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GET /api/patches/817375/?format=api
{ "id": 817375, "url": "http://patchwork.ozlabs.org/api/patches/817375/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/patch/1506067355-5771-4-git-send-email-jasowang@redhat.com/", "project": { "id": 7, "url": "http://patchwork.ozlabs.org/api/projects/7/?format=api", "name": "Linux network development", "link_name": "netdev", "list_id": "netdev.vger.kernel.org", "list_email": "netdev@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<1506067355-5771-4-git-send-email-jasowang@redhat.com>", "list_archive_url": null, "date": "2017-09-22T08:02:33", "name": "[net-next,RFC,3/5] vhost: introduce vhost_add_used_idx()", "commit_ref": null, "pull_url": null, "state": "rfc", "archived": true, "hash": "63f5a299fdf2515d0ff4fe01e21a8745c0f21ae6", "submitter": { "id": 5225, "url": "http://patchwork.ozlabs.org/api/people/5225/?format=api", "name": "Jason Wang", "email": "jasowang@redhat.com" }, "delegate": { "id": 34, "url": "http://patchwork.ozlabs.org/api/users/34/?format=api", "username": "davem", "first_name": "David", "last_name": "Miller", "email": "davem@davemloft.net" }, "mbox": "http://patchwork.ozlabs.org/project/netdev/patch/1506067355-5771-4-git-send-email-jasowang@redhat.com/mbox/", "series": [ { "id": 4565, "url": "http://patchwork.ozlabs.org/api/series/4565/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/list/?series=4565", "date": "2017-09-22T08:02:35", "name": "batched tx processing in vhost_net", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/4565/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/817375/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/817375/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<netdev-owner@vger.kernel.org>", "X-Original-To": "patchwork-incoming@ozlabs.org", "Delivered-To": "patchwork-incoming@ozlabs.org", "Authentication-Results": [ "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=netdev-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)", "ext-mx06.extmail.prod.ext.phx2.redhat.com;\n\tdmarc=none (p=none dis=none) header.from=redhat.com", "ext-mx06.extmail.prod.ext.phx2.redhat.com;\n\tspf=fail smtp.mailfrom=jasowang@redhat.com" ], "Received": [ "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xz5bf2zcWz9sP1\n\tfor <patchwork-incoming@ozlabs.org>;\n\tFri, 22 Sep 2017 18:04:13 +1000 (AEST)", "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751875AbdIVID7 (ORCPT <rfc822;patchwork-incoming@ozlabs.org>);\n\tFri, 22 Sep 2017 04:03:59 -0400", "from mx1.redhat.com ([209.132.183.28]:57206 \"EHLO mx1.redhat.com\"\n\trhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP\n\tid S1751704AbdIVICy (ORCPT <rfc822;netdev@vger.kernel.org>);\n\tFri, 22 Sep 2017 04:02:54 -0400", "from smtp.corp.redhat.com\n\t(int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15])\n\t(using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby mx1.redhat.com (Postfix) with ESMTPS id 405DD1F57C;\n\tFri, 22 Sep 2017 08:02:54 +0000 (UTC)", "from jason-ThinkPad-T450s.redhat.com (ovpn-12-19.pek2.redhat.com\n\t[10.72.12.19])\n\tby smtp.corp.redhat.com (Postfix) with ESMTP id BDA926266E;\n\tFri, 22 Sep 2017 08:02:51 +0000 (UTC)" ], "DMARC-Filter": "OpenDMARC Filter v1.3.2 mx1.redhat.com 405DD1F57C", "From": "Jason Wang <jasowang@redhat.com>", "To": "mst@redhat.com, jasowang@redhat.com,\n\tvirtualization@lists.linux-foundation.org, netdev@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org", "Cc": "kvm@vger.kernel.org", "Subject": "[PATCH net-next RFC 3/5] vhost: introduce vhost_add_used_idx()", "Date": "Fri, 22 Sep 2017 16:02:33 +0800", "Message-Id": "<1506067355-5771-4-git-send-email-jasowang@redhat.com>", "In-Reply-To": "<1506067355-5771-1-git-send-email-jasowang@redhat.com>", "References": "<1506067355-5771-1-git-send-email-jasowang@redhat.com>", "X-Scanned-By": "MIMEDefang 2.79 on 10.5.11.15", "X-Greylist": "Sender IP whitelisted, not delayed by milter-greylist-4.5.16\n\t(mx1.redhat.com [10.5.110.30]);\n\tFri, 22 Sep 2017 08:02:54 +0000 (UTC)", "Sender": "netdev-owner@vger.kernel.org", "Precedence": "bulk", "List-ID": "<netdev.vger.kernel.org>", "X-Mailing-List": "netdev@vger.kernel.org" }, "content": "This patch introduces a helper which just increase the used idx. This\nwill be used in pair with vhost_prefetch_desc_indices() by batching\ncode.\n\nSigned-off-by: Jason Wang <jasowang@redhat.com>\n---\n drivers/vhost/vhost.c | 33 +++++++++++++++++++++++++++++++++\n drivers/vhost/vhost.h | 1 +\n 2 files changed, 34 insertions(+)", "diff": "diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c\nindex 8424166d..6532cda 100644\n--- a/drivers/vhost/vhost.c\n+++ b/drivers/vhost/vhost.c\n@@ -2178,6 +2178,39 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len)\n }\n EXPORT_SYMBOL_GPL(vhost_add_used);\n \n+int vhost_add_used_idx(struct vhost_virtqueue *vq, int n)\n+{\n+\tu16 old, new;\n+\n+\told = vq->last_used_idx;\n+\tnew = (vq->last_used_idx += n);\n+\t/* If the driver never bothers to signal in a very long while,\n+\t * used index might wrap around. If that happens, invalidate\n+\t * signalled_used index we stored. TODO: make sure driver\n+\t * signals at least once in 2^16 and remove this.\n+\t */\n+\tif (unlikely((u16)(new - vq->signalled_used) < (u16)(new - old)))\n+\t\tvq->signalled_used_valid = false;\n+\n+\t/* Make sure buffer is written before we update index. */\n+\tsmp_wmb();\n+\tif (vhost_put_user(vq, cpu_to_vhost16(vq, vq->last_used_idx),\n+\t\t\t &vq->used->idx)) {\n+\t\tvq_err(vq, \"Failed to increment used idx\");\n+\t\treturn -EFAULT;\n+\t}\n+\tif (unlikely(vq->log_used)) {\n+\t\t/* Log used index update. */\n+\t\tlog_write(vq->log_base,\n+\t\t\t vq->log_addr + offsetof(struct vring_used, idx),\n+\t\t\t sizeof(vq->used->idx));\n+\t\tif (vq->log_ctx)\n+\t\t\teventfd_signal(vq->log_ctx, 1);\n+\t}\n+\treturn 0;\n+}\n+EXPORT_SYMBOL_GPL(vhost_add_used_idx);\n+\n static int __vhost_add_used_n(struct vhost_virtqueue *vq,\n \t\t\t struct vring_used_elem *heads,\n \t\t\t unsigned count)\ndiff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h\nindex 16c2cb6..5dd6c05 100644\n--- a/drivers/vhost/vhost.h\n+++ b/drivers/vhost/vhost.h\n@@ -199,6 +199,7 @@ int __vhost_get_vq_desc(struct vhost_virtqueue *vq,\n void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);\n \n int vhost_vq_init_access(struct vhost_virtqueue *);\n+int vhost_add_used_idx(struct vhost_virtqueue *vq, int n);\n int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);\n int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads,\n \t\t unsigned count);\n", "prefixes": [ "net-next", "RFC", "3/5" ] }