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2989 lines
76 KiB
2989 lines
76 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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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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|
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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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|
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#include <linux/module.h> |
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#include <linux/rculist.h> |
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#include <linux/random.h> |
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|
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#include "rtrs-clt.h" |
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#include "rtrs-log.h" |
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|
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#define RTRS_CONNECT_TIMEOUT_MS 30000 |
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/* |
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* Wait a bit before trying to reconnect after a failure |
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* in order to give server time to finish clean up which |
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* leads to "false positives" failed reconnect attempts |
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*/ |
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#define RTRS_RECONNECT_BACKOFF 1000 |
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/* |
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* Wait for additional random time between 0 and 8 seconds |
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* before starting to reconnect to avoid clients reconnecting |
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* all at once in case of a major network outage |
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*/ |
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#define RTRS_RECONNECT_SEED 8 |
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|
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#define FIRST_CONN 0x01 |
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|
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MODULE_DESCRIPTION("RDMA Transport Client"); |
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MODULE_LICENSE("GPL"); |
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|
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static const struct rtrs_rdma_dev_pd_ops dev_pd_ops; |
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static struct rtrs_rdma_dev_pd dev_pd = { |
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.ops = &dev_pd_ops |
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}; |
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|
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static struct workqueue_struct *rtrs_wq; |
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static struct class *rtrs_clt_dev_class; |
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|
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static inline bool rtrs_clt_is_connected(const struct rtrs_clt *clt) |
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{ |
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struct rtrs_clt_sess *sess; |
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bool connected = false; |
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|
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rcu_read_lock(); |
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list_for_each_entry_rcu(sess, &clt->paths_list, s.entry) |
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connected |= READ_ONCE(sess->state) == RTRS_CLT_CONNECTED; |
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rcu_read_unlock(); |
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|
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return connected; |
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} |
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|
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static struct rtrs_permit * |
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__rtrs_get_permit(struct rtrs_clt *clt, enum rtrs_clt_con_type con_type) |
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{ |
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size_t max_depth = clt->queue_depth; |
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struct rtrs_permit *permit; |
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int bit; |
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|
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/* |
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* Adapted from null_blk get_tag(). Callers from different cpus may |
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* grab the same bit, since find_first_zero_bit is not atomic. |
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* But then the test_and_set_bit_lock will fail for all the |
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* callers but one, so that they will loop again. |
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* This way an explicit spinlock is not required. |
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*/ |
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do { |
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bit = find_first_zero_bit(clt->permits_map, max_depth); |
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if (unlikely(bit >= max_depth)) |
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return NULL; |
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} while (unlikely(test_and_set_bit_lock(bit, clt->permits_map))); |
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|
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permit = get_permit(clt, bit); |
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WARN_ON(permit->mem_id != bit); |
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permit->cpu_id = raw_smp_processor_id(); |
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permit->con_type = con_type; |
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|
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return permit; |
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} |
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|
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static inline void __rtrs_put_permit(struct rtrs_clt *clt, |
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struct rtrs_permit *permit) |
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{ |
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clear_bit_unlock(permit->mem_id, clt->permits_map); |
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} |
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|
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/** |
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* rtrs_clt_get_permit() - allocates permit for future RDMA operation |
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* @clt: Current session |
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* @con_type: Type of connection to use with the permit |
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* @can_wait: Wait type |
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* |
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* Description: |
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* Allocates permit for the following RDMA operation. Permit is used |
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* to preallocate all resources and to propagate memory pressure |
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* up earlier. |
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* |
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* Context: |
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* Can sleep if @wait == RTRS_TAG_WAIT |
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*/ |
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struct rtrs_permit *rtrs_clt_get_permit(struct rtrs_clt *clt, |
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enum rtrs_clt_con_type con_type, |
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int can_wait) |
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{ |
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struct rtrs_permit *permit; |
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DEFINE_WAIT(wait); |
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|
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permit = __rtrs_get_permit(clt, con_type); |
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if (likely(permit) || !can_wait) |
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return permit; |
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|
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do { |
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prepare_to_wait(&clt->permits_wait, &wait, |
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TASK_UNINTERRUPTIBLE); |
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permit = __rtrs_get_permit(clt, con_type); |
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if (likely(permit)) |
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break; |
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|
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io_schedule(); |
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} while (1); |
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|
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finish_wait(&clt->permits_wait, &wait); |
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|
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return permit; |
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} |
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EXPORT_SYMBOL(rtrs_clt_get_permit); |
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|
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/** |
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* rtrs_clt_put_permit() - puts allocated permit |
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* @clt: Current session |
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* @permit: Permit to be freed |
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* |
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* Context: |
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* Does not matter |
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*/ |
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void rtrs_clt_put_permit(struct rtrs_clt *clt, struct rtrs_permit *permit) |
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{ |
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if (WARN_ON(!test_bit(permit->mem_id, clt->permits_map))) |
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return; |
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|
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__rtrs_put_permit(clt, permit); |
|
|
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/* |
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* rtrs_clt_get_permit() adds itself to the &clt->permits_wait list |
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* before calling schedule(). So if rtrs_clt_get_permit() is sleeping |
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* it must have added itself to &clt->permits_wait before |
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* __rtrs_put_permit() finished. |
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* Hence it is safe to guard wake_up() with a waitqueue_active() test. |
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*/ |
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if (waitqueue_active(&clt->permits_wait)) |
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wake_up(&clt->permits_wait); |
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} |
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EXPORT_SYMBOL(rtrs_clt_put_permit); |
|
|
