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verbs.c
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verbs.c
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/*
* Copyright (c) 2004 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2004 Infinicon Corporation. All rights reserved.
* Copyright (c) 2004 Intel Corporation. All rights reserved.
* Copyright (c) 2004 Topspin Corporation. All rights reserved.
* Copyright (c) 2004 Voltaire Corporation. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <net/addrconf.h>
#include <linux/security.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_addr.h>
#include <rdma/rw.h>
#include <rdma/lag.h>
#include "core_priv.h"
#include <trace/events/rdma_core.h>
static int ib_resolve_eth_dmac(struct ib_device *device,
struct rdma_ah_attr *ah_attr);
static const char * const ib_events[] = {
[IB_EVENT_CQ_ERR] = "CQ error",
[IB_EVENT_QP_FATAL] = "QP fatal error",
[IB_EVENT_QP_REQ_ERR] = "QP request error",
[IB_EVENT_QP_ACCESS_ERR] = "QP access error",
[IB_EVENT_COMM_EST] = "communication established",
[IB_EVENT_SQ_DRAINED] = "send queue drained",
[IB_EVENT_PATH_MIG] = "path migration successful",
[IB_EVENT_PATH_MIG_ERR] = "path migration error",
[IB_EVENT_DEVICE_FATAL] = "device fatal error",
[IB_EVENT_PORT_ACTIVE] = "port active",
[IB_EVENT_PORT_ERR] = "port error",
[IB_EVENT_LID_CHANGE] = "LID change",
[IB_EVENT_PKEY_CHANGE] = "P_key change",
[IB_EVENT_SM_CHANGE] = "SM change",
[IB_EVENT_SRQ_ERR] = "SRQ error",
[IB_EVENT_SRQ_LIMIT_REACHED] = "SRQ limit reached",
[IB_EVENT_QP_LAST_WQE_REACHED] = "last WQE reached",
[IB_EVENT_CLIENT_REREGISTER] = "client reregister",
[IB_EVENT_GID_CHANGE] = "GID changed",
};
const char *__attribute_const__ ib_event_msg(enum ib_event_type event)
{
size_t index = event;
return (index < ARRAY_SIZE(ib_events) && ib_events[index]) ?
ib_events[index] : "unrecognized event";
}
EXPORT_SYMBOL(ib_event_msg);
static const char * const wc_statuses[] = {
[IB_WC_SUCCESS] = "success",
[IB_WC_LOC_LEN_ERR] = "local length error",
[IB_WC_LOC_QP_OP_ERR] = "local QP operation error",
[IB_WC_LOC_EEC_OP_ERR] = "local EE context operation error",
[IB_WC_LOC_PROT_ERR] = "local protection error",
[IB_WC_WR_FLUSH_ERR] = "WR flushed",
[IB_WC_MW_BIND_ERR] = "memory bind operation error",
[IB_WC_BAD_RESP_ERR] = "bad response error",
[IB_WC_LOC_ACCESS_ERR] = "local access error",
[IB_WC_REM_INV_REQ_ERR] = "remote invalid request error",
[IB_WC_REM_ACCESS_ERR] = "remote access error",
[IB_WC_REM_OP_ERR] = "remote operation error",
[IB_WC_RETRY_EXC_ERR] = "transport retry counter exceeded",
[IB_WC_RNR_RETRY_EXC_ERR] = "RNR retry counter exceeded",
[IB_WC_LOC_RDD_VIOL_ERR] = "local RDD violation error",
[IB_WC_REM_INV_RD_REQ_ERR] = "remote invalid RD request",
[IB_WC_REM_ABORT_ERR] = "operation aborted",
[IB_WC_INV_EECN_ERR] = "invalid EE context number",
[IB_WC_INV_EEC_STATE_ERR] = "invalid EE context state",
[IB_WC_FATAL_ERR] = "fatal error",
[IB_WC_RESP_TIMEOUT_ERR] = "response timeout error",
[IB_WC_GENERAL_ERR] = "general error",
};
const char *__attribute_const__ ib_wc_status_msg(enum ib_wc_status status)
{
size_t index = status;
return (index < ARRAY_SIZE(wc_statuses) && wc_statuses[index]) ?
