new file mode 100644
@@ -0,0 +1,2175 @@
+// 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/mempool.h>
+
+#include "rtrs-srv.h"
+#include "rtrs-log.h"
+
+MODULE_DESCRIPTION("RDMA Transport Server");
+MODULE_LICENSE("GPL");
+
+/* Must be power of 2, see mask from mr->page_size in ib_sg_to_pages() */
+#define DEFAULT_MAX_CHUNK_SIZE (128 << 10)
+#define DEFAULT_SESS_QUEUE_DEPTH 512
+#define MAX_HDR_SIZE PAGE_SIZE
+
+/* We guarantee to serve 10 paths at least */
+#define CHUNK_POOL_SZ 10
+
+static struct rtrs_rdma_dev_pd dev_pd;
+static mempool_t *chunk_pool;
+struct class *rtrs_dev_class;
+
+static int __read_mostly max_chunk_size = DEFAULT_MAX_CHUNK_SIZE;
+static int __read_mostly sess_queue_depth = DEFAULT_SESS_QUEUE_DEPTH;
+
+static bool always_invalidate = true;
+module_param(always_invalidate, bool, 0444);
+MODULE_PARM_DESC(always_invalidate,
+ "Invalidate memory registration for contiguous memory regions before accessing.");
+
+module_param_named(max_chunk_size, max_chunk_size, int, 0444);
+MODULE_PARM_DESC(max_chunk_size,
+ "Max size for each IO request, when change the unit is in byte (default: "
+ __stringify(DEFAULT_MAX_CHUNK_SIZE) "KB)");
+
+module_param_named(sess_queue_depth, sess_queue_depth, int, 0444);
+MODULE_PARM_DESC(sess_queue_depth,
+ "Number of buffers for pending I/O requests to allocate per session. Maximum: "
+ __stringify(MAX_SESS_QUEUE_DEPTH) " (default: "
+ __stringify(DEFAULT_SESS_QUEUE_DEPTH) ")");
+
+static cpumask_t cq_affinity_mask = { CPU_BITS_ALL };
+
+static struct workqueue_struct *rtrs_wq;
+
+static inline struct rtrs_srv_con *to_srv_con(struct rtrs_con *c)
+{
+ return container_of(c, struct rtrs_srv_con, c);
+}
+
+static inline struct rtrs_srv_sess *to_srv_sess(struct rtrs_sess *s)
+{
+ return container_of(s, struct rtrs_srv_sess, s);
+}
+
+static bool __rtrs_srv_change_state(struct rtrs_srv_sess *sess,
+ enum rtrs_srv_state new_state)
+{
+ enum rtrs_srv_state old_state;
+ bool changed = false;
+
+ lockdep_assert_held(&sess->state_lock);
+ old_state = sess->state;
+ switch (new_state) {
+ case RTRS_SRV_CONNECTED:
+ switch (old_state) {
+ case RTRS_SRV_CONNECTING:
+ changed = true;
+ fallthrough;
+ default:
+ break;
+ }
+ break;
+ case RTRS_SRV_CLOSING:
+ switch (old_state) {
+ case RTRS_SRV_CONNECTING:
+ case RTRS_SRV_CONNECTED:
+ changed = true;
+ fallthrough;
+ default:
+ break;
+ }
+ break;
+ case RTRS_SRV_CLOSED:
+ switch (old_state) {
+ case RTRS_SRV_CLOSING:
+ changed = true;
+ fallthrough;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ if (changed)
+ sess->state = new_state;
+
+ return changed;
+}
+
+static bool rtrs_srv_change_state_get_old(struct rtrs_srv_sess *sess,
+ enum rtrs_srv_state new_state,
+ enum rtrs_srv_state *old_state)
+{
+ bool changed;
+
+ spin_lock_irq(&sess->state_lock);
+ *old_state = sess->state;
+ changed = __rtrs_srv_change_state(sess, new_state);
+ spin_unlock_irq(&sess->state_lock);
+
+ return changed;
+}
+
+static bool rtrs_srv_change_state(struct rtrs_srv_sess *sess,
+ enum rtrs_srv_state new_state)
+{
+ enum rtrs_srv_state old_state;
+
+ return rtrs_srv_change_state_get_old(sess, new_state, &old_state);
+}
+
+static void free_id(struct rtrs_srv_op *id)
+{
+ if (!id)
+ return;
+ kfree(id);
+}
+
+static void rtrs_srv_free_ops_ids(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+ int i;
+
+ WARN_ON(atomic_read(&sess->ids_inflight));
+ if (sess->ops_ids) {
+ for (i = 0; i < srv->queue_depth; i++)
+ free_id(sess->ops_ids[i]);
+ kfree(sess->ops_ids);
+ sess->ops_ids = NULL;
+ }
+}
+
+static void rtrs_srv_rdma_done(struct ib_cq *cq, struct ib_wc *wc);
+
+static struct ib_cqe io_comp_cqe = {
+ .done = rtrs_srv_rdma_done
+};
+
+static int rtrs_srv_alloc_ops_ids(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_srv_op *id;
+ int i;
+
+ sess->ops_ids = kcalloc(srv->queue_depth, sizeof(*sess->ops_ids),
+ GFP_KERNEL);
+ if (!sess->ops_ids)
+ goto err;
+
+ for (i = 0; i < srv->queue_depth; ++i) {
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id)
+ goto err;
+
+ sess->ops_ids[i] = id;
+ }
+ init_waitqueue_head(&sess->ids_waitq);
+ atomic_set(&sess->ids_inflight, 0);
+
+ return 0;
+
+err:
+ rtrs_srv_free_ops_ids(sess);
+ return -ENOMEM;
+}
+
+static inline void rtrs_srv_get_ops_ids(struct rtrs_srv_sess *sess)
+{
+ atomic_inc(&sess->ids_inflight);
+}
+
+static inline void rtrs_srv_put_ops_ids(struct rtrs_srv_sess *sess)
+{
+ if (atomic_dec_and_test(&sess->ids_inflight))
+ wake_up(&sess->ids_waitq);
+}
+
+static void rtrs_srv_wait_ops_ids(struct rtrs_srv_sess *sess)
+{
+ wait_event(sess->ids_waitq, !atomic_read(&sess->ids_inflight));
+}
+
+
+static void rtrs_srv_reg_mr_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct rtrs_srv_con *con = cq->cq_context;
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ rtrs_err(s, "REG MR failed: %s\n",
+ ib_wc_status_msg(wc->status));
+ close_sess(sess);
+ return;
+ }
+}
+
+static struct ib_cqe local_reg_cqe = {
+ .done = rtrs_srv_reg_mr_done
+};
+
+static int rdma_write_sg(struct rtrs_srv_op *id)
+{
+ struct rtrs_sess *s = id->con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ dma_addr_t dma_addr = sess->dma_addr[id->msg_id];
+ struct rtrs_srv_mr *srv_mr;
+ struct rtrs_srv *srv = sess->srv;
+ struct ib_send_wr inv_wr, imm_wr;
+ struct ib_rdma_wr *wr = NULL;
+ enum ib_send_flags flags;
+ size_t sg_cnt;
+ int err, offset;
+ bool need_inval;
+ u32 rkey = 0;
+ struct ib_reg_wr rwr;
+ struct ib_sge *list;
+
+ sg_cnt = le16_to_cpu(id->rd_msg->sg_cnt);
+ need_inval = le16_to_cpu(id->rd_msg->flags) & RTRS_MSG_NEED_INVAL_F;
+ if (unlikely(sg_cnt != 1))
+ return -EINVAL;
+
+ offset = 0;
+
+ wr = &id->tx_wr;
+ list = &id->tx_sg;
+ list->addr = dma_addr + offset;
+ list->length = le32_to_cpu(id->rd_msg->desc[0].len);
+
+ /* WR will fail with length error
+ * if this is 0
+ */
+ if (unlikely(list->length == 0)) {
+ rtrs_err(s, "Invalid RDMA-Write sg list length 0\n");
+ return -EINVAL;
+ }
+
+ list->lkey = sess->s.dev->ib_pd->local_dma_lkey;
+ offset += list->length;
+
+ wr->wr.sg_list = list;
+ wr->wr.num_sge = 1;
+ wr->remote_addr = le64_to_cpu(id->rd_msg->desc[0].addr);
+ wr->rkey = le32_to_cpu(id->rd_msg->desc[0].key);
+ if (rkey == 0)
+ rkey = wr->rkey;
+ else
+ /* Only one key is actually used */
+ WARN_ON_ONCE(rkey != wr->rkey);
+
+ wr->wr.opcode = IB_WR_RDMA_WRITE;
+ wr->wr.ex.imm_data = 0;
+ wr->wr.send_flags = 0;
+
+ if (need_inval && always_invalidate) {
+ wr->wr.next = &rwr.wr;
+ rwr.wr.next = &inv_wr;
+ inv_wr.next = &imm_wr;
+ } else if (always_invalidate) {
+ wr->wr.next = &rwr.wr;
+ rwr.wr.next = &imm_wr;
+ } else if (need_inval) {
+ wr->wr.next = &inv_wr;
+ inv_wr.next = &imm_wr;
+ } else {
+ wr->wr.next = &imm_wr;
+ }
+ /*
+ * From time to time we have to post signaled sends,
+ * or send queue will fill up and only QP reset can help.
+ */
+ flags = atomic_inc_return(&id->con->wr_cnt) % srv->queue_depth ?
