2258 строки
54 KiB
C
2258 строки
54 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* RDMA Transport Layer
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*
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* Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
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* Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
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* Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
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*/
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#undef pr_fmt
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#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
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#include <linux/module.h>
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#include <linux/mempool.h>
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#include "rtrs-srv.h"
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#include "rtrs-log.h"
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#include <rdma/ib_cm.h>
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#include <rdma/ib_verbs.h>
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MODULE_DESCRIPTION("RDMA Transport Server");
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MODULE_LICENSE("GPL");
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/* Must be power of 2, see mask from mr->page_size in ib_sg_to_pages() */
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#define DEFAULT_MAX_CHUNK_SIZE (128 << 10)
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#define DEFAULT_SESS_QUEUE_DEPTH 512
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#define MAX_HDR_SIZE PAGE_SIZE
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/* We guarantee to serve 10 paths at least */
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#define CHUNK_POOL_SZ 10
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static struct rtrs_rdma_dev_pd dev_pd;
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static mempool_t *chunk_pool;
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struct class *rtrs_dev_class;
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static struct rtrs_srv_ib_ctx ib_ctx;
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static int __read_mostly max_chunk_size = DEFAULT_MAX_CHUNK_SIZE;
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static int __read_mostly sess_queue_depth = DEFAULT_SESS_QUEUE_DEPTH;
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static bool always_invalidate = true;
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module_param(always_invalidate, bool, 0444);
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MODULE_PARM_DESC(always_invalidate,
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"Invalidate memory registration for contiguous memory regions before accessing.");
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module_param_named(max_chunk_size, max_chunk_size, int, 0444);
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MODULE_PARM_DESC(max_chunk_size,
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"Max size for each IO request, when change the unit is in byte (default: "
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__stringify(DEFAULT_MAX_CHUNK_SIZE) "KB)");
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module_param_named(sess_queue_depth, sess_queue_depth, int, 0444);
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MODULE_PARM_DESC(sess_queue_depth,
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"Number of buffers for pending I/O requests to allocate per session. Maximum: "
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__stringify(MAX_SESS_QUEUE_DEPTH) " (default: "
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__stringify(DEFAULT_SESS_QUEUE_DEPTH) ")");
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static cpumask_t cq_affinity_mask = { CPU_BITS_ALL };
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static struct workqueue_struct *rtrs_wq;
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static inline struct rtrs_srv_con *to_srv_con(struct rtrs_con *c)
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{
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return container_of(c, struct rtrs_srv_con, c);
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}
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static inline struct rtrs_srv_sess *to_srv_sess(struct rtrs_sess *s)
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{
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return container_of(s, struct rtrs_srv_sess, s);
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}
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static bool __rtrs_srv_change_state(struct rtrs_srv_sess *sess,
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enum rtrs_srv_state new_state)
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{
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enum rtrs_srv_state old_state;
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bool changed = false;
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lockdep_assert_held(&sess->state_lock);
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old_state = sess->state;
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switch (new_state) {
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case RTRS_SRV_CONNECTED:
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switch (old_state) {
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case RTRS_SRV_CONNECTING:
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changed = true;
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fallthrough;
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default:
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break;
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}
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break;
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case RTRS_SRV_CLOSING:
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switch (old_state) {
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case RTRS_SRV_CONNECTING:
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case RTRS_SRV_CONNECTED:
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changed = true;
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fallthrough;
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default:
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break;
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}
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break;
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case RTRS_SRV_CLOSED:
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switch (old_state) {
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case RTRS_SRV_CLOSING:
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changed = true;
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fallthrough;
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default:
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break;
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}
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break;
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default:
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break;
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}
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if (changed)
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sess->state = new_state;
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return changed;
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}
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static bool rtrs_srv_change_state_get_old(struct rtrs_srv_sess *sess,
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enum rtrs_srv_state new_state,
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enum rtrs_srv_state *old_state)
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{
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bool changed;
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spin_lock_irq(&sess->state_lock);
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*old_state = sess->state;
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changed = __rtrs_srv_change_state(sess, new_state);
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spin_unlock_irq(&sess->state_lock);
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return changed;
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}
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static bool rtrs_srv_change_state(struct rtrs_srv_sess *sess,
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enum rtrs_srv_state new_state)
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{
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enum rtrs_srv_state old_state;
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return rtrs_srv_change_state_get_old(sess, new_state, &old_state);
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}
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static void free_id(struct rtrs_srv_op *id)
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{
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if (!id)
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return;
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kfree(id);
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}
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static void rtrs_srv_free_ops_ids(struct rtrs_srv_sess *sess)
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{
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struct rtrs_srv *srv = sess->srv;
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int i;
