Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755607Ab2JPBot (ORCPT ); Mon, 15 Oct 2012 21:44:49 -0400 Received: from noserose.net ([66.220.18.76]:55194 "HELO noserose.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755532Ab2JPBos (ORCPT ); Mon, 15 Oct 2012 21:44:48 -0400 Date: Mon, 15 Oct 2012 18:44:43 -0700 Message-Id: <5c877eabcdaaa1ee37f1410598ff9b1999aaef1a.1350331035.git.ecashin@coraid.com> In-Reply-To: References: From: Ed Cashin Subject: [PATCH 3/9] aoe: update cap on outstanding commands based on config query response To: akpm@linux-foundation.org Cc: ecashin@coraid.com, linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1926 Lines: 61 The ATA over Ethernet config query response contains a "buffer count" field reflecting the AoE target's capacity to buffer incoming AoE commands. By taking the current value of this field into accound, we increase performance throughput or avoid network congestion, when the value has increased or decreased, respectively. Signed-off-by: Ed Cashin --- drivers/block/aoe/aoe.h | 6 +++--- drivers/block/aoe/aoecmd.c | 6 +++++- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index d2ed7f1..52f75c0 100644 --- a/drivers/block/aoe/aoe.h +++ b/drivers/block/aoe/aoe.h @@ -122,14 +122,14 @@ struct aoeif { struct aoetgt { unsigned char addr[6]; - ushort nframes; + ushort nframes; /* cap on frames to use */ struct aoedev *d; /* parent device I belong to */ struct list_head ffree; /* list of free frames */ struct aoeif ifs[NAOEIFS]; struct aoeif *ifp; /* current aoeif in use */ ushort nout; - ushort maxout; - ulong falloc; + ushort maxout; /* current value for max outstanding */ + ulong falloc; /* number of allocated frames */ ulong lastwadj; /* last window adjustment */ int minbcnt; int wpkts, rpkts; diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 3804a0a..2bb8c7d 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -1373,7 +1373,11 @@ aoecmd_cfg_rsp(struct sk_buff *skb) spin_lock_irqsave(&d->lock, flags); t = gettgt(d, h->src); - if (!t) { + if (t) { + t->nframes = n; + if (n < t->maxout) + t->maxout = n; + } else { t = addtgt(d, h->src, n); if (!t) goto bail; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/