wc_statuses[index] : "unrecognized status";
}
EXPORT_SYMBOL(ib_wc_status_msg);
__attribute_const__ int ib_rate_to_mult(enum ib_rate rate)
{
switch (rate) {
case IB_RATE_2_5_GBPS: return 1;
case IB_RATE_5_GBPS: return 2;
case IB_RATE_10_GBPS: return 4;
case IB_RATE_20_GBPS: return 8;
case IB_RATE_30_GBPS: return 12;
case IB_RATE_40_GBPS: return 16;
case IB_RATE_60_GBPS: return 24;
case IB_RATE_80_GBPS: return 32;
case IB_RATE_120_GBPS: return 48;
case IB_RATE_14_GBPS: return 6;
case IB_RATE_56_GBPS: return 22;
case IB_RATE_112_GBPS: return 45;
case IB_RATE_168_GBPS: return 67;
case IB_RATE_25_GBPS: return 10;
case IB_RATE_100_GBPS: return 40;
case IB_RATE_200_GBPS: return 80;
case IB_RATE_300_GBPS: return 120;
case IB_RATE_28_GBPS: return 11;
case IB_RATE_50_GBPS: return 20;
case IB_RATE_400_GBPS: return 160;
case IB_RATE_600_GBPS: return 240;
default: return -1;
}
}
EXPORT_SYMBOL(ib_rate_to_mult);
__attribute_const__ enum ib_rate mult_to_ib_rate(int mult)
{
switch (mult) {
case 1: return IB_RATE_2_5_GBPS;
case 2: return IB_RATE_5_GBPS;
case 4: return IB_RATE_10_GBPS;
case 8: return IB_RATE_20_GBPS;
case 12: return IB_RATE_30_GBPS;
case 16: return IB_RATE_40_GBPS;
case 24: return IB_RATE_60_GBPS;
case 32: return IB_RATE_80_GBPS;
case 48: return IB_RATE_120_GBPS;
case 6: return IB_RATE_14_GBPS;
case 22: return IB_RATE_56_GBPS;
case 45: return IB_RATE_112_GBPS;
case 67: return IB_RATE_168_GBPS;
case 10: return IB_RATE_25_GBPS;
case 40: return IB_RATE_100_GBPS;
case 80: return IB_RATE_200_GBPS;
case 120: return IB_RATE_300_GBPS;
case 11: return IB_RATE_28_GBPS;
case 20: return IB_RATE_50_GBPS;
case 160: return IB_RATE_400_GBPS;
case 240: return IB_RATE_600_GBPS;
default: return IB_RATE_PORT_CURRENT;
}
}
EXPORT_SYMBOL(mult_to_ib_rate);
__attribute_const__ int ib_rate_to_mbps(enum ib_rate rate)
{
switch (rate) {
case IB_RATE_2_5_GBPS: return 2500;
case IB_RATE_5_GBPS: return 5000;
case IB_RATE_10_GBPS: return 10000;
case IB_RATE_20_GBPS: return 20000;
case IB_RATE_30_GBPS: return 30000;
case IB_RATE_40_GBPS: return 40000;
case IB_RATE_60_GBPS: return 60000;
case IB_RATE_80_GBPS: return 80000;
case IB_RATE_120_GBPS: return 120000;
case IB_RATE_14_GBPS: return 14062;
case IB_RATE_56_GBPS: return 56250;
case IB_RATE_112_GBPS: return 112500;
case IB_RATE_168_GBPS: return 168750;
case IB_RATE_25_GBPS: return 25781;
case IB_RATE_100_GBPS: return 103125;
case IB_RATE_200_GBPS: return 206250;
case IB_RATE_300_GBPS: return 309375;
case IB_RATE_28_GBPS: return 28125;
case IB_RATE_50_GBPS: return 53125;
case IB_RATE_400_GBPS: return 425000;
case IB_RATE_600_GBPS: return 637500;
default: return -1;
}
}
EXPORT_SYMBOL(ib_rate_to_mbps);
__attribute_const__ enum rdma_transport_type
rdma_node_get_transport(unsigned int node_type)
{
if (node_type == RDMA_NODE_USNIC)
return RDMA_TRANSPORT_USNIC;
if (node_type == RDMA_NODE_USNIC_UDP)
return RDMA_TRANSPORT_USNIC_UDP;
if (node_type == RDMA_NODE_RNIC)
return RDMA_TRANSPORT_IWARP;
if (node_type == RDMA_NODE_UNSPECIFIED)
return RDMA_TRANSPORT_UNSPECIFIED;
return RDMA_TRANSPORT_IB;
}
EXPORT_SYMBOL(rdma_node_get_transport);
enum rdma_link_layer rdma_port_get_link_layer(struct ib_device *device,
u32 port_num)
{
enum rdma_transport_type lt;
if (device->ops.get_link_layer)
return device->ops.get_link_layer(device, port_num);
lt = rdma_node_get_transport(device->node_type);
if (lt == RDMA_TRANSPORT_IB)
return IB_LINK_LAYER_INFINIBAND;
return IB_LINK_LAYER_ETHERNET;
}
EXPORT_SYMBOL(rdma_port_get_link_layer);
/* Protection domains */
/**
* __ib_alloc_pd - Allocates an unused protection domain.