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/** |
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* rtrs_permit_to_clt_con() - returns RDMA connection pointer by the permit |
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* @sess: client session pointer |
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* @permit: permit for the allocation of the RDMA buffer |
|
* Note: |
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* IO connection starts from 1. |
|
* 0 connection is for user messages. |
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*/ |
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static |
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struct rtrs_clt_con *rtrs_permit_to_clt_con(struct rtrs_clt_sess *sess, |
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struct rtrs_permit *permit) |
|
{ |
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int id = 0; |
|
|
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if (likely(permit->con_type == RTRS_IO_CON)) |
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id = (permit->cpu_id % (sess->s.con_num - 1)) + 1; |
|
|
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return to_clt_con(sess->s.con[id]); |
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} |
|
|
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/** |
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* rtrs_clt_change_state() - change the session state through session state |
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* machine. |
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* |
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* @sess: client session to change the state of. |
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* @new_state: state to change to. |
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* |
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* returns true if sess's state is changed to new state, otherwise return false. |
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* |
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* Locks: |
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* state_wq lock must be hold. |
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*/ |
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static bool rtrs_clt_change_state(struct rtrs_clt_sess *sess, |
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enum rtrs_clt_state new_state) |
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{ |
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enum rtrs_clt_state old_state; |
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bool changed = false; |
|
|
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lockdep_assert_held(&sess->state_wq.lock); |
|
|
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old_state = sess->state; |
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switch (new_state) { |
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case RTRS_CLT_CONNECTING: |
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switch (old_state) { |
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case RTRS_CLT_RECONNECTING: |
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changed = true; |
|
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_CLT_RECONNECTING: |
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switch (old_state) { |
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case RTRS_CLT_CONNECTED: |
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case RTRS_CLT_CONNECTING_ERR: |
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case RTRS_CLT_CLOSED: |
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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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break; |
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case RTRS_CLT_CONNECTED: |
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switch (old_state) { |
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case RTRS_CLT_CONNECTING: |
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changed = true; |
|
fallthrough; |
|
default: |
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break; |
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} |
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break; |
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case RTRS_CLT_CONNECTING_ERR: |
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switch (old_state) { |
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case RTRS_CLT_CONNECTING: |
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changed = true; |
|
fallthrough; |
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default: |
|
break; |
|
} |
|
break; |
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case RTRS_CLT_CLOSING: |
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switch (old_state) { |
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case RTRS_CLT_CONNECTING: |
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case RTRS_CLT_CONNECTING_ERR: |
|
case RTRS_CLT_RECONNECTING: |
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case RTRS_CLT_CONNECTED: |
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changed = true; |
|
fallthrough; |
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default: |
|
break; |
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} |
|
break; |
|
case RTRS_CLT_CLOSED: |
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switch (old_state) { |
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case RTRS_CLT_CLOSING: |
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changed = true; |
|
fallthrough; |
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default: |
|
break; |
|
} |
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break; |
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case RTRS_CLT_DEAD: |
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switch (old_state) { |
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case RTRS_CLT_CLOSED: |
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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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wake_up_locked(&sess->state_wq); |
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} |
|
|
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return changed; |
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} |
|
|
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static bool rtrs_clt_change_state_from_to(struct rtrs_clt_sess *sess, |
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enum rtrs_clt_state old_state, |
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enum rtrs_clt_state new_state) |
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{ |
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bool changed = false; |
|
|
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spin_lock_irq(&sess->state_wq.lock); |
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if (sess->state == old_state) |
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changed = rtrs_clt_change_state(sess, new_state); |
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spin_unlock_irq(&sess->state_wq.lock); |
|
|
|
return changed; |
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} |
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|
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static void rtrs_rdma_error_recovery(struct rtrs_clt_con *con) |
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{ |
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struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
|
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if (rtrs_clt_change_state_from_to(sess, |
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RTRS_CLT_CONNECTED, |
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RTRS_CLT_RECONNECTING)) { |
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struct rtrs_clt *clt = sess->clt; |
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unsigned int delay_ms; |
|
|
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/* |
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* Normal scenario, reconnect if we were successfully connected |
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*/ |
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delay_ms = clt->reconnect_delay_sec * 1000; |
|
queue_delayed_work(rtrs_wq, &sess->reconnect_dwork, |
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msecs_to_jiffies(delay_ms + |
|
prandom_u32() % RTRS_RECONNECT_SEED)); |
|
} else { |
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/* |
|
* Error can happen just on establishing new connection, |
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* so notify waiter with error state, waiter is responsible |
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* for cleaning the rest and reconnect if needed. |
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*/ |
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rtrs_clt_change_state_from_to(sess, |
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RTRS_CLT_CONNECTING, |
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RTRS_CLT_CONNECTING_ERR); |
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} |
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} |
|
|
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static void rtrs_clt_fast_reg_done(struct ib_cq *cq, struct ib_wc *wc) |
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{ |
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struct rtrs_clt_con *con = cq->cq_context; |
|
|
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if (unlikely(wc->status != IB_WC_SUCCESS)) { |
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rtrs_err(con->c.sess, "Failed IB_WR_REG_MR: %s\n", |
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ib_wc_status_msg(wc->status)); |
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rtrs_rdma_error_recovery(con); |
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} |
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} |
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|
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static struct ib_cqe fast_reg_cqe = { |
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.done = rtrs_clt_fast_reg_done |
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}; |
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|
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static void complete_rdma_req(struct rtrs_clt_io_req *req, int errno, |
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bool notify, bool can_wait); |
|
|
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static void rtrs_clt_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc) |
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{ |
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struct rtrs_clt_io_req *req = |
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container_of(wc->wr_cqe, typeof(*req), inv_cqe); |
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struct rtrs_clt_con *con = cq->cq_context; |
|
|
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if (unlikely(wc->status != IB_WC_SUCCESS)) { |
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rtrs_err(con->c.sess, "Failed IB_WR_LOCAL_INV: %s\n", |
|
ib_wc_status_msg(wc->status)); |
|
rtrs_rdma_error_recovery(con); |
|
} |
|
req->need_inv = false; |
|
if (likely(req->need_inv_comp)) |
|
complete(&req->inv_comp); |
|
else |
|
/* Complete request from INV callback */ |
|
complete_rdma_req(req, req->inv_errno, true, false); |
|
} |
|
|
|
static int rtrs_inv_rkey(struct rtrs_clt_io_req *req) |
|
{ |
|
struct rtrs_clt_con *con = req->con; |
|
struct ib_send_wr wr = { |
|
.opcode = IB_WR_LOCAL_INV, |
|
.wr_cqe = &req->inv_cqe, |
|
.send_flags = IB_SEND_SIGNALED, |
|
.ex.invalidate_rkey = req->mr->rkey, |
|
}; |
|
req->inv_cqe.done = rtrs_clt_inv_rkey_done; |
|
|
|
return ib_post_send(con->c.qp, &wr, NULL); |
|
} |
|
|
|
static void complete_rdma_req(struct rtrs_clt_io_req *req, int errno, |
|
bool notify, bool can_wait) |
|
{ |
|
struct rtrs_clt_con *con = req->con; |
|
struct rtrs_clt_sess *sess; |
|
int err; |