+ 0 : IB_SEND_SIGNALED;
+
+ if (need_inval) {
+ inv_wr.sg_list = NULL;
+ inv_wr.num_sge = 0;
+ inv_wr.opcode = IB_WR_SEND_WITH_INV;
+ inv_wr.send_flags = 0;
+ inv_wr.ex.invalidate_rkey = rkey;
+ }
+
+ imm_wr.next = NULL;
+ if (always_invalidate) {
+ struct ib_sge list;
+ struct rtrs_msg_rkey_rsp *msg;
+
+ srv_mr = &sess->mrs[id->msg_id];
+ rwr.wr.opcode = IB_WR_REG_MR;
+ rwr.wr.num_sge = 0;
+ rwr.mr = srv_mr->mr;
+ rwr.wr.send_flags = 0;
+ rwr.key = srv_mr->mr->rkey;
+ rwr.access = (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE);
+ msg = srv_mr->iu->buf;
+ msg->buf_id = cpu_to_le16(id->msg_id);
+ msg->type = cpu_to_le16(RTRS_MSG_RKEY_RSP);
+ msg->rkey = cpu_to_le32(srv_mr->mr->rkey);
+
+ list.addr = srv_mr->iu->dma_addr;
+ list.length = sizeof(*msg);
+ list.lkey = sess->s.dev->ib_pd->local_dma_lkey;
+ imm_wr.sg_list = &list;
+ imm_wr.num_sge = 1;
+ imm_wr.opcode = IB_WR_SEND_WITH_IMM;
+ ib_dma_sync_single_for_device(sess->s.dev->ib_dev,
+ srv_mr->iu->dma_addr,
+ srv_mr->iu->size, DMA_TO_DEVICE);
+ } else {
+ imm_wr.sg_list = NULL;
+ imm_wr.num_sge = 0;
+ imm_wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM;
+ }
+ imm_wr.send_flags = flags;
+ imm_wr.ex.imm_data = cpu_to_be32(rtrs_to_io_rsp_imm(id->msg_id,
+ 0, need_inval));
+
+ imm_wr.wr_cqe = &io_comp_cqe;
+ ib_dma_sync_single_for_device(sess->s.dev->ib_dev, dma_addr,
+ offset, DMA_BIDIRECTIONAL);
+
+ err = ib_post_send(id->con->c.qp, &id->tx_wr.wr, NULL);
+ if (unlikely(err))
+ rtrs_err(s,
+ "Posting RDMA-Write-Request to QP failed, err: %d\n",
+ err);
+
+ return err;
+}
+
+/**
+ * send_io_resp_imm() - respond to client with empty IMM on failed READ/WRITE
+ * requests or on successful WRITE request.
+ * @con: the connection to send back result
+ * @id: the id associated with the IO
+ * @errno: the error number of the IO.
+ *
+ * Return 0 on success, errno otherwise.
+ */
+static int send_io_resp_imm(struct rtrs_srv_con *con, struct rtrs_srv_op *id,
+ int errno)
+{
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct ib_send_wr inv_wr, imm_wr, *wr = NULL;
+ struct ib_reg_wr rwr;
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_srv_mr *srv_mr;
+ bool need_inval = false;
+ enum ib_send_flags flags;
+ u32 imm;
+ int err;
+
+ if (id->dir == READ) {
+ struct rtrs_msg_rdma_read *rd_msg = id->rd_msg;
+ size_t sg_cnt;
+
+ need_inval = le16_to_cpu(rd_msg->flags) &
+ RTRS_MSG_NEED_INVAL_F;
+ sg_cnt = le16_to_cpu(rd_msg->sg_cnt);
+
+ if (need_inval) {
+ if (likely(sg_cnt)) {
+ inv_wr.sg_list = NULL;
+ inv_wr.num_sge = 0;
+ inv_wr.opcode = IB_WR_SEND_WITH_INV;
+ inv_wr.send_flags = 0;
+ /* Only one key is actually used */
+ inv_wr.ex.invalidate_rkey =
+ le32_to_cpu(rd_msg->desc[0].key);
+ } else {
+ WARN_ON_ONCE(1);
+ need_inval = false;
+ }
+ }
+ }
+
+ if (need_inval && always_invalidate) {
+ wr = &inv_wr;
+ inv_wr.next = &rwr.wr;
+ rwr.wr.next = &imm_wr;
+ } else if (always_invalidate) {
+ wr = &rwr.wr;
+ rwr.wr.next = &imm_wr;
+ } else if (need_inval) {
+ wr = &inv_wr;
+ inv_wr.next = &imm_wr;
+ } else {
+ wr = &imm_wr;
+ }
+ /*
+ * From time to time we have to post signalled sends,
+ * or send queue will fill up and only QP reset can help.
+ */
+ flags = atomic_inc_return(&con->wr_cnt) % srv->queue_depth ?
+ 0 : IB_SEND_SIGNALED;
+ imm = rtrs_to_io_rsp_imm(id->msg_id, errno, need_inval);
+ imm_wr.next = NULL;
+ if (always_invalidate) {
+ struct ib_sge list;
+ struct rtrs_msg_rkey_rsp *msg;
+
+ srv_mr = &sess->mrs[id->msg_id];
+ rwr.wr.next = &imm_wr;
+ rwr.wr.opcode = IB_WR_REG_MR;
+ rwr.wr.num_sge = 0;
+ rwr.wr.send_flags = 0;
+ rwr.mr = srv_mr->mr;
+ rwr.key = srv_mr->mr->rkey;
+ rwr.access = (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE);
+ msg = srv_mr->iu->buf;
+ msg->buf_id = cpu_to_le16(id->msg_id);
+ msg->type = cpu_to_le16(RTRS_MSG_RKEY_RSP);
+ msg->rkey = cpu_to_le32(srv_mr->mr->rkey);
+
+ list.addr = srv_mr->iu->dma_addr;
+ list.length = sizeof(*msg);
+ list.lkey = sess->s.dev->ib_pd->local_dma_lkey;
+ imm_wr.sg_list = &list;
+ imm_wr.num_sge = 1;
+ imm_wr.opcode = IB_WR_SEND_WITH_IMM;
+ ib_dma_sync_single_for_device(sess->s.dev->ib_dev,
+ srv_mr->iu->dma_addr,
+ srv_mr->iu->size, DMA_TO_DEVICE);
+ } else {
+ imm_wr.sg_list = NULL;
+ imm_wr.num_sge = 0;
+ imm_wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM;
+ }
+ imm_wr.send_flags = flags;
+ imm_wr.wr_cqe = &io_comp_cqe;
+
+ imm_wr.ex.imm_data = cpu_to_be32(imm);
+
+ err = ib_post_send(id->con->c.qp, wr, NULL);
+ if (unlikely(err))
+ rtrs_err_rl(s, "Posting RDMA-Reply to QP failed, err: %d\n",
+ err);
+
+ return err;
+}
+
+void close_sess(struct rtrs_srv_sess *sess)
+{
+ enum rtrs_srv_state old_state;
+
+ if (rtrs_srv_change_state_get_old(sess, RTRS_SRV_CLOSING,
+ &old_state))
+ queue_work(rtrs_wq, &sess->close_work);
+ WARN_ON(sess->state != RTRS_SRV_CLOSING);
+}
+
+static inline const char *rtrs_srv_state_str(enum rtrs_srv_state state)
+{
+ switch (state) {
+ case RTRS_SRV_CONNECTING:
+ return "RTRS_SRV_CONNECTING";
+ case RTRS_SRV_CONNECTED:
+ return "RTRS_SRV_CONNECTED";
+ case RTRS_SRV_CLOSING:
+ return "RTRS_SRV_CLOSING";
+ case RTRS_SRV_CLOSED:
+ return "RTRS_SRV_CLOSED";
+ default:
+ return "UNKNOWN";
+ }
+}
+
+/**
+ * rtrs_srv_resp_rdma() - Finish an RDMA request
+ *
+ * @id: Internal RTRS operation identifier
+ * @status: Response Code sent to the other side for this operation.
+ * 0 = success, <=0 error
+ * Context: any
+ *
+ * Finish a RDMA operation. A message is sent to the client and the
+ * corresponding memory areas will be released.
+ */
+bool rtrs_srv_resp_rdma(struct rtrs_srv_op *id, int status)
+{
+ struct rtrs_srv_con *con = id->con;
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ int err;
+
+ if (WARN_ON(!id))
+ return true;
+
+ id->status = status;
+
+ if (unlikely(sess->state != RTRS_SRV_CONNECTED)) {
+ rtrs_err_rl(s,
+ "Sending I/O response failed, session is disconnected, sess state %s\n",
+ rtrs_srv_state_str(sess->state));
+ goto out;
+ }
+ if (always_invalidate) {
+ struct rtrs_srv_mr *mr = &sess->mrs[id->msg_id];
+
+ ib_update_fast_reg_key(mr->mr, ib_inc_rkey(mr->mr->rkey));
+ }
+ if (unlikely(atomic_sub_return(1,
+ &con->sq_wr_avail) < 0)) {
+ pr_err("IB send queue full\n");
+ atomic_add(1, &con->sq_wr_avail);
+ spin_lock(&con->rsp_wr_wait_lock);
+ list_add_tail(&id->wait_list, &con->rsp_wr_wait_list);
+ spin_unlock(&con->rsp_wr_wait_lock);
+ return false;
+ }
+
+ if (status || id->dir == WRITE || !id->rd_msg->sg_cnt)
+ err = send_io_resp_imm(con, id, status);
+ else
+ err = rdma_write_sg(id);
+
+ if (unlikely(err)) {
+ rtrs_err_rl(s, "IO response failed: %d\n", err);
+ close_sess(sess);
+ }
+out:
+ rtrs_srv_put_ops_ids(sess);
+ return true;
+}
+EXPORT_SYMBOL(rtrs_srv_resp_rdma);
+
+/**
+ * rtrs_srv_set_sess_priv() - Set private pointer in rtrs_srv.
