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authorBob Pearson <rpearsonhpe@gmail.com>2021-10-07 15:40:49 -0500
committerJason Gunthorpe <jgg@nvidia.com>2021-10-12 13:25:26 -0300
commit73a54932100375ba94b31710f1e3f1234f23be0b (patch)
treecd0be4cfd74d32397a36452aa0070a56e4949996 /drivers/infiniband/sw/rxe/rxe_verbs.c
parentRDMA/rxe: Change AH objects to indexed (diff)
downloadlinux-dev-73a54932100375ba94b31710f1e3f1234f23be0b.tar.xz
linux-dev-73a54932100375ba94b31710f1e3f1234f23be0b.zip
RDMA/rxe: Create AH index and return to user space
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>
Diffstat (limited to 'drivers/infiniband/sw/rxe/rxe_verbs.c')
-rw-r--r--drivers/infiniband/sw/rxe/rxe_verbs.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index 4233fd9edfd1..e20f2dd20639 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -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;
}