|
|
|
if (WARN_ON(!req->in_use)) |
|
return; |
|
if (WARN_ON(!req->con)) |
|
return; |
|
sess = to_clt_sess(con->c.sess); |
|
|
|
if (req->sg_cnt) { |
|
if (unlikely(req->dir == DMA_FROM_DEVICE && req->need_inv)) { |
|
/* |
|
* We are here to invalidate read requests |
|
* ourselves. In normal scenario server should |
|
* send INV for all read requests, but |
|
* we are here, thus two things could happen: |
|
* |
|
* 1. this is failover, when errno != 0 |
|
* and can_wait == 1, |
|
* |
|
* 2. something totally bad happened and |
|
* server forgot to send INV, so we |
|
* should do that ourselves. |
|
*/ |
|
|
|
if (likely(can_wait)) { |
|
req->need_inv_comp = true; |
|
} else { |
|
/* This should be IO path, so always notify */ |
|
WARN_ON(!notify); |
|
/* Save errno for INV callback */ |
|
req->inv_errno = errno; |
|
} |
|
|
|
err = rtrs_inv_rkey(req); |
|
if (unlikely(err)) { |
|
rtrs_err(con->c.sess, "Send INV WR key=%#x: %d\n", |
|
req->mr->rkey, err); |
|
} else if (likely(can_wait)) { |
|
wait_for_completion(&req->inv_comp); |
|
} else { |
|
/* |
|
* Something went wrong, so request will be |
|
* completed from INV callback. |
|
*/ |
|
WARN_ON_ONCE(1); |
|
|
|
return; |
|
} |
|
} |
|
ib_dma_unmap_sg(sess->s.dev->ib_dev, req->sglist, |
|
req->sg_cnt, req->dir); |
|
} |
|
if (sess->clt->mp_policy == MP_POLICY_MIN_INFLIGHT) |
|
atomic_dec(&sess->stats->inflight); |
|
|
|
req->in_use = false; |
|
req->con = NULL; |
|
|
|
if (notify) |
|
req->conf(req->priv, errno); |
|
} |
|
|
|
static int rtrs_post_send_rdma(struct rtrs_clt_con *con, |
|
struct rtrs_clt_io_req *req, |
|
struct rtrs_rbuf *rbuf, u32 off, |
|
u32 imm, struct ib_send_wr *wr) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
enum ib_send_flags flags; |
|
struct ib_sge sge; |
|
|
|
if (unlikely(!req->sg_size)) { |
|
rtrs_wrn(con->c.sess, |
|
"Doing RDMA Write failed, no data supplied\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* user data and user message in the first list element */ |
|
sge.addr = req->iu->dma_addr; |
|
sge.length = req->sg_size; |
|
sge.lkey = sess->s.dev->ib_pd->local_dma_lkey; |
|
|
|
/* |
|
* 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->io_cnt) % sess->queue_depth ? |
|
0 : IB_SEND_SIGNALED; |
|
|
|
ib_dma_sync_single_for_device(sess->s.dev->ib_dev, req->iu->dma_addr, |
|
req->sg_size, DMA_TO_DEVICE); |
|
|
|
return rtrs_iu_post_rdma_write_imm(&con->c, req->iu, &sge, 1, |
|
rbuf->rkey, rbuf->addr + off, |
|
imm, flags, wr); |
|
} |
|
|
|
static void process_io_rsp(struct rtrs_clt_sess *sess, u32 msg_id, |
|
s16 errno, bool w_inval) |
|
{ |
|
struct rtrs_clt_io_req *req; |
|
|
|
if (WARN_ON(msg_id >= sess->queue_depth)) |
|
return; |
|
|
|
req = &sess->reqs[msg_id]; |
|
/* Drop need_inv if server responded with send with invalidation */ |
|
req->need_inv &= !w_inval; |
|
complete_rdma_req(req, errno, true, false); |
|
} |
|
|
|
static void rtrs_clt_recv_done(struct rtrs_clt_con *con, struct ib_wc *wc) |
|
{ |
|
struct rtrs_iu *iu; |
|
int err; |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
|
|
WARN_ON((sess->flags & RTRS_MSG_NEW_RKEY_F) == 0); |
|
iu = container_of(wc->wr_cqe, struct rtrs_iu, |
|
cqe); |
|
err = rtrs_iu_post_recv(&con->c, iu); |
|
if (unlikely(err)) { |
|
rtrs_err(con->c.sess, "post iu failed %d\n", err); |
|
rtrs_rdma_error_recovery(con); |
|
} |
|
} |
|
|
|
static void rtrs_clt_rkey_rsp_done(struct rtrs_clt_con *con, struct ib_wc *wc) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
struct rtrs_msg_rkey_rsp *msg; |
|
u32 imm_type, imm_payload; |
|
bool w_inval = false; |
|
struct rtrs_iu *iu; |
|
u32 buf_id; |
|
int err; |
|
|
|
WARN_ON((sess->flags & RTRS_MSG_NEW_RKEY_F) == 0); |
|
|
|
iu = container_of(wc->wr_cqe, struct rtrs_iu, cqe); |
|
|
|
if (unlikely(wc->byte_len < sizeof(*msg))) { |
|
rtrs_err(con->c.sess, "rkey response is malformed: size %d\n", |
|
wc->byte_len); |
|
goto out; |
|
} |
|
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_RKEY_RSP)) { |
|
rtrs_err(sess->clt, "rkey response is malformed: type %d\n", |
|
le16_to_cpu(msg->type)); |
|
goto out; |
|
} |
|
buf_id = le16_to_cpu(msg->buf_id); |
|
if (WARN_ON(buf_id >= sess->queue_depth)) |
|
goto out; |
|
|
|
rtrs_from_imm(be32_to_cpu(wc->ex.imm_data), &imm_type, &imm_payload); |
|
if (likely(imm_type == RTRS_IO_RSP_IMM || |
|
imm_type == RTRS_IO_RSP_W_INV_IMM)) { |
|
u32 msg_id; |
|
|
|
w_inval = (imm_type == RTRS_IO_RSP_W_INV_IMM); |
|
rtrs_from_io_rsp_imm(imm_payload, &msg_id, &err); |
|
|
|
if (WARN_ON(buf_id != msg_id)) |
|
goto out; |
|
sess->rbufs[buf_id].rkey = le32_to_cpu(msg->rkey); |
|
process_io_rsp(sess, msg_id, err, w_inval); |
|
} |
|
ib_dma_sync_single_for_device(sess->s.dev->ib_dev, iu->dma_addr, |
|
iu->size, DMA_FROM_DEVICE); |
|
return rtrs_clt_recv_done(con, wc); |
|
out: |
|
rtrs_rdma_error_recovery(con); |
|
} |
|
|
|
static void rtrs_clt_rdma_done(struct ib_cq *cq, struct ib_wc *wc); |
|
|
|
static struct ib_cqe io_comp_cqe = { |
|
.done = rtrs_clt_rdma_done |
|
}; |
|
|
|
/* |
|
* Post x2 empty WRs: first is for this RDMA with IMM, |
|
* second is for RECV with INV, which happened earlier. |
|
*/ |
|
static int rtrs_post_recv_empty_x2(struct rtrs_con *con, struct ib_cqe *cqe) |
|
{ |
|
struct ib_recv_wr wr_arr[2], *wr; |
|
int i; |
|
|
|
memset(wr_arr, 0, sizeof(wr_arr)); |
|
for (i = 0; i < ARRAY_SIZE(wr_arr); i++) { |
|
wr = &wr_arr[i]; |
|
wr->wr_cqe = cqe; |
|
if (i) |
|
/* Chain backwards */ |
|
wr->next = &wr_arr[i - 1]; |
|
} |
|
|
|
return ib_post_recv(con->qp, wr, NULL); |
|
} |
|
|
|
static void rtrs_clt_rdma_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct rtrs_clt_con *con = cq->cq_context; |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
u32 imm_type, imm_payload; |
|
bool w_inval = false; |
|
int err; |
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) { |
|
if (wc->status != IB_WC_WR_FLUSH_ERR) { |
|
rtrs_err(sess->clt, "RDMA failed: %s\n", |
|
ib_wc_status_msg(wc->status)); |
|
rtrs_rdma_error_recovery(con); |
|
} |
|
return; |
|
} |
|
rtrs_clt_update_wc_stats(con); |
|
|
|
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->done != rtrs_clt_rdma_done)) |
|
return; |
|
rtrs_from_imm(be32_to_cpu(wc->ex.imm_data), |
|
&imm_type, &imm_payload); |
|
if (likely(imm_type == RTRS_IO_RSP_IMM || |
|
imm_type == RTRS_IO_RSP_W_INV_IMM)) { |
|
u32 msg_id; |
|
|
|
w_inval = (imm_type == RTRS_IO_RSP_W_INV_IMM); |
|
rtrs_from_io_rsp_imm(imm_payload, &msg_id, &err); |
|
|
|
process_io_rsp(sess, msg_id, err, w_inval); |
|
} else if (imm_type == RTRS_HB_MSG_IMM) { |
|
WARN_ON(con->c.cid); |
|
rtrs_send_hb_ack(&sess->s); |
|
if (sess->flags & RTRS_MSG_NEW_RKEY_F) |
|
return rtrs_clt_recv_done(con, wc); |
|
} else if (imm_type == RTRS_HB_ACK_IMM) { |
|
WARN_ON(con->c.cid); |
|
sess->s.hb_missed_cnt = 0; |
|
if (sess->flags & RTRS_MSG_NEW_RKEY_F) |
|
return rtrs_clt_recv_done(con, wc); |
|
} else { |
|
rtrs_wrn(con->c.sess, "Unknown IMM type %u\n", |
|
imm_type); |
|
} |
|
if (w_inval) |
|
/* |
|
* Post x2 empty WRs: first is for this RDMA with IMM, |
|
* second is for RECV with INV, which happened earlier. |
|
*/ |
|
err = rtrs_post_recv_empty_x2(&con->c, &io_comp_cqe); |
|
else |
|
err = rtrs_post_recv_empty(&con->c, &io_comp_cqe); |
|
if (unlikely(err)) { |
|
rtrs_err(con->c.sess, "rtrs_post_recv_empty(): %d\n", |
|
err); |
|
rtrs_rdma_error_recovery(con); |
|
break; |
|
} |
|
break; |
|
case IB_WC_RECV: |
|
/* |
|
* Key invalidations from server side |
|
*/ |
|
WARN_ON(!(wc->wc_flags & IB_WC_WITH_INVALIDATE || |
|
wc->wc_flags & IB_WC_WITH_IMM)); |
|
WARN_ON(wc->wr_cqe->done != rtrs_clt_rdma_done); |
|
if (sess->flags & RTRS_MSG_NEW_RKEY_F) { |
|
if (wc->wc_flags & IB_WC_WITH_INVALIDATE) |
|
return rtrs_clt_recv_done(con, wc); |
|
|
|
return rtrs_clt_rkey_rsp_done(con, wc); |
|
} |
|
break; |
|
case IB_WC_RDMA_WRITE: |
|
/* |
|
* post_send() RDMA write completions of IO reqs (read/write) |
|
*/ |
|
break; |
|
|
|
default: |
|
rtrs_wrn(sess->clt, "Unexpected WC type: %d\n", wc->opcode); |
|
return; |
|
} |
|
} |
|
|
|
static int post_recv_io(struct rtrs_clt_con *con, size_t q_size) |
|
{ |
|
int err, i; |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
|
|
for (i = 0; i < q_size; i++) { |
|
if (sess->flags & RTRS_MSG_NEW_RKEY_F) { |
|
struct rtrs_iu *iu = &con->rsp_ius[i]; |
|
|
|
err = rtrs_iu_post_recv(&con->c, iu); |
|
} else { |
|
err = rtrs_post_recv_empty(&con->c, &io_comp_cqe); |
|
} |
|
if (unlikely(err)) |
|
return err; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int post_recv_sess(struct rtrs_clt_sess *sess) |
|
{ |
|
size_t q_size = 0; |
|
int err, cid; |
|
|
|
for (cid = 0; cid < sess->s.con_num; cid++) { |
|
if (cid == 0) |
|
q_size = SERVICE_CON_QUEUE_DEPTH; |
|
else |
|
q_size = sess->queue_depth; |
|
|
|
/* |
|
* x2 for RDMA read responses + FR key invalidations, |
|
* RDMA writes do not require any FR registrations. |
|
*/ |
|
q_size *= 2; |
|
|
|
err = post_recv_io(to_clt_con(sess->s.con[cid]), q_size); |
|
if (unlikely(err)) { |
|
rtrs_err(sess->clt, "post_recv_io(), err: %d\n", err); |
|
return err; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
struct path_it { |
|
int i; |
|
struct list_head skip_list; |
|
struct rtrs_clt *clt; |
|
struct rtrs_clt_sess *(*next_path)(struct path_it *it); |
|
}; |
|
|
|
/** |
|
* list_next_or_null_rr_rcu - get next list element in round-robin fashion. |
|
* @head: the head for the list. |
|
* @ptr: the list head to take the next element from. |
|
* @type: the type of the struct this is embedded in. |
|
* @memb: the name of the list_head within the struct. |
|
* |
|
* Next element returned in round-robin fashion, i.e. head will be skipped, |
|
* but if list is observed as empty, NULL will be returned. |
|
* |
|
* This primitive may safely run concurrently with the _rcu list-mutation |
|
* primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock(). |
|
*/ |
|
#define list_next_or_null_rr_rcu(head, ptr, type, memb) \ |
|
({ \ |
|
list_next_or_null_rcu(head, ptr, type, memb) ?: \ |
|
list_next_or_null_rcu(head, READ_ONCE((ptr)->next), \ |
|
type, memb); \ |
|
}) |
|
|
|
/** |
|
* get_next_path_rr() - Returns path in round-robin fashion. |
|
* @it: the path pointer |
|
* |
|
* Related to @MP_POLICY_RR |
|
* |
|
* Locks: |
|
* rcu_read_lock() must be hold. |
|
*/ |
|
static struct rtrs_clt_sess *get_next_path_rr(struct path_it *it) |
|
{ |
|
struct rtrs_clt_sess __rcu **ppcpu_path; |
|
struct rtrs_clt_sess *path; |
|
struct rtrs_clt *clt; |
|
|
|
clt = it->clt; |
|
|
|
/* |
|
* Here we use two RCU objects: @paths_list and @pcpu_path |
|
* pointer. See rtrs_clt_remove_path_from_arr() for details |
|
* how that is handled. |
|
*/ |
|
|
|
ppcpu_path = this_cpu_ptr(clt->pcpu_path); |
|
path = rcu_dereference(*ppcpu_path); |
|
if (unlikely(!path)) |
|
path = list_first_or_null_rcu(&clt->paths_list, |
|
typeof(*path), s.entry); |
|
else |
|
path = list_next_or_null_rr_rcu(&clt->paths_list, |
|
&path->s.entry, |
|
typeof(*path), |
|
s.entry); |
|
rcu_assign_pointer(*ppcpu_path, path); |
|
|
|
return path; |
|
} |
|
|
|
/** |
|
* get_next_path_min_inflight() - Returns path with minimal inflight count. |
|
* @it: the path pointer |
|
* |
|
* Related to @MP_POLICY_MIN_INFLIGHT |
|
* |
|
* Locks: |
|
* rcu_read_lock() must be hold. |
|
*/ |
|
static struct rtrs_clt_sess *get_next_path_min_inflight(struct path_it *it) |
|
{ |
|
struct rtrs_clt_sess *min_path = NULL; |
|
struct rtrs_clt *clt = it->clt; |
|
struct rtrs_clt_sess *sess; |
|
int min_inflight = INT_MAX; |
|
int inflight; |
|
|
|
list_for_each_entry_rcu(sess, &clt->paths_list, s.entry) { |
|
if (unlikely(!list_empty(raw_cpu_ptr(sess->mp_skip_entry)))) |
|
continue; |
|
|
|
inflight = atomic_read(&sess->stats->inflight); |
|
|
|
if (inflight < min_inflight) { |
|
min_inflight = inflight; |
|
min_path = sess; |
|
} |
|
} |
|
|
|
/* |
|
* add the path to the skip list, so that next time we can get |
|
* a different one |
|
*/ |
|
if (min_path) |
|
list_add(raw_cpu_ptr(min_path->mp_skip_entry), &it->skip_list); |
|
|
|
return min_path; |
|
} |
|
|
|
static inline void path_it_init(struct path_it *it, struct rtrs_clt *clt) |
|
{ |
|
INIT_LIST_HEAD(&it->skip_list); |
|
it->clt = clt; |
|
it->i = 0; |
|
|
|
if (clt->mp_policy == MP_POLICY_RR) |
|
it->next_path = get_next_path_rr; |
