[PATCH 09/24] ibtrs: server: main functionality

Roman Pen
2018-02-02T14:08:49Z

This is main functionality of ibtrs-server module, which accepts
set of RDMA connections (so called IBTRS session), creates/destroys
sysfs entries associated with IBTRS session and notifies upper layer
(user of IBTRS API) about RDMA requests or link events.

Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
Signed-off-by: Danil Kipnis <danil.kipnis@profitbricks.com>
Cc: Jack Wang <jinpu.wang@profitbricks.com>
---
drivers/infiniband/ulp/ibtrs/ibtrs-srv.c | 1811 ++++++++++++++++++++++++++++++
1 file changed, 1811 insertions(+)

diff --git a/drivers/infiniband/ulp/ibtrs/ibtrs-srv.c b/drivers/infiniband/ulp/ibtrs/ibtrs-srv.c
new file mode 100644
index 000000000000..0d1fc08bd821
--- /dev/null
+++ b/drivers/infiniband/ulp/ibtrs/ibtrs-srv.c
@@ -0,0 +1,1811 @@
+/*
+ * InfiniBand Transport Layer
+ *
+ * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved.
+ * Authors: Fabian Holler <mail@fholler.de>
+ * Jack Wang <jinpu.wang@profitbricks.com>
+ * Kleber Souza <kleber.souza@profitbricks.com>
+ * Danil Kipnis <danil.kipnis@profitbricks.com>
+ * Roman Penyaev <roman.penyaev@profitbricks.com>
+ * Milind Dumbare <Milind.dumbare@gmail.com>
+ *
+ * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Authors: Danil Kipnis <danil.kipnis@profitbricks.com>
+ * Roman Penyaev <roman.penyaev@profitbricks.com>
+ *
+ * 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/mempool.h>
+
+#include "ibtrs-srv.h"
+#include "ibtrs-log.h"
+
+MODULE_AUTHOR("ibnbd@profitbricks.com");
+MODULE_DESCRIPTION("IBTRS Server");
+MODULE_VERSION(IBTRS_VER_STRING);
+MODULE_LICENSE("GPL");
+
+#define DEFAULT_MAX_IO_SIZE_KB 128
+#define DEFAULT_MAX_IO_SIZE (DEFAULT_MAX_IO_SIZE_KB * 1024)
+#define MAX_REQ_SIZE PAGE_SIZE
+#define MAX_SG_COUNT ((MAX_REQ_SIZE - sizeof(struct ibtrs_msg_rdma_read)) \
+ / sizeof(struct ibtrs_sg_desc))
+
+static int max_io_size = DEFAULT_MAX_IO_SIZE;
+static int rcv_buf_size = DEFAULT_MAX_IO_SIZE + MAX_REQ_SIZE;
+
+static int max_io_size_set(const char *val, const struct kernel_param *kp)
+{
+ int err, ival;
+
+ err = kstrtoint(val, 0, &ival);
+ if (err)
+ return err;
+
+ if (ival < 4096 || ival + MAX_REQ_SIZE > (4096 * 1024) ||
+ (ival + MAX_REQ_SIZE) % 512 != 0) {
+ pr_err("Invalid max io size value %d, has to be"
+ " > %d, < %d\n", ival, 4096, 4194304);
+ return -EINVAL;
+ }
+
+ max_io_size = ival;
+ rcv_buf_size = max_io_size + MAX_REQ_SIZE;
+ pr_info("max io size changed to %d\n", ival);
+
+ return 0;
+}
+
+static const struct kernel_param_ops max_io_size_ops = {
+ .set = max_io_size_set,
+ .get = param_get_int,
+};
+module_param_cb(max_io_size, &max_io_size_ops, &max_io_size, 0444);
+MODULE_PARM_DESC(max_io_size,
+ "Max size for each IO request, when change the unit is in byte"
+ " (default: " __stringify(DEFAULT_MAX_IO_SIZE_KB) "KB)");
+
+#define DEFAULT_SESS_QUEUE_DEPTH 512
+static int sess_queue_depth = DEFAULT_SESS_QUEUE_DEPTH;
+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) ")");
+
+/* We guarantee to serve 10 paths at least */
+#define CHUNK_POOL_SIZE (DEFAULT_SESS_QUEUE_DEPTH * 10)
+static mempool_t *chunk_pool;
+
+static int retry_count = 7;
+
+static int retry_count_set(const char *val, const struct kernel_param *kp)
+{
+ int err, ival;
+
+ err = kstrtoint(val, 0, &ival);
+ if (err)
+ return err;
+
+ if (ival < MIN_RTR_CNT || ival > MAX_RTR_CNT) {
+ pr_err("Invalid retry count value %d, has to be"
+ " > %d, < %d\n", ival, MIN_RTR_CNT, MAX_RTR_CNT);
+ return -EINVAL;
+ }
+
+ retry_count = ival;
+ pr_info("QP retry count changed to %d\n", ival);
+
+ return 0;
+}
+
+static const struct kernel_param_ops retry_count_ops = {
+ .set = retry_count_set,
+ .get = param_get_int,
+};
+module_param_cb(retry_count, &retry_count_ops, &retry_count, 0644);
+
+MODULE_PARM_DESC(retry_count, "Number of times to send the message if the"
+ " remote side didn't respond with Ack or Nack (default: 3,"
+ " min: " __stringify(MIN_RTR_CNT) ", max: "
+ __stringify(MAX_RTR_CNT) ")");
+
+static char cq_affinity_list[256] = "";
+static cpumask_t cq_affinity_mask = { CPU_BITS_ALL };
+
+static void init_cq_affinity(void)
+{
+ sprintf(cq_affinity_list, "0-%d", nr_cpu_ids - 1);
+}
+
+static int cq_affinity_list_set(const char *val, const struct kernel_param *kp)
+{
+ int ret = 0, len = strlen(val);
+ cpumask_var_t new_value;
+
+ if (!strlen(cq_affinity_list))
+ init_cq_affinity();
+
+ if (len >= sizeof(cq_affinity_list))
+ return -EINVAL;
+ if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
+ return -ENOMEM;
+
+ ret = cpulist_parse(val, new_value);
+ if (ret) {
+ pr_err("Can't set cq_affinity_list \"%s\": %d\n", val,
+ ret);
+ goto free_cpumask;
+ }
+
+ strlcpy(cq_affinity_list, val, sizeof(cq_affinity_list));
+ *strchrnul(cq_affinity_list, '\n') = '\0';
+ cpumask_copy(&cq_affinity_mask, new_value);
+
+ pr_info("cq_affinity_list changed to %*pbl\n",
+ cpumask_pr_args(&cq_affinity_mask));
+free_cpumask:
+ free_cpumask_var(new_value);
+ return ret;
+}
+
+static struct kparam_string cq_affinity_list_kparam_str = {
+ .maxlen = sizeof(cq_affinity_list),
+ .string = cq_affinity_list
+};
+
+static const struct kernel_param_ops cq_affinity_list_ops = {
+ .set = cq_affinity_list_set,
+ .get = param_get_string,
+};
+
+module_param_cb(cq_affinity_list, &cq_affinity_list_ops,
+ &cq_affinity_list_kparam_str, 0644);
+MODULE_PARM_DESC(cq_affinity_list, "Sets the list of cpus to use as cq vectors."
