new file mode 100644
@@ -0,0 +1,610 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RDMA Transport Layer
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+#undef pr_fmt
+#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
+
+#include <linux/module.h>
+#include <linux/inet.h>
+
+#include "rtrs-pri.h"
+#include "rtrs-log.h"
+
+MODULE_DESCRIPTION("RDMA Transport Core");
+MODULE_LICENSE("GPL");
+
+struct rtrs_iu *rtrs_iu_alloc(u32 queue_size, size_t size, gfp_t gfp_mask,
+ struct ib_device *dma_dev,
+ enum dma_data_direction dir,
+ void (*done)(struct ib_cq *cq, struct ib_wc *wc))
+{
+ struct rtrs_iu *ius, *iu;
+ int i;
+
+ ius = kcalloc(queue_size, sizeof(*ius), gfp_mask);
+ if (!ius)
+ return NULL;
+ for (i = 0; i < queue_size; i++) {
+ iu = &ius[i];
+ iu->buf = kzalloc(size, gfp_mask);
+ if (!iu->buf)
+ goto err;
+
+ iu->dma_addr = ib_dma_map_single(dma_dev, iu->buf, size, dir);
+ if (ib_dma_mapping_error(dma_dev, iu->dma_addr))
+ goto err;
+
+ iu->cqe.done = done;
+ iu->size = size;
+ iu->direction = dir;
+ }
+ return ius;
+err:
+ rtrs_iu_free(ius, dir, dma_dev, i);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_alloc);
+
+void rtrs_iu_free(struct rtrs_iu *ius, enum dma_data_direction dir,
+ struct ib_device *ibdev, u32 queue_size)
+{
+ struct rtrs_iu *iu;
+ int i;
+
+ if (!ius)
+ return;
+
+ for (i = 0; i < queue_size; i++) {
+ iu = &ius[i];
+ ib_dma_unmap_single(ibdev, iu->dma_addr, iu->size, dir);
+ kfree(iu->buf);
+ }
+ kfree(ius);
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_free);
+
+int rtrs_iu_post_recv(struct rtrs_con *con, struct rtrs_iu *iu)
+{
+ struct rtrs_sess *sess = con->sess;
+ struct ib_recv_wr wr;
+ struct ib_sge list;
+
+ list.addr = iu->dma_addr;
+ list.length = iu->size;
+ list.lkey = sess->dev->ib_pd->local_dma_lkey;
+
+ if (list.length == 0) {
+ rtrs_wrn(con->sess,
+ "Posting receive work request failed, sg list is empty\n");
+ return -EINVAL;
+ }
+ wr = (struct ib_recv_wr) {
+ .wr_cqe = &iu->cqe,
+ .sg_list = &list,
+ .num_sge = 1,
+ };
+
+ return ib_post_recv(con->qp, &wr, NULL);
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_post_recv);
+
+int rtrs_post_recv_empty(struct rtrs_con *con, struct ib_cqe *cqe)
+{
+ struct ib_recv_wr wr;
+
+ wr = (struct ib_recv_wr) {
+ .wr_cqe = cqe,
+ };
+
+ return ib_post_recv(con->qp, &wr, NULL);
+}
+EXPORT_SYMBOL_GPL(rtrs_post_recv_empty);
+
+int rtrs_iu_post_send(struct rtrs_con *con, struct rtrs_iu *iu, size_t size,
+ struct ib_send_wr *head)
+{
+ struct rtrs_sess *sess = con->sess;
+ struct ib_send_wr 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;
+
+ wr = (struct ib_send_wr) {
+ .wr_cqe = &iu->cqe,
+ .sg_list = &list,
+ .num_sge = 1,
+ .opcode = IB_WR_SEND,
+ .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, NULL);
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_post_send);
+
+int rtrs_iu_post_rdma_write_imm(struct rtrs_con *con, struct rtrs_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_rdma_wr wr;
+ int i;
+
+ wr = (struct ib_rdma_wr) {
+ .wr.wr_cqe = &iu->cqe,
+ .wr.sg_list = sge,
+ .wr.num_sge = num_sge,
+ .rkey = rkey,
+ .remote_addr = rdma_addr,
+ .wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM,
+ .wr.ex.imm_data = cpu_to_be32(imm_data),
+ .wr.send_flags = flags,
+ };
+
+ /*
+ * If one of the sges has 0 size, the operation will fail with a
+ * 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, NULL);
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_post_rdma_write_imm);
+
+int rtrs_post_rdma_write_imm_empty(struct rtrs_con *con, struct ib_cqe *cqe,
+ u32 imm_data, enum ib_send_flags flags,
+ struct ib_send_wr *head)
+{
+ struct ib_send_wr wr;
+
+ wr = (struct ib_send_wr) {
+ .wr_cqe = cqe,