|
else |
|
it->next_path = get_next_path_min_inflight; |
|
} |
|
|
|
static inline void path_it_deinit(struct path_it *it) |
|
{ |
|
struct list_head *skip, *tmp; |
|
/* |
|
* The skip_list is used only for the MIN_INFLIGHT policy. |
|
* We need to remove paths from it, so that next IO can insert |
|
* paths (->mp_skip_entry) into a skip_list again. |
|
*/ |
|
list_for_each_safe(skip, tmp, &it->skip_list) |
|
list_del_init(skip); |
|
} |
|
|
|
/** |
|
* rtrs_clt_init_req() Initialize an rtrs_clt_io_req holding information |
|
* about an inflight IO. |
|
* The user buffer holding user control message (not data) is copied into |
|
* the corresponding buffer of rtrs_iu (req->iu->buf), which later on will |
|
* also hold the control message of rtrs. |
|
* @req: an io request holding information about IO. |
|
* @sess: client session |
|
* @conf: conformation callback function to notify upper layer. |
|
* @permit: permit for allocation of RDMA remote buffer |
|
* @priv: private pointer |
|
* @vec: kernel vector containing control message |
|
* @usr_len: length of the user message |
|
* @sg: scater list for IO data |
|
* @sg_cnt: number of scater list entries |
|
* @data_len: length of the IO data |
|
* @dir: direction of the IO. |
|
*/ |
|
static void rtrs_clt_init_req(struct rtrs_clt_io_req *req, |
|
struct rtrs_clt_sess *sess, |
|
void (*conf)(void *priv, int errno), |
|
struct rtrs_permit *permit, void *priv, |
|
const struct kvec *vec, size_t usr_len, |
|
struct scatterlist *sg, size_t sg_cnt, |
|
size_t data_len, int dir) |
|
{ |
|
struct iov_iter iter; |
|
size_t len; |
|
|
|
req->permit = permit; |
|
req->in_use = true; |
|
req->usr_len = usr_len; |
|
req->data_len = data_len; |
|
req->sglist = sg; |
|
req->sg_cnt = sg_cnt; |
|
req->priv = priv; |
|
req->dir = dir; |
|
req->con = rtrs_permit_to_clt_con(sess, permit); |
|
req->conf = conf; |
|
req->need_inv = false; |
|
req->need_inv_comp = false; |
|
req->inv_errno = 0; |
|
|
|
iov_iter_kvec(&iter, READ, vec, 1, usr_len); |
|
len = _copy_from_iter(req->iu->buf, usr_len, &iter); |
|
WARN_ON(len != usr_len); |
|
|
|
reinit_completion(&req->inv_comp); |
|
} |
|
|
|
static struct rtrs_clt_io_req * |
|
rtrs_clt_get_req(struct rtrs_clt_sess *sess, |
|
void (*conf)(void *priv, int errno), |
|
struct rtrs_permit *permit, void *priv, |
|
const struct kvec *vec, size_t usr_len, |
|
struct scatterlist *sg, size_t sg_cnt, |
|
size_t data_len, int dir) |
|
{ |
|
struct rtrs_clt_io_req *req; |
|
|
|
req = &sess->reqs[permit->mem_id]; |
|
rtrs_clt_init_req(req, sess, conf, permit, priv, vec, usr_len, |
|
sg, sg_cnt, data_len, dir); |
|
return req; |
|
} |
|
|
|
static struct rtrs_clt_io_req * |
|
rtrs_clt_get_copy_req(struct rtrs_clt_sess *alive_sess, |
|
struct rtrs_clt_io_req *fail_req) |
|
{ |
|
struct rtrs_clt_io_req *req; |
|
struct kvec vec = { |
|
.iov_base = fail_req->iu->buf, |
|
.iov_len = fail_req->usr_len |
|
}; |
|
|
|
req = &alive_sess->reqs[fail_req->permit->mem_id]; |
|
rtrs_clt_init_req(req, alive_sess, fail_req->conf, fail_req->permit, |
|
fail_req->priv, &vec, fail_req->usr_len, |
|
fail_req->sglist, fail_req->sg_cnt, |
|
fail_req->data_len, fail_req->dir); |
|
return req; |
|
} |
|
|
|
static int rtrs_post_rdma_write_sg(struct rtrs_clt_con *con, |
|
struct rtrs_clt_io_req *req, |
|
struct rtrs_rbuf *rbuf, |
|
u32 size, u32 imm) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
struct ib_sge *sge = req->sge; |
|
enum ib_send_flags flags; |
|
struct scatterlist *sg; |
|
size_t num_sge; |
|
int i; |
|
|
|
for_each_sg(req->sglist, sg, req->sg_cnt, i) { |
|
sge[i].addr = sg_dma_address(sg); |
|
sge[i].length = sg_dma_len(sg); |
|
sge[i].lkey = sess->s.dev->ib_pd->local_dma_lkey; |
|
} |
|
sge[i].addr = req->iu->dma_addr; |
|
sge[i].length = size; |
|
sge[i].lkey = sess->s.dev->ib_pd->local_dma_lkey; |
|
|
|
num_sge = 1 + req->sg_cnt; |
|
|
|
/* |
|
* 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->io_cnt) % sess->queue_depth ? |
|
0 : IB_SEND_SIGNALED; |
|
|
|
ib_dma_sync_single_for_device(sess->s.dev->ib_dev, req->iu->dma_addr, |
|
size, DMA_TO_DEVICE); |
|
|
|
return rtrs_iu_post_rdma_write_imm(&con->c, req->iu, sge, num_sge, |
|
rbuf->rkey, rbuf->addr, imm, |
|
flags, NULL); |
|
} |
|
|
|
static int rtrs_clt_write_req(struct rtrs_clt_io_req *req) |
|
{ |
|
struct rtrs_clt_con *con = req->con; |
|
struct rtrs_sess *s = con->c.sess; |
|
struct rtrs_clt_sess *sess = to_clt_sess(s); |
|
struct rtrs_msg_rdma_write *msg; |
|
|
|
struct rtrs_rbuf *rbuf; |
|
int ret, count = 0; |
|
u32 imm, buf_id; |
|
|
|
const size_t tsize = sizeof(*msg) + req->data_len + req->usr_len; |
|
|
|
if (unlikely(tsize > sess->chunk_size)) { |
|
rtrs_wrn(s, "Write request failed, size too big %zu > %d\n", |
|
tsize, sess->chunk_size); |
|
return -EMSGSIZE; |
|
} |
|
if (req->sg_cnt) { |
|
count = ib_dma_map_sg(sess->s.dev->ib_dev, req->sglist, |
|
req->sg_cnt, req->dir); |
|
if (unlikely(!count)) { |
|
rtrs_wrn(s, "Write request failed, map failed\n"); |
|
return -EINVAL; |
|
} |
|
} |
|
/* put rtrs msg after sg and user message */ |
|
msg = req->iu->buf + req->usr_len; |
|
msg->type = cpu_to_le16(RTRS_MSG_WRITE); |
|
msg->usr_len = cpu_to_le16(req->usr_len); |
|
|
|
/* rtrs message on server side will be after user data and message */ |
|
imm = req->permit->mem_off + req->data_len + req->usr_len; |
|
imm = rtrs_to_io_req_imm(imm); |
|
buf_id = req->permit->mem_id; |
|
req->sg_size = tsize; |
|
rbuf = &sess->rbufs[buf_id]; |
|
|
|
/* |
|
* Update stats now, after request is successfully sent it is not |
|
* safe anymore to touch it. |
|
*/ |
|
rtrs_clt_update_all_stats(req, WRITE); |
|
|
|
ret = rtrs_post_rdma_write_sg(req->con, req, rbuf, |
|
req->usr_len + sizeof(*msg), |
|
imm); |
|
if (unlikely(ret)) { |
|
rtrs_err(s, "Write request failed: %d\n", ret); |
|
if (sess->clt->mp_policy == MP_POLICY_MIN_INFLIGHT) |
|
atomic_dec(&sess->stats->inflight); |
|
if (req->sg_cnt) |
|
ib_dma_unmap_sg(sess->s.dev->ib_dev, req->sglist, |
|
req->sg_cnt, req->dir); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int rtrs_map_sg_fr(struct rtrs_clt_io_req *req, size_t count) |
|
{ |
|
int nr; |
|
|
|
/* Align the MR to a 4K page size to match the block virt boundary */ |
|
nr = ib_map_mr_sg(req->mr, req->sglist, count, NULL, SZ_4K); |
|
if (nr < 0) |
|
return nr; |
|
if (unlikely(nr < req->sg_cnt)) |
|
return -EINVAL; |
|
ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey)); |
|
|
|
return nr; |
|
} |
|
|
|
static int rtrs_clt_read_req(struct rtrs_clt_io_req *req) |
|
{ |
|
struct rtrs_clt_con *con = req->con; |
|
struct rtrs_sess *s = con->c.sess; |
|
struct rtrs_clt_sess *sess = to_clt_sess(s); |
|
struct rtrs_msg_rdma_read *msg; |
|
struct rtrs_ib_dev *dev; |
|
|
|
struct ib_reg_wr rwr; |
|
struct ib_send_wr *wr = NULL; |
|
|
|
int ret, count = 0; |
|
u32 imm, buf_id; |
|
|
|
const size_t tsize = sizeof(*msg) + req->data_len + req->usr_len; |
|
|
|
s = &sess->s; |
|
dev = sess->s.dev; |
|
|
|
if (unlikely(tsize > sess->chunk_size)) { |
|
rtrs_wrn(s, |
|
"Read request failed, message size is %zu, bigger than CHUNK_SIZE %d\n", |
|
tsize, sess->chunk_size); |
|
return -EMSGSIZE; |
|
} |
|
|
|
if (req->sg_cnt) { |
|
count = ib_dma_map_sg(dev->ib_dev, req->sglist, req->sg_cnt, |
|
req->dir); |
|
if (unlikely(!count)) { |
|
rtrs_wrn(s, |
|
"Read request failed, dma map failed\n"); |
|
return -EINVAL; |
|
} |
|
} |
|
/* put our message into req->buf after user message*/ |
|
msg = req->iu->buf + req->usr_len; |
|
msg->type = cpu_to_le16(RTRS_MSG_READ); |
|
msg->usr_len = cpu_to_le16(req->usr_len); |
|
|
|
if (count) { |
|
ret = rtrs_map_sg_fr(req, count); |
|
if (ret < 0) { |
|
rtrs_err_rl(s, |
|
"Read request failed, failed to map fast reg. data, err: %d\n", |
|
ret); |
|
ib_dma_unmap_sg(dev->ib_dev, req->sglist, req->sg_cnt, |
|
req->dir); |
|
return ret; |
|
} |
|
rwr = (struct ib_reg_wr) { |
|
.wr.opcode = IB_WR_REG_MR, |
|
.wr.wr_cqe = &fast_reg_cqe, |
|
.mr = req->mr, |
|
.key = req->mr->rkey, |
|
.access = (IB_ACCESS_LOCAL_WRITE | |
|
IB_ACCESS_REMOTE_WRITE), |
|
}; |
|
wr = &rwr.wr; |
|
|
|
msg->sg_cnt = cpu_to_le16(1); |
|
msg->flags = cpu_to_le16(RTRS_MSG_NEED_INVAL_F); |
|
|
|
msg->desc[0].addr = cpu_to_le64(req->mr->iova); |
|
msg->desc[0].key = cpu_to_le32(req->mr->rkey); |
|
msg->desc[0].len = cpu_to_le32(req->mr->length); |
|
|
|
/* Further invalidation is required */ |
|
req->need_inv = !!RTRS_MSG_NEED_INVAL_F; |
|
|
|
} else { |
|
msg->sg_cnt = 0; |
|
msg->flags = 0; |
|
} |
|
/* |
|
* rtrs message will be after the space reserved for disk data and |
|
* user message |
|
*/ |
|
imm = req->permit->mem_off + req->data_len + req->usr_len; |
|
imm = rtrs_to_io_req_imm(imm); |
|
buf_id = req->permit->mem_id; |
|
|
|
req->sg_size = sizeof(*msg); |
|
req->sg_size += le16_to_cpu(msg->sg_cnt) * sizeof(struct rtrs_sg_desc); |
|
req->sg_size += req->usr_len; |
|
|
|
/* |
|
* Update stats now, after request is successfully sent it is not |
|
* safe anymore to touch it. |
|
*/ |
|
rtrs_clt_update_all_stats(req, READ); |
|
|
|
ret = rtrs_post_send_rdma(req->con, req, &sess->rbufs[buf_id], |
|
req->data_len, imm, wr); |
|
if (unlikely(ret)) { |
|
rtrs_err(s, "Read request failed: %d\n", ret); |
|
if (sess->clt->mp_policy == MP_POLICY_MIN_INFLIGHT) |
|
atomic_dec(&sess->stats->inflight); |
|
req->need_inv = false; |
|
if (req->sg_cnt) |
|
ib_dma_unmap_sg(dev->ib_dev, req->sglist, |
|
req->sg_cnt, req->dir); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* rtrs_clt_failover_req() Try to find an active path for a failed request |
|
* @clt: clt context |
|
* @fail_req: a failed io request. |
|
*/ |
|
static int rtrs_clt_failover_req(struct rtrs_clt *clt, |
|
struct rtrs_clt_io_req *fail_req) |
|
{ |
|
struct rtrs_clt_sess *alive_sess; |
|
struct rtrs_clt_io_req *req; |
|
int err = -ECONNABORTED; |
|
struct path_it it; |
|
|
|
rcu_read_lock(); |
|
for (path_it_init(&it, clt); |
|
(alive_sess = it.next_path(&it)) && it.i < it.clt->paths_num; |
|
it.i++) { |
|
if (unlikely(READ_ONCE(alive_sess->state) != |
|
RTRS_CLT_CONNECTED)) |
|
continue; |
|
req = rtrs_clt_get_copy_req(alive_sess, fail_req); |
|
if (req->dir == DMA_TO_DEVICE) |
|
err = rtrs_clt_write_req(req); |
|
else |
|
err = rtrs_clt_read_req(req); |
|
if (unlikely(err)) { |
|
req->in_use = false; |
|
continue; |
|
} |
|
/* Success path */ |
|
rtrs_clt_inc_failover_cnt(alive_sess->stats); |
|
break; |
|
} |
|
path_it_deinit(&it); |
|
rcu_read_unlock(); |
|
|
|
return err; |
|
} |
|
|
|
static void fail_all_outstanding_reqs(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt *clt = sess->clt; |
|
struct rtrs_clt_io_req *req; |
|
int i, err; |
|
|
|
if (!sess->reqs) |
|
return; |
|
for (i = 0; i < sess->queue_depth; ++i) { |
|
req = &sess->reqs[i]; |
|
if (!req->in_use) |
|
continue; |
|
|
|
/* |
|
* Safely (without notification) complete failed request. |
|
* After completion this request is still useble and can |
|
* be failovered to another path. |
|
*/ |
|
complete_rdma_req(req, -ECONNABORTED, false, true); |
|
|
|
err = rtrs_clt_failover_req(clt, req); |
|
if (unlikely(err)) |
|
/* Failover failed, notify anyway */ |
|
req->conf(req->priv, err); |
|
} |
|
} |
|
|
|
static void free_sess_reqs(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt_io_req *req; |
|
int i; |
|
|
|
if (!sess->reqs) |
|
return; |
|
for (i = 0; i < sess->queue_depth; ++i) { |
|
req = &sess->reqs[i]; |
|
if (req->mr) |
|
ib_dereg_mr(req->mr); |
|
kfree(req->sge); |
|
rtrs_iu_free(req->iu, sess->s.dev->ib_dev, 1); |
|
} |
|
kfree(sess->reqs); |
|
sess->reqs = NULL; |
|
} |
|
|
|
static int alloc_sess_reqs(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt_io_req *req; |
|
struct rtrs_clt *clt = sess->clt; |
|
int i, err = -ENOMEM; |
|
|
|
sess->reqs = kcalloc(sess->queue_depth, sizeof(*sess->reqs), |
|
GFP_KERNEL); |
|
if (!sess->reqs) |
|
return -ENOMEM; |
|
|
|
for (i = 0; i < sess->queue_depth; ++i) { |
|
req = &sess->reqs[i]; |
|
req->iu = rtrs_iu_alloc(1, sess->max_hdr_size, GFP_KERNEL, |
|
sess->s.dev->ib_dev, |
|
DMA_TO_DEVICE, |
|
rtrs_clt_rdma_done); |
|
if (!req->iu) |
|
goto out; |
|
|
|
req->sge = kmalloc_array(clt->max_segments + 1, |
|
sizeof(*req->sge), GFP_KERNEL); |
|
if (!req->sge) |
|
goto out; |
|
|
|
req->mr = ib_alloc_mr(sess->s.dev->ib_pd, IB_MR_TYPE_MEM_REG, |