+ "(default: use all possible CPUs)");
+
+static struct workqueue_struct *ibtrs_wq;
+
+static void close_sess(struct ibtrs_srv_sess *sess);
+
+static inline struct ibtrs_srv_con *to_srv_con(struct ibtrs_con *c)
+{
+ if (unlikely(!c))
+ return NULL;
+
+ return container_of(c, struct ibtrs_srv_con, c);
+}
+
+static inline struct ibtrs_srv_sess *to_srv_sess(struct ibtrs_sess *s)
+{
+ if (unlikely(!s))
+ return NULL;
+
+ return container_of(s, struct ibtrs_srv_sess, s);
+}
+
+static bool __ibtrs_srv_change_state(struct ibtrs_srv_sess *sess,
+ enum ibtrs_srv_state new_state)
+{
+ enum ibtrs_srv_state old_state;
+ bool changed = false;
+
+ old_state = sess->state;
+ switch (new_state) {
+ case IBTRS_SRV_CONNECTED:
+ switch (old_state) {
+ case IBTRS_SRV_CONNECTING:
+ changed = true;
+ /* FALLTHRU */
+ default:
+ break;
+ }
+ break;
+ case IBTRS_SRV_CLOSING:
+ switch (old_state) {
+ case IBTRS_SRV_CONNECTING:
+ case IBTRS_SRV_CONNECTED:
+ changed = true;
+ /* FALLTHRU */
+ default:
+ break;
+ }
+ break;
+ case IBTRS_SRV_CLOSED:
+ switch (old_state) {
+ case IBTRS_SRV_CLOSING:
+ changed = true;
+ /* FALLTHRU */
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ if (changed)
+ sess->state = new_state;
+
+ return changed;
+}
+
+static bool ibtrs_srv_change_state_get_old(struct ibtrs_srv_sess *sess,
+ enum ibtrs_srv_state new_state,
+ enum ibtrs_srv_state *old_state)
+{
+ bool changed;
+
+ spin_lock_irq(&sess->state_lock);
+ *old_state = sess->state;
+ changed = __ibtrs_srv_change_state(sess, new_state);
+ spin_unlock_irq(&sess->state_lock);
+
+ return changed;
+}
+
+static bool ibtrs_srv_change_state(struct ibtrs_srv_sess *sess,
+ enum ibtrs_srv_state new_state)
+{
+ enum ibtrs_srv_state old_state;
+
+ return ibtrs_srv_change_state_get_old(sess, new_state, &old_state);
+}
+
+static void free_id(struct ibtrs_srv_op *id)
+{
+ if (!id)
+ return;
+ kfree(id->tx_wr);
+ kfree(id->tx_sg);
+ kfree(id);
+}
+
+static void ibtrs_srv_free_ops_ids(struct ibtrs_srv_sess *sess)
+{
+ struct ibtrs_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 int ibtrs_srv_alloc_ops_ids(struct ibtrs_srv_sess *sess)
+{
+ struct ibtrs_srv *srv = sess->srv;
+ struct ibtrs_srv_op *id;
+ int i;
+
+ sess->ops_ids = kcalloc(srv->queue_depth, sizeof(*sess->ops_ids),
+ GFP_KERNEL);
+ if (unlikely(!sess->ops_ids))
+ goto err;
+
+ for (i = 0; i < srv->queue_depth; ++i) {
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (unlikely(!id))
+ goto err;
+
+ sess->ops_ids[i] = id;
+ id->tx_wr = kcalloc(MAX_SG_COUNT, sizeof(*id->tx_wr),
+ GFP_KERNEL);
+ if (unlikely(!id->tx_wr))
+ goto err;
+
+ id->tx_sg = kcalloc(MAX_SG_COUNT, sizeof(*id->tx_sg),
+ GFP_KERNEL);
+ if (unlikely(!id->tx_sg))
+ goto err;
+ }
+ init_waitqueue_head(&sess->ids_waitq);
+ atomic_set(&sess->ids_inflight, 0);
+
+ return 0;
+
+err:
+ ibtrs_srv_free_ops_ids(sess);
+ return -ENOMEM;
+}
+
+static void ibtrs_srv_get_ops_ids(struct ibtrs_srv_sess *sess)
+{
+ atomic_inc(&sess->ids_inflight);
+}
+
+static void ibtrs_srv_put_ops_ids(struct ibtrs_srv_sess *sess)
+{
+ if (atomic_dec_and_test(&sess->ids_inflight))
+ wake_up(&sess->ids_waitq);
+}
+
+static void ibtrs_srv_wait_ops_ids(struct ibtrs_srv_sess *sess)
+{
+ wait_event(sess->ids_waitq, !atomic_read(&sess->ids_inflight));
+}
+
+static void ibtrs_srv_rdma_done(struct ib_cq *cq, struct ib_wc *wc);
+
+static struct ib_cqe io_comp_cqe = {
+ .done = ibtrs_srv_rdma_done
+};
+
+static int rdma_write_sg(struct ibtrs_srv_op *id)
+{
+ struct ibtrs_srv_sess *sess = to_srv_sess(id->con->c.sess);
+ struct ibtrs_srv *srv = sess->srv;
+ struct ib_rdma_wr *wr = NULL;
+ struct ib_send_wr *bad_wr;
+ enum ib_send_flags flags;
+ size_t sg_cnt;
+ int err, i, offset;
+
+ sg_cnt = le32_to_cpu(id->msg->sg_cnt);
+ if (unlikely(!sg_cnt))
+ return -EINVAL;
+
+ offset = 0;
+ for (i = 0; i < sg_cnt; i++) {
+ struct ib_sge *list;
+
+ wr = &id->tx_wr[i];
+ list = &id->tx_sg[i];
+ list->addr = id->data_dma_addr + offset;
+ list->length = le32_to_cpu(id->msg->desc[i].len);
+
+ /* WR will fail with length error
+ * if this is 0
+ */
+ if (unlikely(list->length == 0)) {
+ ibtrs_err(sess, "Invalid RDMA-Write sg list length 0\n");
+ return -EINVAL;
+ }
+
+ list->lkey = sess->s.ib_dev->lkey;
+ offset += list->length;
+
+ wr->wr.wr_cqe = &io_comp_cqe;
+ wr->wr.sg_list = list;
+ wr->wr.num_sge = 1;
+ wr->remote_addr = le64_to_cpu(id->msg->desc[i].addr);
+ wr->rkey = le32_to_cpu(id->msg->desc[i].key);
+
+ if (i < (sg_cnt - 1)) {
+ wr->wr.next = &id->tx_wr[i + 1].wr;
+ wr->wr.opcode = IB_WR_RDMA_WRITE;
+ wr->wr.ex.imm_data = 0;
+ wr->wr.send_flags = 0;
+ }
+ }
+ /*
+ * 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(&id->con->wr_cnt) % srv->queue_depth ?
