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ad1d7dc0d7
RDS FMR flush operation and also it races with connect/reconect which happes a lot with RDS. FMR flush being on common rds_wq aggrevates the problem. Lets push RDS FMR pool flush work to its own worker. Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
443 lines
12 KiB
C
443 lines
12 KiB
C
/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/in.h>
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#include <linux/if.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/if_arp.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include "rds.h"
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#include "ib.h"
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static unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
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unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
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unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
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module_param(fmr_pool_size, int, 0444);
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MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
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module_param(fmr_message_size, int, 0444);
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MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
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module_param(rds_ib_retry_count, int, 0444);
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MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
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/*
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* we have a clumsy combination of RCU and a rwsem protecting this list
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* because it is used both in the get_mr fast path and while blocking in
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* the FMR flushing path.
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*/
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DECLARE_RWSEM(rds_ib_devices_lock);
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struct list_head rds_ib_devices;
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/* NOTE: if also grabbing ibdev lock, grab this first */
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DEFINE_SPINLOCK(ib_nodev_conns_lock);
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LIST_HEAD(ib_nodev_conns);
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static void rds_ib_nodev_connect(void)
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{
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struct rds_ib_connection *ic;
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spin_lock(&ib_nodev_conns_lock);
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list_for_each_entry(ic, &ib_nodev_conns, ib_node)
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rds_conn_connect_if_down(ic->conn);
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spin_unlock(&ib_nodev_conns_lock);
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}
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static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
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{
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struct rds_ib_connection *ic;
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unsigned long flags;
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spin_lock_irqsave(&rds_ibdev->spinlock, flags);
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list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
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rds_conn_drop(ic->conn);
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spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
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}
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/*
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* rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
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* from interrupt context so we push freing off into a work struct in krdsd.
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*/
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static void rds_ib_dev_free(struct work_struct *work)
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{
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struct rds_ib_ipaddr *i_ipaddr, *i_next;
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struct rds_ib_device *rds_ibdev = container_of(work,
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struct rds_ib_device, free_work);
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if (rds_ibdev->mr_pool)
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rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
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if (rds_ibdev->mr)
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ib_dereg_mr(rds_ibdev->mr);
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if (rds_ibdev->pd)
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ib_dealloc_pd(rds_ibdev->pd);
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list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
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list_del(&i_ipaddr->list);
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kfree(i_ipaddr);
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}
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kfree(rds_ibdev);
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}
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void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
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{
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BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0);
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if (atomic_dec_and_test(&rds_ibdev->refcount))
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queue_work(rds_wq, &rds_ibdev->free_work);
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}
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static void rds_ib_add_one(struct ib_device *device)
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{
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struct rds_ib_device *rds_ibdev;
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struct ib_device_attr *dev_attr;
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/* Only handle IB (no iWARP) devices */
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if (device->node_type != RDMA_NODE_IB_CA)
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return;
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dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
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if (!dev_attr)
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return;
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if (ib_query_device(device, dev_attr)) {
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rdsdebug("Query device failed for %s\n", device->name);
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goto free_attr;
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}
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rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
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ibdev_to_node(device));
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if (!rds_ibdev)
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goto free_attr;
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spin_lock_init(&rds_ibdev->spinlock);
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atomic_set(&rds_ibdev->refcount, 1);
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INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
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rds_ibdev->max_wrs = dev_attr->max_qp_wr;
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rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
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rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
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rds_ibdev->max_fmrs = dev_attr->max_fmr ?