+ * @srv: Session pointer
+ * @priv: The private pointer that is associated with the session.
+ */
+void rtrs_srv_set_sess_priv(struct rtrs_srv *srv, void *priv)
+{
+ srv->priv = priv;
+}
+EXPORT_SYMBOL(rtrs_srv_set_sess_priv);
+
+static void unmap_cont_bufs(struct rtrs_srv_sess *sess)
+{
+ int i;
+
+ for (i = 0; i < sess->mrs_num; i++) {
+ struct rtrs_srv_mr *srv_mr;
+
+ srv_mr = &sess->mrs[i];
+ rtrs_iu_free(srv_mr->iu, DMA_TO_DEVICE,
+ sess->s.dev->ib_dev, 1);
+ ib_dereg_mr(srv_mr->mr);
+ ib_dma_unmap_sg(sess->s.dev->ib_dev, srv_mr->sgt.sgl,
+ srv_mr->sgt.nents, DMA_BIDIRECTIONAL);
+ sg_free_table(&srv_mr->sgt);
+ }
+ kfree(sess->mrs);
+}
+
+static int map_cont_bufs(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_sess *ss = &sess->s;
+ int i, mri, err, mrs_num;
+ unsigned int chunk_bits;
+ int chunks_per_mr = 1;
+
+ /*
+ * Here we map queue_depth chunks to MR. Firstly we have to
+ * figure out how many chunks can we map per MR.
+ */
+ if (always_invalidate) {
+ /*
+ * in order to do invalidate for each chunks of memory, we needs
+ * more memory regions.
+ */
+ mrs_num = srv->queue_depth;
+ } else {
+ chunks_per_mr =
+ sess->s.dev->ib_dev->attrs.max_fast_reg_page_list_len;
+ mrs_num = DIV_ROUND_UP(srv->queue_depth, chunks_per_mr);
+ chunks_per_mr = DIV_ROUND_UP(srv->queue_depth, mrs_num);
+ }
+
+ sess->mrs = kcalloc(mrs_num, sizeof(*sess->mrs), GFP_KERNEL);
+ if (!sess->mrs)
+ return -ENOMEM;
+
+ sess->mrs_num = mrs_num;
+
+ for (mri = 0; mri < mrs_num; mri++) {
+ struct rtrs_srv_mr *srv_mr = &sess->mrs[mri];
+ struct sg_table *sgt = &srv_mr->sgt;
+ struct scatterlist *s;
+ struct ib_mr *mr;
+ int nr, chunks;
+ struct rtrs_msg_rkey_rsp *rsp;
+
+ chunks = chunks_per_mr * mri;
+ if (!always_invalidate)
+ chunks_per_mr = min_t(int, chunks_per_mr,
+ srv->queue_depth - chunks);
+
+ err = sg_alloc_table(sgt, chunks_per_mr, GFP_KERNEL);
+ if (err)
+ goto err;
+
+ for_each_sg(sgt->sgl, s, chunks_per_mr, i)
+ sg_set_page(s, srv->chunks[chunks + i],
+ max_chunk_size, 0);
+
+ nr = ib_dma_map_sg(sess->s.dev->ib_dev, sgt->sgl,
+ sgt->nents, DMA_BIDIRECTIONAL);
+ if (nr < sgt->nents) {
+ err = nr < 0 ? nr : -EINVAL;
+ goto free_sg;
+ }
+ mr = ib_alloc_mr(sess->s.dev->ib_pd, IB_MR_TYPE_MEM_REG,
+ sgt->nents);
+ if (IS_ERR(mr)) {
+ err = PTR_ERR(mr);
+ goto unmap_sg;
+ }
+ nr = ib_map_mr_sg(mr, sgt->sgl, sgt->nents,
+ NULL, max_chunk_size);
+ if (nr < sgt->nents) {
+ err = nr < 0 ? nr : -EINVAL;
+ goto dereg_mr;
+ }
+
+ if (always_invalidate) {
+ srv_mr->iu = rtrs_iu_alloc(1, sizeof(*rsp), GFP_KERNEL,
+ sess->s.dev->ib_dev,
+ DMA_TO_DEVICE,
+ rtrs_srv_rdma_done);
+ if (!srv_mr->iu) {
+ rtrs_err(ss, "rtrs_iu_alloc(), err: %d\n",
+ -ENOMEM);
+ goto free_iu;
+ }
+ }
+ /* Eventually dma addr for each chunk can be cached */
+ for_each_sg(sgt->sgl, s, sgt->orig_nents, i)
+ sess->dma_addr[chunks + i] = sg_dma_address(s);
+
+ ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
+ srv_mr->mr = mr;
+
+ continue;
+err:
+ while (mri--) {
+ srv_mr = &sess->mrs[mri];
+ sgt = &srv_mr->sgt;
+ mr = srv_mr->mr;
+free_iu:
+ rtrs_iu_free(srv_mr->iu, DMA_TO_DEVICE,
+ sess->s.dev->ib_dev, 1);
+dereg_mr:
+ ib_dereg_mr(mr);
+unmap_sg:
+ ib_dma_unmap_sg(sess->s.dev->ib_dev, sgt->sgl,
+ sgt->nents, DMA_BIDIRECTIONAL);
+free_sg:
+ sg_free_table(sgt);
+ }
+ kfree(sess->mrs);
+
+ return err;
+ }
+
+ chunk_bits = ilog2(srv->queue_depth - 1) + 1;
+ sess->mem_bits = (MAX_IMM_PAYL_BITS - chunk_bits);
+
+ return 0;
+}
+
+static void rtrs_srv_hb_err_handler(struct rtrs_con *c)
+{
+ close_sess(to_srv_sess(c->sess));
+}
+
+static void rtrs_srv_init_hb(struct rtrs_srv_sess *sess)
+{
+ rtrs_init_hb(&sess->s, &io_comp_cqe,
+ RTRS_HB_INTERVAL_MS,
+ RTRS_HB_MISSED_MAX,
+ rtrs_srv_hb_err_handler,
+ rtrs_wq);
+}
+
+static void rtrs_srv_start_hb(struct rtrs_srv_sess *sess)
+{
+ rtrs_start_hb(&sess->s);
+}
+
+static void rtrs_srv_stop_hb(struct rtrs_srv_sess *sess)
+{
+ rtrs_stop_hb(&sess->s);
+}
+
+static void rtrs_srv_info_rsp_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct rtrs_srv_con *con = cq->cq_context;
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct rtrs_iu *iu;
+
+ iu = container_of(wc->wr_cqe, struct rtrs_iu, cqe);
+ rtrs_iu_free(iu, DMA_TO_DEVICE, sess->s.dev->ib_dev, 1);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ rtrs_err(s, "Sess info response send failed: %s\n",
+ ib_wc_status_msg(wc->status));
+ close_sess(sess);
+ return;
+ }
+ WARN_ON(wc->opcode != IB_WC_SEND);
+}
+
+static void rtrs_srv_sess_up(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_srv_ctx *ctx = srv->ctx;
+ int up;
+
+ mutex_lock(&srv->paths_ev_mutex);
+ up = ++srv->paths_up;
+ if (up == 1)
+ ctx->ops.link_ev(srv, RTRS_SRV_LINK_EV_CONNECTED, NULL);
+ mutex_unlock(&srv->paths_ev_mutex);
+
+ /* Mark session as established */
+ sess->established = true;
+}
+
+static void rtrs_srv_sess_down(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_srv_ctx *ctx = srv->ctx;
+
+ if (!sess->established)
+ return;
+
+ sess->established = false;
+ mutex_lock(&srv->paths_ev_mutex);
+ WARN_ON(!srv->paths_up);
+ if (--srv->paths_up == 0)
+ ctx->ops.link_ev(srv, RTRS_SRV_LINK_EV_DISCONNECTED, srv->priv);
+ mutex_unlock(&srv->paths_ev_mutex);
+}
+
+static int post_recv_sess(struct rtrs_srv_sess *sess);
+
+static int process_info_req(struct rtrs_srv_con *con,
+ struct rtrs_msg_info_req *msg)
+{
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct ib_send_wr *reg_wr = NULL;
+ struct rtrs_msg_info_rsp *rsp;
+ struct rtrs_iu *tx_iu;
+ struct ib_reg_wr *rwr;
+ int mri, err;
+ size_t tx_sz;
+
+ err = post_recv_sess(sess);
+ if (unlikely(err)) {
+ rtrs_err(s, "post_recv_sess(), err: %d\n", err);
+ return err;
+ }
+ rwr = kcalloc(sess->mrs_num, sizeof(*rwr), GFP_KERNEL);
+ if (unlikely(!rwr))
+ return -ENOMEM;
+ strlcpy(sess->s.sessname, msg->sessname, sizeof(sess->s.sessname));
+
+ tx_sz = sizeof(*rsp);
+ tx_sz += sizeof(rsp->desc[0]) * sess->mrs_num;
+ tx_iu = rtrs_iu_alloc(1, tx_sz, GFP_KERNEL, sess->s.dev->ib_dev,
+ DMA_TO_DEVICE, rtrs_srv_info_rsp_done);
+ if (unlikely(!tx_iu)) {
+ err = -ENOMEM;
+ goto rwr_free;
+ }
+
+ rsp = tx_iu->buf;
+ rsp->type = cpu_to_le16(RTRS_MSG_INFO_RSP);
+ rsp->sg_cnt = cpu_to_le16(sess->mrs_num);
+
+ for (mri = 0; mri < sess->mrs_num; mri++) {
+ struct ib_mr *mr = sess->mrs[mri].mr;
+
+ rsp->desc[mri].addr = cpu_to_le64(mr->iova);
+ rsp->desc[mri].key = cpu_to_le32(mr->rkey);
+ rsp->desc[mri].len = cpu_to_le32(mr->length);
+
+ /*
+ * Fill in reg MR request and chain them *backwards*
+ */
+ rwr[mri].wr.next = mri ? &rwr[mri - 1].wr : NULL;
+ rwr[mri].wr.opcode = IB_WR_REG_MR;
+ rwr[mri].wr.wr_cqe = &local_reg_cqe;
+ rwr[mri].wr.num_sge = 0;
+ rwr[mri].wr.send_flags = mri ? 0 : IB_SEND_SIGNALED;
+ rwr[mri].mr = mr;
+ rwr[mri].key = mr->rkey;
+ rwr[mri].access = (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE);
+ reg_wr = &rwr[mri].wr;
+ }
+
+ err = rtrs_srv_create_sess_files(sess);
+ if (unlikely(err))
+ goto iu_free;
+ kobject_get(&sess->kobj);
+ get_device(&sess->srv->dev);
+ rtrs_srv_change_state(sess, RTRS_SRV_CONNECTED);
+ rtrs_srv_start_hb(sess);
+
+ /*
+ * We do not account number of established connections at the current
+ * moment, we rely on the client, which should send info request when
+ * all connections are successfully established. Thus, simply notify
+ * listener with a proper event if we are the first path.
