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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>
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@ -158,9 +158,19 @@ static int rxe_create_ah(struct ib_ah *ibah,
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struct ib_udata *udata)
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{
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int err;
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struct rxe_dev *rxe = to_rdev(ibah->device);
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struct rxe_ah *ah = to_rah(ibah);
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struct rxe_create_ah_resp __user *uresp = NULL;
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int err;
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if (udata) {
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/* test if new user provider */
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if (udata->outlen >= sizeof(*uresp))
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uresp = udata->outbuf;
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ah->is_user = true;
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} else {
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ah->is_user = false;
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}
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err = rxe_av_chk_attr(rxe, init_attr->ah_attr);
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if (err)
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@ -170,6 +180,24 @@ static int rxe_create_ah(struct ib_ah *ibah,
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if (err)
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return err;
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/* create index > 0 */
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rxe_add_index(ah);
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ah->ah_num = ah->pelem.index;
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if (uresp) {
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/* only if new user provider */
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err = copy_to_user(&uresp->ah_num, &ah->ah_num,
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sizeof(uresp->ah_num));
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if (err) {
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rxe_drop_index(ah);
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rxe_drop_ref(ah);
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return -EFAULT;
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}
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} else if (ah->is_user) {
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/* only if old user provider */
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ah->ah_num = 0;
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}
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rxe_init_av(init_attr->ah_attr, &ah->av);
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return 0;
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}
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@ -202,6 +230,7 @@ static int rxe_destroy_ah(struct ib_ah *ibah, u32 flags)
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{
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struct rxe_ah *ah = to_rah(ibah);
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rxe_drop_index(ah);
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rxe_drop_ref(ah);
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return 0;
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}
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@ -48,6 +48,8 @@ struct rxe_ah {
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struct rxe_pool_entry pelem;
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struct rxe_pd *pd;
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struct rxe_av av;
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bool is_user;
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int ah_num;
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};
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struct rxe_cqe {
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@ -99,7 +99,8 @@ struct rxe_send_wr {
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__u32 remote_qkey;
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__u16 pkey_index;
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__u16 reserved;
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__u32 pad[5];
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__u32 ah_num;
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__u32 pad[4];
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struct rxe_av av;
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} ud;
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struct {
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@ -170,6 +171,11 @@ struct rxe_recv_wqe {
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struct rxe_dma_info dma;
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};
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struct rxe_create_ah_resp {
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__u32 ah_num;
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__u32 reserved;
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};
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struct rxe_create_cq_resp {
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struct mminfo mi;
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};
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