|
sess->max_pages_per_mr); |
|
if (IS_ERR(req->mr)) { |
|
err = PTR_ERR(req->mr); |
|
req->mr = NULL; |
|
pr_err("Failed to alloc sess->max_pages_per_mr %d\n", |
|
sess->max_pages_per_mr); |
|
goto out; |
|
} |
|
|
|
init_completion(&req->inv_comp); |
|
} |
|
|
|
return 0; |
|
|
|
out: |
|
free_sess_reqs(sess); |
|
|
|
return err; |
|
} |
|
|
|
static int alloc_permits(struct rtrs_clt *clt) |
|
{ |
|
unsigned int chunk_bits; |
|
int err, i; |
|
|
|
clt->permits_map = kcalloc(BITS_TO_LONGS(clt->queue_depth), |
|
sizeof(long), GFP_KERNEL); |
|
if (!clt->permits_map) { |
|
err = -ENOMEM; |
|
goto out_err; |
|
} |
|
clt->permits = kcalloc(clt->queue_depth, permit_size(clt), GFP_KERNEL); |
|
if (!clt->permits) { |
|
err = -ENOMEM; |
|
goto err_map; |
|
} |
|
chunk_bits = ilog2(clt->queue_depth - 1) + 1; |
|
for (i = 0; i < clt->queue_depth; i++) { |
|
struct rtrs_permit *permit; |
|
|
|
permit = get_permit(clt, i); |
|
permit->mem_id = i; |
|
permit->mem_off = i << (MAX_IMM_PAYL_BITS - chunk_bits); |
|
} |
|
|
|
return 0; |
|
|
|
err_map: |
|
kfree(clt->permits_map); |
|
clt->permits_map = NULL; |
|
out_err: |
|
return err; |
|
} |
|
|
|
static void free_permits(struct rtrs_clt *clt) |
|
{ |
|
if (clt->permits_map) { |
|
size_t sz = clt->queue_depth; |
|
|
|
wait_event(clt->permits_wait, |
|
find_first_bit(clt->permits_map, sz) >= sz); |
|
} |
|
kfree(clt->permits_map); |
|
clt->permits_map = NULL; |
|
kfree(clt->permits); |
|
clt->permits = NULL; |
|
} |
|
|
|
static void query_fast_reg_mode(struct rtrs_clt_sess *sess) |
|
{ |
|
struct ib_device *ib_dev; |
|
u64 max_pages_per_mr; |
|
int mr_page_shift; |
|
|
|
ib_dev = sess->s.dev->ib_dev; |
|
|
|
/* |
|
* Use the smallest page size supported by the HCA, down to a |
|
* minimum of 4096 bytes. We're unlikely to build large sglists |
|
* out of smaller entries. |
|
*/ |
|
mr_page_shift = max(12, ffs(ib_dev->attrs.page_size_cap) - 1); |
|
max_pages_per_mr = ib_dev->attrs.max_mr_size; |
|
do_div(max_pages_per_mr, (1ull << mr_page_shift)); |
|
sess->max_pages_per_mr = |
|
min3(sess->max_pages_per_mr, (u32)max_pages_per_mr, |
|
ib_dev->attrs.max_fast_reg_page_list_len); |
|
sess->max_send_sge = ib_dev->attrs.max_send_sge; |
|
} |
|
|
|
static bool rtrs_clt_change_state_get_old(struct rtrs_clt_sess *sess, |
|
enum rtrs_clt_state new_state, |
|
enum rtrs_clt_state *old_state) |
|
{ |
|
bool changed; |
|
|
|
spin_lock_irq(&sess->state_wq.lock); |
|
if (old_state) |
|
*old_state = sess->state; |
|
changed = rtrs_clt_change_state(sess, new_state); |
|
spin_unlock_irq(&sess->state_wq.lock); |
|
|
|
return changed; |
|
} |
|
|
|
static void rtrs_clt_hb_err_handler(struct rtrs_con *c) |
|
{ |
|
struct rtrs_clt_con *con = container_of(c, typeof(*con), c); |
|
|
|
rtrs_rdma_error_recovery(con); |
|
} |
|
|
|
static void rtrs_clt_init_hb(struct rtrs_clt_sess *sess) |
|
{ |
|
rtrs_init_hb(&sess->s, &io_comp_cqe, |
|
RTRS_HB_INTERVAL_MS, |
|
RTRS_HB_MISSED_MAX, |
|
rtrs_clt_hb_err_handler, |
|
rtrs_wq); |
|
} |
|
|
|
static void rtrs_clt_start_hb(struct rtrs_clt_sess *sess) |
|
{ |
|
rtrs_start_hb(&sess->s); |
|
} |
|
|
|
static void rtrs_clt_stop_hb(struct rtrs_clt_sess *sess) |
|
{ |
|
rtrs_stop_hb(&sess->s); |
|
} |
|
|
|
static void rtrs_clt_reconnect_work(struct work_struct *work); |
|
static void rtrs_clt_close_work(struct work_struct *work); |
|
|
|
static struct rtrs_clt_sess *alloc_sess(struct rtrs_clt *clt, |
|
const struct rtrs_addr *path, |
|
size_t con_num, u16 max_segments, |
|
size_t max_segment_size) |
|
{ |
|
struct rtrs_clt_sess *sess; |
|
int err = -ENOMEM; |
|
int cpu; |
|
|
|
sess = kzalloc(sizeof(*sess), GFP_KERNEL); |
|
if (!sess) |
|
goto err; |
|
|
|
/* Extra connection for user messages */ |
|
con_num += 1; |
|
|
|
sess->s.con = kcalloc(con_num, sizeof(*sess->s.con), GFP_KERNEL); |
|
if (!sess->s.con) |
|
goto err_free_sess; |
|
|
|
sess->stats = kzalloc(sizeof(*sess->stats), GFP_KERNEL); |
|
if (!sess->stats) |
|
goto err_free_con; |
|
|
|
mutex_init(&sess->init_mutex); |
|
uuid_gen(&sess->s.uuid); |
|
memcpy(&sess->s.dst_addr, path->dst, |
|
rdma_addr_size((struct sockaddr *)path->dst)); |
|
|
|
/* |
|
* rdma_resolve_addr() passes src_addr to cma_bind_addr, which |
|
* checks the sa_family to be non-zero. If user passed src_addr=NULL |
|
* the sess->src_addr will contain only zeros, which is then fine. |
|
*/ |
|
if (path->src) |
|
memcpy(&sess->s.src_addr, path->src, |
|
rdma_addr_size((struct sockaddr *)path->src)); |
|
strlcpy(sess->s.sessname, clt->sessname, sizeof(sess->s.sessname)); |
|
sess->s.con_num = con_num; |
|
sess->clt = clt; |
|
sess->max_pages_per_mr = max_segments * max_segment_size >> 12; |
|
init_waitqueue_head(&sess->state_wq); |
|
sess->state = RTRS_CLT_CONNECTING; |
|
atomic_set(&sess->connected_cnt, 0); |
|
INIT_WORK(&sess->close_work, rtrs_clt_close_work); |
|
INIT_DELAYED_WORK(&sess->reconnect_dwork, rtrs_clt_reconnect_work); |
|
rtrs_clt_init_hb(sess); |
|
|
|
sess->mp_skip_entry = alloc_percpu(typeof(*sess->mp_skip_entry)); |
|
if (!sess->mp_skip_entry) |
|
goto err_free_stats; |
|
|
|
for_each_possible_cpu(cpu) |
|
INIT_LIST_HEAD(per_cpu_ptr(sess->mp_skip_entry, cpu)); |
|
|
|
err = rtrs_clt_init_stats(sess->stats); |
|
if (err) |
|
goto err_free_percpu; |
|
|
|
return sess; |
|
|
|
err_free_percpu: |
|
free_percpu(sess->mp_skip_entry); |
|
err_free_stats: |
|
kfree(sess->stats); |
|
err_free_con: |
|
kfree(sess->s.con); |
|
err_free_sess: |
|
kfree(sess); |
|
err: |
|
return ERR_PTR(err); |
|
} |
|
|
|
void free_sess(struct rtrs_clt_sess *sess) |
|
{ |
|
free_percpu(sess->mp_skip_entry); |
|
mutex_destroy(&sess->init_mutex); |
|
kfree(sess->s.con); |
|
kfree(sess->rbufs); |
|
kfree(sess); |
|
} |
|
|
|
static int create_con(struct rtrs_clt_sess *sess, unsigned int cid) |
|
{ |
|
struct rtrs_clt_con *con; |
|
|
|
con = kzalloc(sizeof(*con), GFP_KERNEL); |
|
if (!con) |
|
return -ENOMEM; |
|
|
|
/* Map first two connections to the first CPU */ |
|
con->cpu = (cid ? cid - 1 : 0) % nr_cpu_ids; |
|
con->c.cid = cid; |
|
con->c.sess = &sess->s; |
|
atomic_set(&con->io_cnt, 0); |
|
mutex_init(&con->con_mutex); |
|
|
|
sess->s.con[cid] = &con->c; |
|
|
|
return 0; |
|
} |
|
|
|
static void destroy_con(struct rtrs_clt_con *con) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
|
|
sess->s.con[con->c.cid] = NULL; |
|
mutex_destroy(&con->con_mutex); |
|
kfree(con); |
|
} |
|
|
|
static int create_con_cq_qp(struct rtrs_clt_con *con) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
u32 max_send_wr, max_recv_wr, cq_size; |
|
int err, cq_vector; |
|
struct rtrs_msg_rkey_rsp *rsp; |
|
|
|
lockdep_assert_held(&con->con_mutex); |
|
if (con->c.cid == 0) { |
|
/* |
|
* One completion for each receive and two for each send |
|
* (send request + registration) |
|
* + 2 for drain and heartbeat |
|
* in case qp gets into error state |
|
*/ |
|
max_send_wr = SERVICE_CON_QUEUE_DEPTH * 2 + 2; |
|
max_recv_wr = SERVICE_CON_QUEUE_DEPTH * 2 + 2; |
|
/* We must be the first here */ |
|
if (WARN_ON(sess->s.dev)) |
|
return -EINVAL; |
|
|
|
/* |
|
* The whole session uses device from user connection. |
|
* Be careful not to close user connection before ib dev |
|
* is gracefully put. |
|
*/ |
|
sess->s.dev = rtrs_ib_dev_find_or_add(con->c.cm_id->device, |
|
&dev_pd); |
|
if (!sess->s.dev) { |
|
rtrs_wrn(sess->clt, |
|
"rtrs_ib_dev_find_get_or_add(): no memory\n"); |
|
return -ENOMEM; |
|
} |
|
sess->s.dev_ref = 1; |
|
query_fast_reg_mode(sess); |
|
} else { |
|
/* |
|
* Here we assume that session members are correctly set. |
|
* This is always true if user connection (cid == 0) is |
|
* established first. |
|
*/ |
|
if (WARN_ON(!sess->s.dev)) |
|
return -EINVAL; |
|
if (WARN_ON(!sess->queue_depth)) |
|
return -EINVAL; |
|
|
|
/* Shared between connections */ |
|
sess->s.dev_ref++; |
|
max_send_wr = |
|
min_t(int, sess->s.dev->ib_dev->attrs.max_qp_wr, |
|
/* QD * (REQ + RSP + FR REGS or INVS) + drain */ |
|
sess->queue_depth * 3 + 1); |
|
max_recv_wr = |
|
min_t(int, sess->s.dev->ib_dev->attrs.max_qp_wr, |
|
sess->queue_depth * 3 + 1); |
|
} |
|
/* alloc iu to recv new rkey reply when server reports flags set */ |
|
if (sess->flags & RTRS_MSG_NEW_RKEY_F || con->c.cid == 0) { |
|
con->rsp_ius = rtrs_iu_alloc(max_recv_wr, sizeof(*rsp), |
|
GFP_KERNEL, sess->s.dev->ib_dev, |
|
DMA_FROM_DEVICE, |
|
rtrs_clt_rdma_done); |
|
if (!con->rsp_ius) |
|
return -ENOMEM; |
|
con->queue_size = max_recv_wr; |
|
} |
|
cq_size = max_send_wr + max_recv_wr; |
|
cq_vector = con->cpu % sess->s.dev->ib_dev->num_comp_vectors; |
|
err = rtrs_cq_qp_create(&sess->s, &con->c, sess->max_send_sge, |
|
cq_vector, cq_size, max_send_wr, |
|
max_recv_wr, IB_POLL_SOFTIRQ); |
|
/* |
|
* In case of error we do not bother to clean previous allocations, |
|
* since destroy_con_cq_qp() must be called. |
|
*/ |
|
return err; |
|
} |
|
|
|
static void destroy_con_cq_qp(struct rtrs_clt_con *con) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
|
|
/* |
|
* Be careful here: destroy_con_cq_qp() can be called even |
|
* create_con_cq_qp() failed, see comments there. |
|
*/ |
|
lockdep_assert_held(&con->con_mutex); |
|
rtrs_cq_qp_destroy(&con->c); |
|
if (con->rsp_ius) { |
|
rtrs_iu_free(con->rsp_ius, sess->s.dev->ib_dev, con->queue_size); |
|
con->rsp_ius = NULL; |
|
con->queue_size = 0; |
|
} |
|
if (sess->s.dev_ref && !--sess->s.dev_ref) { |
|
rtrs_ib_dev_put(sess->s.dev); |
|
sess->s.dev = NULL; |
|
} |
|
} |
|
|
|
static void stop_cm(struct rtrs_clt_con *con) |
|
{ |
|
rdma_disconnect(con->c.cm_id); |
|
if (con->c.qp) |
|
ib_drain_qp(con->c.qp); |
|
} |
|
|
|
static void destroy_cm(struct rtrs_clt_con *con) |
|
{ |
|
rdma_destroy_id(con->c.cm_id); |
|
con->c.cm_id = NULL; |
|
} |
|
|
|
static int rtrs_rdma_addr_resolved(struct rtrs_clt_con *con) |
|
{ |
|
struct rtrs_sess *s = con->c.sess; |
|
int err; |
|
|
|
mutex_lock(&con->con_mutex); |
|
err = create_con_cq_qp(con); |
|
mutex_unlock(&con->con_mutex); |
|
if (err) { |
|
rtrs_err(s, "create_con_cq_qp(), err: %d\n", err); |
|
return err; |
|
} |
|
err = rdma_resolve_route(con->c.cm_id, RTRS_CONNECT_TIMEOUT_MS); |
|
if (err) |
|
rtrs_err(s, "Resolving route failed, err: %d\n", err); |
|
|
|
return err; |
|
} |
|
|
|
static int rtrs_rdma_route_resolved(struct rtrs_clt_con *con) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
struct rtrs_clt *clt = sess->clt; |
|
struct rtrs_msg_conn_req msg; |
|
struct rdma_conn_param param; |
|
|
|
int err; |
|
|
|
param = (struct rdma_conn_param) { |
|
.retry_count = 7, |
|
.rnr_retry_count = 7, |
|
.private_data = &msg, |
|
.private_data_len = sizeof(msg), |
|
}; |
|
|
|
msg = (struct rtrs_msg_conn_req) { |
|
.magic = cpu_to_le16(RTRS_MAGIC), |
|
.version = cpu_to_le16(RTRS_PROTO_VER), |
|
.cid = cpu_to_le16(con->c.cid), |
|
.cid_num = cpu_to_le16(sess->s.con_num), |
|
.recon_cnt = cpu_to_le16(sess->s.recon_cnt), |
|
}; |
|
msg.first_conn = sess->for_new_clt ? FIRST_CONN : 0; |
|
uuid_copy(&msg.sess_uuid, &sess->s.uuid); |
|
uuid_copy(&msg.paths_uuid, &clt->paths_uuid); |
|
|
|
err = rdma_connect_locked(con->c.cm_id, ¶m); |
|
if (err) |
|
rtrs_err(clt, "rdma_connect_locked(): %d\n", err); |
|
|
|
return err; |
|
} |
|
|
|
static int rtrs_rdma_conn_established(struct rtrs_clt_con *con, |
|
struct rdma_cm_event *ev) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
struct rtrs_clt *clt = sess->clt; |
|
const struct rtrs_msg_conn_rsp *msg; |
|
u16 version, queue_depth; |
|
int errno; |
|
u8 len; |
|
|
|
msg = ev->param.conn.private_data; |
|
len = ev->param.conn.private_data_len; |
|
if (len < sizeof(*msg)) { |
|
rtrs_err(clt, "Invalid RTRS connection response\n"); |
|
return -ECONNRESET; |
|
} |
|
if (le16_to_cpu(msg->magic) != RTRS_MAGIC) { |
|
rtrs_err(clt, "Invalid RTRS magic\n"); |
|
return -ECONNRESET; |
|
} |
|
version = le16_to_cpu(msg->version); |
|
if (version >> 8 != RTRS_PROTO_VER_MAJOR) { |
|
rtrs_err(clt, "Unsupported major RTRS version: %d, expected %d\n", |
|
version >> 8, RTRS_PROTO_VER_MAJOR); |
|
return -ECONNRESET; |
|
} |
|
errno = le16_to_cpu(msg->errno); |
|
if (errno) { |
|
rtrs_err(clt, "Invalid RTRS message: errno %d\n", |
|
errno); |
|
return -ECONNRESET; |
|
} |
|
if (con->c.cid == 0) { |
|
queue_depth = le16_to_cpu(msg->queue_depth); |
|
|
|
if (queue_depth > MAX_SESS_QUEUE_DEPTH) { |
|