+ 0 : IB_SEND_SIGNALED;
+
+ wr->wr.wr_cqe = &io_comp_cqe;
+ wr->wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM;
+ wr->wr.next = NULL;
+ wr->wr.send_flags = flags;
+ wr->wr.ex.imm_data = cpu_to_be32(ibtrs_to_io_rsp_imm(id->msg_id, 0));
+
+ err = ib_post_send(id->con->c.qp, &id->tx_wr[0].wr, &bad_wr);
+ if (unlikely(err))
+ ibtrs_err(sess,
+ "Posting RDMA-Write-Request to QP failed, err: %d\n",
+ err);
+
+ return err;
+}
+
+static int send_io_resp_imm(struct ibtrs_srv_con *con, int msg_id, s16 errno)
+{
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_srv *srv = sess->srv;
+ enum ib_send_flags flags;
+ u32 imm;
+ int err;
+
+ /*
+ * 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 = ibtrs_to_io_rsp_imm(msg_id, errno);
+ err = ibtrs_post_rdma_write_imm_empty(&con->c, &io_comp_cqe,
+ imm, flags);
+ if (unlikely(err))
+ ibtrs_err_rl(sess, "ib_post_send(), err: %d\n", err);
+
+ return err;
+}
+
+/*
+ * ibtrs_srv_resp_rdma() - sends response to the client.
+ *
+ * Context: any
+ */
+void ibtrs_srv_resp_rdma(struct ibtrs_srv_op *id, int status)
+{
+ struct ibtrs_srv_con *con = id->con;
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ int err;
+
+ if (WARN_ON(!id))
+ return;
+
+ if (unlikely(sess->state != IBTRS_SRV_CONNECTED)) {
+ ibtrs_err_rl(sess, "Sending I/O response failed, "
+ " session is disconnected, sess state %s\n",
+ ibtrs_srv_state_str(sess->state));
+ goto out;
+ }
+ if (status || id->dir == WRITE || !id->msg->sg_cnt)
+ err = send_io_resp_imm(con, id->msg_id, status);
+ else
+ err = rdma_write_sg(id);
+ if (unlikely(err)) {
+ ibtrs_err_rl(sess, "IO response failed: %d\n", err);
+ close_sess(sess);
+ }
+out:
+ ibtrs_srv_put_ops_ids(sess);
+}
+EXPORT_SYMBOL(ibtrs_srv_resp_rdma);
+
+void ibtrs_srv_set_sess_priv(struct ibtrs_srv *srv, void *priv)
+{
+ srv->priv = priv;
+}
+EXPORT_SYMBOL(ibtrs_srv_set_sess_priv);
+
+static void unmap_cont_bufs(struct ibtrs_srv_sess *sess)
+{
+ struct ibtrs_srv *srv = sess->srv;
+ int i;
+
+ for (i = 0; i < srv->queue_depth; i++)
+ ib_dma_unmap_page(sess->s.ib_dev->dev, sess->rdma_addr[i],
+ rcv_buf_size, DMA_BIDIRECTIONAL);
+}
+
+static int map_cont_bufs(struct ibtrs_srv_sess *sess)
+{
+ struct ibtrs_srv *srv = sess->srv;
+ unsigned int chunk_bits;
+ dma_addr_t addr;
+ int i, err;
+
+ for (i = 0; i < srv->queue_depth; i++) {
+ addr = ib_dma_map_page(sess->s.ib_dev->dev, srv->chunks[i],
+ 0, rcv_buf_size, DMA_BIDIRECTIONAL);
+ if (unlikely(ib_dma_mapping_error(sess->s.ib_dev->dev, addr))) {
+ ibtrs_err(sess, "ib_dma_map_page() failed\n");
+ err = -EIO;
+ goto err_map;
+ }
+ sess->rdma_addr[i] = addr;
+ }
+ chunk_bits = ilog2(srv->queue_depth - 1) + 1;
+ sess->mem_bits = (MAX_IMM_PAYL_BITS - chunk_bits);
+
+ return 0;
+
+err_map:
+ while (i--)
+ ib_dma_unmap_page(sess->s.ib_dev->dev, sess->rdma_addr[i],
+ rcv_buf_size, DMA_BIDIRECTIONAL);
+
+ return err;
+}
+
+static void ibtrs_srv_hb_err_handler(struct ibtrs_con *c, int err)
+{
+ (void)err;
+ close_sess(to_srv_sess(c->sess));
+}
+
+static void ibtrs_srv_init_hb(struct ibtrs_srv_sess *sess)
+{
+ ibtrs_init_hb(&sess->s, &io_comp_cqe,
+ IBTRS_HB_INTERVAL_MS,
+ IBTRS_HB_MISSED_MAX,
+ ibtrs_srv_hb_err_handler,
+ ibtrs_wq);
+}
+
+static void ibtrs_srv_start_hb(struct ibtrs_srv_sess *sess)
+{
+ ibtrs_start_hb(&sess->s);
+}
+
+static void ibtrs_srv_stop_hb(struct ibtrs_srv_sess *sess)
+{
+ ibtrs_stop_hb(&sess->s);
+}
+
+static void ibtrs_srv_info_rsp_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct ibtrs_srv_con *con = cq->cq_context;
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_iu *iu;
+
+ iu = container_of(wc->wr_cqe, struct ibtrs_iu, cqe);
+ ibtrs_iu_free(iu, DMA_TO_DEVICE, sess->s.ib_dev->dev);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ ibtrs_err(sess, "Sess info response send failed: %s\n",
+ ib_wc_status_msg(wc->status));
+ close_sess(sess);
+ return;
+ }
+ WARN_ON(wc->opcode != IB_WC_SEND);
+ ibtrs_srv_update_wc_stats(&sess->stats);
+}
+
+static void ibtrs_srv_sess_up(struct ibtrs_srv_sess *sess)
+{
+ struct ibtrs_srv *srv = sess->srv;
+ struct ibtrs_srv_ctx *ctx = srv->ctx;
+ int up;
+
+ mutex_lock(&srv->paths_ev_mutex);
+ up = ++srv->paths_up;
+ if (up == 1)
+ ctx->link_ev(srv, IBTRS_SRV_LINK_EV_CONNECTED, NULL);
+ mutex_unlock(&srv->paths_ev_mutex);
+
+ /* Mark session as established */
+ sess->established = true;
+}
+
+static void ibtrs_srv_sess_down(struct ibtrs_srv_sess *sess)
+{
+ struct ibtrs_srv *srv = sess->srv;
+ struct ibtrs_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->link_ev(srv, IBTRS_SRV_LINK_EV_DISCONNECTED, srv->priv);
+ mutex_unlock(&srv->paths_ev_mutex);
+}
+