+ */
+ rtrs_srv_sess_up(sess);
+
+ ib_dma_sync_single_for_device(sess->s.dev->ib_dev, tx_iu->dma_addr,
+ tx_iu->size, DMA_TO_DEVICE);
+
+ /* Send info response */
+ err = rtrs_iu_post_send(&con->c, tx_iu, tx_sz, reg_wr);
+ if (unlikely(err)) {
+ rtrs_err(s, "rtrs_iu_post_send(), err: %d\n", err);
+iu_free:
+ rtrs_iu_free(tx_iu, DMA_TO_DEVICE, sess->s.dev->ib_dev, 1);
+ }
+rwr_free:
+ kfree(rwr);
+
+ return err;
+}
+
+static void rtrs_srv_info_req_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct rtrs_srv_con *con = cq->cq_context;
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct rtrs_msg_info_req *msg;
+ struct rtrs_iu *iu;
+ int err;
+
+ WARN_ON(con->c.cid);
+
+ iu = container_of(wc->wr_cqe, struct rtrs_iu, cqe);
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ rtrs_err(s, "Sess info request receive failed: %s\n",
+ ib_wc_status_msg(wc->status));
+ goto close;
+ }
+ WARN_ON(wc->opcode != IB_WC_RECV);
+
+ if (unlikely(wc->byte_len < sizeof(*msg))) {
+ rtrs_err(s, "Sess info request is malformed: size %d\n",
+ wc->byte_len);
+ goto close;
+ }
+ ib_dma_sync_single_for_cpu(sess->s.dev->ib_dev, iu->dma_addr,
+ iu->size, DMA_FROM_DEVICE);
+ msg = iu->buf;
+ if (unlikely(le16_to_cpu(msg->type) != RTRS_MSG_INFO_REQ)) {
+ rtrs_err(s, "Sess info request is malformed: type %d\n",
+ le16_to_cpu(msg->type));
+ goto close;
+ }
+ err = process_info_req(con, msg);
+ if (unlikely(err))
+ goto close;
+
+out:
+ rtrs_iu_free(iu, DMA_FROM_DEVICE, sess->s.dev->ib_dev, 1);
+ return;
+close:
+ close_sess(sess);
+ goto out;
+}
+
+static int post_recv_info_req(struct rtrs_srv_con *con)
+{
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct rtrs_iu *rx_iu;
+ int err;
+
+ rx_iu = rtrs_iu_alloc(1, sizeof(struct rtrs_msg_info_req),
+ GFP_KERNEL, sess->s.dev->ib_dev,
+ DMA_FROM_DEVICE, rtrs_srv_info_req_done);
+ if (unlikely(!rx_iu))
+ return -ENOMEM;
+ /* Prepare for getting info response */
+ err = rtrs_iu_post_recv(&con->c, rx_iu);
+ if (unlikely(err)) {
+ rtrs_err(s, "rtrs_iu_post_recv(), err: %d\n", err);
+ rtrs_iu_free(rx_iu, DMA_FROM_DEVICE, sess->s.dev->ib_dev, 1);
+ return err;
+ }
+
+ return 0;
+}
+
+static int post_recv_io(struct rtrs_srv_con *con, size_t q_size)
+{
+ int i, err;
+
+ for (i = 0; i < q_size; i++) {
+ err = rtrs_post_recv_empty(&con->c, &io_comp_cqe);
+ if (unlikely(err))
+ return err;
+ }
+
+ return 0;
+}
+
+static int post_recv_sess(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_sess *s = &sess->s;
+ size_t q_size;
+ int err, cid;
+
+ for (cid = 0; cid < sess->s.con_num; cid++) {
+ if (cid == 0)
+ q_size = SERVICE_CON_QUEUE_DEPTH;
+ else
+ q_size = srv->queue_depth;
+
+ err = post_recv_io(to_srv_con(sess->s.con[cid]), q_size);
+ if (unlikely(err)) {
+ rtrs_err(s, "post_recv_io(), err: %d\n", err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static void process_read(struct rtrs_srv_con *con,
+ struct rtrs_msg_rdma_read *msg,
+ u32 buf_id, u32 off)
+{
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_srv_ctx *ctx = srv->ctx;
+ struct rtrs_srv_op *id;
+
+ size_t usr_len, data_len;
+ void *data;
+ int ret;
+
+ if (unlikely(sess->state != RTRS_SRV_CONNECTED)) {
+ rtrs_err_rl(s,
+ "Processing read request failed, session is disconnected, sess state %s\n",
+ rtrs_srv_state_str(sess->state));
+ return;
+ }
+ if (unlikely(msg->sg_cnt != 1 && msg->sg_cnt != 0)) {
+ rtrs_err_rl(s,
+ "Processing read request failed, invalid message\n");
+ return;
+ }
+ rtrs_srv_get_ops_ids(sess);
+ rtrs_srv_update_rdma_stats(sess->stats, off, READ);
+ id = sess->ops_ids[buf_id];
+ id->con = con;
+ id->dir = READ;
+ id->msg_id = buf_id;
+ id->rd_msg = msg;
+ usr_len = le16_to_cpu(msg->usr_len);
+ data_len = off - usr_len;
+ data = page_address(srv->chunks[buf_id]);
+ ret = ctx->ops.rdma_ev(srv, srv->priv, id, READ, data, data_len,
+ data + data_len, usr_len);
+
+ if (unlikely(ret)) {
+ rtrs_err_rl(s,
+ "Processing read request failed, user module cb reported for msg_id %d, err: %d\n",
+ buf_id, ret);
+ goto send_err_msg;
+ }
+
+ return;
+
+send_err_msg:
+ ret = send_io_resp_imm(con, id, ret);
+ if (ret < 0) {
+ rtrs_err_rl(s,
+ "Sending err msg for failed RDMA-Write-Req failed, msg_id %d, err: %d\n",
+ buf_id, ret);
+ close_sess(sess);
+ }
+ rtrs_srv_put_ops_ids(sess);
+}
+
+static void process_write(struct rtrs_srv_con *con,
+ struct rtrs_msg_rdma_write *req,
+ u32 buf_id, u32 off)
+{
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_srv_ctx *ctx = srv->ctx;
+ struct rtrs_srv_op *id;
+
+ size_t data_len, usr_len;
+ void *data;
+ int ret;
+
+ if (unlikely(sess->state != RTRS_SRV_CONNECTED)) {
+ rtrs_err_rl(s,
+ "Processing write request failed, session is disconnected, sess state %s\n",
+ rtrs_srv_state_str(sess->state));
+ return;
+ }
+ rtrs_srv_get_ops_ids(sess);
+ rtrs_srv_update_rdma_stats(sess->stats, off, WRITE);
+ id = sess->ops_ids[buf_id];
+ id->con = con;
+ id->dir = WRITE;
+ id->msg_id = buf_id;
+
+ usr_len = le16_to_cpu(req->usr_len);
+ data_len = off - usr_len;
+ data = page_address(srv->chunks[buf_id]);
+ ret = ctx->ops.rdma_ev(srv, srv->priv, id, WRITE, data, data_len,
+ data + data_len, usr_len);
+ if (unlikely(ret)) {
+ rtrs_err_rl(s,
+ "Processing write request failed, user module callback reports err: %d\n",
+ ret);
+ goto send_err_msg;
+ }
+
+ return;
+
+send_err_msg:
+ ret = send_io_resp_imm(con, id, ret);
+ if (ret < 0) {
+ rtrs_err_rl(s,
