This is a set of library functions existing as a ibtrs-core module, used by client and server modules. Mainly these functions wrap IB and RDMA calls and provide a bit higher abstraction for implementing of IBTRS protocol on client or server sides. Signed-off-by: Roman Pen <roman.penyaev@xxxxxxxxxxxxxxxx> Signed-off-by: Danil Kipnis <danil.kipnis@xxxxxxxxxxxxxxxx> Cc: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxxx> --- drivers/infiniband/ulp/ibtrs/ibtrs.c | 609 +++++++++++++++++++++++++++++++++++ 1 file changed, 609 insertions(+) create mode 100644 drivers/infiniband/ulp/ibtrs/ibtrs.c diff --git a/drivers/infiniband/ulp/ibtrs/ibtrs.c b/drivers/infiniband/ulp/ibtrs/ibtrs.c new file mode 100644 index 000000000000..39a933fe528e --- /dev/null +++ b/drivers/infiniband/ulp/ibtrs/ibtrs.c @@ -0,0 +1,609 @@ +/* + * InfiniBand Transport Layer + * + * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved. + * Authors: Fabian Holler <mail@xxxxxxxxxx> + * Jack Wang <jinpu.wang@xxxxxxxxxxxxxxxx> + * Kleber Souza <kleber.souza@xxxxxxxxxxxxxxxx> + * Danil Kipnis <danil.kipnis@xxxxxxxxxxxxxxxx> + * Roman Penyaev <roman.penyaev@xxxxxxxxxxxxxxxx> + * Milind Dumbare <Milind.dumbare@xxxxxxxxx> + * + * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved. + * Authors: Danil Kipnis <danil.kipnis@xxxxxxxxxxxxxxxx> + * Roman Penyaev <roman.penyaev@xxxxxxxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#undef pr_fmt +#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt + +#include <linux/module.h> +#include <linux/inet.h> + +#include "ibtrs-pri.h" +#include "ibtrs-log.h" + +MODULE_AUTHOR("ibnbd@xxxxxxxxxxxxxxxx"); +MODULE_DESCRIPTION("IBTRS Core"); +MODULE_VERSION(IBTRS_VER_STRING); +MODULE_LICENSE("GPL"); + +struct ibtrs_iu *ibtrs_iu_alloc(u32 tag, size_t size, gfp_t gfp_mask, + struct ib_device *dma_dev, + enum dma_data_direction direction, + void (*done)(struct ib_cq *cq, + struct ib_wc *wc)) +{ + struct ibtrs_iu *iu; + + iu = kmalloc(sizeof(*iu), gfp_mask); + if (unlikely(!iu)) + return NULL; + + iu->buf = kzalloc(size, gfp_mask); + if (unlikely(!iu->buf)) + goto err1; + + iu->dma_addr = ib_dma_map_single(dma_dev, iu->buf, size, direction); + if (unlikely(ib_dma_mapping_error(dma_dev, iu->dma_addr))) + goto err2; + + iu->cqe.done = done; + iu->size = size; + iu->direction = direction; + iu->tag = tag; + + return iu; + +err2: + kfree(iu->buf); +err1: + kfree(iu); + + return NULL; +} +EXPORT_SYMBOL_GPL(ibtrs_iu_alloc); + +void ibtrs_iu_free(struct ibtrs_iu *iu, enum dma_data_direction dir, + struct ib_device *ibdev) +{ + if (!iu) + return; + + ib_dma_unmap_single(ibdev, iu->dma_addr, iu->size, dir); + kfree(iu->buf); + kfree(iu); +} +EXPORT_SYMBOL_GPL(ibtrs_iu_free); + +int ibtrs_iu_post_recv(struct ibtrs_con *con, struct ibtrs_iu *iu) +{ + struct ibtrs_sess *sess = con->sess; + struct ib_recv_wr wr, *bad_wr; + struct ib_sge list; + + list.addr = iu->dma_addr; + list.length = iu->size; + list.lkey = sess->dev->ib_pd->local_dma_lkey; + + if (WARN_ON(list.length == 0)) { + ibtrs_wrn(con, "Posting receive work request failed," + " sg list is empty\n"); + return -EINVAL; + } + + wr.next = NULL; + wr.wr_cqe = &iu->cqe; + wr.sg_list = &list; + wr.num_sge = 1; + + return ib_post_recv(con->qp, &wr, &bad_wr); +} +EXPORT_SYMBOL_GPL(ibtrs_iu_post_recv); + +int ibtrs_post_recv_empty(struct ibtrs_con *con, struct ib_cqe *cqe) +{ + struct ib_recv_wr wr, *bad_wr; + + wr.next = NULL; + wr.wr_cqe = cqe; + wr.sg_list = NULL; + wr.num_sge = 0; + + return ib_post_recv(con->qp, &wr, &bad_wr); +} +EXPORT_SYMBOL_GPL(ibtrs_post_recv_empty); + +int ibtrs_post_recv_empty_x2(struct ibtrs_con *con, struct ib_cqe *cqe) +{ + struct ib_recv_wr wr_arr[2], *wr, *bad_wr; + int i; + + memset(wr_arr, 0, sizeof(wr_arr)); + for (i = 0; i < ARRAY_SIZE(wr_arr); i++) { + wr = &wr_arr[i]; + wr->wr_cqe = cqe; + if (i) + /* Chain backwards */ + wr->next = &wr_arr[i - 1]; + } + + return ib_post_recv(con->qp, wr, &bad_wr); +} +EXPORT_SYMBOL_GPL(ibtrs_post_recv_empty_x2); + +int ibtrs_iu_post_send(struct ibtrs_con *con, struct ibtrs_iu *iu, size_t size, + struct ib_send_wr *head) +{ + struct ibtrs_sess *sess = con->sess; + struct ib_send_wr wr, *bad_wr; + struct ib_sge list; + + if ((WARN_ON(size == 0))) + return -EINVAL; + + list.addr = iu->dma_addr; + list.length = size; + list.lkey = sess->dev->ib_pd->local_dma_lkey; + + memset(&wr, 0, sizeof(wr)); + wr.next = NULL; + wr.wr_cqe = &iu->cqe; + wr.sg_list = &list; + wr.num_sge = 1; + wr.opcode = IB_WR_SEND; + wr.send_flags = IB_SEND_SIGNALED; + + if (head) { + struct ib_send_wr *tail = head; + + while (tail->next) + tail = tail->next; + tail->next = ≀ + } + else + head = ≀ + + return ib_post_send(con->qp, head, &bad_wr); +} +EXPORT_SYMBOL_GPL(ibtrs_iu_post_send); + +int ibtrs_iu_post_rdma_write_imm(struct ibtrs_con *con, struct ibtrs_iu *iu, + struct ib_sge *sge, unsigned int num_sge, + u32 rkey, u64 rdma_addr, u32 imm_data, + enum ib_send_flags flags, + struct ib_send_wr *head) +{ + struct ib_send_wr *bad_wr; + struct ib_rdma_wr wr; + int i; + + wr.wr.next = NULL; + wr.wr.wr_cqe = &iu->cqe; + wr.wr.sg_list = sge; + wr.wr.num_sge = num_sge; + wr.rkey = rkey; + wr.remote_addr = rdma_addr; + wr.wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM; + wr.wr.ex.imm_data = cpu_to_be32(imm_data); + wr.wr.send_flags = flags; + + /* + * If one of the sges has 0 size, the operation will fail with an + * length error + */ + for (i = 0; i < num_sge; i++) + if (WARN_ON(sge[i].length == 0)) + return -EINVAL; + + if (head) { + struct ib_send_wr *tail = head; + + while (tail->next) + tail = tail->next; + tail->next = &wr.wr; + } + else + head = &wr.wr; + + return ib_post_send(con->qp, head, &bad_wr); +} +EXPORT_SYMBOL_GPL(ibtrs_iu_post_rdma_write_imm); + +int ibtrs_post_rdma_write_imm_empty(struct ibtrs_con *con, struct ib_cqe *cqe, + u32 imm_data, enum ib_send_flags flags, + struct ib_send_wr *head) +{ + struct ib_send_wr wr, *bad_wr; + + memset(&wr, 0, sizeof(wr)); + wr.wr_cqe = cqe; + wr.send_flags = flags; + wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM; + wr.ex.imm_data = cpu_to_be32(imm_data); + + if (head) { + struct ib_send_wr *tail = head; + + while (tail->next) + tail = tail->next; + tail->next = ≀ + } + else + head = ≀ + + return ib_post_send(con->qp, head, &bad_wr); +} +EXPORT_SYMBOL_GPL(ibtrs_post_rdma_write_imm_empty); + +static void qp_event_handler(struct ib_event *ev, void *ctx) +{ + struct ibtrs_con *con = ctx; + + switch (ev->event) { + case IB_EVENT_COMM_EST: + ibtrs_info(con, "QP event %s (%d) received\n", + ib_event_msg(ev->event), ev->event); + rdma_notify(con->cm_id, IB_EVENT_COMM_EST); + break; + default: + ibtrs_info(con, "Unhandled QP event %s (%d) received\n", + ib_event_msg(ev->event), ev->event); + break; + } +} + +static int create_cq(struct ibtrs_con *con, int cq_vector, u16 cq_size, + enum ib_poll_context poll_ctx) +{ + struct rdma_cm_id *cm_id = con->cm_id; + struct ib_cq *cq; + + cq = ib_alloc_cq(cm_id->device, con, cq_size, + cq_vector, poll_ctx); + if (unlikely(IS_ERR(cq))) { + ibtrs_err(con, "Creating completion queue failed, errno: %ld\n", + PTR_ERR(cq)); + return PTR_ERR(cq); + } + con->cq = cq; + + return 0; +} + +static int create_qp(struct ibtrs_con *con, struct ib_pd *pd, + u16 wr_queue_size, u32 max_send_sge) +{ + struct ib_qp_init_attr init_attr = {NULL}; + struct rdma_cm_id *cm_id = con->cm_id; + int ret; + + init_attr.cap.max_send_wr = wr_queue_size; + init_attr.cap.max_recv_wr = wr_queue_size; + init_attr.cap.max_recv_sge = 1; + init_attr.event_handler = qp_event_handler; + init_attr.qp_context = con; + init_attr.cap.max_send_sge = max_send_sge; + + init_attr.qp_type = IB_QPT_RC; + init_attr.send_cq = con->cq; + init_attr.recv_cq = con->cq; + init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; + + ret = rdma_create_qp(cm_id, pd, &init_attr); + if (unlikely(ret)) { + ibtrs_err(con, "Creating QP failed, err: %d\n", ret); + return ret; + } + con->qp = cm_id->qp; + + return ret; +} + +int ibtrs_cq_qp_create(struct ibtrs_sess *sess, struct ibtrs_con *con, + u32 max_send_sge, int cq_vector, u16 cq_size, + u16 wr_queue_size, enum ib_poll_context poll_ctx) +{ + int err; + + err = create_cq(con, cq_vector, cq_size, poll_ctx); + if (unlikely(err)) + return err; + + err = create_qp(con, sess->dev->ib_pd, wr_queue_size, max_send_sge); + if (unlikely(err)) { + ib_free_cq(con->cq); + con->cq = NULL; + return err; + } + con->sess = sess; + + return 0; +} +EXPORT_SYMBOL_GPL(ibtrs_cq_qp_create); + +void ibtrs_cq_qp_destroy(struct ibtrs_con *con) +{ + if (con->qp) { + rdma_destroy_qp(con->cm_id); + con->qp = NULL; + } + if (con->cq) { + ib_free_cq(con->cq); + con->cq = NULL; + } +} +EXPORT_SYMBOL_GPL(ibtrs_cq_qp_destroy); + +static void schedule_hb(struct ibtrs_sess *sess) +{ + queue_delayed_work(sess->hb_wq, &sess->hb_dwork, + msecs_to_jiffies(sess->hb_interval_ms)); +} + +void ibtrs_send_hb_ack(struct ibtrs_sess *sess) +{ + struct ibtrs_con *usr_con = sess->con[0]; + u32 imm; + int err; + + imm = ibtrs_to_imm(IBTRS_HB_ACK_IMM, 0); + err = ibtrs_post_rdma_write_imm_empty(usr_con, sess->hb_cqe, imm, + IB_SEND_SIGNALED, NULL); + if (unlikely(err)) { + sess->hb_err_handler(usr_con, err); + return; + } +} +EXPORT_SYMBOL_GPL(ibtrs_send_hb_ack); + +static void hb_work(struct work_struct *work) +{ + struct ibtrs_con *usr_con; + struct ibtrs_sess *sess; + u32 imm; + int err; + + sess = container_of(to_delayed_work(work), typeof(*sess), hb_dwork); + usr_con = sess->con[0]; + + if (sess->hb_missed_cnt > sess->hb_missed_max) { + sess->hb_err_handler(usr_con, -ETIMEDOUT); + return; + } + if (sess->hb_missed_cnt++) { + /* Reschedule work without sending hb */ + schedule_hb(sess); + return; + } + imm = ibtrs_to_imm(IBTRS_HB_MSG_IMM, 0); + err = ibtrs_post_rdma_write_imm_empty(usr_con, sess->hb_cqe, imm, + IB_SEND_SIGNALED, NULL); + if (unlikely(err)) { + sess->hb_err_handler(usr_con, err); + return; + } + + schedule_hb(sess); +} + +void ibtrs_init_hb(struct ibtrs_sess *sess, struct ib_cqe *cqe, + unsigned int interval_ms, unsigned int missed_max, + ibtrs_hb_handler_t *err_handler, + struct workqueue_struct *wq) +{ + sess->hb_cqe = cqe; + sess->hb_interval_ms = interval_ms; + sess->hb_err_handler = err_handler; + sess->hb_wq = wq; + sess->hb_missed_max = missed_max; + sess->hb_missed_cnt = 0; + INIT_DELAYED_WORK(&sess->hb_dwork, hb_work); +} +EXPORT_SYMBOL_GPL(ibtrs_init_hb); + +void ibtrs_start_hb(struct ibtrs_sess *sess) +{ + schedule_hb(sess); +} +EXPORT_SYMBOL_GPL(ibtrs_start_hb); + +void ibtrs_stop_hb(struct ibtrs_sess *sess) +{ + cancel_delayed_work_sync(&sess->hb_dwork); + sess->hb_missed_cnt = 0; + sess->hb_missed_max = 0; +} +EXPORT_SYMBOL_GPL(ibtrs_stop_hb); + +static int ibtrs_str_gid_to_sockaddr(const char *addr, size_t len, + short port, struct sockaddr_storage *dst) +{ + struct sockaddr_ib *dst_ib = (struct sockaddr_ib *)dst; + int ret; + + /* + * We can use some of the I6 functions since GID is a valid + * IPv6 address format + */ + ret = in6_pton(addr, len, dst_ib->sib_addr.sib_raw, '\0', NULL); + if (ret == 0) + return -EINVAL; + + dst_ib->sib_family = AF_IB; + /* + * Use the same TCP server port number as the IB service ID + * on the IB port space range + */ + dst_ib->sib_sid = cpu_to_be64(RDMA_IB_IP_PS_IB | port); + dst_ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL); + dst_ib->sib_pkey = cpu_to_be16(0xffff); + + return 0; +} + +/** + * ibtrs_str_to_sockaddr() - Convert ibtrs address string to sockaddr + * @addr String representation of an addr (IPv4, IPv6 or IB GID): + * - "ip:192.168.1.1" + * - "ip:fe80::200:5aee:feaa:20a2" + * - "gid:fe80::200:5aee:feaa:20a2" + * @len String address length + * @port Destination port + * @dst Destination sockaddr structure + * + * Returns 0 if conversion successful. Non-zero on error. + */ +static int ibtrs_str_to_sockaddr(const char *addr, size_t len, + short port, struct sockaddr_storage *dst) +{ + if (strncmp(addr, "gid:", 4) == 0) { + return ibtrs_str_gid_to_sockaddr(addr + 4, len - 4, port, dst); + } else