+static int post_recv_sess(struct ibtrs_srv_sess *sess);
+
+static int process_info_req(struct ibtrs_srv_con *con,
+ struct ibtrs_msg_info_req *msg)
+{
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_srv *srv = sess->srv;
+ struct ibtrs_msg_info_rsp *rsp;
+ struct ibtrs_iu *tx_iu;
+ size_t tx_sz;
+ int i, err;
+
+ err = post_recv_sess(sess);
+ if (unlikely(err)) {
+ ibtrs_err(sess, "post_recv_sess(), err: %d\n", err);
+ return err;
+ }
+ memcpy(sess->s.sessname, msg->sessname, sizeof(sess->s.sessname));
+
+ tx_sz = sizeof(struct ibtrs_msg_info_rsp);
+ tx_sz += sizeof(u64) * srv->queue_depth;
+ tx_iu = ibtrs_iu_alloc(0, tx_sz, GFP_KERNEL, sess->s.ib_dev->dev,
+ DMA_TO_DEVICE, ibtrs_srv_info_rsp_done);
+ if (unlikely(!tx_iu)) {
+ ibtrs_err(sess, "ibtrs_iu_alloc(), err: %d\n", -ENOMEM);
+ return -ENOMEM;
+ }
+
+ rsp = tx_iu->buf;
+ rsp->type = cpu_to_le16(IBTRS_MSG_INFO_RSP);
+ rsp->addr_num = cpu_to_le16(srv->queue_depth);
+ for (i = 0; i < srv->queue_depth; i++)
+ rsp->addr[i] = cpu_to_le64(sess->rdma_addr[i]);
+
+ err = ibtrs_srv_create_sess_files(sess);
+ if (unlikely(err))
+ goto iu_free;
+
+ ibtrs_srv_change_state(sess, IBTRS_SRV_CONNECTED);
+ ibtrs_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.
+ */
+ ibtrs_srv_sess_up(sess);
+
+ /* Send info response */
+ err = ibtrs_iu_post_send(&con->c, tx_iu, tx_sz);
+ if (unlikely(err)) {
+ ibtrs_err(sess, "ibtrs_iu_post_send(), err: %d\n", err);
+iu_free:
+ ibtrs_iu_free(tx_iu, DMA_TO_DEVICE, sess->s.ib_dev->dev);
+ }
+
+ return err;
+}
+
+static void ibtrs_srv_info_req_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct ibtrs_srv_con *con = cq->cq_context;
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_msg_info_req *msg;
+ struct ibtrs_iu *iu;
+ int err;
+
+ WARN_ON(con->c.cid);
+
+ iu = container_of(wc->wr_cqe, struct ibtrs_iu, cqe);
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ ibtrs_err(sess, "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))) {
+ ibtrs_err(sess, "Sess info request is malformed: size %d\n",
+ wc->byte_len);
+ goto close;
+ }
+ msg = iu->buf;
+ if (unlikely(le32_to_cpu(msg->type) != IBTRS_MSG_INFO_REQ)) {
+ ibtrs_err(sess, "Sess info request is malformed: type %d\n",
+ le32_to_cpu(msg->type));
+ goto close;
+ }
+ err = process_info_req(con, msg);
+ if (unlikely(err))
+ goto close;
+
+out:
+ ibtrs_iu_free(iu, DMA_FROM_DEVICE, sess->s.ib_dev->dev);
+ return;
+close:
+ close_sess(sess);
+ goto out;
+}
+
+static int post_recv_info_req(struct ibtrs_srv_con *con)
+{
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_iu *rx_iu;
+ int err;
+
+ rx_iu = ibtrs_iu_alloc(0, sizeof(struct ibtrs_msg_info_req),
+ GFP_KERNEL, sess->s.ib_dev->dev,
+ DMA_FROM_DEVICE, ibtrs_srv_info_req_done);
+ if (unlikely(!rx_iu)) {
+ ibtrs_err(sess, "ibtrs_iu_alloc(): no memory\n");
+ return -ENOMEM;
+ }
+ /* Prepare for getting info response */
+ err = ibtrs_iu_post_recv(&con->c, rx_iu);
+ if (unlikely(err)) {
+ ibtrs_err(sess, "ibtrs_iu_post_recv(), err: %d\n", err);
+ ibtrs_iu_free(rx_iu, DMA_FROM_DEVICE, sess->s.ib_dev->dev);
+ return err;
+ }
+
+ return 0;
+}
+
+static int post_recv_io(struct ibtrs_srv_con *con)
+{
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_srv *srv = sess->srv;
+ int i, err;
+
+ for (i = 0; i < srv->queue_depth; i++) {
+ err = ibtrs_post_recv_empty(&con->c, &io_comp_cqe);
+ if (unlikely(err))
+ return err;
+ }
+
+ return 0;
+}
+
+static int post_recv_sess(struct ibtrs_srv_sess *sess)
+{
+ int err, cid;
+
+ for (cid = 0; cid < sess->s.con_num; cid++) {
+ err = post_recv_io(to_srv_con(sess->s.con[cid]));
+ if (unlikely(err)) {
+ ibtrs_err(sess, "post_recv_io(), err: %d\n", err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static void process_read(struct ibtrs_srv_con *con,
+ struct ibtrs_msg_rdma_read *msg,
+ u32 buf_id, u32 off)
+{
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_srv *srv = sess->srv;
+ struct ibtrs_srv_ctx *ctx = srv->ctx;
+ struct ibtrs_srv_op *id;
+
+ size_t usr_len, data_len;
+ void *data;
+ int ret;
+
+ if (unlikely(sess->state != IBTRS_SRV_CONNECTED)) {
+ ibtrs_err_rl(sess, "Processing read request failed, "
+ " session is disconnected, sess state %s\n",
+ ibtrs_srv_state_str(sess->state));
+ return;
+ }
+ ibtrs_srv_get_ops_ids(sess);
+ ibtrs_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->msg = msg;
+ usr_len = le16_to_cpu(msg->usr_len);
+ data_len = off - usr_len;
+ data = page_address(srv->chunks[buf_id]);
+ id->data_dma_addr = sess->rdma_addr[buf_id];
+ ret = ctx->rdma_ev(srv, srv->priv, id, READ, data, data_len,
+ data + data_len, usr_len);
+
+ if (unlikely(ret)) {