+ "Processing write request failed, sending I/O response failed, msg_id %d, err: %d\n",
+ buf_id, ret);
+ close_sess(sess);
+ }
+ rtrs_srv_put_ops_ids(sess);
+}
+
+static void process_io_req(struct rtrs_srv_con *con, void *msg,
+ u32 id, u32 off)
+{
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct rtrs_msg_rdma_hdr *hdr;
+ unsigned int type;
+
+ ib_dma_sync_single_for_cpu(sess->s.dev->ib_dev, sess->dma_addr[id],
+ max_chunk_size, DMA_BIDIRECTIONAL);
+ hdr = msg;
+ type = le16_to_cpu(hdr->type);
+
+ switch (type) {
+ case RTRS_MSG_WRITE:
+ process_write(con, msg, id, off);
+ break;
+ case RTRS_MSG_READ:
+ process_read(con, msg, id, off);
+ break;
+ default:
+ rtrs_err(s,
+ "Processing I/O request failed, unknown message type received: 0x%02x\n",
+ type);
+ goto err;
+ }
+
+ return;
+
+err:
+ close_sess(sess);
+}
+
+static void rtrs_srv_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct rtrs_srv_mr *mr =
+ container_of(wc->wr_cqe, typeof(*mr), inv_cqe);
+ struct rtrs_srv_con *con = cq->cq_context;
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct rtrs_srv *srv = sess->srv;
+ u32 msg_id, off;
+ void *data;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ rtrs_err(s, "Failed IB_WR_LOCAL_INV: %s\n",
+ ib_wc_status_msg(wc->status));
+ close_sess(sess);
+ }
+ msg_id = mr->msg_id;
+ off = mr->msg_off;
+ data = page_address(srv->chunks[msg_id]) + off;
+ process_io_req(con, data, msg_id, off);
+}
+
+static int rtrs_srv_inv_rkey(struct rtrs_srv_con *con,
+ struct rtrs_srv_mr *mr)
+{
+ struct ib_send_wr wr = {
+ .opcode = IB_WR_LOCAL_INV,
+ .wr_cqe = &mr->inv_cqe,
+ .send_flags = IB_SEND_SIGNALED,
+ .ex.invalidate_rkey = mr->mr->rkey,
+ };
+ mr->inv_cqe.done = rtrs_srv_inv_rkey_done;
+
+ return ib_post_send(con->c.qp, &wr, NULL);
+}
+
+static void rtrs_rdma_process_wr_wait_list(struct rtrs_srv_con *con)
+{
+ spin_lock(&con->rsp_wr_wait_lock);
+ while (!list_empty(&con->rsp_wr_wait_list)) {
+ struct rtrs_srv_op *id;
+ int ret;
+
+ id = list_entry(con->rsp_wr_wait_list.next,
+ struct rtrs_srv_op, wait_list);
+ list_del(&id->wait_list);
+
+ spin_unlock(&con->rsp_wr_wait_lock);
+ ret = rtrs_srv_resp_rdma(id, id->status);
+ spin_lock(&con->rsp_wr_wait_lock);
+
+ if (!ret) {
+ list_add(&id->wait_list, &con->rsp_wr_wait_list);
+ break;
+ }
+ }
+ spin_unlock(&con->rsp_wr_wait_lock);
+}
+
+static void rtrs_srv_rdma_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct rtrs_srv_con *con = cq->cq_context;
+ struct rtrs_sess *s = con->c.sess;
+ struct rtrs_srv_sess *sess = to_srv_sess(s);
+ struct rtrs_srv *srv = sess->srv;
+ u32 imm_type, imm_payload;
+ int err;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ if (wc->status != IB_WC_WR_FLUSH_ERR) {
+ rtrs_err(s,
+ "%s (wr_cqe: %p, type: %d, vendor_err: 0x%x, len: %u)\n",
+ ib_wc_status_msg(wc->status), wc->wr_cqe,
+ wc->opcode, wc->vendor_err, wc->byte_len);
+ close_sess(sess);
+ }
+ return;
+ }
+
+ switch (wc->opcode) {
+ case IB_WC_RECV_RDMA_WITH_IMM:
+ /*
+ * post_recv() RDMA write completions of IO reqs (read/write)
+ * and hb
+ */
+ if (WARN_ON(wc->wr_cqe != &io_comp_cqe))
+ return;
+ err = rtrs_post_recv_empty(&con->c, &io_comp_cqe);
+ if (unlikely(err)) {
+ rtrs_err(s, "rtrs_post_recv(), err: %d\n", err);
+ close_sess(sess);
+ break;
+ }
+ rtrs_from_imm(be32_to_cpu(wc->ex.imm_data),
+ &imm_type, &imm_payload);
+ if (likely(imm_type == RTRS_IO_REQ_IMM)) {
+ u32 msg_id, off;
+ void *data;
+
+ msg_id = imm_payload >> sess->mem_bits;
+ off = imm_payload & ((1 << sess->mem_bits) - 1);
+ if (unlikely(msg_id > srv->queue_depth ||
+ off > max_chunk_size)) {
+ rtrs_err(s, "Wrong msg_id %u, off %u\n",
+ msg_id, off);
+ close_sess(sess);
+ return;
+ }
+ if (always_invalidate) {
+ struct rtrs_srv_mr *mr = &sess->mrs[msg_id];
+
+ mr->msg_off = off;
+ mr->msg_id = msg_id;
+ err = rtrs_srv_inv_rkey(con, mr);
+ if (unlikely(err)) {
+ rtrs_err(s, "rtrs_post_recv(), err: %d\n",
+ err);
+ close_sess(sess);
+ break;
+ }
+ } else {
+ data = page_address(srv->chunks[msg_id]) + off;
+ process_io_req(con, data, msg_id, off);
+ }
+ } else if (imm_type == RTRS_HB_MSG_IMM) {
+ WARN_ON(con->c.cid);
+ rtrs_send_hb_ack(&sess->s);
+ } else if (imm_type == RTRS_HB_ACK_IMM) {
+ WARN_ON(con->c.cid);
+ sess->s.hb_missed_cnt = 0;
+ } else {
+ rtrs_wrn(s, "Unknown IMM type %u\n", imm_type);
+ }
+ break;
+ case IB_WC_RDMA_WRITE:
+ case IB_WC_SEND:
+ /*
+ * post_send() RDMA write completions of IO reqs (read/write)
+ * and hb
+ */
+ atomic_add(srv->queue_depth, &con->sq_wr_avail);
+
+ if (unlikely(!list_empty_careful(&con->rsp_wr_wait_list)))
+ rtrs_rdma_process_wr_wait_list(con);
+
+ break;
+ default:
+ rtrs_wrn(s, "Unexpected WC type: %d\n", wc->opcode);
+ return;
+ }
+}
+
+/**
+ * rtrs_srv_get_sess_name() - Get rtrs_srv peer hostname.
+ * @srv: Session
+ * @sessname: Sessname buffer
+ * @len: Length of sessname buffer
+ */
+int rtrs_srv_get_sess_name(struct rtrs_srv *srv, char *sessname, size_t len)
+{
+ struct rtrs_srv_sess *sess;
+ int err = -ENOTCONN;
+
+ mutex_lock(&srv->paths_mutex);
+ list_for_each_entry(sess, &srv->paths_list, s.entry) {
+ if (sess->state != RTRS_SRV_CONNECTED)
+ continue;
+ strlcpy(sessname, sess->s.sessname,
+ min_t(size_t, sizeof(sess->s.sessname), len));
+ err = 0;
+ break;
+ }
+ mutex_unlock(&srv->paths_mutex);
+
+ return err;
+}
+EXPORT_SYMBOL(rtrs_srv_get_sess_name);
+
+/**
+ * rtrs_srv_get_sess_qdepth() - Get rtrs_srv qdepth.
