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![Mark Bloch](/assets/img/avatar_default.png)
Current code uses many different types when dealing with a port of a RDMA device: u8, unsigned int and u32. Switch to u32 to clean up the logic. This allows us to make (at least) the core view consistent and use the same type. Unfortunately not all places can be converted. Many uverbs functions expect port to be u8 so keep those places in order not to break UAPIs. HW/Spec defined values must also not be changed. With the switch to u32 we now can support devices with more than 255 ports. U32_MAX is reserved to make control logic a bit easier to deal with. As a device with U32_MAX ports probably isn't going to happen any time soon this seems like a non issue. When a device with more than 255 ports is created uverbs will report the RDMA device as having 255 ports as this is the max currently supported. The verbs interface is not changed yet because the IBTA spec limits the port size in too many places to be u8 and all applications that relies in verbs won't be able to cope with this change. At this stage, we are extending the interfaces that are using vendor channel solely Once the limitation is lifted mlx5 in switchdev mode will be able to have thousands of SFs created by the device. As the only instance of an RDMA device that reports more than 255 ports will be a representor device and it exposes itself as a RAW Ethernet only device CM/MAD/IPoIB and other ULPs aren't effected by this change and their sysfs/interfaces that are exposes to userspace can remain unchanged. While here cleanup some alignment issues and remove unneeded sanity checks (mainly in rdmavt), Link: https://lore.kernel.org/r/20210301070420.439400-1-leon@kernel.org Signed-off-by: Mark Bloch <mbloch@nvidia.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
341 lines
9.9 KiB
C
341 lines
9.9 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2004 Voltaire, Inc. 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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#include <linux/string.h>
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#include <linux/slab.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_mad.h>
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#include <rdma/ib_smi.h>
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#include "mthca_dev.h"
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#include "mthca_cmd.h"
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enum {
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MTHCA_VENDOR_CLASS1 = 0x9,
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MTHCA_VENDOR_CLASS2 = 0xa
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};
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static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
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{
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struct ib_port_attr *tprops = NULL;
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int ret;
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tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
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if (!tprops)
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return -ENOMEM;
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ret = ib_query_port(&dev->ib_dev, port_num, tprops);
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if (ret) {
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dev_warn(&dev->ib_dev.dev,
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"ib_query_port failed (%d) forport %d\n", ret,
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port_num);
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goto out;
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}
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dev->rate[port_num - 1] = tprops->active_speed *
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ib_width_enum_to_int(tprops->active_width);
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out:
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kfree(tprops);
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return ret;
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}
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static void update_sm_ah(struct mthca_dev *dev,
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u8 port_num, u16 lid, u8 sl)
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{
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struct ib_ah *new_ah;
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struct rdma_ah_attr ah_attr;
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unsigned long flags;
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if (!dev->send_agent[port_num - 1][0])
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return;
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memset(&ah_attr, 0, sizeof ah_attr);
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ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num);
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rdma_ah_set_dlid(&ah_attr, lid);
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rdma_ah_set_sl(&ah_attr, sl);
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rdma_ah_set_port_num(&ah_attr, port_num);
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new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
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&ah_attr, 0);
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if (IS_ERR(new_ah))
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return;
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spin_lock_irqsave(&dev->sm_lock, flags);
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if (dev->sm_ah[port_num - 1])
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rdma_destroy_ah(dev->sm_ah[port_num - 1], 0);
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dev->sm_ah[port_num - 1] = new_ah;
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spin_unlock_irqrestore(&dev->sm_lock, flags);
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}
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/*
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* Snoop SM MADs for port info and P_Key table sets, so we can
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* synthesize LID change and P_Key change events.
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*/
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static void smp_snoop(struct ib_device *ibdev,
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u8 port_num,
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const struct ib_mad *mad,
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u16 prev_lid)
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{
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struct ib_event event;
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if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
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mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
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mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
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if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
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struct ib_port_info *pinfo =
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(struct ib_port_info *) ((struct ib_smp *) mad)->data;
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u16 lid = be16_to_cpu(pinfo->lid);
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mthca_update_rate(to_mdev(ibdev), port_num);
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update_sm_ah(to_mdev(ibdev), port_num,
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be16_to_cpu(pinfo->sm_lid),
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pinfo->neighbormtu_mastersmsl & 0xf);
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event.device = ibdev;
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event.element.port_num = port_num;
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if (pinfo->clientrereg_resv_subnetto & 0x80) {
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event.event = IB_EVENT_CLIENT_REREGISTER;
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ib_dispatch_event(&event);
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}
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if (prev_lid != lid) {
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event.event = IB_EVENT_LID_CHANGE;
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ib_dispatch_event(&event);
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}
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}
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if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
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event.device = ibdev;
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event.event = IB_EVENT_PKEY_CHANGE;
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event.element.port_num = port_num;
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ib_dispatch_event(&event);
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}
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}
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}
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static void node_desc_override(struct ib_device *dev,
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struct ib_mad *mad)
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{
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if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
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mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
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mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
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mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
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mutex_lock(&to_mdev(dev)->cap_mask_mutex);
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memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
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IB_DEVICE_NODE_DESC_MAX);
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mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
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}
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}
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static void forward_trap(struct mthca_dev *dev,
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u32 port_num,
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const struct ib_mad *mad)
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{
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int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
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struct ib_mad_send_buf *send_buf;
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struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
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int ret;
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unsigned long flags;
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if (agent) {
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send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
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IB_MGMT_MAD_DATA, GFP_ATOMIC,
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IB_MGMT_BASE_VERSION);
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if (IS_ERR(send_buf))
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return;
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/*
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* We rely here on the fact that MLX QPs don't use the
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* address handle after the send is posted (this is
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* wrong following the IB spec strictly, but we know
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* it's OK for our devices).