+ ibtrs_err_rl(sess, "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, buf_id, ret);
+ if (ret < 0) {
+ ibtrs_err_rl(sess, "Sending err msg for failed RDMA-Write-Req"
+ " failed, msg_id %d, err: %d\n", buf_id, ret);
+ close_sess(sess);
+ }
+ ibtrs_srv_put_ops_ids(sess);
+}
+
+static void process_write(struct ibtrs_srv_con *con,
+ struct ibtrs_msg_rdma_write *req,
+ u32 buf_id, u32 off)
+{
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_srv *srv = sess->srv;
+ struct ibtrs_srv_ctx *ctx = srv->ctx;
+ struct ibtrs_srv_op *id;
+
+ size_t data_len, usr_len;
+ void *data;
+ int ret;
+
+ if (unlikely(sess->state != IBTRS_SRV_CONNECTED)) {
+ ibtrs_err_rl(sess, "Processing write request failed, "
+ " session is disconnected, sess state %s\n",
+ ibtrs_srv_state_str(sess->state));
+ return;
+ }
+ ibtrs_srv_get_ops_ids(sess);
+ ibtrs_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->rdma_ev(srv, srv->priv, id, WRITE, data, data_len,
+ data + data_len, usr_len);
+ if (unlikely(ret)) {
+ ibtrs_err_rl(sess, "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, buf_id, ret);
+ if (ret < 0) {
+ ibtrs_err_rl(sess, "Processing write request failed, sending"
+ " I/O response failed, msg_id %d, err: %d\n",
+ buf_id, ret);
+ close_sess(sess);
+ }
+ ibtrs_srv_put_ops_ids(sess);
+}
+
+static void process_io_req(struct ibtrs_srv_con *con, void *msg,
+ u32 id, u32 off)
+{
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ unsigned int type;
+
+ type = le16_to_cpu(le16_to_cpu(*(__le16 *)msg));
+
+ switch (type) {
+ case IBTRS_MSG_WRITE:
+ process_write(con, msg, id, off);
+ break;
+ case IBTRS_MSG_READ:
+ process_read(con, msg, id, off);
+ break;
+ default:
+ ibtrs_err(sess, "Processing I/O request failed, "
+ "unknown message type received: 0x%02x\n", type);
+ goto err;
+ }
+
+ return;
+
+err:
+ close_sess(sess);
+}
+
+static void ibtrs_srv_rdma_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct ibtrs_srv_con *con = cq->cq_context;
+ struct ibtrs_srv_sess *sess = to_srv_sess(con->c.sess);
+ struct ibtrs_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) {
+ ibtrs_err(sess, "%s (wr_cqe: %p,"
+ " type: %s, vendor_err: 0x%x, len: %u)\n",
+ ib_wc_status_msg(wc->status), wc->wr_cqe,
+ ib_wc_opcode_str(wc->opcode),
+ wc->vendor_err, wc->byte_len);
+ close_sess(sess);
+ }
+ return;
+ }
+ ibtrs_srv_update_wc_stats(&sess->stats);
+
+ switch (wc->opcode) {
+ case IB_WC_RDMA_WRITE:
+ /*
+ * post_send() RDMA write completions of IO reqs (read/write)
+ * and hb
+ */
+ break;
+ 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 = ibtrs_post_recv_empty(&con->c, &io_comp_cqe);
+ if (unlikely(err)) {
+ ibtrs_err(sess, "ibtrs_post_recv(), err: %d\n", err);
+ close_sess(sess);
+ break;
+ }
+ ibtrs_from_imm(be32_to_cpu(wc->ex.imm_data),
+ &imm_type, &imm_payload);
+ if (likely(imm_type == IBTRS_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 > rcv_buf_size)) {
+ ibtrs_err(sess, "Wrong msg_id %u, off %u\n",
+ msg_id, off);
+ close_sess(sess);
+ return;
+ }
+ data = page_address(srv->chunks[msg_id]) + off;
+ process_io_req(con, data, msg_id, off);
+ } else if (imm_type == IBTRS_HB_MSG_IMM) {
+ WARN_ON(con->c.cid);
+ ibtrs_send_hb_ack(&sess->s);
+ } else if (imm_type == IBTRS_HB_ACK_IMM) {
+ WARN_ON(con->c.cid);
+ sess->s.hb_missed_cnt = 0;
+ } else {
+ ibtrs_wrn(sess, "Unknown IMM type %u\n", imm_type);
+ }
+ break;
+ default:
+ ibtrs_wrn(sess, "Unexpected WC type: %s\n",
+ ib_wc_opcode_str(wc->opcode));
+ return;
+ }
+}
+
+int ibtrs_srv_get_sess_name(struct ibtrs_srv *srv, char *sessname, size_t len)
+{
+ struct ibtrs_srv_sess *sess;
+ int err = -ENOTCONN;
+
+ mutex_lock(&srv->paths_mutex);
+ list_for_each_entry(sess, &srv->paths_list, s.entry) {
+ if (sess->state != IBTRS_SRV_CONNECTED)
+ continue;
+ memcpy(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(ibtrs_srv_get_sess_name);
+
+int ibtrs_srv_get_queue_depth(struct ibtrs_srv *srv)
+{
+ return srv->queue_depth;
+}
+EXPORT_SYMBOL(ibtrs_srv_get_queue_depth);
+
+static int find_next_bit_ring(int cur)
+{
+ int v = cpumask_next(cur, &cq_affinity_mask);
+
+ if (v >= nr_cpu_ids)
+ v = cpumask_first(&cq_affinity_mask);
+ return v;
+}
+
+static int ibtrs_srv_get_next_cq_vector(struct ibtrs_srv_sess *sess)
+{
+ sess->cur_cq_vector = find_next_bit_ring(sess->cur_cq_vector);
+
+ return sess->cur_cq_vector;
+}
+
+static struct ibtrs_srv *__alloc_srv(struct ibtrs_srv_ctx *ctx,
+ const uuid_t *paths_uuid)
+{
+ struct ibtrs_srv *srv;
+ int i;
+
+ srv = kzalloc(sizeof(*srv), GFP_KERNEL);
+ if (unlikely(!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 (unlikely(!srv->chunks))