rtrs_err(clt, "Invalid RTRS message: queue=%d\n", |
|
queue_depth); |
|
return -ECONNRESET; |
|
} |
|
if (!sess->rbufs || sess->queue_depth < queue_depth) { |
|
kfree(sess->rbufs); |
|
sess->rbufs = kcalloc(queue_depth, sizeof(*sess->rbufs), |
|
GFP_KERNEL); |
|
if (!sess->rbufs) |
|
return -ENOMEM; |
|
} |
|
sess->queue_depth = queue_depth; |
|
sess->max_hdr_size = le32_to_cpu(msg->max_hdr_size); |
|
sess->max_io_size = le32_to_cpu(msg->max_io_size); |
|
sess->flags = le32_to_cpu(msg->flags); |
|
sess->chunk_size = sess->max_io_size + sess->max_hdr_size; |
|
|
|
/* |
|
* Global queue depth and IO size is always a minimum. |
|
* If while a reconnection server sends us a value a bit |
|
* higher - client does not care and uses cached minimum. |
|
* |
|
* Since we can have several sessions (paths) restablishing |
|
* connections in parallel, use lock. |
|
*/ |
|
mutex_lock(&clt->paths_mutex); |
|
clt->queue_depth = min_not_zero(sess->queue_depth, |
|
clt->queue_depth); |
|
clt->max_io_size = min_not_zero(sess->max_io_size, |
|
clt->max_io_size); |
|
mutex_unlock(&clt->paths_mutex); |
|
|
|
/* |
|
* Cache the hca_port and hca_name for sysfs |
|
*/ |
|
sess->hca_port = con->c.cm_id->port_num; |
|
scnprintf(sess->hca_name, sizeof(sess->hca_name), |
|
sess->s.dev->ib_dev->name); |
|
sess->s.src_addr = con->c.cm_id->route.addr.src_addr; |
|
/* set for_new_clt, to allow future reconnect on any path */ |
|
sess->for_new_clt = 1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static inline void flag_success_on_conn(struct rtrs_clt_con *con) |
|
{ |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
|
|
atomic_inc(&sess->connected_cnt); |
|
con->cm_err = 1; |
|
} |
|
|
|
static int rtrs_rdma_conn_rejected(struct rtrs_clt_con *con, |
|
struct rdma_cm_event *ev) |
|
{ |
|
struct rtrs_sess *s = con->c.sess; |
|
const struct rtrs_msg_conn_rsp *msg; |
|
const char *rej_msg; |
|
int status, errno; |
|
u8 data_len; |
|
|
|
status = ev->status; |
|
rej_msg = rdma_reject_msg(con->c.cm_id, status); |
|
msg = rdma_consumer_reject_data(con->c.cm_id, ev, &data_len); |
|
|
|
if (msg && data_len >= sizeof(*msg)) { |
|
errno = (int16_t)le16_to_cpu(msg->errno); |
|
if (errno == -EBUSY) |
|
rtrs_err(s, |
|
"Previous session is still exists on the server, please reconnect later\n"); |
|
else |
|
rtrs_err(s, |
|
"Connect rejected: status %d (%s), rtrs errno %d\n", |
|
status, rej_msg, errno); |
|
} else { |
|
rtrs_err(s, |
|
"Connect rejected but with malformed message: status %d (%s)\n", |
|
status, rej_msg); |
|
} |
|
|
|
return -ECONNRESET; |
|
} |
|
|
|
static void rtrs_clt_close_conns(struct rtrs_clt_sess *sess, bool wait) |
|
{ |
|
if (rtrs_clt_change_state_get_old(sess, RTRS_CLT_CLOSING, NULL)) |
|
queue_work(rtrs_wq, &sess->close_work); |
|
if (wait) |
|
flush_work(&sess->close_work); |
|
} |
|
|
|
static inline void flag_error_on_conn(struct rtrs_clt_con *con, int cm_err) |
|
{ |
|
if (con->cm_err == 1) { |
|
struct rtrs_clt_sess *sess; |
|
|
|
sess = to_clt_sess(con->c.sess); |
|
if (atomic_dec_and_test(&sess->connected_cnt)) |
|
|
|
wake_up(&sess->state_wq); |
|
} |
|
con->cm_err = cm_err; |
|
} |
|
|
|
static int rtrs_clt_rdma_cm_handler(struct rdma_cm_id *cm_id, |
|
struct rdma_cm_event *ev) |
|
{ |
|
struct rtrs_clt_con *con = cm_id->context; |
|
struct rtrs_sess *s = con->c.sess; |
|
struct rtrs_clt_sess *sess = to_clt_sess(s); |
|
int cm_err = 0; |
|
|
|
switch (ev->event) { |
|
case RDMA_CM_EVENT_ADDR_RESOLVED: |
|
cm_err = rtrs_rdma_addr_resolved(con); |
|
break; |
|
case RDMA_CM_EVENT_ROUTE_RESOLVED: |
|
cm_err = rtrs_rdma_route_resolved(con); |
|
break; |
|
case RDMA_CM_EVENT_ESTABLISHED: |
|
cm_err = rtrs_rdma_conn_established(con, ev); |
|
if (likely(!cm_err)) { |
|
/* |
|
* Report success and wake up. Here we abuse state_wq, |
|
* i.e. wake up without state change, but we set cm_err. |
|
*/ |
|
flag_success_on_conn(con); |
|
wake_up(&sess->state_wq); |
|
return 0; |
|
} |
|
break; |
|
case RDMA_CM_EVENT_REJECTED: |
|
cm_err = rtrs_rdma_conn_rejected(con, ev); |
|
break; |
|
case RDMA_CM_EVENT_DISCONNECTED: |
|
/* No message for disconnecting */ |
|
cm_err = -ECONNRESET; |
|
break; |
|
case RDMA_CM_EVENT_CONNECT_ERROR: |
|
case RDMA_CM_EVENT_UNREACHABLE: |
|
case RDMA_CM_EVENT_ADDR_CHANGE: |
|
case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
|
rtrs_wrn(s, "CM error event %d\n", ev->event); |
|
cm_err = -ECONNRESET; |
|
break; |
|
case RDMA_CM_EVENT_ADDR_ERROR: |
|
case RDMA_CM_EVENT_ROUTE_ERROR: |
|
rtrs_wrn(s, "CM error event %d\n", ev->event); |
|
cm_err = -EHOSTUNREACH; |
|
break; |
|
case RDMA_CM_EVENT_DEVICE_REMOVAL: |
|
/* |
|
* Device removal is a special case. Queue close and return 0. |
|
*/ |
|
rtrs_clt_close_conns(sess, false); |
|
return 0; |
|
default: |
|
rtrs_err(s, "Unexpected RDMA CM event (%d)\n", ev->event); |
|
cm_err = -ECONNRESET; |
|
break; |
|
} |
|
|
|
if (cm_err) { |
|
/* |
|
* cm error makes sense only on connection establishing, |
|
* in other cases we rely on normal procedure of reconnecting. |
|
*/ |
|
flag_error_on_conn(con, cm_err); |
|
rtrs_rdma_error_recovery(con); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int create_cm(struct rtrs_clt_con *con) |
|
{ |
|
struct rtrs_sess *s = con->c.sess; |
|
struct rtrs_clt_sess *sess = to_clt_sess(s); |
|
struct rdma_cm_id *cm_id; |
|
int err; |
|
|
|
cm_id = rdma_create_id(&init_net, rtrs_clt_rdma_cm_handler, con, |
|
sess->s.dst_addr.ss_family == AF_IB ? |
|
RDMA_PS_IB : RDMA_PS_TCP, IB_QPT_RC); |
|
if (IS_ERR(cm_id)) { |
|
err = PTR_ERR(cm_id); |
|
rtrs_err(s, "Failed to create CM ID, err: %d\n", err); |
|
|
|
return err; |
|
} |
|
con->c.cm_id = cm_id; |
|
con->cm_err = 0; |
|
/* allow the port to be reused */ |
|
err = rdma_set_reuseaddr(cm_id, 1); |
|
if (err != 0) { |
|
rtrs_err(s, "Set address reuse failed, err: %d\n", err); |
|
goto destroy_cm; |
|
} |
|
err = rdma_resolve_addr(cm_id, (struct sockaddr *)&sess->s.src_addr, |
|
(struct sockaddr *)&sess->s.dst_addr, |
|
RTRS_CONNECT_TIMEOUT_MS); |
|
if (err) { |
|
rtrs_err(s, "Failed to resolve address, err: %d\n", err); |
|
goto destroy_cm; |
|
} |
|
/* |
|
* Combine connection status and session events. This is needed |
|
* for waiting two possible cases: cm_err has something meaningful |
|
* or session state was really changed to error by device removal. |
|
*/ |
|
err = wait_event_interruptible_timeout( |
|
sess->state_wq, |
|
con->cm_err || sess->state != RTRS_CLT_CONNECTING, |
|
msecs_to_jiffies(RTRS_CONNECT_TIMEOUT_MS)); |
|
if (err == 0 || err == -ERESTARTSYS) { |
|
if (err == 0) |
|
err = -ETIMEDOUT; |
|
/* Timedout or interrupted */ |
|
goto errr; |
|
} |
|
if (con->cm_err < 0) { |
|
err = con->cm_err; |
|
goto errr; |
|
} |
|
if (READ_ONCE(sess->state) != RTRS_CLT_CONNECTING) { |
|
/* Device removal */ |
|
err = -ECONNABORTED; |
|
goto errr; |
|
} |
|
|
|
return 0; |
|
|
|
errr: |
|
stop_cm(con); |
|
mutex_lock(&con->con_mutex); |
|
destroy_con_cq_qp(con); |
|
mutex_unlock(&con->con_mutex); |
|
destroy_cm: |
|
destroy_cm(con); |
|
|
|
return err; |
|
} |
|
|
|
static void rtrs_clt_sess_up(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt *clt = sess->clt; |
|
int up; |
|
|
|
/* |
|
* We can fire RECONNECTED event only when all paths were |
|
* connected on rtrs_clt_open(), then each was disconnected |
|
* and the first one connected again. That's why this nasty |
|
* game with counter value. |
|
*/ |
|
|
|
mutex_lock(&clt->paths_ev_mutex); |
|
up = ++clt->paths_up; |
|
/* |
|
* Here it is safe to access paths num directly since up counter |
|
* is greater than MAX_PATHS_NUM only while rtrs_clt_open() is |
|
* in progress, thus paths removals are impossible. |
|
*/ |
|
if (up > MAX_PATHS_NUM && up == MAX_PATHS_NUM + clt->paths_num) |
|
clt->paths_up = clt->paths_num; |
|
else if (up == 1) |
|
clt->link_ev(clt->priv, RTRS_CLT_LINK_EV_RECONNECTED); |
|
mutex_unlock(&clt->paths_ev_mutex); |
|
|
|
/* Mark session as established */ |
|
sess->established = true; |
|
sess->reconnect_attempts = 0; |
|
sess->stats->reconnects.successful_cnt++; |
|
} |
|
|
|
static void rtrs_clt_sess_down(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt *clt = sess->clt; |
|
|
|
if (!sess->established) |
|
return; |
|
|
|
sess->established = false; |
|
mutex_lock(&clt->paths_ev_mutex); |
|
WARN_ON(!clt->paths_up); |
|
if (--clt->paths_up == 0) |
|
clt->link_ev(clt->priv, RTRS_CLT_LINK_EV_DISCONNECTED); |
|
mutex_unlock(&clt->paths_ev_mutex); |
|
} |
|
|
|
static void rtrs_clt_stop_and_destroy_conns(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt_con *con; |
|
unsigned int cid; |
|
|
|
WARN_ON(READ_ONCE(sess->state) == RTRS_CLT_CONNECTED); |
|
|
|
/* |
|
* Possible race with rtrs_clt_open(), when DEVICE_REMOVAL comes |
|
* exactly in between. Start destroying after it finishes. |
|
*/ |
|
mutex_lock(&sess->init_mutex); |
|
mutex_unlock(&sess->init_mutex); |
|
|
|
/* |
|
* All IO paths must observe !CONNECTED state before we |
|
* free everything. |
|
*/ |
|
synchronize_rcu(); |
|
|
|
rtrs_clt_stop_hb(sess); |
|
|
|
/* |
|
* The order it utterly crucial: firstly disconnect and complete all |
|
* rdma requests with error (thus set in_use=false for requests), |
|
* then fail outstanding requests checking in_use for each, and |
|
* eventually notify upper layer about session disconnection. |
|
*/ |
|
|
|
for (cid = 0; cid < sess->s.con_num; cid++) { |
|
if (!sess->s.con[cid]) |
|
break; |
|
con = to_clt_con(sess->s.con[cid]); |
|
stop_cm(con); |
|
} |
|
fail_all_outstanding_reqs(sess); |
|
free_sess_reqs(sess); |
|
rtrs_clt_sess_down(sess); |
|
|
|
/* |
|
* Wait for graceful shutdown, namely when peer side invokes |
|
* rdma_disconnect(). 'connected_cnt' is decremented only on |
|
* CM events, thus if other side had crashed and hb has detected |
|
* something is wrong, here we will stuck for exactly timeout ms, |
|
* since CM does not fire anything. That is fine, we are not in |
|
* hurry. |
|
*/ |
|
wait_event_timeout(sess->state_wq, !atomic_read(&sess->connected_cnt), |
|
msecs_to_jiffies(RTRS_CONNECT_TIMEOUT_MS)); |
|
|
|
for (cid = 0; cid < sess->s.con_num; cid++) { |
|
if (!sess->s.con[cid]) |
|
break; |
|
con = to_clt_con(sess->s.con[cid]); |
|
mutex_lock(&con->con_mutex); |
|
destroy_con_cq_qp(con); |
|
mutex_unlock(&con->con_mutex); |
|
destroy_cm(con); |
|
destroy_con(con); |
|
} |
|
} |
|
|
|
static inline bool xchg_sessions(struct rtrs_clt_sess __rcu **rcu_ppcpu_path, |
|
struct rtrs_clt_sess *sess, |
|
struct rtrs_clt_sess *next) |
|
{ |
|
struct rtrs_clt_sess **ppcpu_path; |
|
|
|
/* Call cmpxchg() without sparse warnings */ |
|
ppcpu_path = (typeof(ppcpu_path))rcu_ppcpu_path; |
|
return sess == cmpxchg(ppcpu_path, sess, next); |
|
} |
|
|
|
static void rtrs_clt_remove_path_from_arr(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt *clt = sess->clt; |
|
struct rtrs_clt_sess *next; |
|
bool wait_for_grace = false; |
|
int cpu; |
|
|
|
mutex_lock(&clt->paths_mutex); |
|
list_del_rcu(&sess->s.entry); |
|
|
|
/* Make sure everybody observes path removal. */ |
|
synchronize_rcu(); |
|
|
|
/* |
|
* At this point nobody sees @sess in the list, but still we have |
|
* dangling pointer @pcpu_path which _can_ point to @sess. Since |
|
* nobody can observe @sess in the list, we guarantee that IO path |
|
* will not assign @sess to @pcpu_path, i.e. @pcpu_path can be equal |
|
* to @sess, but can never again become @sess. |
|
*/ |
|
|
|
/* |
|
* Decrement paths number only after grace period, because |
|
* caller of do_each_path() must firstly observe list without |
|
* path and only then decremented paths number. |
|
* |
|
* Otherwise there can be the following situation: |
|
* o Two paths exist and IO is coming. |
|
* o One path is removed: |
|
* CPU#0 CPU#1 |
|
* do_each_path(): rtrs_clt_remove_path_from_arr(): |
|
* path = get_next_path() |
|
* ^^^ list_del_rcu(path) |
|
* [!CONNECTED path] clt->paths_num-- |
|
* ^^^^^^^^^ |
|
* load clt->paths_num from 2 to 1 |
|
* ^^^^^^^^^ |
|
* sees 1 |
|
* |
|
* path is observed as !CONNECTED, but do_each_path() loop |
|
* ends, because expression i < clt->paths_num is false. |
|
*/ |
|
clt->paths_num--; |
|
|
|
/* |
|
* Get @next connection from current @sess which is going to be |
|
* removed. If @sess is the last element, then @next is NULL. |
|
*/ |
|
