diff options
Diffstat (limited to 'drivers/infiniband/sw/rdmavt/vt.c')
| -rw-r--r-- | drivers/infiniband/sw/rdmavt/vt.c | 619 |
1 files changed, 619 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rdmavt/vt.c b/drivers/infiniband/sw/rdmavt/vt.c new file mode 100644 index 0000000000..d61f8de7f2 --- /dev/null +++ b/drivers/infiniband/sw/rdmavt/vt.c @@ -0,0 +1,619 @@ +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause +/* + * Copyright(c) 2016 - 2018 Intel Corporation. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/dma-mapping.h> +#include "vt.h" +#include "cq.h" +#include "trace.h" + +#define RVT_UVERBS_ABI_VERSION 2 + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_DESCRIPTION("RDMA Verbs Transport Library"); + +static int __init rvt_init(void) +{ + int ret = rvt_driver_cq_init(); + + if (ret) + pr_err("Error in driver CQ init.\n"); + + return ret; +} +module_init(rvt_init); + +static void __exit rvt_cleanup(void) +{ + rvt_cq_exit(); +} +module_exit(rvt_cleanup); + +/** + * rvt_alloc_device - allocate rdi + * @size: how big of a structure to allocate + * @nports: number of ports to allocate array slots for + * + * Use IB core device alloc to allocate space for the rdi which is assumed to be + * inside of the ib_device. Any extra space that drivers require should be + * included in size. + * + * We also allocate a port array based on the number of ports. + * + * Return: pointer to allocated rdi + */ +struct rvt_dev_info *rvt_alloc_device(size_t size, int nports) +{ + struct rvt_dev_info *rdi; + + rdi = container_of(_ib_alloc_device(size), struct rvt_dev_info, ibdev); + if (!rdi) + return rdi; + + rdi->ports = kcalloc(nports, sizeof(*rdi->ports), GFP_KERNEL); + if (!rdi->ports) + ib_dealloc_device(&rdi->ibdev); + + return rdi; +} +EXPORT_SYMBOL(rvt_alloc_device); + +/** + * rvt_dealloc_device - deallocate rdi + * @rdi: structure to free + * + * Free a structure allocated with rvt_alloc_device() + */ +void rvt_dealloc_device(struct rvt_dev_info *rdi) +{ + kfree(rdi->ports); + ib_dealloc_device(&rdi->ibdev); +} +EXPORT_SYMBOL(rvt_dealloc_device); + +static int rvt_query_device(struct ib_device *ibdev, + struct ib_device_attr *props, + struct ib_udata *uhw) +{ + struct rvt_dev_info *rdi = ib_to_rvt(ibdev); + + if (uhw->inlen || uhw->outlen) + return -EINVAL; + /* + * Return rvt_dev_info.dparms.props contents + */ + *props = rdi->dparms.props; + return 0; +} + +static int rvt_get_numa_node(struct ib_device *ibdev) +{ + struct rvt_dev_info *rdi = ib_to_rvt(ibdev); + + return rdi->dparms.node; +} + +static int rvt_modify_device(struct ib_device *device, + int device_modify_mask, + struct ib_device_modify *device_modify) +{ + /* + * There is currently no need to supply this based on qib and hfi1. + * Future drivers may need to implement this though. + */ + + return -EOPNOTSUPP; +} + +/** + * rvt_query_port - Passes the query port call to the driver + * @ibdev: Verbs IB dev + * @port_num: port number, 1 based from ib core + * @props: structure to hold returned properties + * + * Return: 0 on success + */ +static int rvt_query_port(struct ib_device *ibdev, u32 port_num, + struct ib_port_attr *props) +{ + struct rvt_dev_info *rdi = ib_to_rvt(ibdev); + struct rvt_ibport *rvp; + u32 port_index = ibport_num_to_idx(ibdev, port_num); + + rvp = rdi->ports[port_index]; + /* props being zeroed by the caller, avoid zeroing it here */ + props->sm_lid = rvp->sm_lid; + props->sm_sl = rvp->sm_sl; + props->port_cap_flags = rvp->port_cap_flags; + props->max_msg_sz = 0x80000000; + props->pkey_tbl_len = rvt_get_npkeys(rdi); + props->bad_pkey_cntr = rvp->pkey_violations; + props->qkey_viol_cntr = rvp->qkey_violations; + props->subnet_timeout = rvp->subnet_timeout; + props->init_type_reply = 0; + + /* Populate the remaining ib_port_attr elements */ + return rdi->driver_f.query_port_state(rdi, port_num, props); +} + +/** + * rvt_modify_port - modify port + * @ibdev: Verbs IB dev + * @port_num: Port number, 1 based from ib core + * @port_modify_mask: How to change the port + * @props: Structure to fill in + * + * Return: 0 on success + */ +static int rvt_modify_port(struct ib_device *ibdev, u32 port_num, + int port_modify_mask, struct ib_port_modify *props) +{ + struct rvt_dev_info *rdi = ib_to_rvt(ibdev); + struct rvt_ibport *rvp; + int ret = 0; + u32 port_index = ibport_num_to_idx(ibdev, port_num); + + rvp = rdi->ports[port_index]; + if (port_modify_mask & IB_PORT_OPA_MASK_CHG) { + rvp->port_cap3_flags |= props->set_port_cap_mask; + rvp->port_cap3_flags &= ~props->clr_port_cap_mask; + } else { + rvp->port_cap_flags |= props->set_port_cap_mask; + rvp->port_cap_flags &= ~props->clr_port_cap_mask; + } + + if (props->set_port_cap_mask || props->clr_port_cap_mask) + rdi->driver_f.cap_mask_chg(rdi, port_num); + if (port_modify_mask & IB_PORT_SHUTDOWN) + ret = rdi->driver_f.shut_down_port(rdi, port_num); + if (port_modify_mask & IB_PORT_RESET_QKEY_CNTR) + rvp->qkey_violations = 0; + + return ret; +} + +/** + * rvt_query_pkey - Return a pkey from the table at a given index + * @ibdev: Verbs IB dev + * @port_num: Port number, 1 based from ib core + * @index: Index into pkey table + * @pkey: returned pkey from the port pkey table + * + * Return: 0 on failure pkey otherwise + */ +static int rvt_query_pkey(struct ib_device *ibdev, u32 port_num, u16 index, + u16 *pkey) +{ + /* + * Driver will be responsible for keeping rvt_dev_info.pkey_table up to + * date. This function will just return that value. There is no need to + * lock, if a stale value is read and sent to the user so be it there is + * no way to protect against that anyway. + */ + struct rvt_dev_info *rdi = ib_to_rvt(ibdev); + u32 port_index; + + port_index = ibport_num_to_idx(ibdev, port_num); + + if (index >= rvt_get_npkeys(rdi)) + return -EINVAL; + + *pkey = rvt_get_pkey(rdi, port_index, index); + return 0; +} + +/** + * rvt_query_gid - Return a gid from the table + * @ibdev: Verbs IB dev + * @port_num: Port number, 1 based from ib core + * @guid_index: Index in table + * @gid: Gid to return + * + * Return: 0 on success + */ +static int rvt_query_gid(struct ib_device *ibdev, u32 port_num, + int guid_index, union ib_gid *gid) +{ + struct rvt_dev_info *rdi; + struct rvt_ibport *rvp; + u32 port_index; + + /* + * Driver is responsible for updating the guid table. Which will be used + * to craft the return value. This will work similar to how query_pkey() + * is being done. + */ + port_index = ibport_num_to_idx(ibdev, port_num); + + rdi = ib_to_rvt(ibdev); + rvp = rdi->ports[port_index]; + + gid->global.subnet_prefix = rvp->gid_prefix; + + return rdi->driver_f.get_guid_be(rdi, rvp, guid_index, + &gid->global.interface_id); +} + +/** + * rvt_alloc_ucontext - Allocate a user context + * @uctx: Verbs context + * @udata: User data allocated + */ +static int rvt_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata) +{ + return 0; +} + +/** + * rvt_dealloc_ucontext - Free a user context + * @context: Unused + */ +static void rvt_dealloc_ucontext(struct ib_ucontext *context) +{ + return; +} + +static int rvt_get_port_immutable(struct ib_device *ibdev, u32 port_num, + struct ib_port_immutable *immutable) +{ + struct rvt_dev_info *rdi = ib_to_rvt(ibdev); + struct ib_port_attr attr; + int err; + + immutable->core_cap_flags = rdi->dparms.core_cap_flags; + + err = ib_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + immutable->max_mad_size = rdi->dparms.max_mad_size; + + return 0; +} + +enum { + MISC, + QUERY_DEVICE, + MODIFY_DEVICE, + QUERY_PORT, + MODIFY_PORT, + QUERY_PKEY, + QUERY_GID, + ALLOC_UCONTEXT, + DEALLOC_UCONTEXT, + GET_PORT_IMMUTABLE, + CREATE_QP, + MODIFY_QP, + DESTROY_QP, + QUERY_QP, + POST_SEND, + POST_RECV, + POST_SRQ_RECV, + CREATE_AH, + DESTROY_AH, + MODIFY_AH, + QUERY_AH, + CREATE_SRQ, + MODIFY_SRQ, + DESTROY_SRQ, + QUERY_SRQ, + ATTACH_MCAST, + DETACH_MCAST, + GET_DMA_MR, + REG_USER_MR, + DEREG_MR, + ALLOC_MR, + MAP_MR_SG, + ALLOC_FMR, + MAP_PHYS_FMR, + UNMAP_FMR, + DEALLOC_FMR, + MMAP, + CREATE_CQ, + DESTROY_CQ, + POLL_CQ, + REQ_NOTFIY_CQ, + RESIZE_CQ, + ALLOC_PD, + DEALLOC_PD, + _VERB_IDX_MAX /* Must always be last! */ +}; + +static const struct ib_device_ops rvt_dev_ops = { + .uverbs_abi_ver = RVT_UVERBS_ABI_VERSION, + + .alloc_mr = rvt_alloc_mr, + .alloc_pd = rvt_alloc_pd, + .alloc_ucontext = rvt_alloc_ucontext, + .attach_mcast = rvt_attach_mcast, + .create_ah = rvt_create_ah, + .create_cq = rvt_create_cq, + .create_qp = rvt_create_qp, + .create_srq = rvt_create_srq, + .create_user_ah = rvt_create_ah, + .dealloc_pd = rvt_dealloc_pd, + .dealloc_ucontext = rvt_dealloc_ucontext, + .dereg_mr = rvt_dereg_mr, + .destroy_ah = rvt_destroy_ah, + .destroy_cq = rvt_destroy_cq, + .destroy_qp = rvt_destroy_qp, + .destroy_srq = rvt_destroy_srq, + .detach_mcast = rvt_detach_mcast, + .get_dma_mr = rvt_get_dma_mr, + .get_numa_node = rvt_get_numa_node, + .get_port_immutable = rvt_get_port_immutable, + .map_mr_sg = rvt_map_mr_sg, + .mmap = rvt_mmap, + .modify_ah = rvt_modify_ah, + .modify_device = rvt_modify_device, + .modify_port = rvt_modify_port, + .modify_qp = rvt_modify_qp, + .modify_srq = rvt_modify_srq, + .poll_cq = rvt_poll_cq, + .post_recv = rvt_post_recv, + .post_send = rvt_post_send, + .post_srq_recv = rvt_post_srq_recv, + .query_ah = rvt_query_ah, + .query_device = rvt_query_device, + .query_gid = rvt_query_gid, + .query_pkey = rvt_query_pkey, + .query_port = rvt_query_port, + .query_qp = rvt_query_qp, + .query_srq = rvt_query_srq, + .reg_user_mr = rvt_reg_user_mr, + .req_notify_cq = rvt_req_notify_cq, + .resize_cq = rvt_resize_cq, + + INIT_RDMA_OBJ_SIZE(ib_ah, rvt_ah, ibah), + INIT_RDMA_OBJ_SIZE(ib_cq, rvt_cq, ibcq), + INIT_RDMA_OBJ_SIZE(ib_pd, rvt_pd, ibpd), + INIT_RDMA_OBJ_SIZE(ib_qp, rvt_qp, ibqp), + INIT_RDMA_OBJ_SIZE(ib_srq, rvt_srq, ibsrq), + INIT_RDMA_OBJ_SIZE(ib_ucontext, rvt_ucontext, ibucontext), +}; + +static noinline int check_support(struct rvt_dev_info *rdi, int verb) +{ + switch (verb) { + case MISC: + /* + * These functions are not part of verbs specifically but are + * required for rdmavt to function. + */ + if ((!rdi->ibdev.ops.port_groups) || + (!rdi->driver_f.get_pci_dev)) + return -EINVAL; + break; + + case MODIFY_DEVICE: + /* + * rdmavt does not support modify device currently drivers must + * provide. + */ + if (!rdi->ibdev.ops.modify_device) + return -EOPNOTSUPP; + break; + + case QUERY_PORT: + if (!rdi->ibdev.ops.query_port) + if (!rdi->driver_f.query_port_state) + return -EINVAL; + break; + + case MODIFY_PORT: + if (!rdi->ibdev.ops.modify_port) + if (!rdi->driver_f.cap_mask_chg || + !rdi->driver_f.shut_down_port) + return -EINVAL; + break; + + case QUERY_GID: + if (!rdi->ibdev.ops.query_gid) + if (!rdi->driver_f.get_guid_be) + return -EINVAL; + break; + + case CREATE_QP: + if (!rdi->ibdev.ops.create_qp) + if (!rdi->driver_f.qp_priv_alloc || + !rdi->driver_f.qp_priv_free || + !rdi->driver_f.notify_qp_reset || + !rdi->driver_f.flush_qp_waiters || + !rdi->driver_f.stop_send_queue || + !rdi->driver_f.quiesce_qp) + return -EINVAL; + break; + + case MODIFY_QP: + if (!rdi->ibdev.ops.modify_qp) + if (!rdi->driver_f.notify_qp_reset || + !rdi->driver_f.schedule_send || + !rdi->driver_f.get_pmtu_from_attr || + !rdi->driver_f.flush_qp_waiters || + !rdi->driver_f.stop_send_queue || + !rdi->driver_f.quiesce_qp || + !rdi->driver_f.notify_error_qp || + !rdi->driver_f.mtu_from_qp || + !rdi->driver_f.mtu_to_path_mtu) + return -EINVAL; + break; + + case DESTROY_QP: + if (!rdi->ibdev.ops.destroy_qp) + if (!rdi->driver_f.qp_priv_free || + !rdi->driver_f.notify_qp_reset || + !rdi->driver_f.flush_qp_waiters || + !rdi->driver_f.stop_send_queue || + !rdi->driver_f.quiesce_qp) + return -EINVAL; + break; + + case POST_SEND: + if (!rdi->ibdev.ops.post_send) + if (!rdi->driver_f.schedule_send || + !rdi->driver_f.do_send || + !rdi->post_parms) + return -EINVAL; + break; + + } + + return 0; +} + +/** + * rvt_register_device - register a driver + * @rdi: main dev structure for all of rdmavt operations + * + * It is up to drivers to allocate the rdi and fill in the appropriate + * information. + * + * Return: 0 on success otherwise an errno. + */ +int rvt_register_device(struct rvt_dev_info *rdi) +{ + int ret = 0, i; + + if (!rdi) + return -EINVAL; + + /* + * Check to ensure drivers have setup the required helpers for the verbs + * they want rdmavt to handle + */ + for (i = 0; i < _VERB_IDX_MAX; i++) + if (check_support(rdi, i)) { + pr_err("Driver support req not met at %d\n", i); + return -EINVAL; + } + + ib_set_device_ops(&rdi->ibdev, &rvt_dev_ops); + + /* Once we get past here we can use rvt_pr macros and tracepoints */ + trace_rvt_dbg(rdi, "Driver attempting registration"); + rvt_mmap_init(rdi); + + /* Queue Pairs */ + ret = rvt_driver_qp_init(rdi); + if (ret) { + pr_err("Error in driver QP init.