+ .send_flags = flags,
+ .opcode = IB_WR_RDMA_WRITE_WITH_IMM,
+ .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, NULL);
+}
+EXPORT_SYMBOL_GPL(rtrs_post_rdma_write_imm_empty);
+
+static void qp_event_handler(struct ib_event *ev, void *ctx)
+{
+ struct rtrs_con *con = ctx;
+
+ switch (ev->event) {
+ case IB_EVENT_COMM_EST:
+ rtrs_info(con->sess, "QP event %s (%d) received\n",
+ ib_event_msg(ev->event), ev->event);
+ rdma_notify(con->cm_id, IB_EVENT_COMM_EST);
+ break;
+ default:
+ rtrs_info(con->sess, "Unhandled QP event %s (%d) received\n",
+ ib_event_msg(ev->event), ev->event);
+ break;
+ }
+}
+
+static int create_cq(struct rtrs_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 (IS_ERR(cq)) {
+ rtrs_err(con->sess, "Creating completion queue failed, errno: %ld\n",
+ PTR_ERR(cq));
+ return PTR_ERR(cq);
+ }
+ con->cq = cq;
+
+ return 0;
+}
+
+static int create_qp(struct rtrs_con *con, struct ib_pd *pd,
+ u16 wr_queue_size, u32 max_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_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 (ret) {
+ rtrs_err(con->sess, "Creating QP failed, err: %d\n", ret);
+ return ret;
+ }
+ con->qp = cm_id->qp;
+
+ return ret;
+}
+
+int rtrs_cq_qp_create(struct rtrs_sess *sess, struct rtrs_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 (err)
+ return err;
+
+ err = create_qp(con, sess->dev->ib_pd, wr_queue_size, max_send_sge);
+ if (err) {
+ ib_free_cq(con->cq);
+ con->cq = NULL;
+ return err;
+ }
+ con->sess = sess;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rtrs_cq_qp_create);
+
+void rtrs_cq_qp_destroy(struct rtrs_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(rtrs_cq_qp_destroy);
+
+static void schedule_hb(struct rtrs_sess *sess)
+{
+ queue_delayed_work(sess->hb_wq, &sess->hb_dwork,
+ msecs_to_jiffies(sess->hb_interval_ms));
+}
+
+void rtrs_send_hb_ack(struct rtrs_sess *sess)
+{
+ struct rtrs_con *usr_con = sess->con[0];
+ u32 imm;
+ int err;
+
+ imm = rtrs_to_imm(RTRS_HB_ACK_IMM, 0);
+ err = rtrs_post_rdma_write_imm_empty(usr_con, sess->hb_cqe, imm,
+ IB_SEND_SIGNALED, NULL);
+ if (err) {
+ sess->hb_err_handler(usr_con);
+ return;
+ }
+}
+EXPORT_SYMBOL_GPL(rtrs_send_hb_ack);
+
+static void hb_work(struct work_struct *work)
+{
+ struct rtrs_con *usr_con;
+ struct rtrs_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);
+ return;
+ }
+ if (sess->hb_missed_cnt++) {
+ /* Reschedule work without sending hb */
+ schedule_hb(sess);
+ return;
+ }
+ imm = rtrs_to_imm(RTRS_HB_MSG_IMM, 0);
+ err = rtrs_post_rdma_write_imm_empty(usr_con, sess->hb_cqe, imm,
+ IB_SEND_SIGNALED, NULL);
+ if (err) {
+ sess->hb_err_handler(usr_con);
+ return;
+ }
+
+ schedule_hb(sess);
+}
+
+void rtrs_init_hb(struct rtrs_sess *sess, struct ib_cqe *cqe,
+ unsigned int interval_ms, unsigned int missed_max,
+ void (*err_handler)(struct rtrs_con *con),
+ 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(rtrs_init_hb);
+
+void rtrs_start_hb(struct rtrs_sess *sess)
+{
+ schedule_hb(sess);
+}
+EXPORT_SYMBOL_GPL(rtrs_start_hb);
+
+void rtrs_stop_hb(struct rtrs_sess *sess)
+{
+ cancel_delayed_work_sync(&sess->hb_dwork);
+ sess->hb_missed_cnt = 0;
+ sess->hb_missed_max = 0;
+}
+EXPORT_SYMBOL_GPL(rtrs_stop_hb);
+
+static int rtrs_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 IPv6 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;
+}
+
+/**
+ * rtrs_str_to_sockaddr() - Convert rtrs 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 rtrs_str_to_sockaddr(const char *addr, size_t len,
+ short port, struct sockaddr_storage *dst)
+{
+ if (strncmp(addr, "gid:", 4) == 0) {
+ return rtrs_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;
+}
+
+/**
+ * sockaddr_to_str() - convert sockaddr to a string.