* @device: The device on which to allocate the protection domain.
* @flags: protection domain flags
* @caller: caller's build-time module name
*
* A protection domain object provides an association between QPs, shared
* receive queues, address handles, memory regions, and memory windows.
*
* Every PD has a local_dma_lkey which can be used as the lkey value for local
* memory operations.
*/
struct ib_pd *__ib_alloc_pd(struct ib_device *device, unsigned int flags,
const char *caller)
{
struct ib_pd *pd;
int mr_access_flags = 0;
int ret;
pd = rdma_zalloc_drv_obj(device, ib_pd);
if (!pd)
return ERR_PTR(-ENOMEM);
pd->device = device;
pd->flags = flags;
rdma_restrack_new(&pd->res, RDMA_RESTRACK_PD);
rdma_restrack_set_name(&pd->res, caller);
ret = device->ops.alloc_pd(pd, NULL);
if (ret) {
rdma_restrack_put(&pd->res);
kfree(pd);
return ERR_PTR(ret);
}
rdma_restrack_add(&pd->res);
if (device->attrs.kernel_cap_flags & IBK_LOCAL_DMA_LKEY)
pd->local_dma_lkey = device->local_dma_lkey;
else
mr_access_flags |= IB_ACCESS_LOCAL_WRITE;
if (flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
pr_warn("%s: enabling unsafe global rkey\n", caller);
mr_access_flags |= IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE;
}
if (mr_access_flags) {
struct ib_mr *mr;
mr = pd->device->ops.get_dma_mr(pd, mr_access_flags);
if (IS_ERR(mr)) {
ib_dealloc_pd(pd);
return ERR_CAST(mr);
}
mr->device = pd->device;
mr->pd = pd;
mr->type = IB_MR_TYPE_DMA;
mr->uobject = NULL;
mr->need_inval = false;
pd->__internal_mr = mr;
if (!(device->attrs.kernel_cap_flags & IBK_LOCAL_DMA_LKEY))
pd->local_dma_lkey = pd->__internal_mr->lkey;
if (flags & IB_PD_UNSAFE_GLOBAL_RKEY)
pd->unsafe_global_rkey = pd->__internal_mr->rkey;
}
return pd;
}
EXPORT_SYMBOL(__ib_alloc_pd);
/**
* ib_dealloc_pd_user - Deallocates a protection domain.
* @pd: The protection domain to deallocate.
* @udata: Valid user data or NULL for kernel object
*
* It is an error to call this function while any resources in the pd still
* exist. The caller is responsible to synchronously destroy them and
* guarantee no new allocations will happen.
*/
int ib_dealloc_pd_user(struct ib_pd *pd, struct ib_udata *udata)
{
int ret;
if (pd->__internal_mr) {
ret = pd->device->ops.dereg_mr(pd->__internal_mr, NULL);
WARN_ON(ret);
pd->__internal_mr = NULL;
}
ret = pd->device->ops.dealloc_pd(pd, udata);
if (ret)
return ret;
rdma_restrack_del(&pd->res);
kfree(pd);
return ret;
}
EXPORT_SYMBOL(ib_dealloc_pd_user);
/* Address handles */
/**
* rdma_copy_ah_attr - Copy rdma ah attribute from source to destination.
* @dest: Pointer to destination ah_attr. Contents of the destination
* pointer is assumed to be invalid and attribute are overwritten.
* @src: Pointer to source ah_attr.
*/
void rdma_copy_ah_attr(struct rdma_ah_attr *dest,
const struct rdma_ah_attr *src)
{
*dest = *src;
if (dest->grh.sgid_attr)
rdma_hold_gid_attr(dest->grh.sgid_attr);
}
EXPORT_SYMBOL(rdma_copy_ah_attr);
/**
* rdma_replace_ah_attr - Replace valid ah_attr with new new one.
