From patchwork Tue Feb 1 19:01:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 12732168 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 57DD5C433EF for ; Tue, 1 Feb 2022 19:01:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240738AbiBATBo (ORCPT ); Tue, 1 Feb 2022 14:01:44 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:41054 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238402AbiBATBk (ORCPT ); Tue, 1 Feb 2022 14:01:40 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 938D3B82F71; Tue, 1 Feb 2022 19:01:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B8C5C340ED; Tue, 1 Feb 2022 19:01:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643742098; bh=X74BnOg4IqWFvwMGEZm0zB6g12VahyiocXPpi50JsKY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CRRqNDjjYZhgwQtE7XZ8/vIlNgBt61b7qpm9gneiXK9qdpGcBLMPfVDTOZ27iu10C skPHcuhlFXf138w4PoPrdQpoieVNduSp8u/oogwSVSGqRTiEusEqA+ctk/n4rzvUH4 8if3/XAjqjmHzZt1Bb/LI+u3YCf6FKHMIDenJWG8FKlsLumZtYf/1hRi5AkqVXGYRu T/OKzDUxMWFWu8xo+mTsU+zrU5cAqIB3VQf3T89lvViTFGJoCpqwnxSh6iEC1C26sW ZwMm0Ss0Bz62DxQzS8yS4lJ/t4XZ6ykuESW7ERDtGCUUDC5E3BAfeWfWLQ/Q6B8/tp 1ZSqV4gIZ0+NQ== From: Keith Busch To: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Cc: axboe@kernel.dk, hch@lst.de, martin.petersen@oracle.com, colyli@suse.de, Keith Busch Subject: [PATCHv2 6/7] block: add pi for nvme enhanced integrity Date: Tue, 1 Feb 2022 11:01:27 -0800 Message-Id: <20220201190128.3075065-7-kbusch@kernel.org> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20220201190128.3075065-1-kbusch@kernel.org> References: <20220201190128.3075065-1-kbusch@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org The NVMe specification defines larger data integrity formats beyond the t10 tuple. Add support for the specification defined CRC64 formats, assuming the reference tag does not need to be split with the "storage tag". Cc: "Martin K. Petersen" Signed-off-by: Keith Busch Reviewed-by: Hannes Reinecke --- block/Kconfig | 1 + block/t10-pi.c | 194 +++++++++++++++++++++++++++++++++++++++++ include/linux/t10-pi.h | 20 +++++ 3 files changed, 215 insertions(+) diff --git a/block/Kconfig b/block/Kconfig index 205f8d01c695..e3ce9196ad07 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -75,6 +75,7 @@ config BLK_DEV_INTEGRITY_T10 tristate depends on BLK_DEV_INTEGRITY select CRC_T10DIF + select CRC64 config BLK_DEV_ZONED bool "Zoned block device support" diff --git a/block/t10-pi.c b/block/t10-pi.c index 758a76518854..7bfefe970bc5 100644 --- a/block/t10-pi.c +++ b/block/t10-pi.c @@ -7,8 +7,10 @@ #include #include #include +#include #include #include +#include typedef __be16 (csum_fn) (void *, unsigned int); @@ -278,4 +280,196 @@ const struct blk_integrity_profile t10_pi_type3_ip = { }; EXPORT_SYMBOL(t10_pi_type3_ip); +static __be64 nvme_pi_crc64(void *data, unsigned int len) +{ + return cpu_to_be64(crc64_rocksoft(~0ULL, data, len)); +} + +static blk_status_t nvme_crc64_generate(struct blk_integrity_iter *iter, + enum t10_dif_type type) +{ + unsigned int i; + + for (i = 0 ; i < iter->data_size ; i += iter->interval) { + struct nvme_crc64_pi_tuple *pi = iter->prot_buf; + + pi->guard_tag = nvme_pi_crc64(iter->data_buf, iter->interval); + pi->app_tag = 0; + + if (type == T10_PI_TYPE1_PROTECTION) + put_unaligned_be48(iter->seed, pi->ref_tag); + else + put_unaligned_be48(0ULL, pi->ref_tag); + + iter->data_buf += iter->interval; + iter->prot_buf += iter->tuple_size; + iter->seed++; + } + + return BLK_STS_OK; +} + +static bool nvme_crc64_ref_escape(u8 *ref_tag) +{ + static u8 ref_escape[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; + + return memcmp(ref_tag, ref_escape, sizeof(ref_escape)) == 0; +} + +static blk_status_t nvme_crc64_verify(struct blk_integrity_iter *iter, + enum t10_dif_type type) +{ + unsigned int i; + + for (i = 0; i < iter->data_size; i += iter->interval) { + struct nvme_crc64_pi_tuple *pi = iter->prot_buf; + u64 ref, seed; + __be64 csum; + + if (type == T10_PI_TYPE1_PROTECTION) { + if (pi->app_tag == T10_PI_APP_ESCAPE) + goto next; + + ref = get_unaligned_be48(pi->ref_tag); + seed = iter->seed & 0xffffffffffffull; + if (ref != seed) { + pr_err("%s: ref tag error at location %llu (rcvd %llu)\n", + iter->disk_name, seed, ref); + return BLK_STS_PROTECTION; + } + } else if (type == T10_PI_TYPE3_PROTECTION) { + if (pi->app_tag == T10_PI_APP_ESCAPE && + nvme_crc64_ref_escape(pi->ref_tag)) + goto next; + } + + csum = nvme_pi_crc64(iter->data_buf, iter->interval); + if (pi->guard_tag != csum) { + pr_err("%s: guard tag error at sector %llu " \ + "(rcvd %016llx, want %016llx)\n", + iter->disk_name, (unsigned long long)iter->seed, + be64_to_cpu(pi->guard_tag), be64_to_cpu(csum)); + return BLK_STS_PROTECTION; + } + +next: + iter->data_buf += iter->interval; + iter->prot_buf += iter->tuple_size; + iter->seed++; + } + + return BLK_STS_OK; +} + +static blk_status_t nvme_pi_type1_verify_crc(struct blk_integrity_iter *iter) +{ + return nvme_crc64_verify(iter, T10_PI_TYPE1_PROTECTION); +} + +static blk_status_t nvme_pi_type1_generate_crc(struct blk_integrity_iter *iter) +{ + return nvme_crc64_generate(iter, T10_PI_TYPE1_PROTECTION); +} + +static void nvme_pi_type1_prepare(struct request *rq) +{ + const int tuple_sz = rq->q->integrity.tuple_size; + u64 ref_tag = nvme_pi_extended_ref_tag(rq); + struct bio *bio; + + __rq_for_each_bio(bio, rq) { + struct bio_integrity_payload *bip = bio_integrity(bio); + u64 virt = bip_get_seed(bip) & 0xffffffffffffull; + struct bio_vec iv; + struct bvec_iter iter; + + /* Already remapped? */ + if (bip->bip_flags & BIP_MAPPED_INTEGRITY) + break; + + bip_for_each_vec(iv, bip, iter) { + unsigned int j; + void *p; + + p = bvec_kmap_local(&iv); + for (j = 0; j < iv.bv_len; j += tuple_sz) { + struct nvme_crc64_pi_tuple *pi = p; + u64 ref = get_unaligned_be48(pi->ref_tag); + + if (ref == virt) + put_unaligned_be48(ref_tag, pi->ref_tag); + virt++; + ref_tag++; + p += tuple_sz; + } + kunmap_local(p); + } + + bip->bip_flags |= BIP_MAPPED_INTEGRITY; + } +} + +static void nvme_pi_type1_complete(struct request *rq, unsigned int nr_bytes) +{ + unsigned intervals = nr_bytes >> rq->q->integrity.interval_exp; + const int tuple_sz = rq->q->integrity.tuple_size; + u64 ref_tag = nvme_pi_extended_ref_tag(rq); + struct bio *bio; + + __rq_for_each_bio(bio, rq) { + struct bio_integrity_payload *bip = bio_integrity(bio); + u64 virt = bip_get_seed(bip) & 0xffffffffffffull; + struct bio_vec iv; + struct bvec_iter iter; + + bip_for_each_vec(iv, bip, iter) { + unsigned int j; + void *p; + + p = bvec_kmap_local(&iv); + for (j = 0; j < iv.bv_len && intervals; j += tuple_sz) { + struct nvme_crc64_pi_tuple *pi = p; + u64 ref = get_unaligned_be48(pi->ref_tag); + + if (ref == ref_tag) + put_unaligned_be48(virt, pi->ref_tag); + virt++; + ref_tag++; + intervals--; + p += tuple_sz; + } + kunmap_local(p); + } + } +} + +static blk_status_t nvme_pi_type3_verify_crc(struct blk_integrity_iter *iter) +{ + return nvme_crc64_verify(iter, T10_PI_TYPE3_PROTECTION); +} + +static blk_status_t nvme_pi_type3_generate_crc(struct blk_integrity_iter *iter) +{ + return nvme_crc64_generate(iter, T10_PI_TYPE3_PROTECTION); +} + +const struct blk_integrity_profile nvme_pi_type1_crc64 = { + .name = "NVME-DIF-TYPE1-CRC64", + .generate_fn = nvme_pi_type1_generate_crc, + .verify_fn = nvme_pi_type1_verify_crc, + .prepare_fn = nvme_pi_type1_prepare, + .complete_fn = nvme_pi_type1_complete, +}; +EXPORT_SYMBOL(nvme_pi_type1_crc64); + +const struct blk_integrity_profile nvme_pi_type3_crc64 = { + .name = "NVME-DIF-TYPE3-CRC64", + .generate_fn = nvme_pi_type3_generate_crc, + .verify_fn = nvme_pi_type3_verify_crc, + .prepare_fn = t10_pi_type3_prepare, + .complete_fn = t10_pi_type3_complete, +}; +EXPORT_SYMBOL(nvme_pi_type3_crc64); + +MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL"); diff --git a/include/linux/t10-pi.h b/include/linux/t10-pi.h index c635c2e014e3..fd3a9b99500a 100644 --- a/include/linux/t10-pi.h +++ b/include/linux/t10-pi.h @@ -53,4 +53,24 @@ extern const struct blk_integrity_profile t10_pi_type1_ip; extern const struct blk_integrity_profile t10_pi_type3_crc; extern const struct blk_integrity_profile t10_pi_type3_ip; +struct nvme_crc64_pi_tuple { + __be64 guard_tag; + __be16 app_tag; + __u8 ref_tag[6]; +}; + +static inline u64 nvme_pi_extended_ref_tag(struct request *rq) +{ + unsigned int shift = ilog2(queue_logical_block_size(rq->q)); + +#ifdef CONFIG_BLK_DEV_INTEGRITY + if (rq->q->integrity.interval_exp) + shift = rq->q->integrity.interval_exp; +#endif + return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffffffffull; +} + +extern const struct blk_integrity_profile nvme_pi_type1_crc64; +extern const struct blk_integrity_profile nvme_pi_type3_crc64; + #endif