+ * @srv: Session
+ */
+int rtrs_srv_get_queue_depth(struct rtrs_srv *srv)
+{
+ return srv->queue_depth;
+}
+EXPORT_SYMBOL(rtrs_srv_get_queue_depth);
+
+static int find_next_bit_ring(struct rtrs_srv_sess *sess)
+{
+ struct ib_device *ib_dev = sess->s.dev->ib_dev;
+ int v;
+
+ v = cpumask_next(sess->cur_cq_vector, &cq_affinity_mask);
+ if (v >= nr_cpu_ids || v >= ib_dev->num_comp_vectors)
+ v = cpumask_first(&cq_affinity_mask);
+ return v;
+}
+
+static int rtrs_srv_get_next_cq_vector(struct rtrs_srv_sess *sess)
+{
+ sess->cur_cq_vector = find_next_bit_ring(sess);
+
+ return sess->cur_cq_vector;
+}
+
+static struct rtrs_srv *__alloc_srv(struct rtrs_srv_ctx *ctx,
+ const uuid_t *paths_uuid)
+{
+ struct rtrs_srv *srv;
+ int i;
+
+ srv = kzalloc(sizeof(*srv), GFP_KERNEL);
+ if (!srv)
+ return NULL;
+
+ refcount_set(&srv->refcount, 1);
+ INIT_LIST_HEAD(&srv->paths_list);
+ mutex_init(&srv->paths_mutex);
+ mutex_init(&srv->paths_ev_mutex);
+ uuid_copy(&srv->paths_uuid, paths_uuid);
+ srv->queue_depth = sess_queue_depth;
+ srv->ctx = ctx;
+
+ srv->chunks = kcalloc(srv->queue_depth, sizeof(*srv->chunks),
+ GFP_KERNEL);
+ if (!srv->chunks)
+ goto err_free_srv;
+
+ for (i = 0; i < srv->queue_depth; i++) {
+ srv->chunks[i] = mempool_alloc(chunk_pool, GFP_KERNEL);
+ if (!srv->chunks[i])
+ goto err_free_chunks;
+ }
+ list_add(&srv->ctx_list, &ctx->srv_list);
+
+ return srv;
+
+err_free_chunks:
+ while (i--)
+ mempool_free(srv->chunks[i], chunk_pool);
+ kfree(srv->chunks);
+
+err_free_srv:
+ kfree(srv);
+
+ return NULL;
+}
+
+static void free_srv(struct rtrs_srv *srv)
+{
+ int i;
+
+ WARN_ON(refcount_read(&srv->refcount));
+ for (i = 0; i < srv->queue_depth; i++)
+ mempool_free(srv->chunks[i], chunk_pool);
+ kfree(srv->chunks);
+ mutex_destroy(&srv->paths_mutex);
+ mutex_destroy(&srv->paths_ev_mutex);
+ /* last put to release the srv structure */
+ put_device(&srv->dev);
+}
+
+static inline struct rtrs_srv *__find_srv_and_get(struct rtrs_srv_ctx *ctx,
+ const uuid_t *paths_uuid)
+{
+ struct rtrs_srv *srv;
+
+ list_for_each_entry(srv, &ctx->srv_list, ctx_list) {
+ if (uuid_equal(&srv->paths_uuid, paths_uuid) &&
+ refcount_inc_not_zero(&srv->refcount))
+ return srv;
+ }
+
+ return NULL;
+}
+
+static struct rtrs_srv *get_or_create_srv(struct rtrs_srv_ctx *ctx,
+ const uuid_t *paths_uuid)
+{
+ struct rtrs_srv *srv;
+
+ mutex_lock(&ctx->srv_mutex);
+ srv = __find_srv_and_get(ctx, paths_uuid);
+ if (!srv)
+ srv = __alloc_srv(ctx, paths_uuid);
+ mutex_unlock(&ctx->srv_mutex);
+
+ return srv;
+}
+
+static void put_srv(struct rtrs_srv *srv)
+{
+ if (refcount_dec_and_test(&srv->refcount)) {
+ struct rtrs_srv_ctx *ctx = srv->ctx;
+
+ WARN_ON(srv->dev.kobj.state_in_sysfs);
+
+ mutex_lock(&ctx->srv_mutex);
+ list_del(&srv->ctx_list);
+ mutex_unlock(&ctx->srv_mutex);
+ free_srv(srv);
+ }
+}
+
+static void __add_path_to_srv(struct rtrs_srv *srv,
+ struct rtrs_srv_sess *sess)
+{
+ list_add_tail(&sess->s.entry, &srv->paths_list);
+ srv->paths_num++;
+ WARN_ON(srv->paths_num >= MAX_PATHS_NUM);
+}
+
+static void del_path_from_srv(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+
+ if (WARN_ON(!srv))
+ return;
+
+ mutex_lock(&srv->paths_mutex);
+ list_del(&sess->s.entry);
+ WARN_ON(!srv->paths_num);
+ srv->paths_num--;
+ mutex_unlock(&srv->paths_mutex);
+}
+
+/* return true if addresses are the same, error other wise */
+static int sockaddr_cmp(const struct sockaddr *a, const struct sockaddr *b)
+{
+ switch (a->sa_family) {
+ case AF_IB:
+ return memcmp(&((struct sockaddr_ib *)a)->sib_addr,
+ &((struct sockaddr_ib *)b)->sib_addr,
+ sizeof(struct ib_addr)) &&
+ (b->sa_family == AF_IB);
+ fallthrough;
+ case AF_INET:
+ return memcmp(&((struct sockaddr_in *)a)->sin_addr,
+ &((struct sockaddr_in *)b)->sin_addr,
+ sizeof(struct in_addr)) &&
+ (b->sa_family == AF_INET);
+ fallthrough;
+ case AF_INET6:
+ return memcmp(&((struct sockaddr_in6 *)a)->sin6_addr,
+ &((struct sockaddr_in6 *)b)->sin6_addr,
+ sizeof(struct in6_addr)) &&
+ (b->sa_family == AF_INET6);
+ fallthrough;
+ default:
+ return -ENOENT;
+ }
+}
+
+static bool __is_path_w_addr_exists(struct rtrs_srv *srv,
+ struct rdma_addr *addr)
+{
+ struct rtrs_srv_sess *sess;
+
+ list_for_each_entry(sess, &srv->paths_list, s.entry)
+ if (!sockaddr_cmp((struct sockaddr *)&sess->s.dst_addr,
+ (struct sockaddr *)&addr->dst_addr) &&
+ !sockaddr_cmp((struct sockaddr *)&sess->s.src_addr,
+ (struct sockaddr *)&addr->src_addr))
+ return true;
+
+ return false;
+}
+
+static void free_sess(struct rtrs_srv_sess *sess)
+{
+ if (sess->kobj.state_in_sysfs)
+ kobject_put(&sess->kobj);
+ else
+ kfree(sess);
+}
+
+static void rtrs_srv_close_work(struct work_struct *work)
+{
+ struct rtrs_srv_sess *sess;
+ struct rtrs_srv_con *con;
+ int i;
+
+ sess = container_of(work, typeof(*sess), close_work);
+
+ rtrs_srv_destroy_sess_files(sess);
+ rtrs_srv_stop_hb(sess);
+
+ for (i = 0; i < sess->s.con_num; i++) {
+ if (!sess->s.con[i])
+ continue;
+ con = to_srv_con(sess->s.con[i]);
+ rdma_disconnect(con->c.cm_id);
+ ib_drain_qp(con->c.qp);
+ }
+ /* Wait for all inflights */
+ rtrs_srv_wait_ops_ids(sess);
+
+ /* Notify upper layer if we are the last path */
+ rtrs_srv_sess_down(sess);
+
+ unmap_cont_bufs(sess);
+ rtrs_srv_free_ops_ids(sess);
+
+ for (i = 0; i < sess->s.con_num; i++) {
+ if (!sess->s.con[i])
+ continue;
+ con = to_srv_con(sess->s.con[i]);
+ rtrs_cq_qp_destroy(&con->c);
+ rdma_destroy_id(con->c.cm_id);
+ kfree(con);
+ }
+ rtrs_ib_dev_put(sess->s.dev);
+
+ del_path_from_srv(sess);
+ put_srv(sess->srv);
+ sess->srv = NULL;
+ rtrs_srv_change_state(sess, RTRS_SRV_CLOSED);
+
+ kfree(sess->dma_addr);
+ kfree(sess->s.con);
+ free_sess(sess);
+}
+
+static int rtrs_rdma_do_accept(struct rtrs_srv_sess *sess,
+ struct rdma_cm_id *cm_id)
+{
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_msg_conn_rsp msg;
+ struct rdma_conn_param param;
+ int err;
+
+ param = (struct rdma_conn_param) {
+ .rnr_retry_count = 7,
+ .private_data = &msg,
+ .private_data_len = sizeof(msg),
+ };
+
+ msg = (struct rtrs_msg_conn_rsp) {
+ .magic = cpu_to_le16(RTRS_MAGIC),
+ .version = cpu_to_le16(RTRS_PROTO_VER),
+ .queue_depth = cpu_to_le16(srv->queue_depth),
+ .max_io_size = cpu_to_le32(max_chunk_size - MAX_HDR_SIZE),
+ .max_hdr_size = cpu_to_le32(MAX_HDR_SIZE),
+ };
+
+ if (always_invalidate)
+ msg.flags = cpu_to_le32(RTRS_MSG_NEW_RKEY_F);
+
+ err = rdma_accept(cm_id, ¶m);
+ if (err)
+ pr_err("rdma_accept(), err: %d\n", err);
+
+ return err;
+}
+
+static int rtrs_rdma_do_reject(struct rdma_cm_id *cm_id, int errno)
+{
+ struct rtrs_msg_conn_rsp msg;
+ int err;
+
+ msg = (struct rtrs_msg_conn_rsp) {
+ .magic = cpu_to_le16(RTRS_MAGIC),
+ .version = cpu_to_le16(RTRS_PROTO_VER),
+ .errno = cpu_to_le16(errno),
+ };
+
+ err = rdma_reject(cm_id, &msg, sizeof(msg));
+ if (err)
+ pr_err("rdma_reject(), err: %d\n", err);
+
+ /* Bounce errno back */
+ return errno;
+}
+
+static struct rtrs_srv_sess *
+__find_sess(struct rtrs_srv *srv, const uuid_t *sess_uuid)
+{
+ struct rtrs_srv_sess *sess;
+
+ list_for_each_entry(sess, &srv->paths_list, s.entry) {
+ if (uuid_equal(&sess->s.uuid, sess_uuid))
+ return sess;
+ }
+
+ return NULL;
+}
+
+static int create_con(struct rtrs_srv_sess *sess,
+ struct rdma_cm_id *cm_id,
+ unsigned int cid)
+{
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_sess *s = &sess->s;
+ struct rtrs_srv_con *con;
+
+ u16 cq_size, wr_queue_size;
+ int err, cq_vector;
+
+ con = kzalloc(sizeof(*con), GFP_KERNEL);
+ if (!con) {
+ err = -ENOMEM;
+ goto err;
+ }
+
+ spin_lock_init(&con->rsp_wr_wait_lock);
+ INIT_LIST_HEAD(&con->rsp_wr_wait_list);
+ con->c.cm_id = cm_id;
+ con->c.sess = &sess->s;
+ con->c.cid = cid;
+ atomic_set(&con->wr_cnt, 0);
+
+ if (con->c.cid == 0) {
+ /*
+ * All receive and all send (each requiring invalidate)
+ * + 2 for drain and heartbeat
+ */
+ wr_queue_size = SERVICE_CON_QUEUE_DEPTH * 3 + 2;
+ cq_size = wr_queue_size;
+ } else {
+ /*
+ * If we have all receive requests posted and
+ * all write requests posted and each read request
+ * requires an invalidate request + drain
+ * and qp gets into error state.
