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RDMA/ucma: Support querying for AF_IB addresses 

The sockaddr structure for AF_IB is larger than sockaddr_in6.  The
rdma cm user space ABI uses the latter to exchange address information
between user space and the kernel.

To support querying for larger addresses, define a new query command
that exchanges data using sockaddr_storage, rather than sockaddr_in6.
Unlike the existing query_route command, the new command only returns
address information.  Route (i.e. path record) data is separated.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Sean Hefty 2013-05-29 10:09:25 -07:00 committed by Roland Dreier
parent 94d0c93941
commit ee7aed4528
2 changed files with 93 additions and 5 deletions
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76
drivers/infiniband/core/ucma.c
View File

@ -47,6 +47,7 @@
#include <rdma/ib_marshall.h>
#include <rdma/rdma_cm.h>
#include <rdma/rdma_cm_ib.h>
#include <rdma/ib_addr.h>
MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
@ -649,7 +650,7 @@ static ssize_t ucma_query_route(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_query_route cmd;
struct rdma_ucm_query cmd;
struct rdma_ucm_query_route_resp resp;
struct ucma_context *ctx;
struct sockaddr *addr;
@ -709,6 +710,76 @@ static ssize_t ucma_query_route(struct ucma_file *file,
return ret;
}
static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
struct rdma_ucm_query_addr_resp *resp)
{
if (!cm_id->device)
return;
resp->node_guid = (__force __u64) cm_id->device->node_guid;
resp->port_num = cm_id->port_num;
resp->pkey = (__force __u16) cpu_to_be16(
ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
}
static ssize_t ucma_query_addr(struct ucma_context *ctx,
void __user *response, int out_len)
{
struct rdma_ucm_query_addr_resp resp;
struct sockaddr *addr;
int ret = 0;
if (out_len < sizeof(resp))
return -ENOSPC;
memset(&resp, 0, sizeof resp);
addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
resp.src_size = rdma_addr_size(addr);
memcpy(&resp.src_addr, addr, resp.src_size);
addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
resp.dst_size = rdma_addr_size(addr);
memcpy(&resp.dst_addr, addr, resp.dst_size);
ucma_query_device_addr(ctx->cm_id, &resp);
if (copy_to_user(response, &resp, sizeof(resp)))
ret = -EFAULT;
return ret;
}
static ssize_t ucma_query(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_query cmd;
struct ucma_context *ctx;
void __user *response;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
response = (void __user *)(unsigned long) cmd.response;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
switch (cmd.option) {
case RDMA_USER_CM_QUERY_ADDR:
ret = ucma_query_addr(ctx, response, out_len);
break;
default:
ret = -ENOSYS;
break;
}
ucma_put_ctx(ctx);
return ret;
}
static void ucma_copy_conn_param(struct rdma_cm_id *id,
struct rdma_conn_param *dst,
struct rdma_ucm_conn_param *src)
@ -1241,7 +1312,8 @@ static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
[RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
[RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
[RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
[RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
[RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
[RDMA_USER_CM_CMD_QUERY] = ucma_query
};
static ssize_t ucma_write(struct file *filp, const char __user *buf,

22
include/uapi/rdma/rdma_user_cm.h
View File

@ -61,7 +61,8 @@ enum {
RDMA_USER_CM_CMD_NOTIFY,
RDMA_USER_CM_CMD_JOIN_MCAST,
RDMA_USER_CM_CMD_LEAVE_MCAST,
RDMA_USER_CM_CMD_MIGRATE_ID
RDMA_USER_CM_CMD_MIGRATE_ID,
RDMA_USER_CM_CMD_QUERY
};
/*
@ -113,10 +114,14 @@ struct rdma_ucm_resolve_route {
__u32 timeout_ms;
};
struct rdma_ucm_query_route {
enum {
RDMA_USER_CM_QUERY_ADDR
};
struct rdma_ucm_query {
__u64 response;
__u32 id;
__u32 reserved;
__u32 option;
};
struct rdma_ucm_query_route_resp {
@ -129,6 +134,17 @@ struct rdma_ucm_query_route_resp {
__u8 reserved[3];
};
struct rdma_ucm_query_addr_resp {
__u64 node_guid;
__u8 port_num;
__u8 reserved;
__u16 pkey;
__u16 src_size;
__u16 dst_size;
struct sockaddr_storage src_addr;
struct sockaddr_storage dst_addr;
};
struct rdma_ucm_conn_param {
__u32 qp_num;
__u32 qkey;