From mboxrd@z Thu Jan 1 00:00:00 1970 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 C45423E274C; Wed, 25 Mar 2026 14:51:45 +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=1774450305; cv=none; b=FAj4l0In7rfk/mOxipJjUtsk8CWnef4v/Lv02dqqebAonnNIN7fe2nQhgLq+ME5cGY3Qs5CCmg7WL6i+2uO7QOQgG4bjN3lwy7IjbFqsbmVBY9hCHspeaIsRz/gm5D2JO/igWcZvSOmWDUlAKcxkyjEzNfVOw5/NRysxg/WA044= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774450305; c=relaxed/simple; bh=8AXpAN699RP7gwJQ3Z5T+xRlw6cLSkUIePQ/vZEoTEY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=mWXCEbSg3+rBrinhKNWnxjBqFxmMYHnKKgztURomcvWcxF9NkT1uegZ4lAFTBK+nNj7/gNiCBWPvx6oGssqKTEuS/Vlxj8FLdZZPEQIIbDq1SHNcVPAlnZCepj4q2BqMMY8n9mofPle8f1rca6hLoMSZ8VcrF9ysjj1t87IH6tE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tcof19Id; 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="tcof19Id" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 02094C4DDF4; Wed, 25 Mar 2026 14:51:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774450305; bh=8AXpAN699RP7gwJQ3Z5T+xRlw6cLSkUIePQ/vZEoTEY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tcof19IdZhNk3LrpwvSqZGw6S2w0lYwRpd15VsTUFgphy8JhkX5e+sDg8izFJKZfZ 0WKQwmhyrwz5x7d9qQQXF3IAwGBVPcGRy6qS0RUOkmTPcuG/p0xwp5Fb6J/oNRob6b kP0ZaFHTEjk1ktfrnFp4J/xmWSbye55f0580NtEegxhJUgNAIO+LMDUevQkXv20ydh BtY02iCpZ9PrENeev+5EIjHkblIdMf8sYPOd31Jd0WfxYQyzw2z8i87XnMTXBXfp/W iBn/c3tAttHZMhxexBdCkdwG070I5CIIS+iV8eZVK9unmT+vOPE7zd21hZEaxsaQm6 RMcULCtqlJJJA== From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= To: netdev@vger.kernel.org, "David S. Miller" , Andrew Lunn , Donald Hunter , Eric Dumazet , Jakub Kicinski , Maxime Chevallier , Naveen Mamindlapalli , Paolo Abeni , Simon Horman Cc: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Danielle Ratson , Hariprasad Kelam , Ido Schimmel , Kory Maincent , Leon Romanovsky , Michael Chan , Oleksij Rempel , Pavan Chebbi , Piergiorgio Beruto , Russell King , Saeed Mahameed , Shuah Khan , Tariq Toukan , Willem de Bruijn , Kees Cook , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-rdma@vger.kernel.org Subject: [PATCH net-next v2 11/12] netdevsim: Add module EEPROM simulation via debugfs Date: Wed, 25 Mar 2026 15:50:18 +0100 Message-ID: <20260325145022.2607545-12-bjorn@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260325145022.2607545-1-bjorn@kernel.org> References: <20260325145022.2607545-1-bjorn@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add get/set_module_eeprom_by_page ethtool ops to netdevsim, enabling testing of kernel features that depend on module EEPROM access (e.g. CMIS loopback) without real hardware. The EEPROM is backed by a 256-page x 128-byte array exposed as binary debugfs files under ports//ethtool/module/pages/{0..255}. Offsets 0-127 map to page 0 (lower memory), 128-255 to the requested page's upper memory, following the CMIS layout. Error injection via get_err and set_err follows the existing netdevsim pattern. Signed-off-by: Björn Töpel --- drivers/net/netdevsim/ethtool.c | 83 +++++++++++++++++++++++++++++++ drivers/net/netdevsim/netdevsim.h | 11 ++++ 2 files changed, 94 insertions(+) diff --git a/drivers/net/netdevsim/ethtool.c b/drivers/net/netdevsim/ethtool.c index 39c681284700..1ef48802fcbd 100644 --- a/drivers/net/netdevsim/ethtool.c +++ b/drivers/net/netdevsim/ethtool.c @@ -247,6 +247,68 @@ static int nsim_set_loopback(struct net_device *dev, return 1; } +static u8 *nsim_module_eeprom_ptr(struct netdevsim *ns, + const struct ethtool_module_eeprom *page_data, + u32 *len) +{ + u32 offset; + u8 page; + + if (page_data->offset < NSIM_MODULE_EEPROM_PAGE_LEN) { + page = 0; + offset = page_data->offset; + } else { + page = page_data->page; + offset = page_data->offset - NSIM_MODULE_EEPROM_PAGE_LEN; + } + + *len = min_t(u32, page_data->length, + NSIM_MODULE_EEPROM_PAGE_LEN - offset); + return ns->ethtool.module.pages[page] + offset; +} + +static int +nsim_get_module_eeprom_by_page(struct net_device *dev, + const struct ethtool_module_eeprom *page_data, + struct netlink_ext_ack *extack) +{ + struct netdevsim *ns = netdev_priv(dev); + u32 len; + u8 *ptr; + + if (ns->ethtool.module.get_err) + return -ns->ethtool.module.get_err; + + ptr = nsim_module_eeprom_ptr(ns, page_data, &len); + if (!ptr) + return -EINVAL; + + memcpy(page_data->data, ptr, len); + + return len; +} + +static int +nsim_set_module_eeprom_by_page(struct net_device *dev, + const struct ethtool_module_eeprom *page_data, + struct netlink_ext_ack *extack) +{ + struct netdevsim *ns = netdev_priv(dev); + u32 len; + u8 *ptr; + + if (ns->ethtool.module.set_err) + return -ns->ethtool.module.set_err; + + ptr = nsim_module_eeprom_ptr(ns, page_data, &len); + if (!ptr) + return -EINVAL; + + memcpy(ptr, page_data->data, len); + + return 0; +} + static int nsim_get_ts_info(struct net_device *dev, struct kernel_ethtool_ts_info *info) { @@ -274,6 +336,8 @@ static const struct ethtool_ops nsim_ethtool_ops = { .set_fecparam = nsim_set_fecparam, .get_fec_stats = nsim_get_fec_stats, .get_ts_info = nsim_get_ts_info, + .get_module_eeprom_by_page = nsim_get_module_eeprom_by_page, + .set_module_eeprom_by_page = nsim_set_module_eeprom_by_page, .get_loopback = nsim_get_loopback, .get_loopback_by_index = nsim_get_loopback_by_index, .set_loopback = nsim_set_loopback, @@ -292,6 +356,7 @@ static void nsim_ethtool_ring_init(struct netdevsim *ns) void nsim_ethtool_init(struct netdevsim *ns) { struct dentry *ethtool, *dir; + int i; ns->netdev->ethtool_ops = &nsim_ethtool_ops; @@ -326,6 +391,24 @@ void nsim_ethtool_init(struct netdevsim *ns) debugfs_create_u32("tx_max_pending", 0600, dir, &ns->ethtool.ring.tx_max_pending); + dir = debugfs_create_dir("module", ethtool); + debugfs_create_u32("get_err", 0600, dir, &ns->ethtool.module.get_err); + debugfs_create_u32("set_err", 0600, dir, &ns->ethtool.module.set_err); + + dir = debugfs_create_dir("pages", dir); + for (i = 0; i < NSIM_MODULE_EEPROM_PAGES; i++) { + char name[8]; + + ns->ethtool.module.page_blobs[i].data = + ns->ethtool.module.pages[i]; + ns->ethtool.module.page_blobs[i].size = + NSIM_MODULE_EEPROM_PAGE_LEN; + + snprintf(name, sizeof(name), "%u", i); + debugfs_create_blob(name, 0600, dir, + &ns->ethtool.module.page_blobs[i]); + } + ns->ethtool.mac_lb.supported = ETHTOOL_LOOPBACK_DIRECTION_LOCAL | ETHTOOL_LOOPBACK_DIRECTION_REMOTE; diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index 7a3382562287..816e8ddd2551 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -82,6 +82,16 @@ struct nsim_ethtool_pauseparam { bool report_stats_tx; }; +#define NSIM_MODULE_EEPROM_PAGES 256 +#define NSIM_MODULE_EEPROM_PAGE_LEN 128 + +struct nsim_ethtool_module { + u32 get_err; + u32 set_err; + u8 pages[NSIM_MODULE_EEPROM_PAGES][NSIM_MODULE_EEPROM_PAGE_LEN]; + struct debugfs_blob_wrapper page_blobs[NSIM_MODULE_EEPROM_PAGES]; +}; + struct nsim_ethtool { u32 get_err; u32 set_err; @@ -94,6 +104,7 @@ struct nsim_ethtool { u32 supported; u32 direction; } mac_lb; + struct nsim_ethtool_module module; }; struct nsim_rq { -- 2.53.0