addr->s6_addr32[3];
4311e2b44e7SKa-Cheong Poon sa = (struct sockaddr *)&sin;
4321e2b44e7SKa-Cheong Poon } else {
433e65d4d96SKa-Cheong Poon #if IS_ENABLED(CONFIG_IPV6)
4341e2b44e7SKa-Cheong Poon memset(&sin6, 0, sizeof(sin6));
4351e2b44e7SKa-Cheong Poon sin6.sin6_family = AF_INET6;
4361e2b44e7SKa-Cheong Poon sin6.sin6_addr = *addr;
4371e2b44e7SKa-Cheong Poon sin6.sin6_scope_id = scope_id;
4381e2b44e7SKa-Cheong Poon sa = (struct sockaddr *)&sin6;
4391e2b44e7SKa-Cheong Poon
4401e2b44e7SKa-Cheong Poon /* XXX Do a special IPv6 link local address check here. The
4411e2b44e7SKa-Cheong Poon * reason is that rdma_bind_addr() always succeeds with IPv6
4421e2b44e7SKa-Cheong Poon * link local address regardless it is indeed configured in a
4431e2b44e7SKa-Cheong Poon * system.
4441e2b44e7SKa-Cheong Poon */
4451e2b44e7SKa-Cheong Poon if (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL) {
4461e2b44e7SKa-Cheong Poon struct net_device *dev;
4471e2b44e7SKa-Cheong Poon
448e65d4d96SKa-Cheong Poon if (scope_id == 0) {
449e65d4d96SKa-Cheong Poon ret = -EADDRNOTAVAIL;
450e65d4d96SKa-Cheong Poon goto out;
451e65d4d96SKa-Cheong Poon }
4521e2b44e7SKa-Cheong Poon
4531e2b44e7SKa-Cheong Poon /* Use init_net for now as RDS is not network
4541e2b44e7SKa-Cheong Poon * name space aware.
4551e2b44e7SKa-Cheong Poon */
4561e2b44e7SKa-Cheong Poon dev = dev_get_by_index(&init_net, scope_id);
457e65d4d96SKa-Cheong Poon if (!dev) {
458e65d4d96SKa-Cheong Poon ret = -EADDRNOTAVAIL;
459e65d4d96SKa-Cheong Poon goto out;
460e65d4d96SKa-Cheong Poon }
4611e2b44e7SKa-Cheong Poon if (!ipv6_chk_addr(&init_net, addr, dev, 1)) {
4621e2b44e7SKa-Cheong Poon dev_put(dev);
463e65d4d96SKa-Cheong Poon ret = -EADDRNOTAVAIL;
464e65d4d96SKa-Cheong Poon goto out;
4651e2b44e7SKa-Cheong Poon }
4661e2b44e7SKa-Cheong Poon dev_put(dev);
4671e2b44e7SKa-Cheong Poon }
468e65d4d96SKa-Cheong Poon #else
469e65d4d96SKa-Cheong Poon ret = -EADDRNOTAVAIL;
470e65d4d96SKa-Cheong Poon goto out;
471e65d4d96SKa-Cheong Poon #endif
4721e2b44e7SKa-Cheong Poon }
473ec16227eSAndy Grover
474ec16227eSAndy Grover /* rdma_bind_addr will only succeed for IB & iWARP devices */
4751e2b44e7SKa-Cheong Poon ret = rdma_bind_addr(cm_id, sa);
476ec16227eSAndy Grover /* due to this, we will claim to support iWARP devices unless we
477ec16227eSAndy Grover check node_type. */
478c2349758SSasha Levin if (ret || !cm_id->device ||
479c2349758SSasha Levin cm_id->device->node_type != RDMA_NODE_IB_CA)
480ec16227eSAndy Grover ret = -EADDRNOTAVAIL;
481ec16227eSAndy Grover
4821e2b44e7SKa-Cheong Poon rdsdebug("addr %pI6c%%%u ret %d node type %d\n",