if (strncmp(addr, "ip:", 3) == 0) { + char port_str[8]; + char *cpy; + int err; + + snprintf(port_str, sizeof(port_str), "%u", port); + cpy = kstrndup(addr + 3, len - 3, GFP_KERNEL); + err = cpy ? inet_pton_with_scope(&init_net, AF_UNSPEC, + cpy, port_str, dst) : -ENOMEM; + kfree(cpy); + + return err; + } + return -EPROTONOSUPPORT; +} + +int ibtrs_addr_to_sockaddr(const char *str, size_t len, short port, + struct ibtrs_addr *addr) +{ + const char *d; + int ret; + + d = strchr(str, ','); + if (d) { + if (ibtrs_str_to_sockaddr(str, d - str, 0, addr->src)) + return -EINVAL; + d += 1; + len -= d - str; + str = d; + + } else { + addr->src = NULL; + } + ret = ibtrs_str_to_sockaddr(str, len, port, addr->dst); + + return ret; +} +EXPORT_SYMBOL(ibtrs_addr_to_sockaddr); + +void ibtrs_ib_dev_pool_init(enum ib_pd_flags pd_flags, + struct ibtrs_ib_dev_pool *pool) +{ + WARN_ON(pool->ops && (!pool->ops->alloc ^ !pool->ops->free)); + INIT_LIST_HEAD(&pool->list); + mutex_init(&pool->mutex); + pool->pd_flags = pd_flags; +} +EXPORT_SYMBOL(ibtrs_ib_dev_pool_init); + +void ibtrs_ib_dev_pool_deinit(struct ibtrs_ib_dev_pool *pool) +{ + WARN_ON(!list_empty(&pool->list)); +} +EXPORT_SYMBOL(ibtrs_ib_dev_pool_deinit); + +static void dev_free(struct kref *ref) +{ + struct ibtrs_ib_dev_pool *pool; + struct ibtrs_ib_dev *dev; + + dev = container_of(ref, typeof(*dev), ref); + pool = dev->pool; + + mutex_lock(&pool->mutex); + list_del(&dev->entry); + mutex_unlock(&pool->mutex); + + if (pool->ops && pool->ops->deinit) + pool->ops->deinit(dev); + + ib_dealloc_pd(dev->ib_pd); + + if (pool->ops && pool->ops->free) + pool->ops->free(dev); + else + kfree(dev); +} + +int ibtrs_ib_dev_put(struct ibtrs_ib_dev *dev) +{ + return kref_put(&dev->ref, dev_free); +} +EXPORT_SYMBOL(ibtrs_ib_dev_put); + +static int ibtrs_ib_dev_get(struct ibtrs_ib_dev *dev) +{ + return kref_get_unless_zero(&dev->ref); +} + +struct ibtrs_ib_dev * +ibtrs_ib_dev_find_or_add(struct ib_device *ib_dev, + struct ibtrs_ib_dev_pool *pool) +{ + struct ibtrs_ib_dev *dev; + + mutex_lock(&pool->mutex); + list_for_each_entry(dev, &pool->list, entry) { + if (dev->ib_dev->node_guid == ib_dev->node_guid && + ibtrs_ib_dev_get(dev)) + goto out_unlock; + } + if (pool->ops && pool->ops->alloc) + dev = pool->ops->alloc(); + else + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (unlikely(IS_ERR_OR_NULL(dev))) + goto out_err; + + kref_init(&dev->ref); + dev->pool = pool; + dev->ib_dev = ib_dev; + dev->ib_pd = ib_alloc_pd(ib_dev, pool->pd_flags); + if (unlikely(IS_ERR(dev->ib_pd))) + goto out_free_dev; + + if (pool->ops && pool->ops->init && pool->ops->init(dev)) + goto out_free_pd; + + list_add(&dev->entry, &pool->list); +out_unlock: + mutex_unlock(&pool->mutex); + return dev; + +out_free_pd: + ib_dealloc_pd(dev->ib_pd); +out_free_dev: + if (pool->ops && pool->ops->free) + pool->ops->free(dev); + else + kfree(dev); +out_err: + mutex_unlock(&pool->mutex); + return NULL; +} +EXPORT_SYMBOL(ibtrs_ib_dev_find_or_add); -- 2.13.1
