prov/tcp: don't use uring multishot

multishot is not supported on older kernels (prior to 5.19) and is
unreliable in early 6.x kernels.

For now, use single-shot and re-submit

prov/tcp/src/xnet_pep.c

@@ -253,7 +253,7 @@ int xnet_listen(struct xnet_pep *pep, struct xnet_progress *progress)
 
 	ofi_genlock_lock(&progress->ep_lock);
 	if (xnet_io_uring) {
-		ret = xnet_uring_pollin_add(progress, pep->sock, true,
+		ret = xnet_uring_pollin_add(progress, pep->sock, false,
 					    &pep->pollin_sockctx);
 	} else {
 		ret = xnet_monitor_sock(progress, pep->sock, POLLIN,

prov/tcp/src/xnet_progress.c

@@ -1329,6 +1329,7 @@ static void xnet_progress_cqe(struct xnet_progress *progress,
 	struct xnet_ep *ep;
 	struct xnet_conn_handle *conn;
 	struct xnet_pep *pep;
+	int ret;
 
 	assert(xnet_io_uring);
 	sockctx = (struct ofi_sockctx *) cqe->user_data;
@@ -1351,8 +1352,16 @@ static void xnet_progress_cqe(struct xnet_progress *progress,
 	case FI_CLASS_PEP:
 		pep = container_of(fid, struct xnet_pep, util_pep.pep_fid.fid);
 		if (sockctx == &pep->pollin_sockctx) {
-			if (cqe->res >= 0)
+			if (cqe->res >= 0) {
 				xnet_accept_sock(pep);
+				ret = xnet_uring_pollin_add(pep->progress, pep->sock,
+							false, &pep->pollin_sockctx);
+				if (ret) {
+					FI_WARN(&xnet_prov, FI_LOG_EP_CTRL,
+						"pollin add failed (%d)\n", ret);
+					fi_close(&pep->util_pep.pep_fid.fid);
+				}
+			}
 		}
 		/* Must be a cancelation otherwise */
 		break;