From patchwork Wed Apr 15 05:51:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Klaus Jensen X-Patchwork-Id: 11489835 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 AB685174A for ; Wed, 15 Apr 2020 06:08:13 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8C83720936 for ; Wed, 15 Apr 2020 06:08:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8C83720936 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=irrelevant.dk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:43784 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jObDY-0006MH-KM for patchwork-qemu-devel@patchwork.kernel.org; Wed, 15 Apr 2020 02:08:12 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35897) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jOazK-0003Oi-AS for qemu-devel@nongnu.org; Wed, 15 Apr 2020 01:53:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jOazJ-000352-3u for qemu-devel@nongnu.org; Wed, 15 Apr 2020 01:53:30 -0400 Received: from charlie.dont.surf ([128.199.63.193]:47596) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jOazF-0002ki-9Z; Wed, 15 Apr 2020 01:53:25 -0400 Received: from apples.local (80-167-98-190-cable.dk.customer.tdc.net [80.167.98.190]) by charlie.dont.surf (Postfix) with ESMTPSA id EF176BFE03; Wed, 15 Apr 2020 05:52:33 +0000 (UTC) From: Klaus Jensen To: qemu-block@nongnu.org Subject: [PATCH v7 43/48] nvme: add support for sgl bit bucket descriptor Date: Wed, 15 Apr 2020 07:51:35 +0200 Message-Id: <20200415055140.466900-44-its@irrelevant.dk> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200415055140.466900-1-its@irrelevant.dk> References: <20200415055140.466900-1-its@irrelevant.dk> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 128.199.63.193 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Beata Michalska , Klaus Jensen , Gollu Appalanaidu , qemu-devel@nongnu.org, Max Reitz , Klaus Jensen , Keith Busch , Javier Gonzalez , Maxim Levitsky Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Gollu Appalanaidu This adds support for SGL descriptor type 0x1 (bit bucket descriptor). See the NVM Express v1.3d specification, Section 4.4 ("Scatter Gather List (SGL)"). Signed-off-by: Gollu Appalanaidu Signed-off-by: Klaus Jensen --- hw/block/nvme.c | 33 +++++++++++++++++++++++++++------ 1 file changed, 27 insertions(+), 6 deletions(-) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index a19085e605e7..f295f027b8e2 100644 --- a/hw/block/nvme.c +++ b/hw/block/nvme.c @@ -375,6 +375,10 @@ static uint16_t nvme_map_sgl_data(NvmeCtrl *n, QEMUSGList *qsg, uint8_t type = NVME_SGL_TYPE(segment[i].type); switch (type) { + case NVME_SGL_DESCR_TYPE_BIT_BUCKET: + if (nvme_req_is_write(req)) { + continue; + } case NVME_SGL_DESCR_TYPE_DATA_BLOCK: break; case NVME_SGL_DESCR_TYPE_SEGMENT: @@ -385,6 +389,7 @@ static uint16_t nvme_map_sgl_data(NvmeCtrl *n, QEMUSGList *qsg, } dlen = le32_to_cpu(segment[i].len); + if (!dlen) { continue; } @@ -405,6 +410,11 @@ static uint16_t nvme_map_sgl_data(NvmeCtrl *n, QEMUSGList *qsg, } trans_len = MIN(*len, dlen); + + if (type == NVME_SGL_DESCR_TYPE_BIT_BUCKET) { + goto next; + } + addr = le64_to_cpu(segment[i].addr); if (UINT64_MAX - addr < dlen) { @@ -416,6 +426,7 @@ static uint16_t nvme_map_sgl_data(NvmeCtrl *n, QEMUSGList *qsg, return status; } +next: *len -= trans_len; } @@ -486,7 +497,8 @@ static uint16_t nvme_map_sgl(NvmeCtrl *n, QEMUSGList *qsg, QEMUIOVector *iov, seg_len = le32_to_cpu(sgld->len); /* check the length of the (Last) Segment descriptor */ - if (!seg_len || seg_len & 0xf) { + if ((!seg_len || seg_len & 0xf) && + (NVME_SGL_TYPE(sgld->type) != NVME_SGL_DESCR_TYPE_BIT_BUCKET)) { return NVME_INVALID_SGL_SEG_DESCR | NVME_DNR; } @@ -523,19 +535,27 @@ static uint16_t nvme_map_sgl(NvmeCtrl *n, QEMUSGList *qsg, QEMUIOVector *iov, last_sgld = &segment[nsgld - 1]; - /* if the segment ends with a Data Block, then we are done */ - if (NVME_SGL_TYPE(last_sgld->type) == NVME_SGL_DESCR_TYPE_DATA_BLOCK) { + /* + * If the segment ends with a Data Block or Bit Bucket Descriptor Type, + * then we are done. + */ + switch (NVME_SGL_TYPE(last_sgld->type)) { + case NVME_SGL_DESCR_TYPE_DATA_BLOCK: + case NVME_SGL_DESCR_TYPE_BIT_BUCKET: status = nvme_map_sgl_data(n, qsg, iov, segment, nsgld, &len, req); if (status) { goto unmap; } goto out; + + default: + break; } /* - * If the last descriptor was not a Data Block, then the current - * segment must not be a Last Segment. + * If the last descriptor was not a Data Block or Bit Bucket, then the + * current segment must not be a Last Segment. */ if (NVME_SGL_TYPE(sgld->type) == NVME_SGL_DESCR_TYPE_LAST_SEGMENT) { status = NVME_INVALID_SGL_SEG_DESCR | NVME_DNR; @@ -2537,7 +2557,8 @@ static void nvme_init_ctrl(NvmeCtrl *n) id->nn = cpu_to_le32(n->num_namespaces); id->oncs = cpu_to_le16(NVME_ONCS_WRITE_ZEROES | NVME_ONCS_TIMESTAMP); - id->sgls = cpu_to_le32(NVME_CTRL_SGLS_SUPPORTED_NO_ALIGNMENT); + id->sgls = cpu_to_le32(NVME_CTRL_SGLS_SUPPORTED_NO_ALIGNMENT | + NVME_CTRL_SGLS_BITBUCKET); pstrcpy((char *) id->subnqn, sizeof(id->subnqn), "nqn.2019-08.org.qemu:"); pstrcat((char *) id->subnqn, sizeof(id->subnqn), n->params.serial);