* @old: Pointer to existing ah_attr which needs to be replaced.
* old is assumed to be valid or zero'd
* @new: Pointer to the new ah_attr.
*
* rdma_replace_ah_attr() first releases any reference in the old ah_attr if
* old the ah_attr is valid; after that it copies the new attribute and holds
* the reference to the replaced ah_attr.
*/
void rdma_replace_ah_attr(struct rdma_ah_attr *old,
const struct rdma_ah_attr *new)
{
rdma_destroy_ah_attr(old);
*old = *new;
if (old->grh.sgid_attr)
rdma_hold_gid_attr(old->grh.sgid_attr);
}
EXPORT_SYMBOL(rdma_replace_ah_attr);
/**
* rdma_move_ah_attr - Move ah_attr pointed by source to destination.
* @dest: Pointer to destination ah_attr to copy to.
* dest is assumed to be valid or zero'd
* @src: Pointer to the new ah_attr.
*
* rdma_move_ah_attr() first releases any reference in the destination ah_attr
* if it is valid. This also transfers ownership of internal references from
* src to dest, making src invalid in the process. No new reference of the src
* ah_attr is taken.
*/
void rdma_move_ah_attr(struct rdma_ah_attr *dest, struct rdma_ah_attr *src)
{
rdma_destroy_ah_attr(dest);
*dest = *src;
src->grh.sgid_attr = NULL;
}
EXPORT_SYMBOL(rdma_move_ah_attr);
/*
* Validate that the rdma_ah_attr is valid for the device before passing it
* off to the driver.
*/
static int rdma_check_ah_attr(struct ib_device *device,
struct rdma_ah_attr *ah_attr)
{
if (!rdma_is_port_valid(device, ah_attr->port_num))
return -EINVAL;
if ((rdma_is_grh_required(device, ah_attr->port_num) ||
ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) &&
!(ah_attr->ah_flags & IB_AH_GRH))
return -EINVAL;
if (ah_attr->grh.sgid_attr) {
/*
* Make sure the passed sgid_attr is consistent with the
* parameters
*/
if (ah_attr->grh.sgid_attr->index != ah_attr->grh.sgid_index ||
ah_attr->grh.sgid_attr->port_num != ah_attr->port_num)
return -EINVAL;
}
return 0;
}
/*
* If the ah requires a GRH then ensure that sgid_attr pointer is filled in.
* On success the caller is responsible to call rdma_unfill_sgid_attr().
*/
static int rdma_fill_sgid_attr(struct ib_device *device,
struct rdma_ah_attr *ah_attr,
const struct ib_gid_attr **old_sgid_attr)
{
const struct ib_gid_attr *sgid_attr;
struct ib_global_route *grh;
int ret;
*old_sgid_attr = ah_attr->grh.sgid_attr;
ret = rdma_check_ah_attr(device, ah_attr);
if (ret)
return ret;
if (!(ah_attr->ah_flags & IB_AH_GRH))
return 0;
grh = rdma_ah_retrieve_grh(ah_attr);
if (grh->sgid_attr)
return 0;
sgid_attr =
rdma_get_gid_attr(device, ah_attr->port_num, grh->sgid_index);
if (IS_ERR(sgid_attr))
return PTR_ERR(sgid_attr);
/* Move ownerhip of the kref into the ah_attr */
grh->sgid_attr = sgid_attr;
return 0;
}
static void rdma_unfill_sgid_attr(struct rdma_ah_attr *ah_attr,
const struct ib_gid_attr *old_sgid_attr)
{
/*
* Fill didn't change anything, the caller retains ownership of
* whatever it passed
*/
if (ah_attr->grh.sgid_attr == old_sgid_attr)
return;
/*
* Otherwise, we need to undo what rdma_fill_sgid_attr so the caller
* doesn't see any change in the rdma_ah_attr. If we get here
* old_sgid_attr is NULL.
