From patchwork Wed Nov 23 20:38:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacob Keller X-Patchwork-Id: 13054264 X-Patchwork-Delegate: kuba@kernel.org 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 D88BCC4332F for ; Wed, 23 Nov 2022 20:39:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233984AbiKWUjK (ORCPT ); Wed, 23 Nov 2022 15:39:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240338AbiKWUiq (ORCPT ); Wed, 23 Nov 2022 15:38:46 -0500 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5EBAF26FB for ; Wed, 23 Nov 2022 12:38:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1669235925; x=1700771925; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=V6DZxQeOlPm8ZHZdAvEeFXF2dWM/sdWOPF65c+26ino=; b=OqyCKLQoTU0fJMeFGXUUw9Ns6QV01N9fwh7Fr9N9kGt5O/7Y03b6hBq/ mzZaOW7mjZO34ocsH1OkNEaS/kAtwrlNIkkZlmIZckdz9voTBL6tCjCRq Hx2sFGyu1aH4m15ScFuDKjqWVcVYqKj4xckpRvnIyvlR/yO5WFnxYFBgc hzUrhiupcIWUpNJIhHuItP5LqD1tFBj55/yAvFhvtAhn+PYsZJ5V0O1J2 tNkn2f8dM7aDGYorj9+5G22Qre3ItUreEerRiuJf2rEt5+JznudV64w5M yyw9zJvnFYVBn2N6EsN/NOg7hDWgqlyc0GZp/iXfMeHGdemZ1o5JbulBg Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10540"; a="315307138" X-IronPort-AV: E=Sophos;i="5.96,187,1665471600"; d="scan'208";a="315307138" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Nov 2022 12:38:41 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10540"; a="619756068" X-IronPort-AV: E=Sophos;i="5.96,187,1665471600"; d="scan'208";a="619756068" Received: from jekeller-desk.amr.corp.intel.com (HELO jekeller-desk.jekeller.internal) ([10.166.241.7]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Nov 2022 12:38:41 -0800 From: Jacob Keller To: netdev@vger.kernel.org Cc: Jacob Keller , Jiri Pirko , Jakub Kicinski Subject: [PATCH net-next v2 9/9] ice: implement direct read for NVM and Shadow RAM regions Date: Wed, 23 Nov 2022 12:38:34 -0800 Message-Id: <20221123203834.738606-10-jacob.e.keller@intel.com> X-Mailer: git-send-email 2.38.1.420.g319605f8f00e In-Reply-To: <20221123203834.738606-1-jacob.e.keller@intel.com> References: <20221123203834.738606-1-jacob.e.keller@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Implement the .read handler for the NVM and Shadow RAM regions. This enables user space to read a small chunk of the flash without needing the overhead of creating a full snapshot. Update the documentation for ice to detail which regions have direct read support. Signed-off-by: Jacob Keller --- Changes since v1 * Update documentation for ice.rst Documentation/networking/devlink/ice.rst | 8 ++- drivers/net/ethernet/intel/ice/ice_devlink.c | 69 ++++++++++++++++++++ 2 files changed, 75 insertions(+), 2 deletions(-) diff --git a/Documentation/networking/devlink/ice.rst b/Documentation/networking/devlink/ice.rst index bcd4839fbf79..625efb3777d5 100644 --- a/Documentation/networking/devlink/ice.rst +++ b/Documentation/networking/devlink/ice.rst @@ -198,8 +198,12 @@ device data. - The contents of the device firmware's capabilities buffer. Useful to determine the current state and configuration of the device. -Users can request an immediate capture of a snapshot via the -``DEVLINK_CMD_REGION_NEW`` +Both the ``nvm-flash`` and ``shadow-ram`` regions can be accessed without a +snapshot. The ``device-caps`` region requires a snapshot as the contents are +sent by firmware and can't be split into separate reads. + +Users can request an immediate capture of a snapshot for all three regions +via the ``DEVLINK_CMD_REGION_NEW`` command. .. code:: shell diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c index 9d3500291d2e..946d64e577c9 100644 --- a/drivers/net/ethernet/intel/ice/ice_devlink.c +++ b/drivers/net/ethernet/intel/ice/ice_devlink.c @@ -1687,6 +1687,73 @@ static int ice_devlink_nvm_snapshot(struct devlink *devlink, return 0; } +/** + * ice_devlink_nvm_read - Read a portion of NVM flash contents + * @devlink: the devlink instance + * @ops: the devlink region to snapshot + * @extack: extended ACK response structure + * @offset: the offset to start at + * @size: the amount to read + * @data: the data buffer to read into + * + * This function is called in response to DEVLINK_CMD_REGION_READ to directly + * read a section of the NVM contents. + * + * It reads from either the nvm-flash or shadow-ram region contents. + * + * @returns zero on success, and updates the data pointer. Returns a non-zero + * error code on failure. + */ +static int ice_devlink_nvm_read(struct devlink *devlink, + const struct devlink_region_ops *ops, + struct netlink_ext_ack *extack, + u64 offset, u32 size, u8 *data) +{ + struct ice_pf *pf = devlink_priv(devlink); + struct device *dev = ice_pf_to_dev(pf); + struct ice_hw *hw = &pf->hw; + bool read_shadow_ram; + u64 nvm_size; + int status; + + if (ops == &ice_nvm_region_ops) { + read_shadow_ram = false; + nvm_size = hw->flash.flash_size; + } else if (ops == &ice_sram_region_ops) { + read_shadow_ram = true; + nvm_size = hw->flash.sr_words * 2u; + } else { + NL_SET_ERR_MSG_MOD(extack, "Unexpected region in snapshot function"); + return -EOPNOTSUPP; + } + + if (offset + size >= nvm_size) { + NL_SET_ERR_MSG_MOD(extack, "Cannot read beyond the region size"); + return -ERANGE; + } + + status = ice_acquire_nvm(hw, ICE_RES_READ); + if (status) { + dev_dbg(dev, "ice_acquire_nvm failed, err %d aq_err %d\n", + status, hw->adminq.sq_last_status); + NL_SET_ERR_MSG_MOD(extack, "Failed to acquire NVM semaphore"); + return -EIO; + } + + status = ice_read_flat_nvm(hw, (u32)offset, &size, data, + read_shadow_ram); + if (status) { + dev_dbg(dev, "ice_read_flat_nvm failed after reading %u bytes, err %d aq_err %d\n", + size, status, hw->adminq.sq_last_status); + NL_SET_ERR_MSG_MOD(extack, "Failed to read NVM contents"); + ice_release_nvm(hw); + return -EIO; + } + ice_release_nvm(hw); + + return 0; +} + /** * ice_devlink_devcaps_snapshot - Capture snapshot of device capabilities * @devlink: the devlink instance @@ -1735,12 +1802,14 @@ static const struct devlink_region_ops ice_nvm_region_ops = { .name = "nvm-flash", .destructor = vfree, .snapshot = ice_devlink_nvm_snapshot, + .read = ice_devlink_nvm_read, }; static const struct devlink_region_ops ice_sram_region_ops = { .name = "shadow-ram", .destructor = vfree, .snapshot = ice_devlink_nvm_snapshot, + .read = ice_devlink_nvm_read, }; static const struct devlink_region_ops ice_devcaps_region_ops = {