rxe.c

  1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
  2/*
  3 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
  4 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
  5 */
  6
  7#include <rdma/rdma_netlink.h>
  8#include <net/addrconf.h>
  9#include "rxe.h"
 10#include "rxe_loc.h"
 11
 12MODULE_AUTHOR("Bob Pearson, Frank Zago, John Groves, Kamal Heib");
 13MODULE_DESCRIPTION("Soft RDMA transport");
 14MODULE_LICENSE("Dual BSD/GPL");
 15
 16/* free resources for a rxe device all objects created for this device must
 17 * have been destroyed
 18 */
 19void rxe_dealloc(struct ib_device *ib_dev)
 20{
 21	struct rxe_dev *rxe = container_of(ib_dev, struct rxe_dev, ib_dev);
 22
 23	rxe_pool_cleanup(&rxe->uc_pool);
 24	rxe_pool_cleanup(&rxe->pd_pool);
 25	rxe_pool_cleanup(&rxe->ah_pool);
 26	rxe_pool_cleanup(&rxe->srq_pool);
 27	rxe_pool_cleanup(&rxe->qp_pool);
 28	rxe_pool_cleanup(&rxe->cq_pool);
 29	rxe_pool_cleanup(&rxe->mr_pool);
 30	rxe_pool_cleanup(&rxe->mw_pool);
 31
 32	WARN_ON(!RB_EMPTY_ROOT(&rxe->mcg_tree));
 33
 34	mutex_destroy(&rxe->usdev_lock);
 35}
 36
 37static const struct ib_device_ops rxe_ib_dev_odp_ops = {
 38	.advise_mr = rxe_ib_advise_mr,
 39};
 40
 41/* initialize rxe device parameters */
 42static void rxe_init_device_param(struct rxe_dev *rxe, struct net_device *ndev)
 43{
 44	rxe->max_inline_data			= RXE_MAX_INLINE_DATA;
 45
 46	rxe->attr.vendor_id			= RXE_VENDOR_ID;
 47	rxe->attr.max_mr_size			= RXE_MAX_MR_SIZE;
 48	rxe->attr.page_size_cap			= RXE_PAGE_SIZE_CAP;
 49	rxe->attr.max_qp			= RXE_MAX_QP;
 50	rxe->attr.max_qp_wr			= RXE_MAX_QP_WR;
 51	rxe->attr.device_cap_flags		= RXE_DEVICE_CAP_FLAGS;
 52	rxe->attr.kernel_cap_flags		= IBK_ALLOW_USER_UNREG;
 53	rxe->attr.max_send_sge			= RXE_MAX_SGE;
 54	rxe->attr.max_recv_sge			= RXE_MAX_SGE;
 55	rxe->attr.max_sge_rd			= RXE_MAX_SGE_RD;
 56	rxe->attr.max_cq			= RXE_MAX_CQ;
 57	rxe->attr.max_cqe			= (1 << RXE_MAX_LOG_CQE) - 1;
 58	rxe->attr.max_mr			= RXE_MAX_MR;
 59	rxe->attr.max_mw			= RXE_MAX_MW;
 60	rxe->attr.max_pd			= RXE_MAX_PD;
 61	rxe->attr.max_qp_rd_atom		= RXE_MAX_QP_RD_ATOM;
 62	rxe->attr.max_res_rd_atom		= RXE_MAX_RES_RD_ATOM;
 63	rxe->attr.max_qp_init_rd_atom		= RXE_MAX_QP_INIT_RD_ATOM;
 64	rxe->attr.atomic_cap			= IB_ATOMIC_HCA;
 65	rxe->attr.max_mcast_grp			= RXE_MAX_MCAST_GRP;
 66	rxe->attr.max_mcast_qp_attach		= RXE_MAX_MCAST_QP_ATTACH;
 67	rxe->attr.max_total_mcast_qp_attach	= RXE_MAX_TOT_MCAST_QP_ATTACH;
 68	rxe->attr.max_ah			= RXE_MAX_AH;
 69	rxe->attr.max_srq			= RXE_MAX_SRQ;
 70	rxe->attr.max_srq_wr			= RXE_MAX_SRQ_WR;
 71	rxe->attr.max_srq_sge			= RXE_MAX_SRQ_SGE;
 72	rxe->attr.max_fast_reg_page_list_len	= RXE_MAX_FMR_PAGE_LIST_LEN;
 73	rxe->attr.max_pkeys			= RXE_MAX_PKEYS;
 74	rxe->attr.local_ca_ack_delay		= RXE_LOCAL_CA_ACK_DELAY;
 75
 76	if (ndev->addr_len) {
 77		memcpy(rxe->raw_gid, ndev->dev_addr,
 78			min_t(unsigned int, ndev->addr_len, ETH_ALEN));
 79	} else {
 80		/*
 81		 * This device does not have a HW address, but
 82		 * connection mangagement requires a unique gid.
