From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756596AbcIFThD (ORCPT ); Tue, 6 Sep 2016 15:37:03 -0400 Received: from p3plsmtps2ded03.prod.phx3.secureserver.net ([208.109.80.60]:39118 "EHLO p3plsmtps2ded03.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755902AbcIFThB (ORCPT ); Tue, 6 Sep 2016 15:37:01 -0400 x-originating-ip: 72.167.245.219 From: Long Li To: "K. Y. Srinivasan" , Haiyang Zhang , "James E.J. Bottomley" , "Martin K. Petersen" Cc: devel@linuxdriverproject.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Long Li Subject: [PATCH 1/3] storvsc: use tagged SRB requests if supported by the device Date: Tue, 6 Sep 2016 14:25:41 -0700 Message-Id: <1473197143-16760-2-git-send-email-longli@exchange.microsoft.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1473197143-16760-1-git-send-email-longli@exchange.microsoft.com> References: <1473197143-16760-1-git-send-email-longli@exchange.microsoft.com> X-CMAE-Envelope: MS4wfLgehNTugP/7k6rwyfvOuqtf4p22Kq2h70SKe5aTjgFmfsOvxSz8Pysezh3dNYPiQPPGz5ZJInztsqLerqpm2FYvwrxdDPkaTf9jIL56NSthPfDc4OJt nXVUXE8/QWPbb9PG6x7sWK/5e2bqr1ZjTV85D5Seomq6ZIO0FJdmmr3N/xUFRK3Lq0a/Ug/tSsfuSFzf+Iuq1TfbpZeRUcuuMG5jZDS0M/sYwsfDI3zghTza TykbLJn60d6pmEfAoD5yDH5CUzZsZ/Uet6M3qIkOsjDDYrO3GffLFSkJYPwSRdt+vf40A8V6HJNKLfdS7evlbXS/49Br2ay1vEQlG6riE74KIhVv6EMvqq+Z eFwqBnMFMyTMGYN/h1tyYdrEp69YZj2q8D6/zKaUtiGxmUzbDKReFYwKMvLQExg7iGeFIr1yUE/7IYLvJa9P0i/vRvshPw== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Long Li Properly set SRB flags when hosting device supports tagged queuing. This patch improves the performance on Fiber Channel disks. --- drivers/scsi/storvsc_drv.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 8ccfc9e..a8f3e4c 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -136,6 +136,8 @@ struct hv_fc_wwn_packet { #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 +#define SP_UNTAGGED ((unsigned char) ~0) +#define SRB_SIMPLE_TAG_REQUEST 0x20 /* * Platform neutral description of a scsi request - @@ -1451,6 +1453,12 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DISABLE_SYNCH_TRANSFER; + if(scmnd->device->tagged_supported) { + vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); + vm_srb->win8_extension.queue_tag = SP_UNTAGGED; + vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; + } + /* Build the SRB */ switch (scmnd->sc_data_direction) { case DMA_TO_DEVICE: -- 1.8.5.6