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WARN_ON(atomic_read(&sess->ids_inflight));
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if (sess->ops_ids) {
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for (i = 0; i < srv->queue_depth; i++)
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free_id(sess->ops_ids[i]);
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kfree(sess->ops_ids);
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sess->ops_ids = NULL;
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}
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}
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static void rtrs_srv_rdma_done(struct ib_cq *cq, struct ib_wc *wc);
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static struct ib_cqe io_comp_cqe = {
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.done = rtrs_srv_rdma_done
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};
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static int rtrs_srv_alloc_ops_ids(struct rtrs_srv_sess *sess)
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{
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struct rtrs_srv *srv = sess->srv;
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struct rtrs_srv_op *id;
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int i;
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sess->ops_ids = kcalloc(srv->queue_depth, sizeof(*sess->ops_ids),
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GFP_KERNEL);
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if (!sess->ops_ids)
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goto err;
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for (i = 0; i < srv->queue_depth; ++i) {
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id = kzalloc(sizeof(*id), GFP_KERNEL);
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if (!id)
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goto err;
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sess->ops_ids[i] = id;
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}
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init_waitqueue_head(&sess->ids_waitq);
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atomic_set(&sess->ids_inflight, 0);
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return 0;
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err:
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rtrs_srv_free_ops_ids(sess);
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return -ENOMEM;
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}
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static inline void rtrs_srv_get_ops_ids(struct rtrs_srv_sess *sess)
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{
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atomic_inc(&sess->ids_inflight);
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}
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static inline void rtrs_srv_put_ops_ids(struct rtrs_srv_sess *sess)
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{
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if (atomic_dec_and_test(&sess->ids_inflight))
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wake_up(&sess->ids_waitq);
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}
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static void rtrs_srv_wait_ops_ids(struct rtrs_srv_sess *sess)
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{
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wait_event(sess->ids_waitq, !atomic_read(&sess->ids_inflight));
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}
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static void rtrs_srv_reg_mr_done(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct rtrs_srv_con *con = cq->cq_context;
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struct rtrs_sess *s = con->c.sess;
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struct rtrs_srv_sess *sess = to_srv_sess(s);
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if (unlikely(wc->status != IB_WC_SUCCESS)) {
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rtrs_err(s, "REG MR failed: %s\n",
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ib_wc_status_msg(wc->status));
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close_sess(sess);
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return;
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}
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}
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static struct ib_cqe local_reg_cqe = {
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.done = rtrs_srv_reg_mr_done
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};
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static int rdma_write_sg(struct rtrs_srv_op *id)
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{
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struct rtrs_sess *s = id->con->c.sess;
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struct rtrs_srv_sess *sess = to_srv_sess(s);
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dma_addr_t dma_addr = sess->dma_addr[id->msg_id];
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struct rtrs_srv_mr *srv_mr;
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struct rtrs_srv *srv = sess->srv;
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struct ib_send_wr inv_wr, imm_wr;
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struct ib_rdma_wr *wr = NULL;
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enum ib_send_flags flags;
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size_t sg_cnt;
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int err, offset;
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bool need_inval;
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u32 rkey = 0;
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struct ib_reg_wr rwr;
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struct ib_sge *plist;
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struct ib_sge list;
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sg_cnt = le16_to_cpu(id->rd_msg->sg_cnt);
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need_inval = le16_to_cpu(id->rd_msg->flags) & RTRS_MSG_NEED_INVAL_F;
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if (unlikely(sg_cnt != 1))
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return -EINVAL;
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offset = 0;
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wr = &id->tx_wr;
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plist = &id->tx_sg;
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plist->addr = dma_addr + offset;
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plist->length = le32_to_cpu(id->rd_msg->desc[0].len);
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/* WR will fail with length error
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* if this is 0
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*/
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if (unlikely(plist->length == 0)) {
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rtrs_err(s, "Invalid RDMA-Write sg list length 0\n");
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return -EINVAL;
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}
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plist->lkey = sess->s.dev->ib_pd->local_dma_lkey;
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offset += plist->length;
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wr->wr.sg_list = plist;
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wr->wr.num_sge = 1;
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wr->remote_addr = le64_to_cpu(id->rd_msg->desc[0].addr);
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wr->rkey = le32_to_cpu(id->rd_msg->desc[0].key);
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if (rkey == 0)
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rkey = wr->rkey;
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else
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/* Only one key is actually used */
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WARN_ON_ONCE(rkey != wr->rkey);
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wr->wr.opcode = IB_WR_RDMA_WRITE;
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wr->wr.ex.imm_data = 0;
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wr->wr.send_flags = 0;
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if (need_inval && always_invalidate) {
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wr->wr.next = &rwr.wr;
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rwr.wr.next = &inv_wr;
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inv_wr.next = &imm_wr;
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} else if (always_invalidate) {
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wr->wr.next = &rwr.wr;
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rwr.wr.next = &imm_wr;
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} else if (need_inval) {
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wr->wr.next = &inv_wr;
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inv_wr.next = &imm_wr;
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} else {
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wr->wr.next = &imm_wr;
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}
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/*
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* From time to time we have to post signaled sends,
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* or send queue will fill up and only QP reset can help.