rcu_read_lock(); |
|
next = list_next_or_null_rr_rcu(&clt->paths_list, &sess->s.entry, |
|
typeof(*next), s.entry); |
|
rcu_read_unlock(); |
|
|
|
/* |
|
* @pcpu paths can still point to the path which is going to be |
|
* removed, so change the pointer manually. |
|
*/ |
|
for_each_possible_cpu(cpu) { |
|
struct rtrs_clt_sess __rcu **ppcpu_path; |
|
|
|
ppcpu_path = per_cpu_ptr(clt->pcpu_path, cpu); |
|
if (rcu_dereference_protected(*ppcpu_path, |
|
lockdep_is_held(&clt->paths_mutex)) != sess) |
|
/* |
|
* synchronize_rcu() was called just after deleting |
|
* entry from the list, thus IO code path cannot |
|
* change pointer back to the pointer which is going |
|
* to be removed, we are safe here. |
|
*/ |
|
continue; |
|
|
|
/* |
|
* We race with IO code path, which also changes pointer, |
|
* thus we have to be careful not to overwrite it. |
|
*/ |
|
if (xchg_sessions(ppcpu_path, sess, next)) |
|
/* |
|
* @ppcpu_path was successfully replaced with @next, |
|
* that means that someone could also pick up the |
|
* @sess and dereferencing it right now, so wait for |
|
* a grace period is required. |
|
*/ |
|
wait_for_grace = true; |
|
} |
|
if (wait_for_grace) |
|
synchronize_rcu(); |
|
|
|
mutex_unlock(&clt->paths_mutex); |
|
} |
|
|
|
static void rtrs_clt_add_path_to_arr(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt *clt = sess->clt; |
|
|
|
mutex_lock(&clt->paths_mutex); |
|
clt->paths_num++; |
|
|
|
list_add_tail_rcu(&sess->s.entry, &clt->paths_list); |
|
mutex_unlock(&clt->paths_mutex); |
|
} |
|
|
|
static void rtrs_clt_close_work(struct work_struct *work) |
|
{ |
|
struct rtrs_clt_sess *sess; |
|
|
|
sess = container_of(work, struct rtrs_clt_sess, close_work); |
|
|
|
cancel_delayed_work_sync(&sess->reconnect_dwork); |
|
rtrs_clt_stop_and_destroy_conns(sess); |
|
rtrs_clt_change_state_get_old(sess, RTRS_CLT_CLOSED, NULL); |
|
} |
|
|
|
static int init_conns(struct rtrs_clt_sess *sess) |
|
{ |
|
unsigned int cid; |
|
int err; |
|
|
|
/* |
|
* On every new session connections increase reconnect counter |
|
* to avoid clashes with previous sessions not yet closed |
|
* sessions on a server side. |
|
*/ |
|
sess->s.recon_cnt++; |
|
|
|
/* Establish all RDMA connections */ |
|
for (cid = 0; cid < sess->s.con_num; cid++) { |
|
err = create_con(sess, cid); |
|
if (err) |
|
goto destroy; |
|
|
|
err = create_cm(to_clt_con(sess->s.con[cid])); |
|
if (err) { |
|
destroy_con(to_clt_con(sess->s.con[cid])); |
|
goto destroy; |
|
} |
|
} |
|
err = alloc_sess_reqs(sess); |
|
if (err) |
|
goto destroy; |
|
|
|
rtrs_clt_start_hb(sess); |
|
|
|
return 0; |
|
|
|
destroy: |
|
while (cid--) { |
|
struct rtrs_clt_con *con = to_clt_con(sess->s.con[cid]); |
|
|
|
stop_cm(con); |
|
|
|
mutex_lock(&con->con_mutex); |
|
destroy_con_cq_qp(con); |
|
mutex_unlock(&con->con_mutex); |
|
destroy_cm(con); |
|
destroy_con(con); |
|
} |
|
/* |
|
* If we've never taken async path and got an error, say, |
|
* doing rdma_resolve_addr(), switch to CONNECTION_ERR state |
|
* manually to keep reconnecting. |
|
*/ |
|
rtrs_clt_change_state_get_old(sess, RTRS_CLT_CONNECTING_ERR, NULL); |
|
|
|
return err; |
|
} |
|
|
|
static void rtrs_clt_info_req_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct rtrs_clt_con *con = cq->cq_context; |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
struct rtrs_iu *iu; |
|
|
|
iu = container_of(wc->wr_cqe, struct rtrs_iu, cqe); |
|
rtrs_iu_free(iu, sess->s.dev->ib_dev, 1); |
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) { |
|
rtrs_err(sess->clt, "Sess info request send failed: %s\n", |
|
ib_wc_status_msg(wc->status)); |
|
rtrs_clt_change_state_get_old(sess, RTRS_CLT_CONNECTING_ERR, NULL); |
|
return; |
|
} |
|
|
|
rtrs_clt_update_wc_stats(con); |
|
} |
|
|
|
static int process_info_rsp(struct rtrs_clt_sess *sess, |
|
const struct rtrs_msg_info_rsp *msg) |
|
{ |
|
unsigned int sg_cnt, total_len; |
|
int i, sgi; |
|
|
|
sg_cnt = le16_to_cpu(msg->sg_cnt); |
|
if (unlikely(!sg_cnt || (sess->queue_depth % sg_cnt))) { |
|
rtrs_err(sess->clt, "Incorrect sg_cnt %d, is not multiple\n", |
|
sg_cnt); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* Check if IB immediate data size is enough to hold the mem_id and |
|
* the offset inside the memory chunk. |
|
*/ |
|
if (unlikely((ilog2(sg_cnt - 1) + 1) + |
|
(ilog2(sess->chunk_size - 1) + 1) > |
|
MAX_IMM_PAYL_BITS)) { |
|
rtrs_err(sess->clt, |
|
"RDMA immediate size (%db) not enough to encode %d buffers of size %dB\n", |
|
MAX_IMM_PAYL_BITS, sg_cnt, sess->chunk_size); |
|
return -EINVAL; |
|
} |
|
total_len = 0; |
|
for (sgi = 0, i = 0; sgi < sg_cnt && i < sess->queue_depth; sgi++) { |
|
const struct rtrs_sg_desc *desc = &msg->desc[sgi]; |
|
u32 len, rkey; |
|
u64 addr; |
|
|
|
addr = le64_to_cpu(desc->addr); |
|
rkey = le32_to_cpu(desc->key); |
|
len = le32_to_cpu(desc->len); |
|
|
|
total_len += len; |
|
|
|
if (unlikely(!len || (len % sess->chunk_size))) { |
|
rtrs_err(sess->clt, "Incorrect [%d].len %d\n", sgi, |
|
len); |
|
return -EINVAL; |
|
} |
|
for ( ; len && i < sess->queue_depth; i++) { |
|
sess->rbufs[i].addr = addr; |
|
sess->rbufs[i].rkey = rkey; |
|
|
|
len -= sess->chunk_size; |
|
addr += sess->chunk_size; |
|
} |
|
} |
|
/* Sanity check */ |
|
if (unlikely(sgi != sg_cnt || i != sess->queue_depth)) { |
|
rtrs_err(sess->clt, "Incorrect sg vector, not fully mapped\n"); |
|
return -EINVAL; |
|
} |
|
if (unlikely(total_len != sess->chunk_size * sess->queue_depth)) { |
|
rtrs_err(sess->clt, "Incorrect total_len %d\n", total_len); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void rtrs_clt_info_rsp_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct rtrs_clt_con *con = cq->cq_context; |
|
struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess); |
|
struct rtrs_msg_info_rsp *msg; |
|
enum rtrs_clt_state state; |
|
struct rtrs_iu *iu; |
|
size_t rx_sz; |
|
int err; |
|
|
|
state = RTRS_CLT_CONNECTING_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(sess->clt, "Sess info response recv failed: %s\n", |
|
ib_wc_status_msg(wc->status)); |
|
goto out; |
|
} |
|
WARN_ON(wc->opcode != IB_WC_RECV); |
|
|
|
if (unlikely(wc->byte_len < sizeof(*msg))) { |
|
rtrs_err(sess->clt, "Sess info response is malformed: size %d\n", |
|
wc->byte_len); |
|
goto out; |
|
} |
|
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_RSP)) { |
|
rtrs_err(sess->clt, "Sess info response is malformed: type %d\n", |
|
le16_to_cpu(msg->type)); |
|
goto out; |
|
} |
|
rx_sz = sizeof(*msg); |
|
rx_sz += sizeof(msg->desc[0]) * le16_to_cpu(msg->sg_cnt); |
|
if (unlikely(wc->byte_len < rx_sz)) { |
|
rtrs_err(sess->clt, "Sess info response is malformed: size %d\n", |
|
wc->byte_len); |
|
goto out; |
|
} |
|
err = process_info_rsp(sess, msg); |
|
if (unlikely(err)) |
|
goto out; |
|
|
|
err = post_recv_sess(sess); |
|
if (unlikely(err)) |
|
goto out; |
|
|
|
state = RTRS_CLT_CONNECTED; |
|
|
|
out: |
|
rtrs_clt_update_wc_stats(con); |
|
rtrs_iu_free(iu, sess->s.dev->ib_dev, 1); |
|
rtrs_clt_change_state_get_old(sess, state, NULL); |
|
} |
|
|
|
static int rtrs_send_sess_info(struct rtrs_clt_sess *sess) |
|
{ |
|
struct rtrs_clt_con *usr_con = to_clt_con(sess->s.con[0]); |
|
struct rtrs_msg_info_req *msg; |
|
struct rtrs_iu *tx_iu, *rx_iu; |
|
size_t rx_sz; |
|
int err; |
|
|
|
rx_sz = sizeof(struct rtrs_msg_info_rsp); |
|
rx_sz += sizeof(u64) * MAX_SESS_QUEUE_DEPTH; |
|
|
|
tx_iu = rtrs_iu_alloc(1, sizeof(struct rtrs_msg_info_req), GFP_KERNEL, |
|
sess->s.dev->ib_dev, DMA_TO_DEVICE, |
|
rtrs_clt_info_req_done); |
|
rx_iu = rtrs_iu_alloc(1, rx_sz, GFP_KERNEL, sess->s.dev->ib_dev, |
|
DMA_FROM_DEVICE, rtrs_clt_info_rsp_done); |
|
if (unlikely(!tx_iu || !rx_iu)) { |
|
err = -ENOMEM; |
|
goto out; |
|
} |
|
/* Prepare for getting info response */ |
|
err = rtrs_iu_post_recv(&usr_con->c, rx_iu); |
|
if (unlikely(err)) { |
|
rtrs_err(sess->clt, "rtrs_iu_post_recv(), err: %d\n", err); |
|
goto out; |
|
} |
|
rx_iu = NULL; |
|
|
|
msg = tx_iu->buf; |
|
msg->type = cpu_to_le16(RTRS_MSG_INFO_REQ); |
|
memcpy(msg->sessname, sess->s.sessname, sizeof(msg->sessname)); |
|
|
|
ib_dma_sync_single_for_device(sess->s.dev->ib_dev, tx_iu->dma_addr, |
|
tx_iu->size, DMA_TO_DEVICE); |
|
|
|
/* Send info request */ |
|
err = rtrs_iu_post_send(&usr_con->c, tx_iu, sizeof(*msg), NULL); |
|
if (unlikely(err)) { |
|
rtrs_err(sess->clt, "rtrs_iu_post_send(), err: %d\n", err); |
|
goto out; |
|
} |
|
tx_iu = NULL; |
|
|
|
/* Wait for state change */ |
|
wait_event_interruptible_timeout(sess->state_wq, |
|
sess->state != RTRS_CLT_CONNECTING, |
|
msecs_to_jiffies( |
|
RTRS_CONNECT_TIMEOUT_MS)); |
|
if (unlikely(READ_ONCE(sess->state) != RTRS_CLT_CONNECTED)) { |
|
if (READ_ONCE(sess->state) == RTRS_CLT_CONNECTING_ERR) |
|
err = -ECONNRESET; |
|
else |
|
err = -ETIMEDOUT; |
|
} |
|
|
|
out: |
|
if (tx_iu) |
|
rtrs_iu_free(tx_iu, sess->s.dev->ib_dev, 1); |
|
if (rx_iu) |
|
rtrs_iu_free(rx_iu, sess->s.dev->ib_dev, 1); |
|
if (unlikely(err)) |
|
/* If we've never taken async path because of malloc problems */ |
|
rtrs_clt_change_state_get_old(sess, RTRS_CLT_CONNECTING_ERR, NULL); |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* init_sess() - establishes all session connections and does handshake |
|
* @sess: client session. |
|
* In case of error full close or reconnect procedure should be taken, |
|
* because reconnect or close async works can be started. |
|
*/ |
|
static int init_sess(struct rtrs_clt_sess *sess) |
|
{ |
|
int err; |
|
|
|
mutex_lock(&sess->init_mutex); |
|
err = init_conns(sess); |
|
if (err) { |
|
rtrs_err(sess->clt, "init_conns(), err: %d\n", err); |
|
goto out; |
|
} |
|
err = rtrs_send_sess_info(sess); |
|
if (err) { |
|
rtrs_err(sess->clt, "rtrs_send_sess_info(), err: %d\n", err); |
|
goto out; |
|
} |
|
rtrs_clt_sess_up(sess); |
|
out: |
|
mutex_unlock(&sess->init_mutex); |
|
|
|
return err; |
|
} |
|
|
|
static void rtrs_clt_reconnect_work(struct work_struct *work) |
|
{ |
|
struct rtrs_clt_sess *sess; |
|
struct rtrs_clt *clt; |
|
unsigned int delay_ms; |
|
int err; |
|
|
|
sess = container_of(to_delayed_work(work), struct rtrs_clt_sess, |
|
reconnect_dwork); |
|
clt = sess->clt; |
|
|
|
if (READ_ONCE(sess->state) != RTRS_CLT_RECONNECTING) |
|
return; |
|
|
|
if (sess->reconnect_attempts >= clt->max_reconnect_attempts) { |
|
/* Close a session completely if max attempts is reached */ |
|
rtrs_clt_close_conns(sess, false); |
|
return; |
|
} |
|
sess->reconnect_attempts++; |
|
|
|
/* Stop everything */ |
|
rtrs_clt_stop_and_destroy_conns(sess); |
|
msleep(RTRS_RECONNECT_BACKOFF); |
|
if (rtrs_clt_change_state_get_old(sess, RTRS_CLT_CONNECTING, NULL)) { |
|
err = init_sess(sess); |
|
if (err) |
|
goto reconnect_again; |
|
} |
|
|
|
return; |
|
|
|
reconnect_again: |
|
if (rtrs_clt_change_state_get_old(sess, RTRS_CLT_RECONNECTING, NULL)) { |
|
sess->stats->reconnects.fail_cnt++; |
|
delay_ms = clt->reconnect_delay_sec * 1000; |
|
queue_delayed_work(rtrs_wq, &sess->reconnect_dwork, |
|
msecs_to_jiffies(delay_ms + |
|
prandom_u32() % |
|
RTRS_RECONNECT_SEED)); |
|
} |
|
} |
|
|
|
static void rtrs_clt_dev_release(struct device *dev) |
|
{ |
|
struct rtrs_clt *clt = container_of(dev, struct rtrs_clt, dev); |
|
|
|
kfree(clt); |
|
} |
|
|
|
static struct rtrs_clt *alloc_clt(const char *sessname, size_t paths_num, |
|
u16 port, size_t pdu_sz, void *priv, |
|
void (*link_ev)(void *priv, |
|
enum rtrs_clt_link_ev ev), |
|
unsigned int max_segments, |
|
size_t max_segment_size, |
|
unsigned int reconnect_delay_sec, |
|
unsigned int max_reconnect_attempts) |
|
{ |
|
struct rtrs_clt *clt; |
|
int err; |
|
|
|
if (!paths_num || paths_num > MAX_PATHS_NUM) |
|
return ERR_PTR(-EINVAL); |
|
|
|
if (strlen(sessname) >= sizeof(clt->sessname)) |
|
return ERR_PTR(-EINVAL); |
|
|
|
clt = kzalloc(sizeof(*clt), GFP_KERNEL); |
|
if (!clt) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
clt->pcpu_path = alloc_percpu(typeof(*clt->pcpu_path)); |
|
if (!clt->pcpu_path) { |
|
kfree(clt); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
|
|
uuid_gen(&clt->paths_uuid); |
|
INIT_LIST_HEAD_RCU(&clt->paths_list); |
|
clt->paths_num = paths_num; |
|
clt->paths_up = MAX_PATHS_NUM; |
|
clt->port = port; |
|
clt->pdu_sz = pdu_sz; |
|
clt->max_segments = max_segments; |
|
clt->max_segment_size = max_segment_size; |
|
