From owner-freebsd-hackers@freebsd.org Thu Sep 10 14:57:23 2020 Return-Path: Delivered-To: freebsd-hackers@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id F42113D99D8 for ; Thu, 10 Sep 2020 14:57:22 +0000 (UTC) (envelope-from chuck@tuffli.net) Received: from mail-ej1-x630.google.com (mail-ej1-x630.google.com [IPv6:2a00:1450:4864:20::630]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BnMS21XSTz46pY for ; Thu, 10 Sep 2020 14:57:21 +0000 (UTC) (envelope-from chuck@tuffli.net) Received: by mail-ej1-x630.google.com with SMTP id o8so9151529ejb.10 for ; Thu, 10 Sep 2020 07:57:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuffli-net.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ASyhl7QcHcbRv/AUN5I+SczpyRxMvrJ/Ck2vxA9WtjY=; b=1ZDZ0VWiDfOt1PGaj4LVDvJyN7Hs5GQKwjvgPJUF84da0HtT4TSUNi6ay/GOZ6apnt EhLQHXyD9PhxfAfWeK/hPL6DV775KcF20cUMSRaIy5PAEnT9TFcIYPHmbyoHFkXJXBPg wCwTGlhfAZgiQOVSU1Ai+Pe66YhVaREjqAWGbnIYW92RI2nVQoAeLMisszgU2wcz4l5U xn8dPC1sXPgUU/EpSAwwI2tKrYeqCouLPEAFOgBlxNCcPvrdNiAhZ+WjXOonHsQFrH9y VtF+Pg0Acnc0h8bwZ4ZD+pWMUA7W8bkQnLkIETItVxm2RKTvs0/wksxRnNRY14RZUn2q F5kw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ASyhl7QcHcbRv/AUN5I+SczpyRxMvrJ/Ck2vxA9WtjY=; b=RKYqvc/RFbHu62hYH88an12D9fUBnvDdLenwq9m+7KZONvxWwSEUk3LKGxBYKKHfiR hav0rzp+KCH3/JH6HHGSQ1HiXkt3hFsdSzXEPPBpPxgJPZwuNYV45+Ov6gYReFHCXVHf PO9oMw4NDyD9YS8vpqmZIHq8sQMX1AkqTHhNkzCyC+tsFmwa1Rzbni92YRw3oWafSi1v 5ksdh3qZkGqx5IyLJYdqnnyN741g2F0j98YNoF9cxRjq80gROLAbo4lFh1QzkbeV/Fhv A8F7Au6Uln3OY9b9yjkfPgZ97+siEa87ozrS6flEO6k47XyJ34Vrool2vvq2sJEWwlrU gzTw== X-Gm-Message-State: AOAM530Z8SGqYRFopD0OeCtHlX5DaoDDaqR9Sm95pFTUGjMHqGzRYS0d fWBhI2GtTxLMBy5Rv3UbDOJ0nrih1w0fmglHrApAa9Zqw5DXNQ== X-Google-Smtp-Source: ABdhPJzJLrvC8Lz3RiaK/hCbu7x1Fq0Pudh1K4XRstPevekJF+bJx0eLXnuMCrcldI+rhVUATaomIu9+jVAZdoRUo1A= X-Received: by 2002:a17:907:2173:: with SMTP id rl19mr9068171ejb.514.1599749840356; Thu, 10 Sep 2020 07:57:20 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Chuck Tuffli Date: Thu, 10 Sep 2020 07:57:09 -0700 Message-ID: Subject: Re: sendin raw scsi command To: Wojciech Puchar Cc: FreeBSD Hackers X-Rspamd-Queue-Id: 4BnMS21XSTz46pY X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=tuffli-net.20150623.gappssmtp.com header.s=20150623 header.b=1ZDZ0VWi; dmarc=none; spf=permerror (mx1.freebsd.org: domain of chuck@tuffli.net uses mechanism not recognized by this client) smtp.mailfrom=chuck@tuffli.net X-Spamd-Result: default: False [-2.50 / 15.00]; RCVD_TLS_ALL(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[tuffli-net.20150623.gappssmtp.com:s=20150623]; FREEFALL_USER(0.00)[chuck]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_MEDIUM(-1.01)[-1.011]; NEURAL_HAM_LONG(-0.99)[-0.991]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; DMARC_NA(0.00)[tuffli.net]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; R_SPF_PERMFAIL(0.00)[empty SPF record]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::630:from]; DKIM_TRACE(0.00)[tuffli-net.20150623.gappssmtp.com:+]; NEURAL_HAM_SHORT(-0.20)[-0.198]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-hackers] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.33 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Sep 2020 14:57:23 -0000 On Thu, Sep 3, 2020 at 6:06 AM Wojciech Puchar wrote: > i already figured how to list SCSI devices in FreeBSD and find what > interest me from C language. > > After doing so - how can i send raw SCSI command? > > That's all i need. > > CAM layer userland interface is quite complex. > There are two approaches: camcontrol(8) and cam(3) You can send send arbitrary commands via camcontrol(8)'s cmd. An example of sending an ATA SMART READ command: # camcontrol cmd ada0 -a "B0 D0 00 4F C2 00 00 00 00 00 00 00" -i 512 - | od -tx1 The same can be done with SCSI devices, obviously with a different byte stream :) camcontrol(8) uses cam(3) (a.k.a. libcam) under the covers to send commands to devices via a C library. There are examples in the tree of how to do this. I've used this approach myself in a small project that collects SMART data from SCSI, ATA, and NVMe devices (see https://foss.heptapod.net/bsdutils/smart with most of the CAM related things in freebsd_dev.c). Hope that helps. --chuck