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*/
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flags = (atomic_inc_return(&id->con->wr_cnt) % srv->queue_depth) ?
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0 : IB_SEND_SIGNALED;
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if (need_inval) {
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inv_wr.sg_list = NULL;
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inv_wr.num_sge = 0;
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inv_wr.opcode = IB_WR_SEND_WITH_INV;
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inv_wr.send_flags = 0;
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inv_wr.ex.invalidate_rkey = rkey;
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}
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imm_wr.next = NULL;
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if (always_invalidate) {
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struct rtrs_msg_rkey_rsp *msg;
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srv_mr = &sess->mrs[id->msg_id];
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rwr.wr.opcode = IB_WR_REG_MR;
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rwr.wr.num_sge = 0;
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rwr.mr = srv_mr->mr;
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rwr.wr.send_flags = 0;
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rwr.key = srv_mr->mr->rkey;
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rwr.access = (IB_ACCESS_LOCAL_WRITE |
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IB_ACCESS_REMOTE_WRITE);
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msg = srv_mr->iu->buf;
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msg->buf_id = cpu_to_le16(id->msg_id);
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msg->type = cpu_to_le16(RTRS_MSG_RKEY_RSP);
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msg->rkey = cpu_to_le32(srv_mr->mr->rkey);
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list.addr = srv_mr->iu->dma_addr;
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list.length = sizeof(*msg);
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list.lkey = sess->s.dev->ib_pd->local_dma_lkey;
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imm_wr.sg_list = &list;
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imm_wr.num_sge = 1;
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imm_wr.opcode = IB_WR_SEND_WITH_IMM;
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ib_dma_sync_single_for_device(sess->s.dev->ib_dev,
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srv_mr->iu->dma_addr,
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srv_mr->iu->size, DMA_TO_DEVICE);
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} else {
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imm_wr.sg_list = NULL;
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imm_wr.num_sge = 0;
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imm_wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM;
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}
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imm_wr.send_flags = flags;
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imm_wr.ex.imm_data = cpu_to_be32(rtrs_to_io_rsp_imm(id->msg_id,
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0, need_inval));
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imm_wr.wr_cqe = &io_comp_cqe;
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ib_dma_sync_single_for_device(sess->s.dev->ib_dev, dma_addr,
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offset, DMA_BIDIRECTIONAL);
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err = ib_post_send(id->con->c.qp, &id->tx_wr.wr, NULL);
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if (unlikely(err))
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rtrs_err(s,
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"Posting RDMA-Write-Request to QP failed, err: %d\n",
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err);
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return err;
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}
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/**
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* send_io_resp_imm() - respond to client with empty IMM on failed READ/WRITE
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* requests or on successful WRITE request.
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* @con: the connection to send back result
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* @id: the id associated with the IO
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* @errno: the error number of the IO.
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*
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* Return 0 on success, errno otherwise.
