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IB/core: Introduce and use rdma_create_user_ah 

Introduce rdma_create_user_ah API which allows passing udata to
provider driver and additionally which resolves DMAC for RoCE.

ib_resolve_eth_dmac() resolves destination mac address for unicast,
multicast, link local ipv4 mapped ipv6 and ipv6 destination gid entry.
This allows all RoCE provider drivers to avoid duplicating such code.

Such change brings consistency where IB core always resolves dmac and pass
it to RoCE provider drivers for user and kernel consumers, with this
ah_attr->roce.dmac is always an input field for provider drivers.

This uniformity avoids exporting ib_resolve_eth_dmac symbol to providers
or other modules. Therefore its removed as exported symbol at later in
the patch series.

Now uverbs and umad both makes use of rdma_create_user_ah API which
fixes the issue where umad has invalid DMAC for address.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Parav Pandit 2017-10-16 08:45:12 +03:00 committed by Doug Ledford
parent 2652c79252
commit 5cda6587fe
4 changed files with 55 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/infiniband/core/user_mad.c
View File

@ -506,7 +506,7 @@ static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
}
ah = rdma_create_ah(agent->qp->pd, &ah_attr);
ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
if (IS_ERR(ah)) {
ret = PTR_ERR(ah);
goto err_up;

10
drivers/infiniband/core/uverbs_cmd.c
View File

@ -2537,7 +2537,6 @@ ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
struct rdma_ah_attr attr;
int ret;
struct ib_udata udata;
u8 *dmac;
if (out_len < sizeof resp)
return -ENOSPC;
@ -2580,20 +2579,13 @@ ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
} else {
rdma_ah_set_ah_flags(&attr, 0);
}
dmac = rdma_ah_retrieve_dmac(&attr);
if (dmac)
memset(dmac, 0, ETH_ALEN);
ah = pd->device->create_ah(pd, &attr, &udata);
ah = rdma_create_user_ah(pd, &attr, &udata);
if (IS_ERR(ah)) {
ret = PTR_ERR(ah);
goto err_put;
}
ah->device = pd->device;
ah->pd = pd;
atomic_inc(&pd->usecnt);
ah->uobject = uobj;
uobj->user_handle = cmd.user_handle;
uobj->object = ah;

40
drivers/infiniband/core/verbs.c
View File

@ -302,11 +302,13 @@ EXPORT_SYMBOL(ib_dealloc_pd);
/* Address handles */
struct ib_ah *rdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr)
static struct ib_ah *_rdma_create_ah(struct ib_pd *pd,
struct rdma_ah_attr *ah_attr,
struct ib_udata *udata)
{
struct ib_ah *ah;
ah = pd->device->create_ah(pd, ah_attr, NULL);
ah = pd->device->create_ah(pd, ah_attr, udata);
if (!IS_ERR(ah)) {
ah->device = pd->device;
@ -318,8 +320,42 @@ struct ib_ah *rdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr)
return ah;
}
struct ib_ah *rdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr)
{
return _rdma_create_ah(pd, ah_attr, NULL);
}
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)
{
int err;
if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
err = ib_resolve_eth_dmac(pd->device, ah_attr);
if (err)
return ERR_PTR(err);
}
return _rdma_create_ah(pd, ah_attr, udata);
}
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;

15
include/rdma/ib_verbs.h
View File

@ -2857,6 +2857,21 @@ void ib_dealloc_pd(struct ib_pd *pd);
*/
struct ib_ah *rdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr);
/**
* 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);
/**
* ib_get_gids_from_rdma_hdr - Get sgid and dgid from GRH or IPv4 header
* work completion.