*/
rdma_destroy_ah_attr(ah_attr);
}
static const struct ib_gid_attr *
rdma_update_sgid_attr(struct rdma_ah_attr *ah_attr,
const struct ib_gid_attr *old_attr)
{
if (old_attr)
rdma_put_gid_attr(old_attr);
if (ah_attr->ah_flags & IB_AH_GRH) {
rdma_hold_gid_attr(ah_attr->grh.sgid_attr);
return ah_attr->grh.sgid_attr;
}
return NULL;
}
static struct ib_ah *_rdma_create_ah(struct ib_pd *pd,
struct rdma_ah_attr *ah_attr,
u32 flags,
struct ib_udata *udata,
struct net_device *xmit_slave)
{
struct rdma_ah_init_attr init_attr = {};
struct ib_device *device = pd->device;
struct ib_ah *ah;
int ret;
might_sleep_if(flags & RDMA_CREATE_AH_SLEEPABLE);
if (!udata && !device->ops.create_ah)
return ERR_PTR(-EOPNOTSUPP);
ah = rdma_zalloc_drv_obj_gfp(
device, ib_ah,
(flags & RDMA_CREATE_AH_SLEEPABLE) ? GFP_KERNEL : GFP_ATOMIC);
if (!ah)
return ERR_PTR(-ENOMEM);
ah->device = device;
ah->pd = pd;
ah->type = ah_attr->type;
ah->sgid_attr = rdma_update_sgid_attr(ah_attr, NULL);
init_attr.ah_attr = ah_attr;
init_attr.flags = flags;
init_attr.xmit_slave = xmit_slave;
if (udata)
ret = device->ops.create_user_ah(ah, &init_attr, udata);
else
ret = device->ops.create_ah(ah, &init_attr, NULL);
if (ret) {
if (ah->sgid_attr)
rdma_put_gid_attr(ah->sgid_attr);
kfree(ah);
return ERR_PTR(ret);
}
atomic_inc(&pd->usecnt);
return ah;
}
/**
* rdma_create_ah - Creates an address handle for the
* given address vector.
* @pd: The protection domain associated with the address handle.
* @ah_attr: The attributes of the address vector.
* @flags: Create address handle flags (see enum rdma_create_ah_flags).
*
* It returns 0 on success and returns appropriate error code on error.
* The address handle is used to reference a local or global destination
* in all UD QP post sends.
*/
struct ib_ah *rdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
u32 flags)
{
const struct ib_gid_attr *old_sgid_attr;
struct net_device *slave;
struct ib_ah *ah;
int ret;
ret = rdma_fill_sgid_attr(pd->device, ah_attr, &old_sgid_attr);
if (ret)
return ERR_PTR(ret);
slave = rdma_lag_get_ah_roce_slave(pd->device, ah_attr,
(flags & RDMA_CREATE_AH_SLEEPABLE) ?
GFP_KERNEL : GFP_ATOMIC);
if (IS_ERR(slave)) {
rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
return (void *)slave;
}
ah = _rdma_create_ah(pd, ah_attr, flags, NULL, slave);
rdma_lag_put_ah_roce_slave(slave);
rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
return ah;
}
EXPORT_SYMBOL(rdma_create_ah);
/**
* rdma_create_user_ah - Creates an address handle for the
* given address vector.
* It resolves destination mac address for ah attribute of RoCE type.
* @pd: The protection domain associated with the address handle.
* @ah_attr: The attributes of the address vector.
* @udata: pointer to user's input output buffer information need by
* provider driver.
*
* It returns 0 on success and returns appropriate error code on error.
* The address handle is used to reference a local or global destination
* in all UD QP post sends.
*/
struct ib_ah *rdma_create_user_ah(struct ib_pd *pd,
struct rdma_ah_attr *ah_attr,
struct ib_udata *udata)
{
const struct ib_gid_attr *old_sgid_attr;
struct ib_ah *ah;
int err;
err = rdma_fill_sgid_attr(pd->device, ah_attr, &old_sgid_attr);
if (err)
return ERR_PTR(err);
if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
err = ib_resolve_eth_dmac(pd->device, ah_attr);
if (err) {
ah = ERR_PTR(err);
goto out;
}
}
ah = _rdma_create_ah(pd, ah_attr, RDMA_CREATE_AH_SLEEPABLE,
udata, NULL);
out:
rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
return ah;
}
EXPORT_SYMBOL(rdma_create_user_ah);
int ib_get_rdma_header_version(const union rdma_network_hdr *hdr)
{
const struct iphdr *ip4h = (struct iphdr *)&hdr->roce4grh;
struct iphdr ip4h_checked;
const struct ipv6hdr *ip6h = (struct ipv6hdr *)&hdr->ibgrh;
/* If it's IPv6, the version must be 6, otherwise, the first
* 20 bytes (before the IPv4 header) are garbled.