+ goto err_free_srv;
+
+ for (i = 0; i < srv->queue_depth; i++) {
+ srv->chunks[i] = mempool_alloc(chunk_pool, GFP_KERNEL);
+ if (unlikely(!srv->chunks[i])) {
+ pr_err("mempool_alloc() failed\n");
+ 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 ibtrs_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);
+ kfree(srv);
+}
+
+static inline struct ibtrs_srv *__find_srv_and_get(struct ibtrs_srv_ctx *ctx,
+ const uuid_t *paths_uuid)
+{
+ struct ibtrs_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 ibtrs_srv *get_or_create_srv(struct ibtrs_srv_ctx *ctx,
+ const uuid_t *paths_uuid)
+{
+ struct ibtrs_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 ibtrs_srv *srv)
+{
+ if (refcount_dec_and_test(&srv->refcount)) {
+ struct ibtrs_srv_ctx *ctx = srv->ctx;
+
+ WARN_ON(srv->kobj.state_in_sysfs);
+ WARN_ON(srv->kobj_paths.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 ibtrs_srv *srv,
+ struct ibtrs_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 ibtrs_srv_sess *sess)
+{
+ struct ibtrs_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);
+}
+
+static void ibtrs_srv_close_work(struct work_struct *work)
+{
+ struct ibtrs_srv_sess *sess;
+ struct ibtrs_srv_ctx *ctx;
+ struct ibtrs_srv_con *con;
+ int i;
+
+ sess = container_of(work, typeof(*sess), close_work);
+ ctx = sess->srv->ctx;
+
+ ibtrs_srv_destroy_sess_files(sess);
+ ibtrs_srv_stop_hb(sess);
+
+ for (i = 0; i < sess->s.con_num; i++) {
+ con = to_srv_con(sess->s.con[i]);
+ if (!con)
+ continue;
+
+ rdma_disconnect(con->c.cm_id);
+ ib_drain_qp(con->c.qp);
+ }
+ /* Wait for all inflights */
+ ibtrs_srv_wait_ops_ids(sess);
+
+ /* Notify upper layer if we are the last path */
+ ibtrs_srv_sess_down(sess);
+
+ unmap_cont_bufs(sess);
+ ibtrs_srv_free_ops_ids(sess);
+
+ for (i = 0; i < sess->s.con_num; i++) {
+ con = to_srv_con(sess->s.con[i]);
+ if (!con)
+ continue;
+
+ ibtrs_cq_qp_destroy(&con->c);
+ rdma_destroy_id(con->c.cm_id);
+ kfree(con);
+ }
+ ibtrs_ib_dev_put(sess->s.ib_dev);
+
+ del_path_from_srv(sess);
+ put_srv(sess->srv);
+ sess->srv = NULL;
+ ibtrs_srv_change_state(sess, IBTRS_SRV_CLOSED);
+
+ kfree(sess->rdma_addr);
+ kfree(sess->s.con);
+ kfree(sess);
+}
+
+static int ibtrs_rdma_do_accept(struct ibtrs_srv_sess *sess,
+ struct rdma_cm_id *cm_id)
+{
+ struct ibtrs_srv *srv = sess->srv;
+ struct ibtrs_msg_conn_rsp msg;
+ struct rdma_conn_param param;
+ int err;
+
+ memset(&param, 0, sizeof(param));
+ param.retry_count = retry_count;
+ param.rnr_retry_count = 7;
+ param.private_data = &msg;
+ param.private_data_len = sizeof(msg);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.magic = cpu_to_le16(IBTRS_MAGIC);
+ msg.version = cpu_to_le16(IBTRS_VERSION);
+ msg.errno = 0;
+ msg.queue_depth = cpu_to_le16(srv->queue_depth);
+ msg.rkey = cpu_to_le32(sess->s.ib_dev->rkey);
+ msg.max_io_size = cpu_to_le32(max_io_size);
+ msg.max_req_size = cpu_to_le32(MAX_REQ_SIZE);
+ uuid_copy(&msg.uuid, &sess->s.uuid);
+
+ err = rdma_accept(cm_id, &param);
+ if (err)
+ pr_err("rdma_accept(), err: %d\n", err);
+
+ return err;
+}
+
+static int ibtrs_rdma_do_reject(struct rdma_cm_id *cm_id, int errno)
+{
+ struct ibtrs_msg_conn_rsp msg;
+ int err;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.magic = cpu_to_le16(IBTRS_MAGIC);
+ msg.version = cpu_to_le16(IBTRS_VERSION);
+ msg.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 ibtrs_srv_sess *
+__find_sess(struct ibtrs_srv *srv, const uuid_t *sess_uuid)
+{
+ struct ibtrs_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 ibtrs_srv_sess *sess,
+ struct rdma_cm_id *cm_id,
+ unsigned int cid)
+{
+ struct ibtrs_srv *srv = sess->srv;
+ struct ibtrs_srv_con *con;
+
+ u16 cq_size, wr_queue_size;
+ int err, cq_vector;
+
+ con = kzalloc(sizeof(*con), GFP_KERNEL);
+ if (unlikely(!con)) {
+ ibtrs_err(sess, "kzalloc() failed\n");
+ err = -ENOMEM;
+ goto err;
+ }
+
+ 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) {
+ cq_size = SERVICE_CON_QUEUE_DEPTH;
+ /* + 2 for drain and heartbeat */
+ wr_queue_size = SERVICE_CON_QUEUE_DEPTH + 2;
+ } else {
+ cq_size = srv->queue_depth;
+ wr_queue_size = sess->s.ib_dev->attrs.max_qp_wr;
+ }
+
+ cq_vector = ibtrs_srv_get_next_cq_vector(sess);
+
+ /* TODO: SOFTIRQ can be faster, but be careful with softirq context */
+ err = ibtrs_cq_qp_create(&sess->s, &con->c, 1, cq_vector, cq_size,
+ wr_queue_size, IB_POLL_WORKQUEUE);
+ if (unlikely(err)) {
+ ibtrs_err(sess, "ibtrs_cq_qp_create(), err: %d\n", err);
+ goto free_con;
+ }
+ if (con->c.cid == 0) {
+ err = post_recv_info_req(con);
+ if (unlikely(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:
+ ibtrs_cq_qp_destroy(&con->c);
