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 2E743145348 for ; Wed, 16 Jul 2025 00:04:18 +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=1752624259; cv=none; b=kluJrxl1q6BHa26ff/4mkcfKry5u8Vlqc7rb499PIzRQXOXg7Q29SrAvF2trfV2RDrjG6m2Qz6mViXuaC3sxyqsRBwqPuVh1T6lbr/e413V1y9PYEvZGYdPVCc1uZOaNvVz8AsWIVu/Lwzf/CrntNtk6WCD8giexba6F85O/Eog= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752624259; c=relaxed/simple; bh=BkLJf8rmZVA73k/nXlvLspSUqAv5F97YYjqdJX1X9Y0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sfvakdLOlbxOBrlIa75PwWkbT6V9zyG86gEpyFpB6REstYyUsDbl0f824FXU4mJVPb7n9s5OJfkvwZKW5aa+TuFC/uNR6DtIo/tioDVpJBOwpZacTNXNDT3lRYR1Rk8rNrMFBSISivsyM6ILdYcCPG8c4RUAnaSZQxa4FNwjjvs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VtIW1F5h; 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="VtIW1F5h" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 12789C4CEF8; Wed, 16 Jul 2025 00:04:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752624258; bh=BkLJf8rmZVA73k/nXlvLspSUqAv5F97YYjqdJX1X9Y0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VtIW1F5hMNeryNTchSYhOYRzlALYy/+NSF5UY2QcXUpNaH4V0Jf9RdC0ud7wfOBTs 2yC8grJtfQc+/DZd4WUh1y1McmPPsJu5TMqmNyoI8PZWUjT3DgoOA0FBzGENZMeeu9 MOpRpqJ/umJyLkIq2kCGQ5/JULNDVngIY0JFY3Bld+AvRyN1xDG0tgdtEczTnvJcJ/ WzlJJpGb/xdZrqtjk1qbL88JGYE+yWhXriFsoEkJlAGgYvwSyhwV8/VilydofiGZzd esRY1ZCS/b3ez49mApA7FBvC/wD+rHpyOt1OVr5ab1RrQZw5thitmK1008tV2Cq67V zq191iG+WDsKQ== From: Jakub Kicinski To: davem@davemloft.net Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, donald.hunter@gmail.com, shuah@kernel.org, kory.maincent@bootlin.com, maxime.chevallier@bootlin.com, sdf@fomichev.me, ecree.xilinx@gmail.com, gal@nvidia.com, jdamato@fastly.com, andrew@lunn.ch, Jakub Kicinski Subject: [PATCH net-next v3 06/11] ethtool: rss: support setting hkey via Netlink Date: Tue, 15 Jul 2025 17:03:26 -0700 Message-ID: <20250716000331.1378807-7-kuba@kernel.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250716000331.1378807-1-kuba@kernel.org> References: <20250716000331.1378807-1-kuba@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Support setting RSS hashing key via ethtool Netlink. Use the Netlink policy to make sure user doesn't pass an empty key, "resetting" the key is not a thing. Reviewed-by: Gal Pressman Signed-off-by: Jakub Kicinski --- v2: - use ethnl_update_binary() - make sure we free indir if key parsing fails --- Documentation/netlink/specs/ethtool.yaml | 1 + Documentation/networking/ethtool-netlink.rst | 1 + net/ethtool/rss.c | 41 +++++++++++++++++++- 3 files changed, 42 insertions(+), 1 deletion(-) diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml index 0d02d8342e4c..aa55fc9068e1 100644 --- a/Documentation/netlink/specs/ethtool.yaml +++ b/Documentation/netlink/specs/ethtool.yaml @@ -2656,6 +2656,7 @@ c-version-name: ethtool-genl-version - context - hfunc - indir + - hkey - name: rss-ntf doc: | diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index f6e4439caa94..1830354495ae 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -2001,6 +2001,7 @@ RSS_SET ``ETHTOOL_A_RSS_CONTEXT`` u32 context number ``ETHTOOL_A_RSS_HFUNC`` u32 RSS hash func ``ETHTOOL_A_RSS_INDIR`` binary Indir table bytes + ``ETHTOOL_A_RSS_HKEY`` binary Hash key bytes ===================================== ====== ============================== ``ETHTOOL_A_RSS_INDIR`` is the minimal RSS table the user expects. Kernel and diff --git a/net/ethtool/rss.c b/net/ethtool/rss.c index bc9025cfcf1c..55260830639f 100644 --- a/net/ethtool/rss.c +++ b/net/ethtool/rss.c @@ -477,6 +477,7 @@ const struct nla_policy ethnl_rss_set_policy[ETHTOOL_A_RSS_START_CONTEXT + 1] = [ETHTOOL_A_RSS_CONTEXT] = { .type = NLA_U32, }, [ETHTOOL_A_RSS_HFUNC] = NLA_POLICY_MIN(NLA_U32, 1), [ETHTOOL_A_RSS_INDIR] = { .type = NLA_BINARY, }, + [ETHTOOL_A_RSS_HKEY] = NLA_POLICY_MIN(NLA_BINARY, 1), }; static int @@ -490,8 +491,10 @@ ethnl_rss_set_validate(struct ethnl_req_info *req_info, struct genl_info *info) if (request->rss_context && !ops->create_rxfh_context) bad_attr = bad_attr ?: tb[ETHTOOL_A_RSS_CONTEXT]; - if (request->rss_context && !ops->rxfh_per_ctx_key) + if (request->rss_context && !ops->rxfh_per_ctx_key) { bad_attr = bad_attr ?: tb[ETHTOOL_A_RSS_HFUNC]; + bad_attr = bad_attr ?: tb[ETHTOOL_A_RSS_HKEY]; + } if (bad_attr) { NL_SET_BAD_ATTR(info->extack, bad_attr); @@ -581,6 +584,31 @@ rss_set_prep_indir(struct net_device *dev, struct genl_info *info, return err; } +static int +rss_set_prep_hkey(struct net_device *dev, struct genl_info *info, + struct rss_reply_data *data, struct ethtool_rxfh_param *rxfh, + bool *mod) +{ + struct nlattr **tb = info->attrs; + + if (!tb[ETHTOOL_A_RSS_HKEY]) + return 0; + + if (nla_len(tb[ETHTOOL_A_RSS_HKEY]) != data->hkey_size) { + NL_SET_BAD_ATTR(info->extack, tb[ETHTOOL_A_RSS_HKEY]); + return -EINVAL; + } + + rxfh->key_size = data->hkey_size; + rxfh->key = kmemdup(data->hkey, data->hkey_size, GFP_KERNEL); + if (!rxfh->key) + return -ENOMEM; + + ethnl_update_binary(rxfh->key, rxfh->key_size, tb[ETHTOOL_A_RSS_HKEY], + mod); + return 0; +} + static void rss_set_ctx_update(struct ethtool_rxfh_context *ctx, struct nlattr **tb, struct rss_reply_data *data, struct ethtool_rxfh_param *rxfh) @@ -592,6 +620,11 @@ rss_set_ctx_update(struct ethtool_rxfh_context *ctx, struct nlattr **tb, ethtool_rxfh_context_indir(ctx)[i] = rxfh->indir[i]; ctx->indir_configured = !!nla_len(tb[ETHTOOL_A_RSS_INDIR]); } + if (rxfh->key) { + memcpy(ethtool_rxfh_context_key(ctx), rxfh->key, + data->hkey_size); + ctx->key_configured = !!rxfh->key_size; + } if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE) ctx->hfunc = rxfh->hfunc; } @@ -629,6 +662,10 @@ ethnl_rss_set(struct ethnl_req_info *req_info, struct genl_info *info) if (rxfh.hfunc == data.hfunc) rxfh.hfunc = ETH_RSS_HASH_NO_CHANGE; + ret = rss_set_prep_hkey(dev, info, &data, &rxfh, &mod); + if (ret) + goto exit_free_indir; + rxfh.input_xfrm = RXH_XFRM_NO_CHANGE; mutex_lock(&dev->ethtool->rss_lock); @@ -660,6 +697,8 @@ ethnl_rss_set(struct ethnl_req_info *req_info, struct genl_info *info) exit_unlock: mutex_unlock(&dev->ethtool->rss_lock); + kfree(rxfh.key); +exit_free_indir: kfree(rxfh.indir); exit_clean_data: rss_cleanup_data(&data.base); -- 2.50.1