*/
if (ip6h->version != 6)
return (ip4h->version == 4) ? 4 : 0;
/* version may be 6 or 4 because the first 20 bytes could be garbled */
/* RoCE v2 requires no options, thus header length
* must be 5 words
*/
if (ip4h->ihl != 5)
return 6;
/* Verify checksum.
* We can't write on scattered buffers so we need to copy to
* temp buffer.
*/
memcpy(&ip4h_checked, ip4h, sizeof(ip4h_checked));
ip4h_checked.check = 0;
ip4h_checked.check = ip_fast_csum((u8 *)&ip4h_checked, 5);
/* if IPv4 header checksum is OK, believe it */
if (ip4h->check == ip4h_checked.check)
return 4;
return 6;
}
EXPORT_SYMBOL(ib_get_rdma_header_version);
static enum rdma_network_type ib_get_net_type_by_grh(struct ib_device *device,
u32 port_num,
const struct ib_grh *grh)
{
int grh_version;
if (rdma_protocol_ib(device, port_num))
return RDMA_NETWORK_IB;
grh_version = ib_get_rdma_header_version((union rdma_network_hdr *)grh);
if (grh_version == 4)
return RDMA_NETWORK_IPV4;
if (grh->next_hdr == IPPROTO_UDP)
return RDMA_NETWORK_IPV6;
return RDMA_NETWORK_ROCE_V1;
}
struct find_gid_index_context {
u16 vlan_id;
enum ib_gid_type gid_type;
};
static bool find_gid_index(const union ib_gid *gid,
const struct ib_gid_attr *gid_attr,
void *context)
{
struct find_gid_index_context *ctx = context;
u16 vlan_id = 0xffff;
int ret;
if (ctx->gid_type != gid_attr->gid_type)
return false;
ret = rdma_read_gid_l2_fields(gid_attr, &vlan_id, NULL);
if (ret)
return false;
return ctx->vlan_id == vlan_id;
}
static const struct ib_gid_attr *
get_sgid_attr_from_eth(struct ib_device *device, u32 port_num,
u16 vlan_id, const union ib_gid *sgid,
enum ib_gid_type gid_type)
{
struct find_gid_index_context context = {.vlan_id = vlan_id,
.gid_type = gid_type};
return rdma_find_gid_by_filter(device, sgid, port_num, find_gid_index,
&context);
}
int ib_get_gids_from_rdma_hdr(const union rdma_network_hdr *hdr,
enum rdma_network_type net_type,
union ib_gid *sgid, union ib_gid *dgid)
{
struct sockaddr_in src_in;
struct sockaddr_in dst_in;
__be32 src_saddr, dst_saddr;
if (!sgid || !dgid)
return -EINVAL;
if (net_type == RDMA_NETWORK_IPV4) {
memcpy(&src_in.sin_addr.s_addr,
&hdr->roce4grh.saddr, 4);
memcpy(&dst_in.sin_addr.s_addr,
&hdr->roce4grh.daddr, 4);
src_saddr = src_in.sin_addr.s_addr;
dst_saddr = dst_in.sin_addr.s_addr;
ipv6_addr_set_v4mapped(src_saddr,
(struct in6_addr *)sgid);
ipv6_addr_set_v4mapped(dst_saddr,
(struct in6_addr *)dgid);
return 0;
} else if (net_type == RDMA_NETWORK_IPV6 ||
net_type == RDMA_NETWORK_IB || RDMA_NETWORK_ROCE_V1) {
*dgid = hdr->ibgrh.dgid;
*sgid = hdr->ibgrh.sgid;
return 0;
} else {
return -EINVAL;
}
}
EXPORT_SYMBOL(ib_get_gids_from_rdma_hdr);
/* Resolve destination mac address and hop limit for unicast destination
* GID entry, considering the source GID entry as well.
* ah_attribute must have have valid port_num, sgid_index.
*/
static int ib_resolve_unicast_gid_dmac(struct ib_device *device,
struct rdma_ah_attr *ah_attr)
{
struct ib_global_route *grh = rdma_ah_retrieve_grh(ah_attr);
const struct ib_gid_attr *sgid_attr = grh->sgid_attr;
int hop_limit = 0xff;
int ret = 0;
/* If destination is link local and source GID is RoCEv1,
* IP stack is not used.