 83		 */
 84		eth_random_addr(rxe->raw_gid);
 85	}
 86
 87	addrconf_addr_eui48((unsigned char *)&rxe->attr.sys_image_guid,
 88			rxe->raw_gid);
 89
 90	rxe->max_ucontext			= RXE_MAX_UCONTEXT;
 91
 92	if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING)) {
 93		rxe->attr.kernel_cap_flags |= IBK_ON_DEMAND_PAGING;
 94
 95		/* IB_ODP_SUPPORT_IMPLICIT is not supported right now. */
 96		rxe->attr.odp_caps.general_caps |= IB_ODP_SUPPORT;
 97
 98		rxe->attr.odp_caps.per_transport_caps.ud_odp_caps |= IB_ODP_SUPPORT_SEND;
 99		rxe->attr.odp_caps.per_transport_caps.ud_odp_caps |= IB_ODP_SUPPORT_RECV;
100		rxe->attr.odp_caps.per_transport_caps.ud_odp_caps |= IB_ODP_SUPPORT_SRQ_RECV;
101
102		rxe->attr.odp_caps.per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_SEND;
103		rxe->attr.odp_caps.per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_RECV;
104		rxe->attr.odp_caps.per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_WRITE;
105		rxe->attr.odp_caps.per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_READ;
106		rxe->attr.odp_caps.per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_ATOMIC;
107		rxe->attr.odp_caps.per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_SRQ_RECV;
108		rxe->attr.odp_caps.per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_FLUSH;
109		rxe->attr.odp_caps.per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_ATOMIC_WRITE;
110
111		/* set handler for ODP prefetching API - ibv_advise_mr(3) */
112		ib_set_device_ops(&rxe->ib_dev, &rxe_ib_dev_odp_ops);
113	}
114}
115
116/* initialize port attributes */
117static void rxe_init_port_param(struct rxe_port *port)
118{
119	port->attr.state		= IB_PORT_DOWN;
120	port->attr.max_mtu		= IB_MTU_4096;
121	port->attr.active_mtu		= IB_MTU_256;
122	port->attr.gid_tbl_len		= RXE_PORT_GID_TBL_LEN;
123	port->attr.port_cap_flags	= RXE_PORT_PORT_CAP_FLAGS;
124	port->attr.max_msg_sz		= RXE_PORT_MAX_MSG_SZ;
125	port->attr.bad_pkey_cntr	= RXE_PORT_BAD_PKEY_CNTR;
126	port->attr.qkey_viol_cntr	= RXE_PORT_QKEY_VIOL_CNTR;
127	port->attr.pkey_tbl_len		= RXE_PORT_PKEY_TBL_LEN;
128	port->attr.lid			= RXE_PORT_LID;
129	port->attr.sm_lid		= RXE_PORT_SM_LID;
130	port->attr.lmc			= RXE_PORT_LMC;
131	port->attr.max_vl_num		= RXE_PORT_MAX_VL_NUM;
132	port->attr.sm_sl		= RXE_PORT_SM_SL;
133	port->attr.subnet_timeout	= RXE_PORT_SUBNET_TIMEOUT;
134	port->attr.init_type_reply	= RXE_PORT_INIT_TYPE_REPLY;
135	port->attr.active_width		= RXE_PORT_ACTIVE_WIDTH;
136	port->attr.active_speed		= RXE_PORT_ACTIVE_SPEED;
137	port->attr.phys_state		= RXE_PORT_PHYS_STATE;
138	port->mtu_cap			= ib_mtu_enum_to_int(IB_MTU_256);
139	port->subnet_prefix		= cpu_to_be64(RXE_PORT_SUBNET_PREFIX);
140}
141
142/* initialize port state, note IB convention that HCA ports are always
143 * numbered from 1
144 */
145static void rxe_init_ports(struct rxe_dev *rxe, struct net_device *ndev)
146{
147	struct rxe_port *port = &rxe->port;
148
149	rxe_init_port_param(port);
150	addrconf_addr_eui48((unsigned char *)&port->port_guid,
151			    rxe->raw_gid);
152	spin_lock_init(&port->port_lock);
153}
154
155/* init pools of managed objects */