+ * @addr: the sockadddr structure to be converted.
+ * @buf: string containing socket addr.
+ * @len: string length.
+ *
+ * The return value is the number of characters written into buf not
+ * including the trailing '\0'. If len is == 0 the function returns 0..
+ */
+int sockaddr_to_str(const struct sockaddr *addr, char *buf, size_t len)
+{
+
+ switch (addr->sa_family) {
+ case AF_IB:
+ return scnprintf(buf, len, "gid:%pI6",
+ &((struct sockaddr_ib *)addr)->sib_addr.sib_raw);
+ case AF_INET:
+ return scnprintf(buf, len, "ip:%pI4",
+ &((struct sockaddr_in *)addr)->sin_addr);
+ case AF_INET6:
+ return scnprintf(buf, len, "ip:%pI6c",
+ &((struct sockaddr_in6 *)addr)->sin6_addr);
+ }
+ return scnprintf(buf, len, "<invalid address family>");
+}
+EXPORT_SYMBOL(sockaddr_to_str);
+
+/**
+ * rtrs_addr_to_sockaddr() - convert path string "src,dst" to sockaddreses
+ * @str: string containing source and destination addr of a path
+ * separated by comma. I.e. "ip:1.1.1.1,ip:1.1.1.2". If str
+ * contains only one address it's considered to be destination.
+ * @len: string length
+ * @port: will be set to port.
+ * @addr: will be set to the source/destination address or to NULL
+ * if str doesn't contain any sorce address.
+ *
+ * Returns zero if conversion successful. Non-zero otherwise.
+ */
+int rtrs_addr_to_sockaddr(const char *str, size_t len, short port,
+ struct rtrs_addr *addr)
+{
+ const char *d;
+
+ d = strchr(str, ',');
+ if (!d)
+ d = strchr(str, '@');
+ if (d) {
+ if (rtrs_str_to_sockaddr(str, d - str, 0, addr->src))
+ return -EINVAL;
+ d += 1;
+ len -= d - str;
+ str = d;
+
+ } else {
+ addr->src = NULL;
+ }
+ return rtrs_str_to_sockaddr(str, len, port, addr->dst);
+}
+EXPORT_SYMBOL(rtrs_addr_to_sockaddr);
+
+void rtrs_rdma_dev_pd_init(enum ib_pd_flags pd_flags,
+ struct rtrs_rdma_dev_pd *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(rtrs_rdma_dev_pd_init);
+
+void rtrs_rdma_dev_pd_deinit(struct rtrs_rdma_dev_pd *pool)
+{
+ mutex_destroy(&pool->mutex);
+ WARN_ON(!list_empty(&pool->list));
+}
+EXPORT_SYMBOL(rtrs_rdma_dev_pd_deinit);
+
+static void dev_free(struct kref *ref)
+{
+ struct rtrs_rdma_dev_pd *pool;
+ struct rtrs_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 rtrs_ib_dev_put(struct rtrs_ib_dev *dev)
+{
+ return kref_put(&dev->ref, dev_free);
+}
+EXPORT_SYMBOL(rtrs_ib_dev_put);
+
+static int rtrs_ib_dev_get(struct rtrs_ib_dev *dev)
+{
+ return kref_get_unless_zero(&dev->ref);
+}
+
+struct rtrs_ib_dev *
+rtrs_ib_dev_find_or_add(struct ib_device *ib_dev,
+ struct rtrs_rdma_dev_pd *pool)
+{
+ struct rtrs_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 &&
+ rtrs_ib_dev_get(dev))
+ goto out_unlock;
+ }
+ mutex_unlock(&pool->mutex);
+ if (pool->ops && pool->ops->alloc)
+ dev = pool->ops->alloc();
+ else
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (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 (IS_ERR(dev->ib_pd))
+ goto out_free_dev;
+
+ if (pool->ops && pool->ops->init && pool->ops->init(dev))
+ goto out_free_pd;
+
+ mutex_lock(&pool->mutex);
+ 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:
+ return NULL;
+}
+EXPORT_SYMBOL(rtrs_ib_dev_find_or_add);