+free_con:
+ kfree(con);
+
+err:
+ return err;
+}
+
+static struct ibtrs_srv_sess *__alloc_sess(struct ibtrs_srv *srv,
+ struct rdma_cm_id *cm_id,
+ unsigned int con_num,
+ unsigned int recon_cnt,
+ const uuid_t *uuid)
+{
+ struct ibtrs_srv_sess *sess;
+ int err = -ENOMEM;
+
+ if (unlikely(srv->paths_num >= MAX_PATHS_NUM)) {
+ err = -ECONNRESET;
+ goto err;
+ }
+ sess = kzalloc(sizeof(*sess), GFP_KERNEL);
+ if (unlikely(!sess))
+ goto err;
+
+ sess->rdma_addr = kcalloc(srv->queue_depth, sizeof(*sess->rdma_addr),
+ GFP_KERNEL);
+ if (unlikely(!sess->rdma_addr))
+ goto err_free_sess;
+
+ sess->s.con = kcalloc(con_num, sizeof(*sess->s.con), GFP_KERNEL);
+ if (unlikely(!sess->s.con))
+ goto err_free_rdma_addr;
+
+ sess->state = IBTRS_SRV_CONNECTING;
+ sess->srv = srv;
+ sess->cur_cq_vector = -1;
+ sess->s.dst_addr = cm_id->route.addr.dst_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, ibtrs_srv_close_work);
+ ibtrs_srv_init_hb(sess);
+
+ sess->s.ib_dev = ibtrs_ib_dev_find_get(cm_id);
+ if (unlikely(!sess->s.ib_dev)) {
+ err = -ENOMEM;
+ ibtrs_wrn(sess, "Failed to alloc ibtrs_device\n");
+ goto err_free_con;
+ }
+ err = map_cont_bufs(sess);
+ if (unlikely(err))
+ goto err_put_dev;
+
+ err = ibtrs_srv_alloc_ops_ids(sess);
+ if (unlikely(err))
+ goto err_unmap_bufs;
+
+ __add_path_to_srv(srv, sess);
+
+ return sess;
+
+err_unmap_bufs:
+ unmap_cont_bufs(sess);
+err_put_dev:
+ ibtrs_ib_dev_put(sess->s.ib_dev);
+err_free_con:
+ kfree(sess->s.con);
+err_free_rdma_addr:
+ kfree(sess->rdma_addr);
+err_free_sess:
+ kfree(sess);
+
+err:
+ return ERR_PTR(err);
+}
+
+static int ibtrs_rdma_connect(struct rdma_cm_id *cm_id,
+ const struct ibtrs_msg_conn_req *msg,
+ size_t len)
+{
+ struct ibtrs_srv_ctx *ctx = cm_id->context;
+ struct ibtrs_srv_sess *sess;
+ struct ibtrs_srv *srv;
+
+ u16 version, con_num, cid;
+ u16 recon_cnt;
+ int err;
+
+ if (unlikely(len < sizeof(*msg))) {
+ pr_err("Invalid IBTRS connection request");
+ goto reject_w_econnreset;
+ }
+ if (unlikely(le16_to_cpu(msg->magic) != IBTRS_MAGIC)) {
+ pr_err("Invalid IBTRS magic");
+ goto reject_w_econnreset;
+ }
+ version = le16_to_cpu(msg->version);
+ if (unlikely(version >> 8 != IBTRS_VER_MAJOR)) {
+ pr_err("Unsupported major IBTRS version: %d", version);
+ goto reject_w_econnreset;
+ }
+ con_num = le16_to_cpu(msg->cid_num);
+ if (unlikely(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 (unlikely(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 (unlikely(!srv)) {
+ err = -ENOMEM;
+ goto reject_w_err;
+ }
+ mutex_lock(&srv->paths_mutex);
+ sess = __find_sess(srv, &msg->sess_uuid);
+ if (sess) {
+ /* Session already holds a reference */
+ put_srv(srv);
+
+ if (unlikely(sess->s.recon_cnt != recon_cnt)) {
+ ibtrs_err(sess, "Reconnect detected %d != %d, but "
+ "previous session is still alive, reconnect "
+ "later\n", sess->s.recon_cnt, recon_cnt);
+ mutex_unlock(&srv->paths_mutex);
+ goto reject_w_ebusy;
+ }
+ if (unlikely(sess->state != IBTRS_SRV_CONNECTING)) {
+ ibtrs_err(sess, "Session in wrong state: %s\n",
+ ibtrs_srv_state_str(sess->state));
+ mutex_unlock(&srv->paths_mutex);
+ goto reject_w_econnreset;
+ }
+ /*
+ * Sanity checks
+ */
+ if (unlikely(con_num != sess->s.con_num ||
+ cid >= sess->s.con_num)) {
+ ibtrs_err(sess, "Incorrect request: %d, %d\n",
+ cid, con_num);
+ mutex_unlock(&srv->paths_mutex);
+ goto reject_w_econnreset;
+ }
+ if (unlikely(sess->s.con[cid])) {
+ ibtrs_err(sess, "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 (unlikely(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 (unlikely(err)) {
+ (void)ibtrs_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 = ibtrs_rdma_do_accept(sess, cm_id);
+ if (unlikely(err)) {
+ (void)ibtrs_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 ibtrs_rdma_do_reject(cm_id, err);
+
+reject_w_econnreset:
+ return ibtrs_rdma_do_reject(cm_id, -ECONNRESET);
+
+reject_w_ebusy:
+ return ibtrs_rdma_do_reject(cm_id, -EBUSY);
+
+close_and_return_err:
+ close_sess(sess);
+ mutex_unlock(&srv->paths_mutex);
+
+ return err;
+}
+
+static int ibtrs_srv_rdma_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *ev)
+{
+ struct ibtrs_srv_sess *sess = NULL;
+
+ if (ev->event != RDMA_CM_EVENT_CONNECT_REQUEST) {
+ struct ibtrs_con *c = cm_id->context;
+
+ sess = to_srv_sess(c->sess);
+ }
+
+ switch (ev->event) {
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ /*
+ * In case of error cma.c will destroy cm_id,
+ * see cma_process_remove()
+ */
+ return ibtrs_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:
+ ibtrs_err(sess, "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 *ibtrs_srv_cm_init(struct ibtrs_srv_ctx *ctx,