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*/
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static int send_io_resp_imm(struct rtrs_srv_con *con, struct rtrs_srv_op *id,
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int errno)
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{
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struct rtrs_sess *s = con->c.sess;
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struct rtrs_srv_sess *sess = to_srv_sess(s);
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struct ib_send_wr inv_wr, imm_wr, *wr = NULL;
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struct ib_reg_wr rwr;
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struct rtrs_srv *srv = sess->srv;
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struct rtrs_srv_mr *srv_mr;
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bool need_inval = false;
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enum ib_send_flags flags;
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u32 imm;
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int err;
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if (id->dir == READ) {
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struct rtrs_msg_rdma_read *rd_msg = id->rd_msg;
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size_t sg_cnt;
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need_inval = le16_to_cpu(rd_msg->flags) &
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RTRS_MSG_NEED_INVAL_F;
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sg_cnt = le16_to_cpu(rd_msg->sg_cnt);
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if (need_inval) {
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if (likely(sg_cnt)) {
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inv_wr.sg_list = NULL;
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inv_wr.num_sge = 0;
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inv_wr.opcode = IB_WR_SEND_WITH_INV;
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inv_wr.send_flags = 0;
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/* Only one key is actually used */
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inv_wr.ex.invalidate_rkey =
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le32_to_cpu(rd_msg->desc[0].key);
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} else {
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WARN_ON_ONCE(1);
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need_inval = false;
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}
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}
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}
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if (need_inval && always_invalidate) {
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wr = &inv_wr;
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inv_wr.next = &rwr.wr;
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rwr.wr.next = &imm_wr;
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} else if (always_invalidate) {
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wr = &rwr.wr;
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rwr.wr.next = &imm_wr;
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} else if (need_inval) {
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wr = &inv_wr;
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inv_wr.next = &imm_wr;
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} else {
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wr = &imm_wr;
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}
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/*
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* From time to time we have to post signalled sends,
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* or send queue will fill up and only QP reset can help.
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*/
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flags = (atomic_inc_return(&con->wr_cnt) % srv->queue_depth) ?
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0 : IB_SEND_SIGNALED;
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imm = rtrs_to_io_rsp_imm(id->msg_id, errno, need_inval);
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imm_wr.next = NULL;
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if (always_invalidate) {
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struct ib_sge list;
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struct rtrs_msg_rkey_rsp *msg;
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srv_mr = &sess->mrs[id->msg_id];
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rwr.wr.next = &imm_wr;
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rwr.wr.opcode = IB_WR_REG_MR;
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rwr.wr.num_sge = 0;
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rwr.wr.send_flags = 0;
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rwr.mr = srv_mr->mr;
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rwr.key = srv_mr->mr->rkey;
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rwr.access = (IB_ACCESS_LOCAL_WRITE |
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IB_ACCESS_REMOTE_WRITE);
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msg = srv_mr->iu->buf;
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msg->buf_id = cpu_to_le16(id->msg_id);
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msg->type = cpu_to_le16(RTRS_MSG_RKEY_RSP);