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*/
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spin_lock_irqsave(&dev->sm_lock, flags);
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memcpy(send_buf->mad, mad, sizeof *mad);
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if ((send_buf->ah = dev->sm_ah[port_num - 1]))
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ret = ib_post_send_mad(send_buf, NULL);
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else
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ret = -EINVAL;
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spin_unlock_irqrestore(&dev->sm_lock, flags);
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if (ret)
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ib_free_send_mad(send_buf);
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}
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}
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int mthca_process_mad(struct ib_device *ibdev, int mad_flags, u32 port_num,
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const struct ib_wc *in_wc, const struct ib_grh *in_grh,
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const struct ib_mad *in, struct ib_mad *out,
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size_t *out_mad_size, u16 *out_mad_pkey_index)
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{
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int err;
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u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
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u16 prev_lid = 0;
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struct ib_port_attr pattr;
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/* Forward locally generated traps to the SM */
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if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP && !slid) {
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forward_trap(to_mdev(ibdev), port_num, in);
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return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
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}
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/*
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* Only handle SM gets, sets and trap represses for SM class
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*
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* Only handle PMA and Mellanox vendor-specific class gets and
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* sets for other classes.
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*/
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if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
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in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
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if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&
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in->mad_hdr.method != IB_MGMT_METHOD_SET &&
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in->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
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return IB_MAD_RESULT_SUCCESS;
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/*
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* Don't process SMInfo queries or vendor-specific
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* MADs -- the SMA can't handle them.
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*/
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if (in->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
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((in->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
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IB_SMP_ATTR_VENDOR_MASK))
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return IB_MAD_RESULT_SUCCESS;
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} else if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
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in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 ||
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in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
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if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&
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in->mad_hdr.method != IB_MGMT_METHOD_SET)
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return IB_MAD_RESULT_SUCCESS;
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} else
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return IB_MAD_RESULT_SUCCESS;
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if ((in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
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in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
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in->mad_hdr.method == IB_MGMT_METHOD_SET &&
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in->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
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!ib_query_port(ibdev, port_num, &pattr))
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prev_lid = ib_lid_cpu16(pattr.lid);
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err = mthca_MAD_IFC(to_mdev(ibdev), mad_flags & IB_MAD_IGNORE_MKEY,
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mad_flags & IB_MAD_IGNORE_BKEY, port_num, in_wc,
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in_grh, in, out);
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if (err == -EBADMSG)
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return IB_MAD_RESULT_SUCCESS;
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else if (err) {
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mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
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return IB_MAD_RESULT_FAILURE;
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}
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if (!out->mad_hdr.status) {
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smp_snoop(ibdev, port_num, in, prev_lid);
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node_desc_override(ibdev, out);
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}
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/* set return bit in status of directed route responses */
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if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
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out->mad_hdr.status |= cpu_to_be16(1 << 15);
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if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
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/* no response for trap repress */
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return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
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return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
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}
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static void send_handler(struct ib_mad_agent *agent,
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struct ib_mad_send_wc *mad_send_wc)
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{
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ib_free_send_mad(mad_send_wc->send_buf);
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}
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int mthca_create_agents(struct mthca_dev *dev)
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{
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struct ib_mad_agent *agent;
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int p, q;
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int ret;
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spin_lock_init(&dev->sm_lock);
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for (p = 0; p < dev->limits.num_ports; ++p)
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for (q = 0; q <= 1; ++q) {
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agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
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q ? IB_QPT_GSI : IB_QPT_SMI,
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NULL, 0, send_handler,
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NULL, NULL, 0);
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if (IS_ERR(agent)) {
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ret = PTR_ERR(agent);
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goto err;
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}
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dev->send_agent[p][q] = agent;
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}
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for (p = 1; p <= dev->limits.num_ports; ++p) {
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ret = mthca_update_rate(dev, p);
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if (ret) {
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mthca_err(dev, "Failed to obtain port %d rate."
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" aborting.\n", p);
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goto err;
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}
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}
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return 0;
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err:
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for (p = 0; p < dev->limits.num_ports; ++p)
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for (q = 0; q <= 1; ++q)
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if (dev->send_agent[p][q])
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ib_unregister_mad_agent(dev->send_agent[p][q]);
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return ret;
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}
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void mthca_free_agents(struct mthca_dev *dev)
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{
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struct ib_mad_agent *agent;
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int p, q;
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for (p = 0; p < dev->limits.num_ports; ++p) {
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for (q = 0; q <= 1; ++q) {
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agent = dev->send_agent[p][q];
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dev->send_agent[p][q] = NULL;
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ib_unregister_mad_agent(agent);
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}
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if (dev->sm_ah[p])
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rdma_destroy_ah(dev->sm_ah[p],
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RDMA_DESTROY_AH_SLEEPABLE);
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}
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}
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