From patchwork Thu Sep 28 13:20:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 1840827 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=X+5HuliA; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RxDlV1B1zz1ypN for ; Thu, 28 Sep 2023 23:26:30 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qlqwx-0003oA-W3; Thu, 28 Sep 2023 09:21:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qlqwd-0003bi-9H for qemu-devel@nongnu.org; Thu, 28 Sep 2023 09:20:43 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qlqwP-0008HW-N0 for qemu-devel@nongnu.org; Thu, 28 Sep 2023 09:20:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1695907229; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MvoAxvYZaqo7bzchnP58oSUeeoRm4YLTIfoBKaMl0mM=; b=X+5HuliACwtm9kPvhW3rDEx3wbOWaxQPeiSka2OEJVBNtzBUtdf+oEend+yA0ONamyF8E9 MSs/SnTeBFbiFn/ed0eYrPnkhW02OVSo21UMoMFRLlYeMfSyrEeDKWtOvmfwj7L2QuLRMB ffRMp5y6ZzNXYgP4K9J2TCzsJ5VprO4= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-108-mVq5IydKNmyJdQxRrsr_Tg-1; Thu, 28 Sep 2023 09:20:24 -0400 X-MC-Unique: mVq5IydKNmyJdQxRrsr_Tg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 5C2CF280A9CD; Thu, 28 Sep 2023 13:20:24 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.192.25]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1D24F40C6E76; Thu, 28 Sep 2023 13:20:24 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 4153621E689C; Thu, 28 Sep 2023 15:20:20 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Cc: quintela@redhat.com, peterx@redhat.com, leobras@redhat.com, farosas@suse.de, lizhijian@fujitsu.com, eblake@redhat.com Subject: [PATCH v2 40/53] migration/rdma: Convert qemu_rdma_write_one() to Error Date: Thu, 28 Sep 2023 15:20:06 +0200 Message-ID: <20230928132019.2544702-41-armbru@redhat.com> In-Reply-To: <20230928132019.2544702-1-armbru@redhat.com> References: <20230928132019.2544702-1-armbru@redhat.com> MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Functions that use an Error **errp parameter to return errors should not also report them to the user, because reporting is the caller's job. When the caller does, the error is reported twice. When it doesn't (because it recovered from the error), there is no error to report, i.e. the report is bogus. qemu_rdma_write_flush() violates this principle: it calls error_report() via qemu_rdma_write_one(). I elected not to investigate how callers handle the error, i.e. precise impact is not known. Clean this up by converting qemu_rdma_write_one() to Error. Bonus: resolves a FIXME about problematic use of errno. Signed-off-by: Markus Armbruster Reviewed-by: Li Zhijian Reviewed-by: Juan Quintela --- migration/rdma.c | 31 ++++++++++++------------------- 1 file changed, 12 insertions(+), 19 deletions(-) diff --git a/migration/rdma.c b/migration/rdma.c index feed8712bb..928d09d177 100644 --- a/migration/rdma.c +++ b/migration/rdma.c @@ -2040,9 +2040,8 @@ static int qemu_rdma_exchange_recv(RDMAContext *rdma, RDMAControlHeader *head, */ static int qemu_rdma_write_one(QEMUFile *f, RDMAContext *rdma, int current_index, uint64_t current_addr, - uint64_t length) + uint64_t length, Error **errp) { - Error *err = NULL; struct ibv_sge sge; struct ibv_send_wr send_wr = { 0 }; struct ibv_send_wr *bad_wr; @@ -2096,7 +2095,7 @@ retry: ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); if (ret < 0) { - error_report("Failed to Wait for previous write to complete " + error_setg(errp, "Failed to Wait for previous write to complete " "block %d chunk %" PRIu64 " current %" PRIu64 " len %" PRIu64 " %d", current_index, chunk, sge.addr, length, rdma->nb_sent); @@ -2128,10 +2127,9 @@ retry: compress_to_network(rdma, &comp); ret = qemu_rdma_exchange_send(rdma, &head, - (uint8_t *) &comp, NULL, NULL, NULL, &err); + (uint8_t *) &comp, NULL, NULL, NULL, errp); if (ret < 0) { - error_report_err(err); return -1; } @@ -2157,9 +2155,8 @@ retry: register_to_network(rdma, ®); ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, - &resp, ®_result_idx, NULL, &err); + &resp, ®_result_idx, NULL, errp); if (ret < 0) { - error_report_err(err); return -1; } @@ -2167,7 +2164,7 @@ retry: if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, &sge.lkey, NULL, chunk, chunk_start, chunk_end)) { - error_report("cannot get lkey"); + error_setg(errp, "cannot get lkey"); return -1; } @@ -2186,7 +2183,7 @@ retry: if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, &sge.lkey, NULL, chunk, chunk_start, chunk_end)) { - error_report("cannot get lkey!"); + error_setg(errp, "cannot get lkey!"); return -1; } } @@ -2198,7 +2195,7 @@ retry: if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, &sge.lkey, NULL, chunk, chunk_start, chunk_end)) { - error_report("cannot get lkey!"); + error_setg(errp, "cannot get lkey!"); return -1; } } @@ -2232,7 +2229,7 @@ retry: trace_qemu_rdma_write_one_queue_full(); ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); if (ret < 0) { - error_report("rdma migration: failed to make " + error_setg(errp, "rdma migration: failed to make " "room in full send queue!"); return -1; } @@ -2240,12 +2237,8 @@ retry: goto retry; } else if (ret > 0) { - /* - * FIXME perror() is problematic, because whether - * ibv_post_send() sets errno is unclear. Will go away later - * in this series. - */ - perror("rdma migration: post rdma write failed"); + error_setg_errno(errp, ret, + "rdma migration: post rdma write failed"); return -1; } @@ -2274,10 +2267,10 @@ static int qemu_rdma_write_flush(QEMUFile *f, RDMAContext *rdma, } ret = qemu_rdma_write_one(f, rdma, - rdma->current_index, rdma->current_addr, rdma->current_length); + rdma->current_index, rdma->current_addr, rdma->current_length, + errp); if (ret < 0) { - error_setg(errp, "FIXME temporary error message"); return -1; }