+ */
+ cq_size = srv->queue_depth * 3 + 1;
+ /*
+ * In theory we might have queue_depth * 32
+ * outstanding requests if an unsafe global key is used
+ * and we have queue_depth read requests each consisting
+ * of 32 different addresses. div 3 for mlx5.
+ */
+ wr_queue_size = sess->s.dev->ib_dev->attrs.max_qp_wr / 3;
+ }
+ atomic_set(&con->sq_wr_avail, wr_queue_size);
+ cq_vector = rtrs_srv_get_next_cq_vector(sess);
+
+ /* TODO: SOFTIRQ can be faster, but be careful with softirq context */
+ err = rtrs_cq_qp_create(&sess->s, &con->c, 1, cq_vector, cq_size,
+ wr_queue_size, IB_POLL_WORKQUEUE);
+ if (err) {
+ rtrs_err(s, "rtrs_cq_qp_create(), err: %d\n", err);
+ goto free_con;
+ }
+ if (con->c.cid == 0) {
+ err = post_recv_info_req(con);
+ if (err)
+ goto free_cqqp;
+ }
+ WARN_ON(sess->s.con[cid]);
+ sess->s.con[cid] = &con->c;
+
+ /*
+ * Change context from server to current connection. The other
+ * way is to use cm_id->qp->qp_context, which does not work on OFED.
+ */
+ cm_id->context = &con->c;
+
+ return 0;
+
+free_cqqp:
+ rtrs_cq_qp_destroy(&con->c);
+free_con:
+ kfree(con);
+
+err:
+ return err;
+}
+
+static struct rtrs_srv_sess *__alloc_sess(struct rtrs_srv *srv,
+ struct rdma_cm_id *cm_id,
+ unsigned int con_num,
+ unsigned int recon_cnt,
+ const uuid_t *uuid)
+{
+ struct rtrs_srv_sess *sess;
+ int err = -ENOMEM;
+
+ if (srv->paths_num >= MAX_PATHS_NUM) {
+ err = -ECONNRESET;
+ goto err;
+ }
+ if (__is_path_w_addr_exists(srv, &cm_id->route.addr)) {
+ err = -EEXIST;
+ pr_err("Path with same addr exists\n");
+ goto err;
+ }
+ sess = kzalloc(sizeof(*sess), GFP_KERNEL);
+ if (!sess)
+ goto err;
+
+ sess->stats = kzalloc(sizeof(*sess->stats), GFP_KERNEL);
+ if (!sess->stats)
+ goto err_free_sess;
+
+ sess->stats->sess = sess;
+
+ sess->dma_addr = kcalloc(srv->queue_depth, sizeof(*sess->dma_addr),
+ GFP_KERNEL);
+ if (!sess->dma_addr)
+ goto err_free_stats;
+
+ sess->s.con = kcalloc(con_num, sizeof(*sess->s.con), GFP_KERNEL);
+ if (!sess->s.con)
+ goto err_free_dma_addr;
+
+ sess->state = RTRS_SRV_CONNECTING;
+ sess->srv = srv;
+ sess->cur_cq_vector = -1;
+ sess->s.dst_addr = cm_id->route.addr.dst_addr;
+ sess->s.src_addr = cm_id->route.addr.src_addr;
+ sess->s.con_num = con_num;
+ sess->s.recon_cnt = recon_cnt;
+ uuid_copy(&sess->s.uuid, uuid);
+ spin_lock_init(&sess->state_lock);
+ INIT_WORK(&sess->close_work, rtrs_srv_close_work);
+ rtrs_srv_init_hb(sess);
+
+ sess->s.dev = rtrs_ib_dev_find_or_add(cm_id->device, &dev_pd);
+ if (!sess->s.dev) {
+ err = -ENOMEM;
+ goto err_free_con;
+ }
+ err = map_cont_bufs(sess);
+ if (err)
+ goto err_put_dev;
+
+ err = rtrs_srv_alloc_ops_ids(sess);
+ if (err)
+ goto err_unmap_bufs;
+
+ __add_path_to_srv(srv, sess);
+
+ return sess;
+
+err_unmap_bufs:
+ unmap_cont_bufs(sess);
+err_put_dev:
+ rtrs_ib_dev_put(sess->s.dev);
+err_free_con:
+ kfree(sess->s.con);
+err_free_dma_addr:
+ kfree(sess->dma_addr);
+err_free_stats:
+ kfree(sess->stats);
+err_free_sess:
+ kfree(sess);
+err:
+ return ERR_PTR(err);
+}
+
+static int rtrs_rdma_connect(struct rdma_cm_id *cm_id,
+ const struct rtrs_msg_conn_req *msg,
+ size_t len)
+{
+ struct rtrs_srv_ctx *ctx = cm_id->context;
+ struct rtrs_srv_sess *sess;
+ struct rtrs_srv *srv;
+
+ u16 version, con_num, cid;
+ u16 recon_cnt;
+ int err;
+
+ if (len < sizeof(*msg)) {
+ pr_err("Invalid RTRS connection request\n");
+ goto reject_w_econnreset;
+ }
+ if (le16_to_cpu(msg->magic) != RTRS_MAGIC) {
+ pr_err("Invalid RTRS magic\n");
+ goto reject_w_econnreset;
+ }
+ version = le16_to_cpu(msg->version);
+ if (version >> 8 != RTRS_PROTO_VER_MAJOR) {
+ pr_err("Unsupported major RTRS version: %d, expected %d\n",
+ version >> 8, RTRS_PROTO_VER_MAJOR);
+ goto reject_w_econnreset;
+ }
+ con_num = le16_to_cpu(msg->cid_num);
+ if (con_num > 4096) {
+ /* Sanity check */
+ pr_err("Too many connections requested: %d\n", con_num);
+ goto reject_w_econnreset;
+ }
+ cid = le16_to_cpu(msg->cid);
+ if (cid >= con_num) {
+ /* Sanity check */
+ pr_err("Incorrect cid: %d >= %d\n", cid, con_num);
+ goto reject_w_econnreset;
+ }
+ recon_cnt = le16_to_cpu(msg->recon_cnt);
+ srv = get_or_create_srv(ctx, &msg->paths_uuid);
+ if (!srv) {
+ err = -ENOMEM;
+ goto reject_w_err;
+ }
+ mutex_lock(&srv->paths_mutex);
+ sess = __find_sess(srv, &msg->sess_uuid);
+ if (sess) {
+ struct rtrs_sess *s = &sess->s;
+
+ /* Session already holds a reference */
+ put_srv(srv);
+
+ if (sess->state != RTRS_SRV_CONNECTING) {
+ rtrs_err(s, "Session in wrong state: %s\n",
+ rtrs_srv_state_str(sess->state));
+ mutex_unlock(&srv->paths_mutex);
+ goto reject_w_econnreset;
+ }
+ /*
+ * Sanity checks
+ */
+ if (con_num != sess->s.con_num || cid >= sess->s.con_num) {
+ rtrs_err(s, "Incorrect request: %d, %d\n",
+ cid, con_num);
+ mutex_unlock(&srv->paths_mutex);
+ goto reject_w_econnreset;
+ }
+ if (sess->s.con[cid]) {
+ rtrs_err(s, "Connection already exists: %d\n",
+ cid);
+ mutex_unlock(&srv->paths_mutex);
+ goto reject_w_econnreset;
+ }
+ } else {
+ sess = __alloc_sess(srv, cm_id, con_num, recon_cnt,
+ &msg->sess_uuid);
+ if (IS_ERR(sess)) {
+ mutex_unlock(&srv->paths_mutex);
+ put_srv(srv);
+ err = PTR_ERR(sess);
+ goto reject_w_err;
+ }
+ }
+ err = create_con(sess, cm_id, cid);
+ if (err) {
+ (void)rtrs_rdma_do_reject(cm_id, err);
+ /*
+ * Since session has other connections we follow normal way
+ * through workqueue, but still return an error to tell cma.c
+ * to call rdma_destroy_id() for current connection.
+ */
+ goto close_and_return_err;
+ }
+ err = rtrs_rdma_do_accept(sess, cm_id);
+ if (err) {
+ (void)rtrs_rdma_do_reject(cm_id, err);
+ /*
+ * Since current connection was successfully added to the
+ * session we follow normal way through workqueue to close the
+ * session, thus return 0 to tell cma.c we call
+ * rdma_destroy_id() ourselves.
