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[146.241.44.112]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-381edc1104asm15134228f8f.88.2024.11.12.01.17.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 Nov 2024 01:17:41 -0800 (PST) Message-ID: <719083c2-e277-447b-b6ea-ca3acb293a03@redhat.com> Date: Tue, 12 Nov 2024 10:17:40 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [net-next v6 6/9] netdev-genl: Support setting per-NAPI config values To: Joe Damato , netdev@vger.kernel.org Cc: mkarsten@uwaterloo.ca, skhawaja@google.com, sdf@fomichev.me, bjorn@rivosinc.com, amritha.nambiar@intel.com, sridhar.samudrala@intel.com, willemdebruijn.kernel@gmail.com, edumazet@google.com, Jakub Kicinski , Donald Hunter , "David S. Miller" , Jesper Dangaard Brouer , Mina Almasry , Xuan Zhuo , open list References: <20241011184527.16393-1-jdamato@fastly.com> <20241011184527.16393-7-jdamato@fastly.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20241011184527.16393-7-jdamato@fastly.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/11/24 20:45, Joe Damato wrote: > +int netdev_nl_napi_set_doit(struct sk_buff *skb, struct genl_info *info) > +{ > + struct napi_struct *napi; > + unsigned int napi_id; > + int err; > + > + if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID)) > + return -EINVAL; > + > + napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_ID]); > + > + rtnl_lock(); > + > + napi = napi_by_id(napi_id); AFAICS the above causes a RCU splat in the selftests: https://netdev-3.bots.linux.dev/vmksft-net-dbg/results/856342/61-busy-poll-test-sh/stderr because napi_by_id() only checks for the RCU lock. Could you please have a look? Thanks! Paolo