\n"); + return -EINVAL; + } + + /* Address Handle */ + spin_lock_init(&rdi->n_ahs_lock); + rdi->n_ahs_allocated = 0; + + /* Shared Receive Queue */ + rvt_driver_srq_init(rdi); + + /* Multicast */ + rvt_driver_mcast_init(rdi); + + /* Mem Region */ + ret = rvt_driver_mr_init(rdi); + if (ret) { + pr_err("Error in driver MR init.\n"); + goto bail_no_mr; + } + + /* Memory Working Set Size */ + ret = rvt_wss_init(rdi); + if (ret) { + rvt_pr_err(rdi, "Error in WSS init.\n"); + goto bail_mr; + } + + /* Completion queues */ + spin_lock_init(&rdi->n_cqs_lock); + + /* Protection Domain */ + spin_lock_init(&rdi->n_pds_lock); + rdi->n_pds_allocated = 0; + + /* + * There are some things which could be set by underlying drivers but + * really should be up to rdmavt to set. For instance drivers can't know + * exactly which functions rdmavt supports, nor do they know the ABI + * version, so we do all of this sort of stuff here. + */ + rdi->ibdev.uverbs_cmd_mask |= + (1ull << IB_USER_VERBS_CMD_POLL_CQ) | + (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) | + (1ull << IB_USER_VERBS_CMD_POST_SEND) | + (1ull << IB_USER_VERBS_CMD_POST_RECV) | + (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV); + rdi->ibdev.node_type = RDMA_NODE_IB_CA; + if (!rdi->ibdev.num_comp_vectors) + rdi->ibdev.num_comp_vectors = 1; + + /* We are now good to announce we exist */ + ret = ib_register_device(&rdi->ibdev, dev_name(&rdi->ibdev.dev), NULL); + if (ret) { + rvt_pr_err(rdi, "Failed to register driver with ib core.\n"); + goto bail_wss; + } + + rvt_create_mad_agents(rdi); + + rvt_pr_info(rdi, "Registration with rdmavt done.\n"); + return ret; + +bail_wss: + rvt_wss_exit(rdi); +bail_mr: + rvt_mr_exit(rdi); + +bail_no_mr: + rvt_qp_exit(rdi); + + return ret; +} +EXPORT_SYMBOL(rvt_register_device); + +/** + * rvt_unregister_device - remove a driver + * @rdi: rvt dev struct + */ +void rvt_unregister_device(struct rvt_dev_info *rdi) +{ + trace_rvt_dbg(rdi, "Driver is unregistering."); + if (!rdi) + return; + + rvt_free_mad_agents(rdi); + + ib_unregister_device(&rdi->ibdev); + rvt_wss_exit(rdi); + rvt_mr_exit(rdi); + rvt_qp_exit(rdi); +} +EXPORT_SYMBOL(rvt_unregister_device); + +/** + * rvt_init_port - init internal data for driver port + * @rdi: rvt_dev_info struct + * @port: rvt port + * @port_index: 0 based index of ports, different from IB core port num + * @pkey_table: pkey_table for @port + * + * Keep track of a list of ports. No need to have a detach port. + * They persist until the driver goes away. + * + * Return: always 0 + */ +int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port, + int port_index, u16 *pkey_table) +{ + + rdi->ports[port_index] = port; + rdi->ports[port_index]->pkey_table = pkey_table; + + return 0; +} +EXPORT_SYMBOL(rvt_init_port); |