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msg->rkey = cpu_to_le32(srv_mr->mr->rkey);
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list.addr = srv_mr->iu->dma_addr;
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list.length = sizeof(*msg);
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list.lkey = sess->s.dev->ib_pd->local_dma_lkey;
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imm_wr.sg_list = &list;
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imm_wr.num_sge = 1;
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imm_wr.opcode = IB_WR_SEND_WITH_IMM;
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ib_dma_sync_single_for_device(sess->s.dev->ib_dev,
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srv_mr->iu->dma_addr,
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srv_mr->iu->size, DMA_TO_DEVICE);
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} else {
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imm_wr.sg_list = NULL;
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imm_wr.num_sge = 0;
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imm_wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM;
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}
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imm_wr.send_flags = flags;
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imm_wr.wr_cqe = &io_comp_cqe;
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imm_wr.ex.imm_data = cpu_to_be32(imm);
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err = ib_post_send(id->con->c.qp, wr, NULL);
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if (unlikely(err))
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rtrs_err_rl(s, "Posting RDMA-Reply to QP failed, err: %d\n",
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err);
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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_sess *sess;
|
|
struct rtrs_srv_con *con;
|
|
struct rtrs_sess *s;
|
|
int err;
|
|
|
|
if (WARN_ON(!id))
|
|
return true;
|
|
|
|
con = id->con;
|
|
s = con->c.sess;
|
|
sess = to_srv_sess(s);
|
|
|
|
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;
|
|
|
|
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 < 0 || nr < sgt->nents) {
|
|
err = nr < 0 ? nr : -EINVAL;
|
|
goto dereg_mr;
|
|
}
|
|
|
|
if (always_invalidate) {
|
|
srv_mr->iu = rtrs_iu_alloc(1,
|
|
sizeof(struct rtrs_msg_rkey_rsp),
|
|
GFP_KERNEL, sess->s.dev->ib_dev,
|
|
DMA_TO_DEVICE, rtrs_srv_rdma_done);
|
|
if (!srv_mr->iu) {
|
|
err = -ENOMEM;
|
|
rtrs_err(ss, "rtrs_iu_alloc(), err: %d\n", err);
|
|
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 void rtrs_srv_dev_release(struct device *dev)
|
|
{
|
|
struct rtrs_srv *srv = container_of(dev, struct rtrs_srv, dev);
|
|
|
|
kfree(srv);
|
|
}
|
|
|
|
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;
|
|
device_initialize(&srv->dev);
|
|
srv->dev.release = rtrs_srv_dev_release;
|
|
|
|
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);
|
|
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);
|
|
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);
|
|
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), IB_CM_REJ_CONSUMER_DEFINED);
|
|
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 != s->con_num || cid >= s->con_num) {
|
|
rtrs_err(s, "Incorrect request: %d, %d\n",
|
|
cid, con_num);
|
|
mutex_unlock(&srv->paths_mutex);
|
|
goto reject_w_econnreset;
|
|
}
|
|
if (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);
|
|
}
|
|
|
|
static int rtrs_srv_add_one(struct ib_device *device)
|
|
{
|
|
struct rtrs_srv_ctx *ctx;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&ib_ctx.ib_dev_mutex);
|
|
if (ib_ctx.ib_dev_count)
|
|
goto out;
|
|
|
|
/*
|
|
* Since our CM IDs are NOT bound to any ib device we will create them
|
|
* only once
|
|
*/
|
|
ctx = ib_ctx.srv_ctx;
|
|
ret = rtrs_srv_rdma_init(ctx, ib_ctx.port);
|
|
if (ret) {
|
|
/*
|
|
* We errored out here.
|
|
* According to the ib code, if we encounter an error here then the
|
|
* error code is ignored, and no more calls to our ops are made.
|
|
*/
|
|
pr_err("Failed to initialize RDMA connection");
|
|
goto err_out;
|
|
}
|
|
|
|
out:
|
|
/*
|
|
* Keep a track on the number of ib devices added
|
|
*/
|
|
ib_ctx.ib_dev_count++;
|
|
|
|
err_out:
|
|
mutex_unlock(&ib_ctx.ib_dev_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void rtrs_srv_remove_one(struct ib_device *device, void *client_data)
|
|
{
|
|
struct rtrs_srv_ctx *ctx;
|
|
|
|
mutex_lock(&ib_ctx.ib_dev_mutex);
|
|
ib_ctx.ib_dev_count--;
|
|
|
|
if (ib_ctx.ib_dev_count)
|
|
goto out;
|
|
|
|
/*
|
|
* Since our CM IDs are NOT bound to any ib device we will remove them
|
|
* only once, when the last device is removed
|
|
*/
|
|
ctx = ib_ctx.srv_ctx;
|
|
rdma_destroy_id(ctx->cm_id_ip);
|
|
rdma_destroy_id(ctx->cm_id_ib);
|
|
|
|
out:
|
|
mutex_unlock(&ib_ctx.ib_dev_mutex);
|
|
}
|
|
|
|
static struct ib_client rtrs_srv_client = {
|
|
.name = "rtrs_server",
|
|
.add = rtrs_srv_add_one,
|
|
.remove = rtrs_srv_remove_one
|
|
};
|
|
|
|
/**
|
|
* 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);
|
|
|
|
mutex_init(&ib_ctx.ib_dev_mutex);
|
|
ib_ctx.srv_ctx = ctx;
|
|
ib_ctx.port = port;
|
|
|
|
err = ib_register_client(&rtrs_srv_client);
|
|
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)
|
|
{
|
|
ib_unregister_client(&rtrs_srv_client);
|
|
mutex_destroy(&ib_ctx.ib_dev_mutex);
|
|
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", 0, 0);
|
|
if (!rtrs_wq) {
|
|
err = -ENOMEM;
|
|
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);
|