From patchwork Fri Dec 20 09:51:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 13916429 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1D968199E84 for ; Fri, 20 Dec 2024 09:51:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734688279; cv=none; b=P85S5PXgZKGYnmnwyEuGO6aaU+4eoLrwrp+8ysScuo6YTFnfU6GR1Udx7mMp9nhvGbq+ykK8YiTH9Y055ASkDH69vdw34HDJF9+mBFH/VhwSeJVKrTUpE8uW7WtkEHjv/MtVLwpILUmZPUUhplIHofV57hh0EOk++GYLWGfaE+Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734688279; c=relaxed/simple; bh=g/QDBHQyttOxZZtzqO75xNJmVtK8xvqODSyt8y5XPq4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uENv6pkJ2BlyhcxjvxHsv/h1cq6VR02gOpnAV9isjRk9BMv+fjEF/XRuwAa5Dg641NA0t5UFhg8ip4ZagfEgZ0Eqplu23pXNSSvHNFpTW7SjcEsFgmYdi2aqH5OQTnCdcLSl1KNwoh2uZ1rfWEj8gXdkMoVmEk1YQ5HiBDVIDcQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BC2Kb+oh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BC2Kb+oh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A0F34C4CEDC; Fri, 20 Dec 2024 09:51:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734688278; bh=g/QDBHQyttOxZZtzqO75xNJmVtK8xvqODSyt8y5XPq4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BC2Kb+ohWtJ+im1iqEk3Syz60TOLG/cb2HrY/RFwVbO+Nb9/zxjWRyBVCs66eqGLV p0jixhiqZAI+OBfb0FmMuNppfIL57oyW30VzcNdQA35Df8OfRekpHzMy/gOWVPAFrO NRUZHQHl7m+AfwIef0YlVi+JA9NU/dT5nfap0kfFdWGzKmyhVccrD1+stcnEByXvxD rmBeHtXLcdpJPRu/0hiOMIpz2MI8HzZRD2kJSjQr5xqKgpAA0Sr1j/XGR48snbcW0F 1ad5kmp8+bg8vIGuGieR3E649E8zbuXd1e62YV5COtvnQnDsCzQqk6ys02eU7cYZER 9ns/nF0fbN0qw== From: Damien Le Moal To: linux-nvme@lists.infradead.org, Christoph Hellwig , Keith Busch , Sagi Grimberg , linux-pci@vger.kernel.org, Manivannan Sadhasivam , =?utf-8?q?Krzyszt?= =?utf-8?q?of_Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , Lorenzo Pieralisi Cc: Rick Wertenbroek , Niklas Cassel Subject: [PATCH v7 16/18] nvmet: Implement arbitration feature support Date: Fri, 20 Dec 2024 18:51:06 +0900 Message-ID: <20241220095108.601914-17-dlemoal@kernel.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241220095108.601914-1-dlemoal@kernel.org> References: <20241220095108.601914-1-dlemoal@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 NVMe base specification v2.1 mandates support for the arbitration feature (NVME_FEAT_ARBITRATION). Introduce the data structure struct nvmet_feat_arbitration to define the high, medium and low priority weight fields and the arbitration burst field of this feature and implement the functions nvmet_get_feat_arbitration() and nvmet_set_feat_arbitration() functions to get and set these fields. Since there is no generic way to implement support for the arbitration feature, these functions respectively use the controller get_feature() and set_feature() operations to process the feature with the help of the controller driver. If the controller driver does not implement these operations and a get feature command or a set feature command for this feature is received, the command is failed with an invalid field error. Signed-off-by: Damien Le Moal Reviewed-by: Christoph Hellwig Tested-by: Rick Wertenbroek --- drivers/nvme/target/admin-cmd.c | 51 +++++++++++++++++++++++++++++++-- drivers/nvme/target/nvmet.h | 7 +++++ 2 files changed, 56 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index 8b8ec33330b2..3ddd8e44e148 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -1324,6 +1324,25 @@ static u16 nvmet_set_feat_irq_config(struct nvmet_req *req) return ctrl->ops->set_feature(ctrl, NVME_FEAT_IRQ_CONFIG, &irqcfg); } +static u16 nvmet_set_feat_arbitration(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + u32 cdw11 = le32_to_cpu(req->cmd->common.cdw11); + struct nvmet_feat_arbitration arb = { + .hpw = (cdw11 >> 24) & 0xff, + .mpw = (cdw11 >> 16) & 0xff, + .lpw = (cdw11 >> 8) & 0xff, + .ab = cdw11 & 0x3, + }; + + if (!ctrl->ops->set_feature) { + req->error_loc = offsetof(struct nvme_common_command, cdw10); + return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR; + } + + return ctrl->ops->set_feature(ctrl, NVME_FEAT_ARBITRATION, &arb); +} + void nvmet_execute_set_features(struct nvmet_req *req) { struct nvmet_subsys *subsys = nvmet_req_subsys(req); @@ -1337,6 +1356,9 @@ void nvmet_execute_set_features(struct nvmet_req *req) return; switch (cdw10 & 0xff) { + case NVME_FEAT_ARBITRATION: + status = nvmet_set_feat_arbitration(req); + break; case NVME_FEAT_NUM_QUEUES: ncqr = (cdw11 >> 16) & 0xffff; nsqr = cdw11 & 0xffff; @@ -1446,6 +1468,30 @@ static u16 nvmet_get_feat_irq_config(struct nvmet_req *req) return NVME_SC_SUCCESS; } +static u16 nvmet_get_feat_arbitration(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + struct nvmet_feat_arbitration arb = { }; + u16 status; + + if (!ctrl->ops->get_feature) { + req->error_loc = offsetof(struct nvme_common_command, cdw10); + return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR; + } + + status = ctrl->ops->get_feature(ctrl, NVME_FEAT_ARBITRATION, &arb); + if (status != NVME_SC_SUCCESS) + return status; + + nvmet_set_result(req, + ((u32)arb.hpw << 24) | + ((u32)arb.mpw << 16) | + ((u32)arb.lpw << 8) | + (arb.ab & 0x3)); + + return NVME_SC_SUCCESS; +} + void nvmet_get_feat_kato(struct nvmet_req *req) { nvmet_set_result(req, req->sq->ctrl->kato * 1000); @@ -1472,8 +1518,6 @@ void nvmet_execute_get_features(struct nvmet_req *req) * need to come up with some fake values for these. */ #if 0 - case NVME_FEAT_ARBITRATION: - break; case NVME_FEAT_POWER_MGMT: break; case NVME_FEAT_TEMP_THRESH: @@ -1483,6 +1527,9 @@ void nvmet_execute_get_features(struct nvmet_req *req) case NVME_FEAT_WRITE_ATOMIC: break; #endif + case NVME_FEAT_ARBITRATION: + status = nvmet_get_feat_arbitration(req); + break; case NVME_FEAT_IRQ_COALESCE: status = nvmet_get_feat_irq_coalesce(req); break; diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index 999a4ebf597e..f4df458df9db 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -921,4 +921,11 @@ struct nvmet_feat_irq_config { bool cd; }; +struct nvmet_feat_arbitration { + u8 hpw; + u8 mpw; + u8 lpw; + u8 ab; +}; + #endif /* _NVMET_H */