From patchwork Mon Oct 16 12:15:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 13423154 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9F01CDB465 for ; Mon, 16 Oct 2023 12:15:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233643AbjJPMPz (ORCPT ); Mon, 16 Oct 2023 08:15:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36438 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233099AbjJPMPy (ORCPT ); Mon, 16 Oct 2023 08:15:54 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EEF40AC for ; Mon, 16 Oct 2023 05:15:50 -0700 (PDT) Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 700091FEB5; Mon, 16 Oct 2023 12:15:49 +0000 (UTC) Received: from adalid.arch.suse.de (adalid.arch.suse.de [10.161.8.13]) by relay2.suse.de (Postfix) with ESMTP id 2170D2D153; Mon, 16 Oct 2023 12:15:49 +0000 (UTC) Received: by adalid.arch.suse.de (Postfix, from userid 16045) id 34CF251EBDFC; Mon, 16 Oct 2023 14:15:49 +0200 (CEST) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , James Bottomley , linux-scsi@vger.kernel.org, Hannes Reinecke Subject: [PATCH 6/9] scsi_error: iterate over list of failed commands in scsi_eh_bus_reset() Date: Mon, 16 Oct 2023 14:15:39 +0200 Message-Id: <20231016121542.111501-7-hare@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20231016121542.111501-1-hare@suse.de> References: <20231016121542.111501-1-hare@suse.de> MIME-Version: 1.0 X-Spamd-Bar: ++++++++++++++ Authentication-Results: smtp-out2.suse.de; dkim=none; dmarc=none; spf=softfail (smtp-out2.suse.de: 149.44.160.134 is neither permitted nor denied by domain of hare@suse.de) smtp.mailfrom=hare@suse.de X-Rspamd-Server: rspamd2 X-Spamd-Result: default: False [14.49 / 50.00]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_MISSING_CHARSET(2.50)[]; NEURAL_SPAM_SHORT(2.00)[1.000]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.20)[suse.de]; BROKEN_CONTENT_TYPE(1.50)[]; R_SPF_SOFTFAIL(0.60)[~all:c]; RCPT_COUNT_FIVE(0.00)[5]; TO_MATCH_ENVRCPT_SOME(0.00)[]; VIOLATED_DIRECT_SPF(3.50)[]; MX_GOOD(-0.01)[]; NEURAL_SPAM_LONG(3.00)[1.000]; MID_CONTAINS_FROM(1.00)[]; RWL_MAILSPIKE_GOOD(0.00)[149.44.160.134:from]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.20)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; BAYES_HAM(-0.00)[13.12%] X-Rspamd-Queue-Id: 700091FEB5 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Iterating over all possible bus number in scsi_eh_bus_reset() is inefficient as not all busses may be affected during SCSI EH. So rewrite the loop in scsi_eh_bus_reset() to match the loop in scsi_eh_target_reset() and only loop over failed commands. Signed-off-by: Hannes Reinecke Reviewed-by: Christoph Hellwig --- drivers/scsi/scsi_error.c | 62 ++++++++++++++++----------------------- 1 file changed, 25 insertions(+), 37 deletions(-) diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index cdbad217d013..9f0ee01b319d 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -1703,21 +1703,20 @@ static int scsi_eh_bus_reset(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { - struct scsi_cmnd *scmd, *chan_scmd, *next; + LIST_HEAD(tmp_list); LIST_HEAD(check_list); - unsigned int channel; - enum scsi_disposition rtn; - /* - * we really want to loop over the various channels, and do this on - * a channel by channel basis. we should also check to see if any - * of the failed commands are on soft_reset devices, and if so, skip - * the reset. - */ + list_splice_init(work_q, &tmp_list); + + while (!list_empty(&tmp_list)) { + struct scsi_cmnd *next, *scmd; + enum scsi_disposition rtn; + unsigned int channel; - for (channel = 0; channel <= shost->max_channel; channel++) { if (scsi_host_eh_past_deadline(shost)) { + /* push back on work queue for further processing */ list_splice_init(&check_list, work_q); + list_splice_init(&tmp_list, work_q); SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: skip BRST, past eh deadline\n", @@ -1725,43 +1724,32 @@ static int scsi_eh_bus_reset(struct Scsi_Host *shost, return list_empty(work_q); } - chan_scmd = NULL; - list_for_each_entry(scmd, work_q, eh_entry) { - if (channel == scmd_channel(scmd)) { - chan_scmd = scmd; - break; - /* - * FIXME add back in some support for - * soft_reset devices. - */ - } - } + scmd = list_first_entry(&tmp_list, struct scsi_cmnd, eh_entry); + channel = scmd_channel(scmd); - if (!chan_scmd) - continue; SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: Sending BRST chan: %d\n", current->comm, channel)); - rtn = scsi_try_bus_reset(chan_scmd); - if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { - list_for_each_entry_safe(scmd, next, work_q, eh_entry) { - if (channel == scmd_channel(scmd)) { - if (rtn == FAST_IO_FAIL) - __scsi_eh_finish_cmd(scmd, - done_q, - DID_TRANSPORT_DISRUPTED); - else - list_move_tail(&scmd->eh_entry, - &check_list); - } - } - } else { + rtn = scsi_try_bus_reset(scmd); + if (rtn != SUCCESS && rtn != FAST_IO_FAIL) { SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: BRST failed chan: %d\n", current->comm, channel)); } + list_for_each_entry_safe(scmd, next, work_q, eh_entry) { + if (scmd_channel(scmd) != channel) + continue; + + if (rtn == SUCCESS) + list_move_tail(&scmd->eh_entry, &check_list); + else if (rtn == FAST_IO_FAIL) + __scsi_eh_finish_cmd(scmd, done_q, + DID_TRANSPORT_DISRUPTED); + else + list_move_tail(&scmd->eh_entry, work_q); + } } return scsi_eh_test_devices(&check_list, work_q, done_q, 0); }