clt->reconnect_delay_sec = reconnect_delay_sec; |
|
clt->max_reconnect_attempts = max_reconnect_attempts; |
|
clt->priv = priv; |
|
clt->link_ev = link_ev; |
|
clt->mp_policy = MP_POLICY_MIN_INFLIGHT; |
|
strlcpy(clt->sessname, sessname, sizeof(clt->sessname)); |
|
init_waitqueue_head(&clt->permits_wait); |
|
mutex_init(&clt->paths_ev_mutex); |
|
mutex_init(&clt->paths_mutex); |
|
|
|
clt->dev.class = rtrs_clt_dev_class; |
|
clt->dev.release = rtrs_clt_dev_release; |
|
err = dev_set_name(&clt->dev, "%s", sessname); |
|
if (err) |
|
goto err; |
|
/* |
|
* Suppress user space notification until |
|
* sysfs files are created |
|
*/ |
|
dev_set_uevent_suppress(&clt->dev, true); |
|
err = device_register(&clt->dev); |
|
if (err) { |
|
put_device(&clt->dev); |
|
goto err; |
|
} |
|
|
|
clt->kobj_paths = kobject_create_and_add("paths", &clt->dev.kobj); |
|
if (!clt->kobj_paths) { |
|
err = -ENOMEM; |
|
goto err_dev; |
|
} |
|
err = rtrs_clt_create_sysfs_root_files(clt); |
|
if (err) { |
|
kobject_del(clt->kobj_paths); |
|
kobject_put(clt->kobj_paths); |
|
goto err_dev; |
|
} |
|
dev_set_uevent_suppress(&clt->dev, false); |
|
kobject_uevent(&clt->dev.kobj, KOBJ_ADD); |
|
|
|
return clt; |
|
err_dev: |
|
device_unregister(&clt->dev); |
|
err: |
|
free_percpu(clt->pcpu_path); |
|
kfree(clt); |
|
return ERR_PTR(err); |
|
} |
|
|
|
static void free_clt(struct rtrs_clt *clt) |
|
{ |
|
free_permits(clt); |
|
free_percpu(clt->pcpu_path); |
|
mutex_destroy(&clt->paths_ev_mutex); |
|
mutex_destroy(&clt->paths_mutex); |
|
/* release callback will free clt in last put */ |
|
device_unregister(&clt->dev); |
|
} |
|
|
|
/** |
|
* rtrs_clt_open() - Open a session to an RTRS server |
|
* @ops: holds the link event callback and the private pointer. |
|
* @sessname: name of the session |
|
* @paths: Paths to be established defined by their src and dst addresses |
|
* @paths_num: Number of elements in the @paths array |
|
* @port: port to be used by the RTRS session |
|
* @pdu_sz: Size of extra payload which can be accessed after permit allocation. |
|
* @reconnect_delay_sec: time between reconnect tries |
|
* @max_segments: Max. number of segments per IO request |
|
* @max_segment_size: Max. size of one segment |
|
* @max_reconnect_attempts: Number of times to reconnect on error before giving |
|
* up, 0 for * disabled, -1 for forever |
|
* |
|
* Starts session establishment with the rtrs_server. The function can block |
|
* up to ~2000ms before it returns. |
|
* |
|
* Return a valid pointer on success otherwise PTR_ERR. |
|
*/ |
|
struct rtrs_clt *rtrs_clt_open(struct rtrs_clt_ops *ops, |
|
const char *sessname, |
|
const struct rtrs_addr *paths, |
|
size_t paths_num, u16 port, |
|
size_t pdu_sz, u8 reconnect_delay_sec, |
|
u16 max_segments, |
|
size_t max_segment_size, |
|
s16 max_reconnect_attempts) |
|
{ |
|
struct rtrs_clt_sess *sess, *tmp; |
|
struct rtrs_clt *clt; |
|
int err, i; |
|
|
|
clt = alloc_clt(sessname, paths_num, port, pdu_sz, ops->priv, |
|
ops->link_ev, |
|
max_segments, max_segment_size, reconnect_delay_sec, |
|
max_reconnect_attempts); |
|
if (IS_ERR(clt)) { |
|
err = PTR_ERR(clt); |
|
goto out; |
|
} |
|
for (i = 0; i < paths_num; i++) { |
|
struct rtrs_clt_sess *sess; |
|
|
|
sess = alloc_sess(clt, &paths[i], nr_cpu_ids, |
|
max_segments, max_segment_size); |
|
if (IS_ERR(sess)) { |
|
err = PTR_ERR(sess); |
|
goto close_all_sess; |
|
} |
|
if (!i) |
|
sess->for_new_clt = 1; |
|
list_add_tail_rcu(&sess->s.entry, &clt->paths_list); |
|
|
|
err = init_sess(sess); |
|
if (err) { |
|
list_del_rcu(&sess->s.entry); |
|
rtrs_clt_close_conns(sess, true); |
|
free_sess(sess); |
|
goto close_all_sess; |
|
} |
|
|
|
err = rtrs_clt_create_sess_files(sess); |
|
if (err) { |
|
list_del_rcu(&sess->s.entry); |
|
rtrs_clt_close_conns(sess, true); |
|
free_sess(sess); |
|
goto close_all_sess; |
|
} |
|
} |
|
err = alloc_permits(clt); |
|
if (err) |
|
goto close_all_sess; |
|
|
|
return clt; |
|
|
|
close_all_sess: |
|
list_for_each_entry_safe(sess, tmp, &clt->paths_list, s.entry) { |
|
rtrs_clt_destroy_sess_files(sess, NULL); |
|
rtrs_clt_close_conns(sess, true); |
|
kobject_put(&sess->kobj); |
|
} |
|
rtrs_clt_destroy_sysfs_root(clt); |
|
free_clt(clt); |
|
|
|
out: |
|
return ERR_PTR(err); |
|
} |
|
EXPORT_SYMBOL(rtrs_clt_open); |
|
|
|
/** |
|
* rtrs_clt_close() - Close a session |
|
* @clt: Session handle. Session is freed upon return. |
|
*/ |
|
void rtrs_clt_close(struct rtrs_clt *clt) |
|
{ |
|
struct rtrs_clt_sess *sess, *tmp; |
|
|
|
/* Firstly forbid sysfs access */ |
|
rtrs_clt_destroy_sysfs_root(clt); |
|
|
|
/* Now it is safe to iterate over all paths without locks */ |
|
list_for_each_entry_safe(sess, tmp, &clt->paths_list, s.entry) { |
|
rtrs_clt_close_conns(sess, true); |
|
rtrs_clt_destroy_sess_files(sess, NULL); |
|
kobject_put(&sess->kobj); |
|
} |
|
free_clt(clt); |
|
} |
|
EXPORT_SYMBOL(rtrs_clt_close); |
|
|
|
int rtrs_clt_reconnect_from_sysfs(struct rtrs_clt_sess *sess) |
|
{ |
|
enum rtrs_clt_state old_state; |
|
int err = -EBUSY; |
|
bool changed; |
|
|
|
changed = rtrs_clt_change_state_get_old(sess, RTRS_CLT_RECONNECTING, |
|
&old_state); |
|
if (changed) { |
|
sess->reconnect_attempts = 0; |
|
queue_delayed_work(rtrs_wq, &sess->reconnect_dwork, 0); |
|
} |
|
if (changed || old_state == RTRS_CLT_RECONNECTING) { |
|
/* |
|
* flush_delayed_work() queues pending work for immediate |
|
* execution, so do the flush if we have queued something |
|
* right now or work is pending. |
|
*/ |
|
flush_delayed_work(&sess->reconnect_dwork); |
|
err = (READ_ONCE(sess->state) == |
|
RTRS_CLT_CONNECTED ? 0 : -ENOTCONN); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
int rtrs_clt_disconnect_from_sysfs(struct rtrs_clt_sess *sess) |
|
{ |
|
rtrs_clt_close_conns(sess, true); |
|
|
|
return 0; |
|
} |
|
|
|
int rtrs_clt_remove_path_from_sysfs(struct rtrs_clt_sess *sess, |
|
const struct attribute *sysfs_self) |
|
{ |
|
enum rtrs_clt_state old_state; |
|
bool changed; |
|
|
|
/* |
|
* Continue stopping path till state was changed to DEAD or |
|
* state was observed as DEAD: |
|
* 1. State was changed to DEAD - we were fast and nobody |
|
* invoked rtrs_clt_reconnect(), which can again start |
|
* reconnecting. |
|
* 2. State was observed as DEAD - we have someone in parallel |
|
* removing the path. |
|
*/ |
|
do { |
|
rtrs_clt_close_conns(sess, true); |
|
changed = rtrs_clt_change_state_get_old(sess, |
|
RTRS_CLT_DEAD, |
|
&old_state); |
|
} while (!changed && old_state != RTRS_CLT_DEAD); |
|
|
|
if (likely(changed)) { |
|
rtrs_clt_remove_path_from_arr(sess); |
|
rtrs_clt_destroy_sess_files(sess, sysfs_self); |
|
kobject_put(&sess->kobj); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
void rtrs_clt_set_max_reconnect_attempts(struct rtrs_clt *clt, int value) |
|
{ |
|
clt->max_reconnect_attempts = (unsigned int)value; |
|
} |
|
|
|
int rtrs_clt_get_max_reconnect_attempts(const struct rtrs_clt *clt) |
|
{ |
|
return (int)clt->max_reconnect_attempts; |
|
} |
|
|
|
/** |
|
* rtrs_clt_request() - Request data transfer to/from server via RDMA. |
|
* |
|
* @dir: READ/WRITE |
|
* @ops: callback function to be called as confirmation, and the pointer. |
|
* @clt: Session |
|
* @permit: Preallocated permit |
|
* @vec: Message that is sent to server together with the request. |
|
* Sum of len of all @vec elements limited to <= IO_MSG_SIZE. |
|
* Since the msg is copied internally it can be allocated on stack. |
|
* @nr: Number of elements in @vec. |
|
* @data_len: length of data sent to/from server |
|
* @sg: Pages to be sent/received to/from server. |
|
* @sg_cnt: Number of elements in the @sg |
|
* |
|
* Return: |
|
* 0: Success |
|
* <0: Error |
|
* |
|
* On dir=READ rtrs client will request a data transfer from Server to client. |
|
* The data that the server will respond with will be stored in @sg when |
|
* the user receives an %RTRS_CLT_RDMA_EV_RDMA_REQUEST_WRITE_COMPL event. |
|
* On dir=WRITE rtrs client will rdma write data in sg to server side. |
|
*/ |
|
int rtrs_clt_request(int dir, struct rtrs_clt_req_ops *ops, |
|
struct rtrs_clt *clt, struct rtrs_permit *permit, |
|
const struct kvec *vec, size_t nr, size_t data_len, |
|
struct scatterlist *sg, unsigned int sg_cnt) |
|
{ |
|
struct rtrs_clt_io_req *req; |
|
struct rtrs_clt_sess *sess; |
|
|
|
enum dma_data_direction dma_dir; |
|
int err = -ECONNABORTED, i; |
|
size_t usr_len, hdr_len; |
|
struct path_it it; |
|
|
|
/* Get kvec length */ |
|
for (i = 0, usr_len = 0; i < nr; i++) |
|
usr_len += vec[i].iov_len; |
|
|
|
if (dir == READ) { |
|
hdr_len = sizeof(struct rtrs_msg_rdma_read) + |
|
sg_cnt * sizeof(struct rtrs_sg_desc); |
|
dma_dir = DMA_FROM_DEVICE; |
|
} else { |
|
hdr_len = sizeof(struct rtrs_msg_rdma_write); |
|
dma_dir = DMA_TO_DEVICE; |
|
} |
|
|
|
rcu_read_lock(); |
|
for (path_it_init(&it, clt); |
|
(sess = it.next_path(&it)) && it.i < it.clt->paths_num; it.i++) { |
|
if (unlikely(READ_ONCE(sess->state) != RTRS_CLT_CONNECTED)) |
|
continue; |
|
|
|
if (unlikely(usr_len + hdr_len > sess->max_hdr_size)) { |
|
rtrs_wrn_rl(sess->clt, |
|
"%s request failed, user message size is %zu and header length %zu, but max size is %u\n", |
|
dir == READ ? "Read" : "Write", |
|
usr_len, hdr_len, sess->max_hdr_size); |
|
err = -EMSGSIZE; |
|
break; |
|
} |
|
req = rtrs_clt_get_req(sess, ops->conf_fn, permit, ops->priv, |
|
vec, usr_len, sg, sg_cnt, data_len, |
|
dma_dir); |
|
if (dir == READ) |
|
err = rtrs_clt_read_req(req); |
|
else |
|
err = rtrs_clt_write_req(req); |
|
if (unlikely(err)) { |
|
req->in_use = false; |
|
continue; |
|
} |
|
/* Success path */ |
|
break; |
|
} |
|
path_it_deinit(&it); |
|
rcu_read_unlock(); |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL(rtrs_clt_request); |
|
|
|
/** |
|
* rtrs_clt_query() - queries RTRS session attributes |
|
*@clt: session pointer |
|
*@attr: query results for session attributes. |
|
* Returns: |
|
* 0 on success |
|
* -ECOMM no connection to the server |
|
*/ |
|
int rtrs_clt_query(struct rtrs_clt *clt, struct rtrs_attrs *attr) |
|
{ |
|
if (!rtrs_clt_is_connected(clt)) |
|
return -ECOMM; |
|
|
|
attr->queue_depth = clt->queue_depth; |
|
attr->max_io_size = clt->max_io_size; |
|
attr->sess_kobj = &clt->dev.kobj; |
|
strlcpy(attr->sessname, clt->sessname, sizeof(attr->sessname)); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(rtrs_clt_query); |
|
|
|
int rtrs_clt_create_path_from_sysfs(struct rtrs_clt *clt, |
|
struct rtrs_addr *addr) |
|
{ |
|
struct rtrs_clt_sess *sess; |
|
int err; |
|
|
|
sess = alloc_sess(clt, addr, nr_cpu_ids, clt->max_segments, |
|
clt->max_segment_size); |
|
if (IS_ERR(sess)) |
|
return PTR_ERR(sess); |
|
|
|
/* |
|
* It is totally safe to add path in CONNECTING state: coming |
|
* IO will never grab it. Also it is very important to add |
|
* path before init, since init fires LINK_CONNECTED event. |
|
*/ |
|
rtrs_clt_add_path_to_arr(sess); |
|
|
|
err = init_sess(sess); |
|
if (err) |
|
goto close_sess; |
|
|
|
err = rtrs_clt_create_sess_files(sess); |
|
if (err) |
|
goto close_sess; |
|
|
|
return 0; |
|
|
|
close_sess: |
|
rtrs_clt_remove_path_from_arr(sess); |
|
rtrs_clt_close_conns(sess, true); |
|
free_sess(sess); |
|
|
|
return err; |
|
} |
|
|
|
static int rtrs_clt_ib_dev_init(struct rtrs_ib_dev *dev) |
|
{ |
|
if (!(dev->ib_dev->attrs.device_cap_flags & |
|
IB_DEVICE_MEM_MGT_EXTENSIONS)) { |
|
pr_err("Memory registrations not supported.\n"); |
|
return -ENOTSUPP; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct rtrs_rdma_dev_pd_ops dev_pd_ops = { |
|
.init = rtrs_clt_ib_dev_init |
|
}; |
|
|
|
static int __init rtrs_client_init(void) |
|
{ |
|
rtrs_rdma_dev_pd_init(0, &dev_pd); |
|
|
|
rtrs_clt_dev_class = class_create(THIS_MODULE, "rtrs-client"); |
|
if (IS_ERR(rtrs_clt_dev_class)) { |
|
pr_err("Failed to create rtrs-client dev class\n"); |
|
return PTR_ERR(rtrs_clt_dev_class); |
|
} |
|
rtrs_wq = alloc_workqueue("rtrs_client_wq", 0, 0); |
|
if (!rtrs_wq) { |
|
class_destroy(rtrs_clt_dev_class); |
|
return -ENOMEM; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void __exit rtrs_client_exit(void) |
|
{ |
|
destroy_workqueue(rtrs_wq); |
|
class_destroy(rtrs_clt_dev_class); |
|
rtrs_rdma_dev_pd_deinit(&dev_pd); |
|
} |
|
|
|
module_init(rtrs_client_init); |
|
module_exit(rtrs_client_exit);
|
|
|