156static void rxe_init_pools(struct rxe_dev *rxe)
157{
158	rxe_pool_init(rxe, &rxe->uc_pool, RXE_TYPE_UC);
159	rxe_pool_init(rxe, &rxe->pd_pool, RXE_TYPE_PD);
160	rxe_pool_init(rxe, &rxe->ah_pool, RXE_TYPE_AH);
161	rxe_pool_init(rxe, &rxe->srq_pool, RXE_TYPE_SRQ);
162	rxe_pool_init(rxe, &rxe->qp_pool, RXE_TYPE_QP);
163	rxe_pool_init(rxe, &rxe->cq_pool, RXE_TYPE_CQ);
164	rxe_pool_init(rxe, &rxe->mr_pool, RXE_TYPE_MR);
165	rxe_pool_init(rxe, &rxe->mw_pool, RXE_TYPE_MW);
166}
167
168/* initialize rxe device state */
169static void rxe_init(struct rxe_dev *rxe, struct net_device *ndev)
170{
171	/* init default device parameters */
172	rxe_init_device_param(rxe, ndev);
173
174	rxe_init_ports(rxe, ndev);
175	rxe_init_pools(rxe);
176
177	/* init pending mmap list */
178	spin_lock_init(&rxe->mmap_offset_lock);
179	spin_lock_init(&rxe->pending_lock);
180	INIT_LIST_HEAD(&rxe->pending_mmaps);
181
182	/* init multicast support */
183	spin_lock_init(&rxe->mcg_lock);
184	rxe->mcg_tree = RB_ROOT;
185
186	mutex_init(&rxe->usdev_lock);
187}
188
189void rxe_set_mtu(struct rxe_dev *rxe, unsigned int ndev_mtu)
190{
191	struct rxe_port *port = &rxe->port;
192	enum ib_mtu mtu;
193
194	mtu = eth_mtu_int_to_enum(ndev_mtu);
195
196	/* Make sure that new MTU in range */
197	mtu = mtu ? min_t(enum ib_mtu, mtu, IB_MTU_4096) : IB_MTU_256;
198
199	port->attr.active_mtu = mtu;
200	port->mtu_cap = ib_mtu_enum_to_int(mtu);
201}
202
203/* called by ifc layer to create new rxe device.
204 * The caller should allocate memory for rxe by calling ib_alloc_device.
205 */
206int rxe_add(struct rxe_dev *rxe, unsigned int mtu, const char *ibdev_name,
207			struct net_device *ndev)
208{
209	rxe_init(rxe, ndev);
210	rxe_set_mtu(rxe, mtu);
211
212	return rxe_register_device(rxe, ibdev_name, ndev);
213}
214
215static int rxe_newlink(const char *ibdev_name, struct net_device *ndev)
216{
217	struct rxe_dev *rxe;
218	int err = 0;
219
220	if (is_vlan_dev(ndev)) {
221		rxe_err("rxe creation allowed on top of a real device only\n");
222		err = -EPERM;
223		goto err;
224	}
225
226	rxe = rxe_get_dev_from_net(ndev);
227	if (rxe) {
228		ib_device_put(&rxe->ib_dev);
229		rxe_err_dev(rxe, "already configured on %s\n", ndev->name);
230		err = -EEXIST;
231		goto err;
232	}
233
234	err = rxe_net_add(ibdev_name, ndev);
235	if (err) {
236		rxe_err("failed to add %s\n", ndev->name);
237		goto err;
238	}
239err:
240	return err;
241}
242
243static struct rdma_link_ops rxe_link_ops = {
244	.type = "rxe",
245	.newlink = rxe_newlink,
246};
247
248static int __init rxe_module_init(void)
249{
250	int err;
251
252	err = rxe_alloc_wq();
253	if (err)
254		return err;
255
256	err = rxe_net_init();
257	if (err) {
258		rxe_destroy_wq();
259		return err;
260	}
261
262	rdma_link_register(&rxe_link_ops);
263	pr_info("loaded\n");
264	return 0;
265}
266
267static void __exit rxe_module_exit(void)
268{
269	rdma_link_unregister(&rxe_link_ops);
270	ib_unregister_driver(RDMA_DRIVER_RXE);
271	rxe_net_exit();
272	rxe_destroy_wq();
273
274	pr_info("unloaded\n");
275}
276
277late_initcall(rxe_module_init);
278module_exit(rxe_module_exit);
279
280MODULE_ALIAS_RDMA_LINK("rxe");