From patchwork Mon Oct 26 19:06:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Disseldorp X-Patchwork-Id: 11858459 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 46AB814B7 for ; Mon, 26 Oct 2020 19:13:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3293720878 for ; Mon, 26 Oct 2020 19:13:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1792636AbgJZTNp (ORCPT ); Mon, 26 Oct 2020 15:13:45 -0400 Received: from mx2.suse.de ([195.135.220.15]:44154 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1736547AbgJZTH0 (ORCPT ); Mon, 26 Oct 2020 15:07:26 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C4ABCAE5C; Mon, 26 Oct 2020 19:07:25 +0000 (UTC) From: David Disseldorp To: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org, David Disseldorp Subject: [PATCH v2 1/5] lib/scatterlist: use consistent sg_copy_buffer() return type Date: Mon, 26 Oct 2020 20:06:42 +0100 Message-Id: <20201026190646.8727-2-ddiss@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201026190646.8727-1-ddiss@suse.de> References: <20201026190646.8727-1-ddiss@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org sg_copy_buffer() returns a size_t with the number of bytes copied. Return 0 instead of false if the copy is skipped. Signed-off-by: David Disseldorp Reviewed-by: Douglas Gilbert --- lib/scatterlist.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/scatterlist.c b/lib/scatterlist.c index 0a482ef988e5..a59778946404 100644 --- a/lib/scatterlist.c +++ b/lib/scatterlist.c @@ -933,7 +933,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, sg_miter_start(&miter, sgl, nents, sg_flags); if (!sg_miter_skip(&miter, skip)) - return false; + return 0; while ((offset < buflen) && sg_miter_next(&miter)) { unsigned int len; From patchwork Mon Oct 26 19:06:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Disseldorp X-Patchwork-Id: 11858463 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B70F8139F for ; Mon, 26 Oct 2020 19:13:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A636B22265 for ; Mon, 26 Oct 2020 19:13:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1792645AbgJZTNr (ORCPT ); Mon, 26 Oct 2020 15:13:47 -0400 Received: from mx2.suse.de ([195.135.220.15]:44164 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406080AbgJZTH1 (ORCPT ); Mon, 26 Oct 2020 15:07:27 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 04504AF0D; Mon, 26 Oct 2020 19:07:26 +0000 (UTC) From: David Disseldorp To: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org, David Disseldorp Subject: [PATCH v2 2/5] scsi: target: rename struct sense_info to sense_detail Date: Mon, 26 Oct 2020 20:06:43 +0100 Message-Id: <20201026190646.8727-3-ddiss@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201026190646.8727-1-ddiss@suse.de> References: <20201026190646.8727-1-ddiss@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org This helps distinguish it from the SCSI sense INFORMATION field. Signed-off-by: David Disseldorp --- drivers/target/target_core_transport.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index ff26ab0a5f60..caa3a7b34826 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3094,14 +3094,14 @@ bool transport_wait_for_tasks(struct se_cmd *cmd) } EXPORT_SYMBOL(transport_wait_for_tasks); -struct sense_info { +struct sense_detail { u8 key; u8 asc; u8 ascq; bool add_sector_info; }; -static const struct sense_info sense_info_table[] = { +static const struct sense_detail sense_detail_table[] = { [TCM_NO_SENSE] = { .key = NOT_READY }, @@ -3261,39 +3261,39 @@ static const struct sense_info sense_info_table[] = { */ static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) { - const struct sense_info *si; + const struct sense_detail *sd; u8 *buffer = cmd->sense_buffer; int r = (__force int)reason; u8 key, asc, ascq; bool desc_format = target_sense_desc_format(cmd->se_dev); - if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key) - si = &sense_info_table[r]; + if (r < ARRAY_SIZE(sense_detail_table) && sense_detail_table[r].key) + sd = &sense_detail_table[r]; else - si = &sense_info_table[(__force int) + sd = &sense_detail_table[(__force int) TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE]; - key = si->key; + key = sd->key; if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) { if (!core_scsi3_ua_for_check_condition(cmd, &key, &asc, &ascq)) { cmd->scsi_status = SAM_STAT_BUSY; return; } - } else if (si->asc == 0) { + } else if (sd->asc == 0) { WARN_ON_ONCE(cmd->scsi_asc == 0); asc = cmd->scsi_asc; ascq = cmd->scsi_ascq; } else { - asc = si->asc; - ascq = si->ascq; + asc = sd->asc; + ascq = sd->ascq; } cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; cmd->scsi_status = SAM_STAT_CHECK_CONDITION; cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; scsi_build_sense_buffer(desc_format, buffer, key, asc, ascq); - if (si->add_sector_info) + if (sd->add_sector_info) WARN_ON_ONCE(scsi_set_sense_information(buffer, cmd->scsi_sense_length, cmd->bad_sector) < 0); From patchwork Mon Oct 26 19:06:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Disseldorp X-Patchwork-Id: 11858465 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2DFA1157C for ; Mon, 26 Oct 2020 19:13:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 19A6921D41 for ; Mon, 26 Oct 2020 19:13:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1792646AbgJZTNv (ORCPT ); Mon, 26 Oct 2020 15:13:51 -0400 Received: from mx2.suse.de ([195.135.220.15]:44178 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392685AbgJZTH2 (ORCPT ); Mon, 26 Oct 2020 15:07:28 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 5BFC3AFB2; Mon, 26 Oct 2020 19:07:26 +0000 (UTC) From: David Disseldorp To: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org, David Disseldorp Subject: [PATCH v2 3/5] scsi: target: rename cmd.bad_sector to cmd.sense_info Date: Mon, 26 Oct 2020 20:06:44 +0100 Message-Id: <20201026190646.8727-4-ddiss@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201026190646.8727-1-ddiss@suse.de> References: <20201026190646.8727-1-ddiss@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org cmd.bad_sector currently gets packed into the sense INFORMATION field for TCM_LOGICAL_BLOCK_{GUARD,APP_TAG,REF_TAG}_CHECK_FAILED errors, which carry an .add_sector_info flag in the sense_detail_table to ensure this. In preparation for propagating a byte offset on COMPARE AND WRITE TCM_MISCOMPARE_VERIFY error, rename cmd.bad_sector to cmd.sense_info and sense_detail.add_sector_info to sense_detail.add_sense_info so that it better reflects the sense INFORMATION field destination. Signed-off-by: David Disseldorp --- drivers/target/target_core_sbc.c | 2 +- drivers/target/target_core_transport.c | 12 ++++++------ include/target/target_core_base.h | 2 +- 3 files changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 6e8b8d30938f..5f77dd95f1b9 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -1439,7 +1439,7 @@ sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, if (rc) { kunmap_atomic(daddr - dsg->offset); kunmap_atomic(paddr - psg->offset); - cmd->bad_sector = sector; + cmd->sense_info = sector; return rc; } next: diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index caa3a7b34826..c6f45c12d564 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3098,7 +3098,7 @@ struct sense_detail { u8 key; u8 asc; u8 ascq; - bool add_sector_info; + bool add_sense_info; }; static const struct sense_detail sense_detail_table[] = { @@ -3201,19 +3201,19 @@ static const struct sense_detail sense_detail_table[] = { .key = ABORTED_COMMAND, .asc = 0x10, .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */ - .add_sector_info = true, + .add_sense_info = true, }, [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = { .key = ABORTED_COMMAND, .asc = 0x10, .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ - .add_sector_info = true, + .add_sense_info = true, }, [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = { .key = ABORTED_COMMAND, .asc = 0x10, .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ - .add_sector_info = true, + .add_sense_info = true, }, [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = { .key = COPY_ABORTED, @@ -3293,10 +3293,10 @@ static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) cmd->scsi_status = SAM_STAT_CHECK_CONDITION; cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; scsi_build_sense_buffer(desc_format, buffer, key, asc, ascq); - if (sd->add_sector_info) + if (sd->add_sense_info) WARN_ON_ONCE(scsi_set_sense_information(buffer, cmd->scsi_sense_length, - cmd->bad_sector) < 0); + cmd->sense_info) < 0); } int diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 549947d407cf..7ee2bee46b3a 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -540,7 +540,7 @@ struct se_cmd { struct scatterlist *t_prot_sg; unsigned int t_prot_nents; sense_reason_t pi_err; - sector_t bad_sector; + u64 sense_info; int cpuid; }; From patchwork Mon Oct 26 19:06:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Disseldorp X-Patchwork-Id: 11858483 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 70C3714B7 for ; Mon, 26 Oct 2020 19:14:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5855B2080A for ; Mon, 26 Oct 2020 19:14:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1792639AbgJZTNq (ORCPT ); Mon, 26 Oct 2020 15:13:46 -0400 Received: from mx2.suse.de ([195.135.220.15]:44194 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1736590AbgJZTH1 (ORCPT ); Mon, 26 Oct 2020 15:07:27 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 97B03AFC8; Mon, 26 Oct 2020 19:07:26 +0000 (UTC) From: David