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RDMA/rxe: Create AH index and return to user space

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Make changes to rdma_user_rxe.h to allow indexing AH objects, passing the
index in UD send WRs to the driver and returning the index to the rxe
provider.

Modify rxe_create_ah() to add an index to AH when created and if called
from a new user provider return it to user space. If called from an old
provider mark the AH as not having a useful index.  Modify rxe_destroy_ah
to drop the index before deleting the object.

Link: https://lore.kernel.org/r/20211007204051.10086-4-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Bob Pearson 2021-10-07 15:40:49 -05:00 committed by Jason Gunthorpe
parent 99c13a3e29
commit 73a5493210
3 changed files with 39 additions and 2 deletions
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31
drivers/infiniband/sw/rxe/rxe_verbs.c
View file

@ -158,9 +158,19 @@ static int rxe_create_ah(struct ib_ah *ibah,
struct ib_udata *udata)
{
int err;
struct rxe_dev *rxe = to_rdev(ibah->device);
struct rxe_ah *ah = to_rah(ibah);
struct rxe_create_ah_resp __user *uresp = NULL;
int err;
if (udata) {
/* test if new user provider */
if (udata->outlen >= sizeof(*uresp))
uresp = udata->outbuf;
ah->is_user = true;
} else {
ah->is_user = false;
}
err = rxe_av_chk_attr(rxe, init_attr->ah_attr);
if (err)
@ -170,6 +180,24 @@ static int rxe_create_ah(struct ib_ah *ibah,
if (err)
return err;
/* create index > 0 */
rxe_add_index(ah);
ah->ah_num = ah->pelem.index;
if (uresp) {
/* only if new user provider */
err = copy_to_user(&uresp->ah_num, &ah->ah_num,
sizeof(uresp->ah_num));
if (err) {
rxe_drop_index(ah);
rxe_drop_ref(ah);
return -EFAULT;
}
} else if (ah->is_user) {
/* only if old user provider */
ah->ah_num = 0;
}
rxe_init_av(init_attr->ah_attr, &ah->av);
return 0;
}
@ -202,6 +230,7 @@ static int rxe_destroy_ah(struct ib_ah *ibah, u32 flags)
{
struct rxe_ah *ah = to_rah(ibah);
rxe_drop_index(ah);
rxe_drop_ref(ah);
return 0;
}

2
drivers/infiniband/sw/rxe/rxe_verbs.h
View file

@ -48,6 +48,8 @@ struct rxe_ah {
struct rxe_pool_entry pelem;
struct rxe_pd *pd;
struct rxe_av av;
bool is_user;
int ah_num;
};
struct rxe_cqe {

8
include/uapi/rdma/rdma_user_rxe.h
View file

@ -99,7 +99,8 @@ struct rxe_send_wr {
__u32 remote_qkey;
__u16 pkey_index;
__u16 reserved;
__u32 pad[5];
__u32 ah_num;
__u32 pad[4];
struct rxe_av av;
} ud;
struct {
@ -170,6 +171,11 @@ struct rxe_recv_wqe {
struct rxe_dma_info dma;
};
struct rxe_create_ah_resp {
__u32 ah_num;
__u32 reserved;
};
struct rxe_create_cq_resp {
struct mminfo mi;
};