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charset=us-ascii Content-Disposition: inline In-Reply-To: <20250305141938.319282-2-maxime.chevallier@bootlin.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250307_042126_915759_261A51F8 X-CRM114-Status: GOOD ( 26.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Mar 05, 2025 at 03:19:31PM +0100, Maxime Chevallier wrote: > We have a number of netlink commands in the ethnl family that may have > multiple objects to dump even for a single net_device, including : > > - PLCA, PSE-PD, phy: one message per PHY device > - tsinfo: one message per timestamp source (netdev + phys) > - rss: One per RSS context > > To get this behaviour, these netlink commands need to roll a custom > ->dumpit(). > > To prepare making per-netdev DUMP more generic in ethnl, introduce a > member in the ethnl ops to indicate if a given command may allow > pernetdev DUMPs (also referred to as filtered DUMPs). > > Signed-off-by: Maxime Chevallier > --- > net/ethtool/netlink.c | 45 ++++++++++++++++++++++++++++--------------- > net/ethtool/netlink.h | 1 + > 2 files changed, 30 insertions(+), 16 deletions(-) > > diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c > index 734849a57369..0815b28ba32f 100644 > --- a/net/ethtool/netlink.c > +++ b/net/ethtool/netlink.c > @@ -578,21 +578,34 @@ static int ethnl_default_dumpit(struct sk_buff *skb, > int ret = 0; > > rcu_read_lock(); > - for_each_netdev_dump(net, dev, ctx->pos_ifindex) { > - dev_hold(dev); > + if (ctx->req_info->dev) { > + dev = ctx->req_info->dev; > rcu_read_unlock(); > - > - ret = ethnl_default_dump_one(skb, dev, ctx, genl_info_dump(cb)); > - > + /* Filtered DUMP request targeted to a single netdev. We already > + * hold a ref to the netdev from ->start() > + */ > + ret = ethnl_default_dump_one_dev(skb, dev, ctx, > + genl_info_dump(cb)); Hi Maxime, ethnl_default_dump_one_dev() is called here but it doesn't exist until the following patch is applied, which breaks bisection. > rcu_read_lock(); > - dev_put(dev); > - > - if (ret < 0 && ret != -EOPNOTSUPP) { > - if (likely(skb->len)) > - ret = skb->len; > - break; > + netdev_put(ctx->req_info->dev, &ctx->req_info->dev_tracker); > + } else { > + for_each_netdev_dump(net, dev, ctx->pos_ifindex) { > + dev_hold(dev); > + rcu_read_unlock(); > + > + ret = ethnl_default_dump_one(skb, dev, ctx, > + genl_info_dump(cb)); > + > + rcu_read_lock(); > + dev_put(dev); > + > + if (ret < 0 && ret != -EOPNOTSUPP) { > + if (likely(skb->len)) > + ret = skb->len; > + break; > + } > + ret = 0; > } > - ret = 0; > } > rcu_read_unlock(); > ... > diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h > index ec6ab5443a6f..4db27182741f 100644 > --- a/net/ethtool/netlink.h > +++ b/net/ethtool/netlink.h > @@ -388,6 +388,7 @@ struct ethnl_request_ops { > unsigned int req_info_size; > unsigned int reply_data_size; > bool allow_nodev_do; > + bool allow_pernetdev_dump; nit: allow_pernetdev_dump should also be added to the Kernel doc for struct ethnl_request_ops Flagged by ./scripts/kernel-doc -none There also appear to be similar minor issues with subsequent patches in this series. > u8 set_ntf_cmd; > > int (*parse_request)(struct ethnl_req_info *req_info, > -- > 2.48.1 >