+ */
+ err = 0;
+ goto close_and_return_err;
+ }
+ mutex_unlock(&srv->paths_mutex);
+
+ return 0;
+
+reject_w_err:
+ return rtrs_rdma_do_reject(cm_id, err);
+
+reject_w_econnreset:
+ return rtrs_rdma_do_reject(cm_id, -ECONNRESET);
+
+close_and_return_err:
+ close_sess(sess);
+ mutex_unlock(&srv->paths_mutex);
+
+ return err;
+}
+
+static int rtrs_srv_rdma_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *ev)
+{
+ struct rtrs_srv_sess *sess = NULL;
+ struct rtrs_sess *s = NULL;
+
+ if (ev->event != RDMA_CM_EVENT_CONNECT_REQUEST) {
+ struct rtrs_con *c = cm_id->context;
+
+ s = c->sess;
+ sess = to_srv_sess(s);
+ }
+
+ switch (ev->event) {
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ /*
+ * In case of error cma.c will destroy cm_id,
+ * see cma_process_remove()
+ */
+ return rtrs_rdma_connect(cm_id, ev->param.conn.private_data,
+ ev->param.conn.private_data_len);
+ case RDMA_CM_EVENT_ESTABLISHED:
+ /* Nothing here */
+ break;
+ case RDMA_CM_EVENT_REJECTED:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ case RDMA_CM_EVENT_UNREACHABLE:
+ rtrs_err(s, "CM error (CM event: %s, err: %d)\n",
+ rdma_event_msg(ev->event), ev->status);
+ close_sess(sess);
+ break;
+ case RDMA_CM_EVENT_DISCONNECTED:
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ close_sess(sess);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ close_sess(sess);
+ break;
+ default:
+ pr_err("Ignoring unexpected CM event %s, err %d\n",
+ rdma_event_msg(ev->event), ev->status);
+ break;
+ }
+
+ return 0;
+}
+
+static struct rdma_cm_id *rtrs_srv_cm_init(struct rtrs_srv_ctx *ctx,
+ struct sockaddr *addr,
+ enum rdma_ucm_port_space ps)
+{
+ struct rdma_cm_id *cm_id;
+ int ret;
+
+ cm_id = rdma_create_id(&init_net, rtrs_srv_rdma_cm_handler,
+ ctx, ps, IB_QPT_RC);
+ if (IS_ERR(cm_id)) {
+ ret = PTR_ERR(cm_id);
+ pr_err("Creating id for RDMA connection failed, err: %d\n",
+ ret);
+ goto err_out;
+ }
+ ret = rdma_bind_addr(cm_id, addr);
+ if (ret) {
+ pr_err("Binding RDMA address failed, err: %d\n", ret);
+ goto err_cm;
+ }
+ ret = rdma_listen(cm_id, 64);
+ if (ret) {
+ pr_err("Listening on RDMA connection failed, err: %d\n",
+ ret);
+ goto err_cm;
+ }
+
+ return cm_id;
+
+err_cm:
+ rdma_destroy_id(cm_id);
+err_out:
+
+ return ERR_PTR(ret);
+}
+
+static int rtrs_srv_rdma_init(struct rtrs_srv_ctx *ctx, u16 port)
+{
+ struct sockaddr_in6 sin = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6ADDR_ANY_INIT,
+ .sin6_port = htons(port),
+ };
+ struct sockaddr_ib sib = {
+ .sib_family = AF_IB,
+ .sib_sid = cpu_to_be64(RDMA_IB_IP_PS_IB | port),
+ .sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL),
+ .sib_pkey = cpu_to_be16(0xffff),
+ };
+ struct rdma_cm_id *cm_ip, *cm_ib;
+ int ret;
+
+ /*
+ * We accept both IPoIB and IB connections, so we need to keep
+ * two cm id's, one for each socket type and port space.
+ * If the cm initialization of one of the id's fails, we abort
+ * everything.
+ */
+ cm_ip = rtrs_srv_cm_init(ctx, (struct sockaddr *)&sin, RDMA_PS_TCP);
+ if (IS_ERR(cm_ip))
+ return PTR_ERR(cm_ip);
+
+ cm_ib = rtrs_srv_cm_init(ctx, (struct sockaddr *)&sib, RDMA_PS_IB);
+ if (IS_ERR(cm_ib)) {
+ ret = PTR_ERR(cm_ib);
+ goto free_cm_ip;
+ }
+
+ ctx->cm_id_ip = cm_ip;
+ ctx->cm_id_ib = cm_ib;
+
+ return 0;
+
+free_cm_ip:
+ rdma_destroy_id(cm_ip);
+
+ return ret;
+}
+
+static struct rtrs_srv_ctx *alloc_srv_ctx(struct rtrs_srv_ops *ops)
+{
+ struct rtrs_srv_ctx *ctx;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return NULL;
+
+ ctx->ops = *ops;
+ mutex_init(&ctx->srv_mutex);
+ INIT_LIST_HEAD(&ctx->srv_list);
+
+ return ctx;
+}
+
+static void free_srv_ctx(struct rtrs_srv_ctx *ctx)
+{
+ WARN_ON(!list_empty(&ctx->srv_list));
+ mutex_destroy(&ctx->srv_mutex);
+ kfree(ctx);
+}
+
+/**
+ * rtrs_srv_open() - open RTRS server context
+ * @ops: callback functions
+ * @port: port to listen on
+ *
+ * Creates server context with specified callbacks.
+ *
+ * Return a valid pointer on success otherwise PTR_ERR.
+ */
+struct rtrs_srv_ctx *rtrs_srv_open(struct rtrs_srv_ops *ops, u16 port)
+{
+ struct rtrs_srv_ctx *ctx;
+ int err;
+
+ ctx = alloc_srv_ctx(ops);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ err = rtrs_srv_rdma_init(ctx, port);
+ if (err) {
+ free_srv_ctx(ctx);
+ return ERR_PTR(err);
+ }
+
+ return ctx;
+}
+EXPORT_SYMBOL(rtrs_srv_open);
+
+static void close_sessions(struct rtrs_srv *srv)
+{
+ struct rtrs_srv_sess *sess;
+
+ mutex_lock(&srv->paths_mutex);
+ list_for_each_entry(sess, &srv->paths_list, s.entry)
+ close_sess(sess);
+ mutex_unlock(&srv->paths_mutex);
+}
+
+static void close_ctx(struct rtrs_srv_ctx *ctx)
+{
+ struct rtrs_srv *srv;
+
+ mutex_lock(&ctx->srv_mutex);
+ list_for_each_entry(srv, &ctx->srv_list, ctx_list)
+ close_sessions(srv);
+ mutex_unlock(&ctx->srv_mutex);
+ flush_workqueue(rtrs_wq);
+}
+
+/**
+ * rtrs_srv_close() - close RTRS server context
+ * @ctx: pointer to server context
+ *
+ * Closes RTRS server context with all client sessions.
+ */
+void rtrs_srv_close(struct rtrs_srv_ctx *ctx)
+{
+ rdma_destroy_id(ctx->cm_id_ip);
+ rdma_destroy_id(ctx->cm_id_ib);
+ close_ctx(ctx);
+ free_srv_ctx(ctx);
+}
+EXPORT_SYMBOL(rtrs_srv_close);
+
+static int check_module_params(void)
+{
+ if (sess_queue_depth < 1 || sess_queue_depth > MAX_SESS_QUEUE_DEPTH) {
+ pr_err("Invalid sess_queue_depth value %d, has to be >= %d, <= %d.\n",
+ sess_queue_depth, 1, MAX_SESS_QUEUE_DEPTH);
+ return -EINVAL;
+ }
+ if (max_chunk_size < 4096 || !is_power_of_2(max_chunk_size)) {
+ pr_err("Invalid max_chunk_size value %d, has to be >= %d and should be power of two.\n",
+ max_chunk_size, 4096);
+ return -EINVAL;
+ }
+
+ /*
+ * Check if IB immediate data size is enough to hold the mem_id and the
+ * offset inside the memory chunk
+ */
+ if ((ilog2(sess_queue_depth - 1) + 1) +
+ (ilog2(max_chunk_size - 1) + 1) > MAX_IMM_PAYL_BITS) {
+ pr_err("RDMA immediate size (%db) not enough to encode %d buffers of size %dB. Reduce 'sess_queue_depth' or 'max_chunk_size' parameters.\n",
+ MAX_IMM_PAYL_BITS, sess_queue_depth, max_chunk_size);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int __init rtrs_server_init(void)
+{
+ int err;
+
+ pr_info("Loading module %s, proto %s: (max_chunk_size: %d (pure IO %ld, headers %ld) , sess_queue_depth: %d, always_invalidate: %d)\n",
+ KBUILD_MODNAME, RTRS_PROTO_VER_STRING,
+ max_chunk_size, max_chunk_size - MAX_HDR_SIZE, MAX_HDR_SIZE,
+ sess_queue_depth, always_invalidate);
+
+ rtrs_rdma_dev_pd_init(0, &dev_pd);
+
+ err = check_module_params();
+ if (err) {
+ pr_err("Failed to load module, invalid module parameters, err: %d\n",
+ err);
+ return err;
+ }
+ chunk_pool = mempool_create_page_pool(sess_queue_depth * CHUNK_POOL_SZ,
+ get_order(max_chunk_size));
+ if (!chunk_pool)
+ return -ENOMEM;
+ rtrs_dev_class = class_create(THIS_MODULE, "rtrs-server");
+ if (IS_ERR(rtrs_dev_class)) {
+ err = PTR_ERR(rtrs_dev_class);
+ goto out_chunk_pool;
+ }
+ rtrs_wq = alloc_workqueue("rtrs_server_wq", WQ_MEM_RECLAIM, 0);
+ if (!rtrs_wq)
+ goto out_dev_class;
+
+ return 0;
+
+out_dev_class:
+ class_destroy(rtrs_dev_class);
+out_chunk_pool:
+ mempool_destroy(chunk_pool);
+
+ return err;
+}
+
+static void __exit rtrs_server_exit(void)
+{
+ destroy_workqueue(rtrs_wq);
+ class_destroy(rtrs_dev_class);
+ mempool_destroy(chunk_pool);
+ rtrs_rdma_dev_pd_deinit(&dev_pd);
+}
+
+module_init(rtrs_server_init);
+module_exit(rtrs_server_exit);