+ if (max_enq <= sizeof (session_dgram_hdr_t))
+ return 0;
+ return max_enq - sizeof (session_dgram_hdr_t);
+ }
+
+ return svm_fifo_max_enqueue_prod (s->tx_fifo);
+ }
+ else if (s->session_state == VCL_STATE_LISTEN)
+ {
+ if (s->tx_fifo)
+ return svm_fifo_max_enqueue_prod (s->tx_fifo);
+ else
+ return VPPCOM_EBADFD;
+ }
+ else
+ {
+ return (s->session_state == VCL_STATE_DISCONNECT) ?
+ VPPCOM_ECONNRESET : VPPCOM_ENOTCONN;
+ }
+}
+
+int
+vcl_segment_attach (u64 segment_handle, char *name, ssvm_segment_type_t type,
+ int fd)
+{
+ fifo_segment_create_args_t _a, *a = &_a;
+ int rv;
+
+ memset (a, 0, sizeof (*a));
+ a->segment_name = name;
+ a->segment_type = type;
+
+ if (type == SSVM_SEGMENT_MEMFD)
+ a->memfd_fd = fd;
+
+ clib_rwlock_writer_lock (&vcm->segment_table_lock);
+
+ if ((rv = fifo_segment_attach (&vcm->segment_main, a)))
+ {
+ clib_warning ("svm_fifo_segment_attach ('%s') failed", name);
+ return rv;
+ }
+ hash_set (vcm->segment_table, segment_handle, a->new_segment_indices[0]);
+
+ clib_rwlock_writer_unlock (&vcm->segment_table_lock);
+
+ vec_reset_length (a->new_segment_indices);
+ return 0;
+}
+
+u32
+vcl_segment_table_lookup (u64 segment_handle)
+{
+ uword *seg_indexp;
+
+ clib_rwlock_reader_lock (&vcm->segment_table_lock);
+ seg_indexp = hash_get (vcm->segment_table, segment_handle);
+ clib_rwlock_reader_unlock (&vcm->segment_table_lock);
+
+ if (!seg_indexp)
+ return VCL_INVALID_SEGMENT_INDEX;
+ return ((u32) * seg_indexp);
+}
+
+void
+vcl_segment_detach (u64 segment_handle)
+{
+ fifo_segment_main_t *sm = &vcm->segment_main;
+ fifo_segment_t *segment;
+ u32 segment_index;
+
+ segment_index = vcl_segment_table_lookup (segment_handle);
+ if (segment_index == (u32) ~ 0)
+ return;
+
+ clib_rwlock_writer_lock (&vcm->segment_table_lock);
+
+ segment = fifo_segment_get_segment (sm, segment_index);
+ fifo_segment_delete (sm, segment);
+ hash_unset (vcm->segment_table, segment_handle);
+
+ clib_rwlock_writer_unlock (&vcm->segment_table_lock);
+
+ VDBG (0, "detached segment %u handle %u", segment_index, segment_handle);
+}
+
+int
+vcl_segment_attach_session (uword segment_handle, uword rxf_offset,
+ uword txf_offset, uword mq_offset, u8 is_ct,
+ vcl_session_t *s)
+{
+ svm_fifo_shared_t *rxsf, *txsf;
+ u32 fs_index, eqs_index;
+ svm_fifo_t *rxf, *txf;
+ fifo_segment_t *fs;
+ u64 eqs_handle;
+
+ fs_index = vcl_segment_table_lookup (segment_handle);
+ if (fs_index == VCL_INVALID_SEGMENT_INDEX)
+ {
+ VDBG (0, "ERROR: segment for session %u is not mounted!",
+ s->session_index);
+ return -1;
+ }
+
+ if (mq_offset != (uword) ~0)
+ {
+ eqs_handle = vcl_vpp_worker_segment_handle (0);
+ eqs_index = vcl_segment_table_lookup (eqs_handle);
+ ASSERT (eqs_index != VCL_INVALID_SEGMENT_INDEX);
+ }
+
+ rxsf = uword_to_pointer (rxf_offset, svm_fifo_shared_t *);
+ txsf = uword_to_pointer (txf_offset, svm_fifo_shared_t *);
+
+ clib_rwlock_reader_lock (&vcm->segment_table_lock);
+
+ fs = fifo_segment_get_segment (&vcm->segment_main, fs_index);
+ rxf = fifo_segment_alloc_fifo_w_shared (fs, rxsf);
+ txf = fifo_segment_alloc_fifo_w_shared (fs, txsf);
+
+ if (!is_ct && mq_offset != (uword) ~0)
+ {
+ fs = fifo_segment_get_segment (&vcm->segment_main, eqs_index);
+ s->vpp_evt_q =
+ fifo_segment_msg_q_attach (fs, mq_offset, rxf->shr->slice_index);
+ }
+
+ clib_rwlock_reader_unlock (&vcm->segment_table_lock);
+
+ if (!is_ct)
+ {
+ rxsf->client_session_index = s->session_index;
+ txsf->client_session_index = s->session_index;
+ rxf->client_thread_index = vcl_get_worker_index ();
+ txf->client_thread_index = vcl_get_worker_index ();
+ s->rx_fifo = rxf;
+ s->tx_fifo = txf;
+ }
+ else
+ {
+ s->ct_rx_fifo = rxf;
+ s->ct_tx_fifo = txf;
+ }
+
+ return 0;
+}
+
+int
+vcl_segment_attach_mq (uword segment_handle, uword mq_offset, u32 mq_index,
+ svm_msg_q_t **mq)
+{
+ fifo_segment_t *fs;
+ u32 fs_index;
+
+ fs_index = vcl_segment_table_lookup (segment_handle);
+ if (fs_index == VCL_INVALID_SEGMENT_INDEX)
+ {
+ VDBG (0, "ERROR: mq segment %lx for is not attached!", segment_handle);
+ return -1;
+ }
+
+ clib_rwlock_reader_lock (&vcm->segment_table_lock);
+
+ fs = fifo_segment_get_segment (&vcm->segment_main, fs_index);
+ *mq = fifo_segment_msg_q_attach (fs, mq_offset, mq_index);
+
+ clib_rwlock_reader_unlock (&vcm->segment_table_lock);
+
+ return 0;