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![Andy Grover](/assets/img/avatar_default.png)
Now that transports can be loaded in arbitrary order, it is important for rds_trans_get_preferred() to look for them in a particular order, instead of walking the list until it finds a transport that works for a given address. Now, each transport registers for a specific transport slot, and these are ordered so that preferred transports come first, and then if they are not loaded, other transports are queried. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
328 lines
8.8 KiB
C
328 lines
8.8 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 "rds.h"
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#include "iw.h"
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unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
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unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
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module_param(fastreg_pool_size, int, 0444);
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MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
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module_param(fastreg_message_size, int, 0444);
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MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
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struct list_head rds_iw_devices;
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/* NOTE: if also grabbing iwdev lock, grab this first */
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DEFINE_SPINLOCK(iw_nodev_conns_lock);
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LIST_HEAD(iw_nodev_conns);
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void rds_iw_add_one(struct ib_device *device)
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{
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struct rds_iw_device *rds_iwdev;
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struct ib_device_attr *dev_attr;
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/* Only handle iwarp devices */
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if (device->node_type != RDMA_NODE_RNIC)
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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_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL);
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if (!rds_iwdev)
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goto free_attr;
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spin_lock_init(&rds_iwdev->spinlock);
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rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY);
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rds_iwdev->max_wrs = dev_attr->max_qp_wr;
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rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE);
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rds_iwdev->dev = device;
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rds_iwdev->pd = ib_alloc_pd(device);
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if (IS_ERR(rds_iwdev->pd))
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goto free_dev;
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if (!rds_iwdev->dma_local_lkey) {
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rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
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IB_ACCESS_REMOTE_READ |
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IB_ACCESS_REMOTE_WRITE |
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IB_ACCESS_LOCAL_WRITE);
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if (IS_ERR(rds_iwdev->mr))
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goto err_pd;
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} else
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rds_iwdev->mr = NULL;
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rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev);
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if (IS_ERR(rds_iwdev->mr_pool)) {
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rds_iwdev->mr_pool = NULL;
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goto err_mr;
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}
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INIT_LIST_HEAD(&rds_iwdev->cm_id_list);
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INIT_LIST_HEAD(&rds_iwdev->conn_list);
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list_add_tail(&rds_iwdev->list, &rds_iw_devices);
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ib_set_client_data(device, &rds_iw_client, rds_iwdev);
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goto free_attr;
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err_mr:
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if (rds_iwdev->mr)
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ib_dereg_mr(rds_iwdev->mr);
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err_pd:
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ib_dealloc_pd(rds_iwdev->pd);
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free_dev:
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kfree(rds_iwdev);
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free_attr:
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kfree(dev_attr);
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}
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void rds_iw_remove_one(struct ib_device *device)
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{
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struct rds_iw_device *rds_iwdev;
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struct rds_iw_cm_id *i_cm_id, *next;
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rds_iwdev = ib_get_client_data(device, &rds_iw_client);
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if (!rds_iwdev)
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return;
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spin_lock_irq(&rds_iwdev->spinlock);
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list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) {
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list_del(&i_cm_id->list);
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kfree(i_cm_id);
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}
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spin_unlock_irq(&rds_iwdev->spinlock);
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rds_iw_destroy_conns(rds_iwdev);
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if (rds_iwdev->mr_pool)
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rds_iw_destroy_mr_pool(rds_iwdev->mr_pool);
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if (rds_iwdev->mr)
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ib_dereg_mr(rds_iwdev->mr);
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while (ib_dealloc_pd(rds_iwdev->pd)) {
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rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd);
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msleep(1);
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}
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list_del(&rds_iwdev->list);
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kfree(rds_iwdev);
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}
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struct ib_client rds_iw_client = {
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.name = "rds_iw",
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.add = rds_iw_add_one,
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.remove = rds_iw_remove_one
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};
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static int rds_iw_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_iw_connection *ic;
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/* We will only ever look at IB transports */
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if (conn->c_trans != &rds_iw_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_iw_device *rds_iwdev;
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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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ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
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ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
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rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
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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_iwdev->max_sge;
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rds_iw_get_mr_info(rds_iwdev, iinfo);
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}
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return 1;
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}
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static void rds_iw_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_iw_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_iw_laddr_check(__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);
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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 IB devices unless we
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check node_type. */
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if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
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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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void rds_iw_exit(void)
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{
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rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
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rds_iw_destroy_nodev_conns();
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ib_unregister_client(&rds_iw_client);
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rds_iw_sysctl_exit();
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rds_iw_recv_exit();
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rds_trans_unregister(&rds_iw_transport);
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}
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struct rds_transport rds_iw_transport = {
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.laddr_check = rds_iw_laddr_check,
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.xmit_complete = rds_iw_xmit_complete,
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.xmit = rds_iw_xmit,
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.xmit_cong_map = NULL,
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.xmit_rdma = rds_iw_xmit_rdma,
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.recv = rds_iw_recv,
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.conn_alloc = rds_iw_conn_alloc,
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.conn_free = rds_iw_conn_free,
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.conn_connect = rds_iw_conn_connect,
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.conn_shutdown = rds_iw_conn_shutdown,
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.inc_copy_to_user = rds_iw_inc_copy_to_user,
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.inc_purge = rds_iw_inc_purge,
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.inc_free = rds_iw_inc_free,
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.cm_initiate_connect = rds_iw_cm_initiate_connect,
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.cm_handle_connect = rds_iw_cm_handle_connect,
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.cm_connect_complete = rds_iw_cm_connect_complete,
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.stats_info_copy = rds_iw_stats_info_copy,
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.exit = rds_iw_exit,
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.get_mr = rds_iw_get_mr,
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.sync_mr = rds_iw_sync_mr,
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.free_mr = rds_iw_free_mr,
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.flush_mrs = rds_iw_flush_mrs,
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.t_owner = THIS_MODULE,
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.t_name = "iwarp",
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.t_type = RDS_TRANS_IWARP,
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.t_prefer_loopback = 1,
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};
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int __init rds_iw_init(void)
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{
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int ret;
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INIT_LIST_HEAD(&rds_iw_devices);
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ret = ib_register_client(&rds_iw_client);
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if (ret)
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goto out;
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ret = rds_iw_sysctl_init();
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if (ret)
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goto out_ibreg;
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ret = rds_iw_recv_init();
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if (ret)
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goto out_sysctl;
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ret = rds_trans_register(&rds_iw_transport);
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if (ret)
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goto out_recv;
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rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
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goto out;
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out_recv:
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rds_iw_recv_exit();
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out_sysctl:
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rds_iw_sysctl_exit();
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out_ibreg:
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ib_unregister_client(&rds_iw_client);
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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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