4831e2b44e7SKa-Cheong Poon addr, scope_id, ret,
484ec16227eSAndy Grover cm_id->device ? cm_id->device->node_type : -1);
485ec16227eSAndy Grover
486e65d4d96SKa-Cheong Poon out:
487ec16227eSAndy Grover rdma_destroy_id(cm_id);
488ec16227eSAndy Grover
489ec16227eSAndy Grover return ret;
490ec16227eSAndy Grover }
491ec16227eSAndy Grover
rds_ib_unregister_client(void)49224fa163aSZach Brown static void rds_ib_unregister_client(void)
49324fa163aSZach Brown {
49424fa163aSZach Brown ib_unregister_client(&rds_ib_client);
49524fa163aSZach Brown /* wait for rds_ib_dev_free() to complete */
49624fa163aSZach Brown flush_workqueue(rds_wq);
49724fa163aSZach Brown }
49824fa163aSZach Brown
rds_ib_set_unloading(void)499ebeeb1adSSowmini Varadhan static void rds_ib_set_unloading(void)
500ebeeb1adSSowmini Varadhan {
501ebeeb1adSSowmini Varadhan atomic_set(&rds_ib_unloading, 1);
502ebeeb1adSSowmini Varadhan }
503ebeeb1adSSowmini Varadhan
rds_ib_is_unloading(struct rds_connection * conn)504ebeeb1adSSowmini Varadhan static bool rds_ib_is_unloading(struct rds_connection *conn)
505ebeeb1adSSowmini Varadhan {
506ebeeb1adSSowmini Varadhan struct rds_conn_path *cp = &conn->c_path[0];
507ebeeb1adSSowmini Varadhan
508ebeeb1adSSowmini Varadhan return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) ||
509ebeeb1adSSowmini Varadhan atomic_read(&rds_ib_unloading) != 0);
510ebeeb1adSSowmini Varadhan }
511ebeeb1adSSowmini Varadhan
rds_ib_exit(void)512ec16227eSAndy Grover void rds_ib_exit(void)
513ec16227eSAndy Grover {
514ebeeb1adSSowmini Varadhan rds_ib_set_unloading();
515ebeeb1adSSowmini Varadhan synchronize_rcu();
516ec16227eSAndy Grover rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
517e65d4d96SKa-Cheong Poon #if IS_ENABLED(CONFIG_IPV6)
518b7ff8b10SKa-Cheong Poon rds_info_deregister_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
519e65d4d96SKa-Cheong Poon #endif
52024fa163aSZach Brown rds_ib_unregister_client();
5218aeb1ba6SZach Brown rds_ib_destroy_nodev_conns();
522ec16227eSAndy Grover rds_ib_sysctl_exit();
523ec16227eSAndy Grover rds_ib_recv_exit();
524ec16227eSAndy Grover rds_trans_unregister(&rds_ib_transport);
525f6df683fSsantosh.shilimkar@oracle.com rds_ib_mr_exit();
526ec16227eSAndy Grover }
527ec16227eSAndy Grover
rds_ib_get_tos_map(u8 tos)52856dc8bceSSantosh Shilimkar static u8 rds_ib_get_tos_map(u8 tos)
52956dc8bceSSantosh Shilimkar {
53056dc8bceSSantosh Shilimkar /* 1:1 user to transport map for RDMA transport.
53156dc8bceSSantosh Shilimkar * In future, if custom map is desired, hook can export
53256dc8bceSSantosh Shilimkar * user configurable map.