Disseldorp To: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org, David Disseldorp Subject: [PATCH v2 4/5] scsi: target: split out COMPARE AND WRITE memcmp into helper Date: Mon, 26 Oct 2020 20:06:45 +0100 Message-Id: <20201026190646.8727-5-ddiss@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201026190646.8727-1-ddiss@suse.de> References: <20201026190646.8727-1-ddiss@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In preparation for finding and returning the miscompare offset. Signed-off-by: David Disseldorp --- drivers/target/target_core_sbc.c | 121 +++++++++++++++++-------------- 1 file changed, 68 insertions(+), 53 deletions(-) diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 5f77dd95f1b9..22d0cbba6ff3 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -434,20 +434,75 @@ static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, return ret; } +/* + * compare @cmp_len bytes of @read_sgl with @cmp_sgl. On miscompare return + * TCM_MISCOMPARE_VERIFY. + */ +static sense_reason_t +compare_and_write_do_cmp(struct scatterlist *read_sgl, unsigned int read_nents, + struct scatterlist *cmp_sgl, unsigned int cmp_nents, + unsigned int cmp_len) +{ + unsigned char *buf = NULL; + struct scatterlist *sg; + sense_reason_t ret; + unsigned int offset; + size_t rc; + int i; + + buf = kzalloc(cmp_len, GFP_KERNEL); + if (!buf) { + ret = TCM_OUT_OF_RESOURCES; + goto out; + } + + rc = sg_copy_to_buffer(cmp_sgl, cmp_nents, buf, cmp_len); + if (!rc) { + pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); + ret = TCM_OUT_OF_RESOURCES; + goto out; + } + /* + * Compare SCSI READ payload against verify payload + */ + offset = 0; + for_each_sg(read_sgl, sg, read_nents, i) { + unsigned int len = min(sg->length, cmp_len); + unsigned char *addr = kmap_atomic(sg_page(sg)); + + if (memcmp(addr, buf + offset, len)) { + pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", + addr, buf + offset); + kunmap_atomic(addr); + ret = TCM_MISCOMPARE_VERIFY; + goto out; + } + kunmap_atomic(addr); + + offset += len; + cmp_len -= len; + if (!cmp_len) + break; + } + pr_debug("COMPARE AND WRITE read data matches compare data\n"); + ret = TCM_NO_SENSE; +out: + kfree(buf); + return ret; +} + static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, int *post_ret) { struct se_device *dev = cmd->se_dev; struct sg_table write_tbl = { }; - struct scatterlist *write_sg, *sg; - unsigned char *buf = NULL, *addr; + struct scatterlist *write_sg; struct sg_mapping_iter m; - unsigned int offset = 0, len; - unsigned int nlbas = cmd->t_task_nolb; + unsigned int len; unsigned int block_size = dev->dev_attrib.block_size; - unsigned int compare_len = (nlbas * block_size); + unsigned int compare_len = (cmd->t_task_nolb * block_size); sense_reason_t ret = TCM_NO_SENSE; - int rc, i; + int i; /* * Handle early failure in transport_generic_request_failure(), @@ -473,12 +528,13 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes goto out; } - buf = kzalloc(cmd->data_length, GFP_KERNEL); - if (!buf) { - pr_err("Unable to allocate compare_and_write buf\n"); - ret = TCM_OUT_OF_RESOURCES; + ret = compare_and_write_do_cmp(cmd->t_bidi_data_sg, + cmd->t_bidi_data_nents, + cmd->t_data_sg, + cmd->t_data_nents, + compare_len); + if (ret) goto out; - } if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) { pr_err("Unable to allocate compare_and_write sg\n"); @@ -486,44 +542,9 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes goto out; } write_sg = write_tbl.sgl; - /* - * Setup verify and write data payloads from total NumberLBAs. - */ - rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, - cmd->data_length); - if (!rc) { - pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); - ret = TCM_OUT_OF_RESOURCES; - goto out; - } - /* - * Compare against SCSI READ payload against verify payload - */ - for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { - addr = (unsigned char *)kmap_atomic(sg_page(sg)); - if (!addr) { - ret = TCM_OUT_OF_RESOURCES; - goto out; - } - - len = min(sg->length, compare_len); - - if (memcmp(addr, buf + offset, len)) { - pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", - addr, buf + offset); - kunmap_atomic(addr); - goto miscompare; - } - kunmap_atomic(addr); - - offset += len; - compare_len -= len; - if (!compare_len) - break; - } i = 0; - len = cmd->t_task_nolb * block_size; + len = compare_len; sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); /* * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. @@ -568,13 +589,8 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes __target_execute_cmd(cmd, false); - kfree(buf); return ret; -miscompare: - pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", - dev->transport->name); - ret = TCM_MISCOMPARE_VERIFY; out: /* * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in @@ -582,7 +598,6 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes */ up(&dev->caw_sem); sg_free_table(&write_tbl); - kfree(buf); return ret; } From patchwork Mon Oct 26 19:06:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Disseldorp X-Patchwork-Id: 11858467 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8E46A14B7 for ; Mon, 26 Oct 2020 19:13:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 79A1B20878 for ; Mon, 26 Oct 2020 19:13:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1792650AbgJZTNx (ORCPT ); Mon, 26 Oct 2020 15:13:53 -0400 Received: from mx2.suse.de ([195.135.220.15]:44208 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1736957AbgJZTH3 (ORCPT ); Mon, 26 Oct 2020 15:07:29 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C8BBBAFCD; Mon, 26 Oct 2020 19:07:26 +0000 (UTC) From: David Disseldorp To: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org, David Disseldorp Subject: [PATCH v2 5/5] scsi: target: return COMPARE AND WRITE miscompare offsets Date: Mon, 26 Oct 2020 20:06:46 +0100 Message-Id: <20201026190646.8727-6-ddiss@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201026190646.8727-1-ddiss@suse.de> References: <20201026190646.8727-1-ddiss@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org SBC-4 r15 5.3 COMPARE AND WRITE command states: if the compare operation does not indicate a match, then terminate the command with CHECK CONDITION status with the sense key set to MISCOMPARE and the additional sense code set to MISCOMPARE DURING VERIFY OPERATION. In the sense data (see 4.18 and SPC-5) the offset from the start of the Data-Out Buffer to the first byte of data that was not equal shall be reported in the INFORMATION field. This change implements the missing logic to report the miscompare offset in the sense data INFORMATION field. Signed-off-by: David Disseldorp --- drivers/target/target_core_sbc.c | 34 ++++++++++++++++++-------- drivers/target/target_core_transport.c | 1 + 2 files changed, 25 insertions(+), 10 deletions(-) diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 22d0cbba6ff3..0fa52a98d6cf 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -435,13 +435,13 @@ static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, } /* - * compare @cmp_len bytes of @read_sgl with @cmp_sgl. On miscompare return - * TCM_MISCOMPARE_VERIFY. + * compare @cmp_len bytes of @read_sgl with @cmp_sgl. On miscompare, fill + * @miscmp_off and return TCM_MISCOMPARE_VERIFY. */ static sense_reason_t compare_and_write_do_cmp(struct scatterlist *read_sgl, unsigned int read_nents, struct scatterlist *cmp_sgl, unsigned int cmp_nents, - unsigned int cmp_len) + unsigned int cmp_len, unsigned int *miscmp_off) { unsigned char *buf = NULL; struct scatterlist *sg; @@ -467,17 +467,20 @@ compare_and_write_do_cmp(struct scatterlist *read_sgl, unsigned int read_nents, */ offset = 0; for_each_sg(read_sgl, sg, read_nents, i) { + unsigned int i; unsigned int len = min(sg->length, cmp_len); unsigned char *addr = kmap_atomic(sg_page(sg)); - if (memcmp(addr, buf + offset, len)) { - pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", - addr, buf + offset); - kunmap_atomic(addr); + for (i = 0; i < len && addr[i] == buf[offset + i]; i++) + ; + kunmap_atomic(addr); + if (i < len) { + *miscmp_off = offset + i; + pr_warn("Detected MISCOMPARE at offset %u\n", + *miscmp_off); ret = TCM_MISCOMPARE_VERIFY; goto out; } - kunmap_atomic(addr); offset += len; cmp_len -= len; @@ -501,6 +504,7 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes unsigned int len; unsigned int block_size = dev->dev_attrib.block_size; unsigned int compare_len = (cmd->t_task_nolb * block_size); + unsigned int miscmp_off = 0; sense_reason_t ret = TCM_NO_SENSE; int i; @@ -532,8 +536,18 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes cmd->t_bidi_data_nents, cmd->t_data_sg, cmd->t_data_nents, - compare_len); - if (ret) + compare_len, + &miscmp_off); + if (ret == TCM_MISCOMPARE_VERIFY) { + /* + * SBC-4 r15: 5.3 COMPARE AND WRITE command + * In the sense data (see 4.18 and SPC-5) the offset from the + * start of the Data-Out Buffer to the first byte of data that + * was not equal shall be reported in the INFORMATION field. + */ + cmd->sense_info = miscmp_off; + goto out; + } else if (ret) goto out; if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) { diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index c6f45c12d564..693ed3fe4388 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3196,6 +3196,7 @@ static const struct sense_detail sense_detail_table[] = { .key = MISCOMPARE, .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */ .ascq = 0x00, + .add_sense_info = true, }, [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = { .key = ABORTED_COMMAND,