*/
if (rdma_link_local_addr((struct in6_addr *)grh->dgid.raw) &&
sgid_attr->gid_type == IB_GID_TYPE_ROCE) {
rdma_get_ll_mac((struct in6_addr *)grh->dgid.raw,
ah_attr->roce.dmac);
return ret;
}
ret = rdma_addr_find_l2_eth_by_grh(&sgid_attr->gid, &grh->dgid,
ah_attr->roce.dmac,
sgid_attr, &hop_limit);
grh->hop_limit = hop_limit;
return ret;
}
/*
* This function initializes address handle attributes from the incoming packet.
* Incoming packet has dgid of the receiver node on which this code is
* getting executed and, sgid contains the GID of the sender.
*
* When resolving mac address of destination, the arrived dgid is used
* as sgid and, sgid is used as dgid because sgid contains destinations
* GID whom to respond to.
*
* On success the caller is responsible to call rdma_destroy_ah_attr on the
* attr.
*/
int ib_init_ah_attr_from_wc(struct ib_device *device, u32 port_num,
const struct ib_wc *wc, const struct ib_grh *grh,
struct rdma_ah_attr *ah_attr)
{
u32 flow_class;
int ret;
enum rdma_network_type net_type = RDMA_NETWORK_IB;
enum ib_gid_type gid_type = IB_GID_TYPE_IB;
const struct ib_gid_attr *sgid_attr;
int hoplimit = 0xff;
union ib_gid dgid;
union ib_gid sgid;
might_sleep();
memset(ah_attr, 0, sizeof *ah_attr);
ah_attr->type = rdma_ah_find_type(device, port_num);
if (rdma_cap_eth_ah(device, port_num)) {
if (wc->wc_flags & IB_WC_WITH_NETWORK_HDR_TYPE)
net_type = wc->network_hdr_type;
else
net_type = ib_get_net_type_by_grh(device, port_num, grh);
gid_type = ib_network_to_gid_type(net_type);
}
ret = ib_get_gids_from_rdma_hdr((union rdma_network_hdr *)grh, net_type,
&sgid, &dgid);
if (ret)
return ret;
rdma_ah_set_sl(ah_attr, wc->sl);
rdma_ah_set_port_num(ah_attr, port_num);
if (rdma_protocol_roce(device, port_num)) {
u16 vlan_id = wc->wc_flags & IB_WC_WITH_VLAN ?
wc->vlan_id : 0xffff;
if (!(wc->wc_flags & IB_WC_GRH))
return -EPROTOTYPE;
sgid_attr = get_sgid_attr_from_eth(device, port_num,
vlan_id, &dgid,
gid_type);
if (IS_ERR(sgid_attr))
return PTR_ERR(sgid_attr);
flow_class = be32_to_cpu(grh->version_tclass_flow);
rdma_move_grh_sgid_attr(ah_attr,
&sgid,
flow_class & 0xFFFFF,
hoplimit,
(flow_class >> 20) & 0xFF,
sgid_attr);
ret = ib_resolve_unicast_gid_dmac(device, ah_attr);
if (ret)
rdma_destroy_ah_attr(ah_attr);
return ret;
} else {
rdma_ah_set_dlid(ah_attr, wc->slid);
rdma_ah_set_path_bits(ah_attr, wc->dlid_path_bits);
if ((wc->wc_flags & IB_WC_GRH) == 0)
return 0;
if (dgid.global.interface_id !=
cpu_to_be64(IB_SA_WELL_KNOWN_GUID)) {
sgid_attr = rdma_find_gid_by_port(
device, &dgid, IB_GID_TYPE_IB, port_num, NULL);
} else
sgid_attr = rdma_get_gid_attr(device, port_num, 0);
if (IS_ERR(sgid_attr))
return PTR_ERR(sgid_attr);
flow_class = be32_to_cpu(grh->version_tclass_flow);
rdma_move_grh_sgid_attr(ah_attr,
&sgid,
flow_class & 0xFFFFF,
hoplimit,
(flow_class >> 20) & 0xFF,
sgid_attr);
return 0;
}
}
EXPORT_SYMBOL(ib_init_ah_attr_from_wc);
/**
* rdma_move_grh_sgid_attr - Sets the sgid attribute of GRH, taking ownership
* of the reference
*
* @attr: Pointer to AH attribute structure
* @dgid: Destination GID
* @flow_label: Flow label
* @hop_limit: Hop limit
* @traffic_class: traffic class
* @sgid_attr: Pointer to SGID attribute
*
* This takes ownership of the sgid_attr reference. The caller must ensure
* rdma_destroy_ah_attr() is called before destroying the rdma_ah_attr after
* calling this function.