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min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
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fmr_pool_size;
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rds_ibdev->max_initiator_depth = dev_attr->max_qp_init_rd_atom;
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rds_ibdev->max_responder_resources = dev_attr->max_qp_rd_atom;
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rds_ibdev->dev = device;
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rds_ibdev->pd = ib_alloc_pd(device);
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if (IS_ERR(rds_ibdev->pd)) {
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rds_ibdev->pd = NULL;
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goto put_dev;
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}
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rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd, IB_ACCESS_LOCAL_WRITE);
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if (IS_ERR(rds_ibdev->mr)) {
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rds_ibdev->mr = NULL;
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goto put_dev;
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}
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rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
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if (IS_ERR(rds_ibdev->mr_pool)) {
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rds_ibdev->mr_pool = NULL;
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goto put_dev;
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}
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INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
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INIT_LIST_HEAD(&rds_ibdev->conn_list);
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down_write(&rds_ib_devices_lock);
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list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
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up_write(&rds_ib_devices_lock);
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atomic_inc(&rds_ibdev->refcount);
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ib_set_client_data(device, &rds_ib_client, rds_ibdev);
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atomic_inc(&rds_ibdev->refcount);
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rds_ib_nodev_connect();
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put_dev:
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rds_ib_dev_put(rds_ibdev);
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free_attr:
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kfree(dev_attr);
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}
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/*
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* New connections use this to find the device to associate with the
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* connection. It's not in the fast path so we're not concerned about the
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* performance of the IB call. (As of this writing, it uses an interrupt
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* blocking spinlock to serialize walking a per-device list of all registered
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* clients.)
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*
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* RCU is used to handle incoming connections racing with device teardown.
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* Rather than use a lock to serialize removal from the client_data and
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* getting a new reference, we use an RCU grace period. The destruction
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* path removes the device from client_data and then waits for all RCU
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* readers to finish.
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*
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* A new connection can get NULL from this if its arriving on a
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* device that is in the process of being removed.
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*/
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struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
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{
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struct rds_ib_device *rds_ibdev;
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rcu_read_lock();
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rds_ibdev = ib_get_client_data(device, &rds_ib_client);
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if (rds_ibdev)
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atomic_inc(&rds_ibdev->refcount);
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rcu_read_unlock();
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return rds_ibdev;
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}
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/*
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* The IB stack is letting us know that a device is going away. This can
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* happen if the underlying HCA driver is removed or if PCI hotplug is removing
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* the pci function, for example.
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*
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* This can be called at any time and can be racing with any other RDS path.
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*/
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static void rds_ib_remove_one(struct ib_device *device)
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{
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struct rds_ib_device *rds_ibdev;
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rds_ibdev = ib_get_client_data(device, &rds_ib_client);
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if (!rds_ibdev)
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return;
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rds_ib_dev_shutdown(rds_ibdev);
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/* stop connection attempts from getting a reference to this device. */
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ib_set_client_data(device, &rds_ib_client, NULL);
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down_write(&rds_ib_devices_lock);
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list_del_rcu(&rds_ibdev->list);
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up_write(&rds_ib_devices_lock);
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/*
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* This synchronize rcu is waiting for readers of both the ib
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* client data and the devices list to finish before we drop
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* both of those references.
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*/
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synchronize_rcu();
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rds_ib_dev_put(rds_ibdev);
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rds_ib_dev_put(rds_ibdev);
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}
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struct ib_client rds_ib_client = {
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.name = "rds_ib",
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.add = rds_ib_add_one,
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.remove = rds_ib_remove_one
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};
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static int rds_ib_conn_info_visitor(struct rds_connection *conn,
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void *buffer)
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{
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struct rds_info_rdma_connection *iinfo = buffer;
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struct rds_ib_connection *ic;
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/* We will only ever look at IB transports */
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if (conn->c_trans != &rds_ib_transport)
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return 0;
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iinfo->src_addr = conn->c_laddr;
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iinfo->dst_addr = conn->c_faddr;
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memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
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memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
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if (rds_conn_state(conn) == RDS_CONN_UP) {
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struct rds_ib_device *rds_ibdev;
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struct rdma_dev_addr *dev_addr;
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ic = conn->c_transport_data;
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dev_addr = &ic->i_cm_id->route.addr.dev_addr;
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rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
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rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
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rds_ibdev = ic->rds_ibdev;
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iinfo->max_send_wr = ic->i_send_ring.w_nr;
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iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
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iinfo->max_send_sge = rds_ibdev->max_sge;
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rds_ib_get_mr_info(rds_ibdev, iinfo);
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}
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return 1;
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}
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static void rds_ib_ic_info(struct socket *sock, unsigned int len,
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struct rds_info_iterator *iter,
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struct rds_info_lengths *lens)
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{
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rds_for_each_conn_info(sock, len, iter, lens,
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rds_ib_conn_info_visitor,
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sizeof(struct rds_info_rdma_connection));
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}
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/*
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* Early RDS/IB was built to only bind to an address if there is an IPoIB
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* device with that address set.