+ struct sockaddr *addr,
+ enum rdma_port_space ps)
+{
+ struct rdma_cm_id *cm_id;
+ int ret;
+
+ cm_id = rdma_create_id(&init_net, ibtrs_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;
+ }
+
+ switch (addr->sa_family) {
+ case AF_INET:
+ pr_debug("listening on port %u\n",
+ ntohs(((struct sockaddr_in *)addr)->sin_port));
+ break;
+ case AF_INET6:
+ pr_debug("listening on port %u\n",
+ ntohs(((struct sockaddr_in6 *)addr)->sin6_port));
+ break;
+ case AF_IB:
+ pr_debug("listening on service id 0x%016llx\n",
+ be64_to_cpu(rdma_get_service_id(cm_id, addr)));
+ break;
+ default:
+ pr_debug("listening on address family %u\n", addr->sa_family);
+ }
+
+ return cm_id;
+
+err_cm:
+ rdma_destroy_id(cm_id);
+err_out:
+
+ return ERR_PTR(ret);
+}
+
+static int ibtrs_srv_rdma_init(struct ibtrs_srv_ctx *ctx, unsigned int 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_addr.sib_subnet_prefix = 0ULL,
+ .sib_addr.sib_interface_id = 0ULL,
+ .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 = ibtrs_srv_cm_init(ctx, (struct sockaddr *)&sin, RDMA_PS_TCP);
+ if (unlikely(IS_ERR(cm_ip)))
+ return PTR_ERR(cm_ip);
+
+ cm_ib = ibtrs_srv_cm_init(ctx, (struct sockaddr *)&sib, RDMA_PS_IB);
+ if (unlikely(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 ibtrs_srv_ctx *alloc_srv_ctx(rdma_ev_fn *rdma_ev,
+ link_ev_fn *link_ev)
+{
+ struct ibtrs_srv_ctx *ctx;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return NULL;
+
+ ctx->rdma_ev = rdma_ev;
+ ctx->link_ev = link_ev;
+ mutex_init(&ctx->srv_mutex);
+ INIT_LIST_HEAD(&ctx->srv_list);
+
+ return ctx;
+}
+
+static void free_srv_ctx(struct ibtrs_srv_ctx *ctx)
+{
+ WARN_ON(!list_empty(&ctx->srv_list));
+ kfree(ctx);
+}
+
+struct ibtrs_srv_ctx *ibtrs_srv_open(rdma_ev_fn *rdma_ev, link_ev_fn *link_ev,
+ unsigned int port)
+{
+ struct ibtrs_srv_ctx *ctx;
+ int err;
+
+ ctx = alloc_srv_ctx(rdma_ev, link_ev);
+ if (unlikely(!ctx))
+ return ERR_PTR(-ENOMEM);
+
+ err = ibtrs_srv_rdma_init(ctx, port);
+ if (unlikely(err)) {
+ free_srv_ctx(ctx);
+ return ERR_PTR(err);
+ }
+ /* Do not let module be unloaded if server context is alive */
+ __module_get(THIS_MODULE);
+
+ return ctx;
+}
+EXPORT_SYMBOL(ibtrs_srv_open);
+
+void ibtrs_srv_queue_close(struct ibtrs_srv_sess *sess)
+{
+ close_sess(sess);
+}
+
+static void close_sess(struct ibtrs_srv_sess *sess)
+{
+ enum ibtrs_srv_state old_state;
+
+ if (ibtrs_srv_change_state_get_old(sess, IBTRS_SRV_CLOSING,
+ &old_state))
+ queue_work(ibtrs_wq, &sess->close_work);
+ WARN_ON(sess->state != IBTRS_SRV_CLOSING);
+}
+
+static void close_sessions(struct ibtrs_srv *srv)
+{
+ struct ibtrs_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 ibtrs_srv_ctx *ctx)
+{
+ struct ibtrs_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(ibtrs_wq);
+}
+
+void ibtrs_srv_close(struct ibtrs_srv_ctx *ctx)
+{
+ rdma_destroy_id(ctx->cm_id_ip);
+ rdma_destroy_id(ctx->cm_id_ib);
+ close_ctx(ctx);
+ free_srv_ctx(ctx);
+ module_put(THIS_MODULE);
+}
+EXPORT_SYMBOL(ibtrs_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 parameter value\n");
+ 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) + ilog2(rcv_buf_size - 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_io_size' parameters.\n", MAX_IMM_PAYL_BITS,
+ sess_queue_depth, rcv_buf_size);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int __init ibtrs_server_init(void)
+{
+ int err;
+
+ if (!strlen(cq_affinity_list))
+ init_cq_affinity();
+
+ pr_info("Loading module %s, version: %s "
+ "(retry_count: %d, cq_affinity_list: %s, "
+ "max_io_size: %d, sess_queue_depth: %d)\n",
+ KBUILD_MODNAME, IBTRS_VER_STRING, retry_count,
+ cq_affinity_list, max_io_size, sess_queue_depth);
+
+ 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(CHUNK_POOL_SIZE,
+ get_order(rcv_buf_size));
+ if (unlikely(!chunk_pool)) {
+ pr_err("Failed preallocate pool of chunks\n");
+ return -ENOMEM;
+ }
+ ibtrs_wq = alloc_workqueue("ibtrs_server_wq", WQ_MEM_RECLAIM, 0);
+ if (!ibtrs_wq) {
+ pr_err("Failed to load module, alloc ibtrs_server_wq failed\n");
+ goto out_chunk_pool;
+ }
+ err = ibtrs_srv_create_sysfs_module_files();
+ if (err) {
+ pr_err("Failed to load module, can't create sysfs files,"
+ " err: %d\n", err);
+ goto out_ibtrs_wq;
+ }
+
+ return 0;
+
+out_ibtrs_wq:
+ destroy_workqueue(ibtrs_wq);
+out_chunk_pool:
+ mempool_destroy(chunk_pool);
+
+ return err;
+}
+
+static void __exit ibtrs_server_exit(void)
+{
+ ibtrs_srv_destroy_sysfs_module_files();
+ destroy_workqueue(ibtrs_wq);
+ mempool_destroy(chunk_pool);
+}
+
+module_init(ibtrs_server_init);
+module_exit(ibtrs_server_exit);
--
2.13.1