From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6E4AB2B9AD; Tue, 14 May 2024 11:11:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715685064; cv=none; b=YkExA+xHeieu5zzVOLt0MI+T8zACEDE3Hvm3oezc/4hKCwHL9JBcUd1kxaJPxZ4nqoJrT5GGAfWlp0nQzdaGdB5u60G+k0Zd4mvufqDbIyYVNTcArCRlV2vKo7/E9iXqON6pybebPIsfCaGAOaxy1h+vweTO56c7RdEmO4ds1QE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715685064; c=relaxed/simple; bh=vpdBpMtfK/5Dnz1aBsYCYLoz1QBUsh2zzSLGgJSAfNM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BNXR0fOCvz+A+Y562/KYvrFhqUjo+zw52slbx+bdI8aFesvVR899o4Syg90JD6JsXUc5IDM3OAkx6jPKTgNeziASM4MhPUFVpkYJrMYPX8B5VUbnBDDk5WXhEBCwYKaoEY97071VStx8Eq8OI9QfW/gilrp2/gDVVtJl8Hg/Nik= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nKWftMyJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="nKWftMyJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B3FCC2BD10; Tue, 14 May 2024 11:11:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1715685064; bh=vpdBpMtfK/5Dnz1aBsYCYLoz1QBUsh2zzSLGgJSAfNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nKWftMyJMN+OnFDnDXOarezDb9xh4oyldKyNZgo91iwXLcEegqnboe34XNJAdcylZ Wrl7s/fbuXd2Ht/8lVYTWxFMPfM4XrZEZUg02ZMQNl6xj4NWQ2+ZhY2+Nu5iYQOm3q 7kVrkEg3TpF8ClFpwnmqerUdRtlsF++t6t98THrs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Justin Tee , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 6.6 099/301] scsi: lpfc: Update lpfc_ramp_down_queue_handler() logic Date: Tue, 14 May 2024 12:16:10 +0200 Message-ID: <20240514101035.989436732@linuxfoundation.org> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240514101032.219857983@linuxfoundation.org> References: <20240514101032.219857983@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Justin Tee [ Upstream commit bb011631435c705cdeddca68d5c85fd40a4320f9 ] Typically when an out of resource CQE status is detected, the lpfc_ramp_down_queue_handler() logic is called to help reduce I/O load by reducing an sdev's queue_depth. However, the current lpfc_rampdown_queue_depth() logic does not help reduce queue_depth. num_cmd_success is never updated and is always zero, which means new_queue_depth will always be set to sdev->queue_depth. So, new_queue_depth = sdev->queue_depth - new_queue_depth always sets new_queue_depth to zero. And, scsi_change_queue_depth(sdev, 0) is essentially a no-op. Change the lpfc_ramp_down_queue_handler() logic to set new_queue_depth equal to sdev->queue_depth subtracted from number of times num_rsrc_err was incremented. If num_rsrc_err is >= sdev->queue_depth, then set new_queue_depth equal to 1. Eventually, the frequency of Good_Status frames will signal SCSI upper layer to auto increase the queue_depth back to the driver default of 64 via scsi_handle_queue_ramp_up(). Signed-off-by: Justin Tee Link: https://lore.kernel.org/r/20240305200503.57317-5-justintee8345@gmail.com Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/lpfc/lpfc.h | 1 - drivers/scsi/lpfc/lpfc_scsi.c | 13 ++++--------- 2 files changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h index 04d608ea91060..be016732ab2ea 100644 --- a/drivers/scsi/lpfc/lpfc.h +++ b/drivers/scsi/lpfc/lpfc.h @@ -1325,7 +1325,6 @@ struct lpfc_hba { struct timer_list fabric_block_timer; unsigned long bit_flags; atomic_t num_rsrc_err; - atomic_t num_cmd_success; unsigned long last_rsrc_error_time; unsigned long last_ramp_down_time; #ifdef CONFIG_SCSI_LPFC_DEBUG_FS diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index bf879d81846b6..cf506556f3b0b 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -167,11 +167,10 @@ lpfc_ramp_down_queue_handler(struct lpfc_hba *phba) struct Scsi_Host *shost; struct scsi_device *sdev; unsigned long new_queue_depth; - unsigned long num_rsrc_err, num_cmd_success; + unsigned long num_rsrc_err; int i; num_rsrc_err = atomic_read(&phba->num_rsrc_err); - num_cmd_success = atomic_read(&phba->num_cmd_success); /* * The error and success command counters are global per @@ -186,20 +185,16 @@ lpfc_ramp_down_queue_handler(struct lpfc_hba *phba) for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) { shost = lpfc_shost_from_vport(vports[i]); shost_for_each_device(sdev, shost) { - new_queue_depth = - sdev->queue_depth * num_rsrc_err / - (num_rsrc_err + num_cmd_success); - if (!new_queue_depth) - new_queue_depth = sdev->queue_depth - 1; + if (num_rsrc_err >= sdev->queue_depth) + new_queue_depth = 1; else new_queue_depth = sdev->queue_depth - - new_queue_depth; + num_rsrc_err; scsi_change_queue_depth(sdev, new_queue_depth); } } lpfc_destroy_vport_work_array(phba, vports); atomic_set(&phba->num_rsrc_err, 0); - atomic_set(&phba->num_cmd_success, 0); } /** -- 2.43.0