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*
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* If it were me, I'd advocate for something more flexible. Sending and
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* receiving should be device-agnostic. Transports would try and maintain
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* connections between peers who have messages queued. Userspace would be
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* allowed to influence which paths have priority. We could call userspace
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* asserting this policy "routing".
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*/
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static int rds_ib_laddr_check(struct net *net, __be32 addr)
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{
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int ret;
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struct rdma_cm_id *cm_id;
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struct sockaddr_in sin;
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/* Create a CMA ID and try to bind it. This catches both
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* IB and iWARP capable NICs.
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*/
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cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
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if (IS_ERR(cm_id))
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return PTR_ERR(cm_id);
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = addr;
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/* rdma_bind_addr will only succeed for IB & iWARP devices */
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ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
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/* due to this, we will claim to support iWARP devices unless we
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check node_type. */
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if (ret || !cm_id->device ||
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cm_id->device->node_type != RDMA_NODE_IB_CA)
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ret = -EADDRNOTAVAIL;
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rdsdebug("addr %pI4 ret %d node type %d\n",
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&addr, ret,
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cm_id->device ? cm_id->device->node_type : -1);
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rdma_destroy_id(cm_id);
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return ret;
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}
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static void rds_ib_unregister_client(void)
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{
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ib_unregister_client(&rds_ib_client);
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/* wait for rds_ib_dev_free() to complete */
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flush_workqueue(rds_wq);
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}
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void rds_ib_exit(void)
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{
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rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
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rds_ib_unregister_client();
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rds_ib_destroy_nodev_conns();
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rds_ib_sysctl_exit();
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rds_ib_recv_exit();
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rds_trans_unregister(&rds_ib_transport);
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rds_ib_fmr_exit();
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}
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struct rds_transport rds_ib_transport = {
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.laddr_check = rds_ib_laddr_check,
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.xmit_complete = rds_ib_xmit_complete,
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.xmit = rds_ib_xmit,
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.xmit_rdma = rds_ib_xmit_rdma,
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.xmit_atomic = rds_ib_xmit_atomic,
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.recv = rds_ib_recv,
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.conn_alloc = rds_ib_conn_alloc,
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.conn_free = rds_ib_conn_free,
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.conn_connect = rds_ib_conn_connect,
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.conn_shutdown = rds_ib_conn_shutdown,
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.inc_copy_to_user = rds_ib_inc_copy_to_user,
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.inc_free = rds_ib_inc_free,
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.cm_initiate_connect = rds_ib_cm_initiate_connect,
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.cm_handle_connect = rds_ib_cm_handle_connect,
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.cm_connect_complete = rds_ib_cm_connect_complete,
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.stats_info_copy = rds_ib_stats_info_copy,
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.exit = rds_ib_exit,
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.get_mr = rds_ib_get_mr,
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.sync_mr = rds_ib_sync_mr,
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.free_mr = rds_ib_free_mr,
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.flush_mrs = rds_ib_flush_mrs,
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.t_owner = THIS_MODULE,
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.t_name = "infiniband",
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.t_type = RDS_TRANS_IB
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};
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int rds_ib_init(void)
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{
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int ret;
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INIT_LIST_HEAD(&rds_ib_devices);
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ret = rds_ib_fmr_init();
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if (ret)
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goto out;
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ret = ib_register_client(&rds_ib_client);
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if (ret)
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goto out_fmr_exit;
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ret = rds_ib_sysctl_init();
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if (ret)
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goto out_ibreg;
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ret = rds_ib_recv_init();
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if (ret)
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goto out_sysctl;
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ret = rds_trans_register(&rds_ib_transport);
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if (ret)
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goto out_recv;
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rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
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goto out;
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out_recv:
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rds_ib_recv_exit();
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out_sysctl:
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rds_ib_sysctl_exit();
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out_ibreg:
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rds_ib_unregister_client();
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out_fmr_exit:
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rds_ib_fmr_exit();
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out:
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return ret;
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}
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MODULE_LICENSE("GPL");
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