From patchwork Thu May 12 11:12:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 12847590 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 7FD03C433EF for ; Thu, 12 May 2022 11:13:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353096AbiELLNn (ORCPT ); Thu, 12 May 2022 07:13:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47090 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353041AbiELLM6 (ORCPT ); Thu, 12 May 2022 07:12:58 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A33E565D0D for ; Thu, 12 May 2022 04:12:53 -0700 (PDT) Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 634E71F935; Thu, 12 May 2022 11:12:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1652353966; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=afNDgdCMsbxlbqYImqGCF65kYSrnWmCqxVEFBqiN78g=; b=jPj8759LniirFdHje4MFsojOlwW7NHFhm4E0L/Nbzi5qdtQ7AN5UJVZwQWpLwzcTC2SDA1 862V4yMoUW4bvwNrfJncBFuv0+7h74sKZcBxOOAaDr94pgG7MKSnQdKUGf0DwjJQ3Esd7U BB9vY1PU6up6s7YyJbH4RGaUr9vD7xA= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1652353966; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=afNDgdCMsbxlbqYImqGCF65kYSrnWmCqxVEFBqiN78g=; b=80HJoqQ4aTt5OmzADuedmo9qDt1P2s7TGiNCDQ0PUnIqzkCM6D/1Vh0u038RkALiQYz8qd izQ2lHtawqgF+5BQ== Received: from adalid.arch.suse.de (adalid.arch.suse.de [10.161.8.13]) by relay2.suse.de (Postfix) with ESMTP id 545972C15F; Thu, 12 May 2022 11:12:46 +0000 (UTC) Received: by adalid.arch.suse.de (Postfix, from userid 16045) id 2F91F51943F8; Thu, 12 May 2022 13:12:46 +0200 (CEST) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , James Bottomley , linux-scsi@vger.kernel.org, Hannes Reinecke , Johannes Thumshirn Subject: [PATCH 16/20] snic: reserve tag for TMF Date: Thu, 12 May 2022 13:12:32 +0200 Message-Id: <20220512111236.109851-17-hare@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20220512111236.109851-1-hare@suse.de> References: <20220512111236.109851-1-hare@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Rather than re-using the failed command the snic driver should reserve one command for TMFs. Signed-off-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn --- drivers/scsi/snic/snic.h | 2 +- drivers/scsi/snic/snic_main.c | 8 +++++++ drivers/scsi/snic/snic_scsi.c | 44 +++++++++++++++++------------------ 3 files changed, 31 insertions(+), 23 deletions(-) diff --git a/drivers/scsi/snic/snic.h b/drivers/scsi/snic/snic.h index 4ec7e30678e1..28059b66f191 100644 --- a/drivers/scsi/snic/snic.h +++ b/drivers/scsi/snic/snic.h @@ -380,7 +380,7 @@ int snic_queuecommand(struct Scsi_Host *, struct scsi_cmnd *); int snic_abort_cmd(struct scsi_cmnd *); int snic_device_reset(struct scsi_cmnd *); int snic_host_reset(struct scsi_cmnd *); -int snic_reset(struct Scsi_Host *, struct scsi_cmnd *); +int snic_reset(struct Scsi_Host *); void snic_shutdown_scsi_cleanup(struct snic *); diff --git a/drivers/scsi/snic/snic_main.c b/drivers/scsi/snic/snic_main.c index 29d56396058c..3375153dd636 100644 --- a/drivers/scsi/snic/snic_main.c +++ b/drivers/scsi/snic/snic_main.c @@ -663,6 +663,14 @@ snic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) goto err_get_conf; } + /* + * Hack alert: reduce can_queue by one after scsi_add_host() + * had been called. + * This essentially reserves the topmost request for TMF. + * Should be replaced by reserved command + * once support is being added. + */ + shost->can_queue--; snic_set_state(snic, SNIC_ONLINE); ret = snic_disc_start(snic); diff --git a/drivers/scsi/snic/snic_scsi.c b/drivers/scsi/snic/snic_scsi.c index 5f17666f3e1d..e69bed855a39 100644 --- a/drivers/scsi/snic/snic_scsi.c +++ b/drivers/scsi/snic/snic_scsi.c @@ -1018,17 +1018,6 @@ snic_hba_reset_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq) "reset_cmpl: type = %x, hdr_stat = %x, cmnd_id = %x, hid = %x, ctx = %lx\n", typ, hdr_stat, cmnd_id, hid, ctx); - /* spl case, host reset issued through ioctl */ - if (cmnd_id == SCSI_NO_TAG) { - rqi = (struct snic_req_info *) ctx; - SNIC_HOST_INFO(snic->shost, - "reset_cmpl:Tag %d ctx %lx cmpl stat %s\n", - cmnd_id, ctx, snic_io_status_to_str(hdr_stat)); - sc = rqi->sc; - - goto ioctl_hba_rst; - } - if (cmnd_id >= snic->max_tag_id) { SNIC_HOST_ERR(snic->shost, "reset_cmpl: Tag 0x%x out of Range,HdrStat %s\n", @@ -1039,7 +1028,6 @@ snic_hba_reset_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq) } sc = scsi_host_find_tag(snic->shost, cmnd_id); -ioctl_hba_rst: if (!sc) { atomic64_inc(&snic->s_stats.io.sc_null); SNIC_HOST_ERR(snic->shost, @@ -1725,7 +1713,7 @@ snic_dr_clean_single_req(struct snic *snic, { struct snic_req_info *rqi = NULL; struct snic_tgt *tgt = NULL; - struct scsi_cmnd *sc = NULL; + struct scsi_cmnd *sc; spinlock_t *io_lock = NULL; u32 sv_state = 0, tmf = 0; DECLARE_COMPLETION_ONSTACK(tm_done); @@ -2238,13 +2226,6 @@ snic_issue_hba_reset(struct snic *snic, struct scsi_cmnd *sc) goto hba_rst_end; } - if (snic_cmd_tag(sc) == SCSI_NO_TAG) { - memset(scsi_cmd_priv(sc), 0, - sizeof(struct snic_internal_io_state)); - SNIC_HOST_INFO(snic->shost, "issu_hr:Host reset thru ioctl.\n"); - rqi->sc = sc; - } - req = rqi_to_req(rqi); io_lock = snic_io_lock_hash(snic, sc); @@ -2319,11 +2300,13 @@ snic_issue_hba_reset(struct snic *snic, struct scsi_cmnd *sc) } /* end of snic_issue_hba_reset */ int -snic_reset(struct Scsi_Host *shost, struct scsi_cmnd *sc) +snic_reset(struct Scsi_Host *shost) { struct snic *snic = shost_priv(shost); + struct scsi_cmnd *sc = NULL; enum snic_state sv_state; unsigned long flags; + u32 start_time = jiffies; int ret = FAILED; /* Set snic state as SNIC_FWRESET*/ @@ -2348,6 +2331,19 @@ snic_reset(struct Scsi_Host *shost, struct scsi_cmnd *sc) while (atomic_read(&snic->ios_inflight)) schedule_timeout(msecs_to_jiffies(1)); + /* The topmost command is reserved for TMF */ + sc = scsi_host_find_tag(shost, snic->max_tag_id - 1); + if (!sc) { + SNIC_HOST_ERR(shost, + "reset:Host Reset Failed to allocate sc.\n"); + spin_lock_irqsave(&snic->snic_lock, flags); + snic_set_state(snic, sv_state); + spin_unlock_irqrestore(&snic->snic_lock, flags); + atomic64_inc(&snic->s_stats.reset.hba_reset_fail); + ret = FAILED; + + goto reset_end; + } ret = snic_issue_hba_reset(snic, sc); if (ret) { SNIC_HOST_ERR(shost, @@ -2365,6 +2361,10 @@ snic_reset(struct Scsi_Host *shost, struct scsi_cmnd *sc) ret = SUCCESS; reset_end: + SNIC_TRC(shost->host_no, sc ? snic_cmd_tag(sc) : SCSI_NO_TAG, + (ulong) sc, jiffies_to_msecs(jiffies - start_time), + 0, 0, 0); + return ret; } /* end of snic_reset */ @@ -2387,7 +2387,7 @@ snic_host_reset(struct scsi_cmnd *sc) sc, sc->cmnd[0], scsi_cmd_to_rq(sc), snic_cmd_tag(sc), CMD_FLAGS(sc)); - ret = snic_reset(shost, sc); + ret = snic_reset(shost); SNIC_TRC(shost->host_no, snic_cmd_tag(sc), (ulong) sc, jiffies_to_msecs(jiffies - start_time),