53356dc8bceSSantosh Shilimkar */
53456dc8bceSSantosh Shilimkar return tos;
53556dc8bceSSantosh Shilimkar }
53656dc8bceSSantosh Shilimkar
537ec16227eSAndy Grover struct rds_transport rds_ib_transport = {
538ec16227eSAndy Grover .laddr_check = rds_ib_laddr_check,
539226f7a7dSSowmini Varadhan .xmit_path_complete = rds_ib_xmit_path_complete,
540ec16227eSAndy Grover .xmit = rds_ib_xmit,
541ec16227eSAndy Grover .xmit_rdma = rds_ib_xmit_rdma,
54215133f6eSAndy Grover .xmit_atomic = rds_ib_xmit_atomic,
5432da43c4aSSowmini Varadhan .recv_path = rds_ib_recv_path,
544ec16227eSAndy Grover .conn_alloc = rds_ib_conn_alloc,
545ec16227eSAndy Grover .conn_free = rds_ib_conn_free,
546b04e8554SSowmini Varadhan .conn_path_connect = rds_ib_conn_path_connect,
547226f7a7dSSowmini Varadhan .conn_path_shutdown = rds_ib_conn_path_shutdown,
548ec16227eSAndy Grover .inc_copy_to_user = rds_ib_inc_copy_to_user,
549ec16227eSAndy Grover .inc_free = rds_ib_inc_free,
550ec16227eSAndy Grover .cm_initiate_connect = rds_ib_cm_initiate_connect,
551ec16227eSAndy Grover .cm_handle_connect = rds_ib_cm_handle_connect,
552ec16227eSAndy Grover .cm_connect_complete = rds_ib_cm_connect_complete,
553ec16227eSAndy Grover .stats_info_copy = rds_ib_stats_info_copy,
554ec16227eSAndy Grover .exit = rds_ib_exit,
555ec16227eSAndy Grover .get_mr = rds_ib_get_mr,
556ec16227eSAndy Grover .sync_mr = rds_ib_sync_mr,
557ec16227eSAndy Grover .free_mr = rds_ib_free_mr,
558ec16227eSAndy Grover .flush_mrs = rds_ib_flush_mrs,
55956dc8bceSSantosh Shilimkar .get_tos_map = rds_ib_get_tos_map,
560ec16227eSAndy Grover .t_owner = THIS_MODULE,
561ec16227eSAndy Grover .t_name = "infiniband",
562ebeeb1adSSowmini Varadhan .t_unloading = rds_ib_is_unloading,
563335776bdSAndy Grover .t_type = RDS_TRANS_IB
564ec16227eSAndy Grover };
565ec16227eSAndy Grover
rds_ib_init(void)566ef87b7eaSZach Brown int rds_ib_init(void)
567ec16227eSAndy Grover {
568ec16227eSAndy Grover int ret;
569ec16227eSAndy Grover
570ec16227eSAndy Grover INIT_LIST_HEAD(&rds_ib_devices);
571ec16227eSAndy Grover
572f6df683fSsantosh.shilimkar@oracle.com ret = rds_ib_mr_init();
573515e079dSZach Brown if (ret)
574c534a107STejun Heo goto out;
575515e079dSZach Brown
576ad1d7dc0Ssantosh.shilimkar@oracle.com ret = ib_register_client(&rds_ib_client);
577ad1d7dc0Ssantosh.shilimkar@oracle.com if (ret)
578f6df683fSsantosh.shilimkar@oracle.com goto out_mr_exit;
579ad1d7dc0Ssantosh.shilimkar@oracle.com
580ec16227eSAndy Grover ret = rds_ib_sysctl_init();
581ec16227eSAndy Grover if (ret)
582ec16227eSAndy Grover goto out_ibreg;
583ec16227eSAndy Grover
584ec16227eSAndy Grover ret = rds_ib_recv_init();
585ec16227eSAndy Grover if (ret)
586ec16227eSAndy Grover goto out_sysctl;
587ec16227eSAndy Grover
588a8d63a53SZhu Yanjun rds_trans_register(&rds_ib_transport);
589ec16227eSAndy Grover
590ec16227eSAndy Grover rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
591e65d4d96SKa-Cheong Poon #if IS_ENABLED(CONFIG_IPV6)
592b7ff8b10SKa-Cheong Poon rds_info_register_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
593e65d4d96SKa-Cheong Poon #endif
594ec16227eSAndy Grover
595ec16227eSAndy Grover goto out;
596ec16227eSAndy Grover
597ec16227eSAndy Grover out_sysctl:
598ec16227eSAndy Grover rds_ib_sysctl_exit();
599ec16227eSAndy Grover out_ibreg:
60024fa163aSZach Brown rds_ib_unregister_client();
601f6df683fSsantosh.shilimkar@oracle.com out_mr_exit:
602f6df683fSsantosh.shilimkar@oracle.com rds_ib_mr_exit();
603ec16227eSAndy Grover out:
604ec16227eSAndy Grover return ret;
605ec16227eSAndy Grover }
606ec16227eSAndy Grover
607ec16227eSAndy Grover MODULE_LICENSE("GPL");
608