*/
void rdma_move_grh_sgid_attr(struct rdma_ah_attr *attr, union ib_gid *dgid,
u32 flow_label, u8 hop_limit, u8 traffic_class,
const struct ib_gid_attr *sgid_attr)
{
rdma_ah_set_grh(attr, dgid, flow_label, sgid_attr->index, hop_limit,
traffic_class);
attr->grh.sgid_attr = sgid_attr;
}
EXPORT_SYMBOL(rdma_move_grh_sgid_attr);
/**
* rdma_destroy_ah_attr - Release reference to SGID attribute of
* ah attribute.
* @ah_attr: Pointer to ah attribute
*
* Release reference to the SGID attribute of the ah attribute if it is
* non NULL. It is safe to call this multiple times, and safe to call it on
* a zero initialized ah_attr.
*/
void rdma_destroy_ah_attr(struct rdma_ah_attr *ah_attr)
{
if (ah_attr->grh.sgid_attr) {
rdma_put_gid_attr(ah_attr->grh.sgid_attr);
ah_attr->grh.sgid_attr = NULL;
}
}
EXPORT_SYMBOL(rdma_destroy_ah_attr);
struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc,
const struct ib_grh *grh, u32 port_num)
{
struct rdma_ah_attr ah_attr;
struct ib_ah *ah;
int ret;
ret = ib_init_ah_attr_from_wc(pd->device, port_num, wc, grh, &ah_attr);
if (ret)
return ERR_PTR(ret);
ah = rdma_create_ah(pd, &ah_attr, RDMA_CREATE_AH_SLEEPABLE);
rdma_destroy_ah_attr(&ah_attr);
return ah;
}
EXPORT_SYMBOL(ib_create_ah_from_wc);
int rdma_modify_ah(struct ib_ah *ah, struct rdma_ah_attr *ah_attr)
{
const struct ib_gid_attr *old_sgid_attr;
int ret;
if (ah->type != ah_attr->type)
return -EINVAL;
ret = rdma_fill_sgid_attr(ah->device, ah_attr, &old_sgid_attr);
if (ret)
return ret;
ret = ah->device->ops.modify_ah ?
ah->device->ops.modify_ah(ah, ah_attr) :
-EOPNOTSUPP;
ah->sgid_attr = rdma_update_sgid_attr(ah_attr, ah->sgid_attr);
rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
return ret;
}
EXPORT_SYMBOL(rdma_modify_ah);
int rdma_query_ah(struct ib_ah *ah, struct rdma_ah_attr *ah_attr)
{
ah_attr->grh.sgid_attr = NULL;
return ah->device->ops.query_ah ?
ah->device->ops.query_ah(ah, ah_attr) :
-EOPNOTSUPP;
}
EXPORT_SYMBOL(rdma_query_ah);
int rdma_destroy_ah_user(struct ib_ah *ah, u32 flags, struct ib_udata *udata)
{
const struct ib_gid_attr *sgid_attr = ah->sgid_attr;
struct ib_pd *pd;
int ret;
might_sleep_if(flags & RDMA_DESTROY_AH_SLEEPABLE);
pd = ah->pd;
ret = ah->device->ops.destroy_ah(ah, flags);
if (ret)
return ret;
atomic_dec(&pd->usecnt);
if (sgid_attr)
rdma_put_gid_attr(sgid_attr);
kfree(ah);
return ret;
}
EXPORT_SYMBOL(rdma_destroy_ah_user);
/* Shared receive queues */
/**
* ib_create_srq_user - Creates a SRQ associated with the specified protection
* domain.
* @pd: The protection domain associated with the SRQ.
* @srq_init_attr: A list of initial attributes required to create the
* SRQ. If SRQ creation succeeds, then the attributes are updated to
* the actual capabilities of the created SRQ.
* @uobject: uobject pointer if this is not a kernel SRQ
* @udata: udata pointer if this is not a kernel SRQ