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Thu, 07 May 2026 06:21:45 -0700 (PDT) Received: from [192.168.88.32] ([150.228.93.82]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e59b74277sm82568905e9.3.2026.05.07.06.21.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 07 May 2026 06:21:44 -0700 (PDT) Message-ID: <4e9b5728-1a8b-466b-900a-935e5647a623@redhat.com> Date: Thu, 7 May 2026 15:21:42 +0200 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: [PATCH net-next v5 3/5] veth: implement Byte Queue Limits (BQL) for latency reduction To: Simon Schippers , hawk@kernel.org, netdev@vger.kernel.org Cc: kernel-team@cloudflare.com, Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Stanislav Fomichev , linux-kernel@vger.kernel.org, bpf@vger.kernel.org References: <20260505132159.241305-1-hawk@kernel.org> <20260505132159.241305-4-hawk@kernel.org> Content-Language: en-US From: Paolo Abeni In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 5/7/26 8:54 AM, Simon Schippers wrote: >> @@ -928,9 +968,13 @@ static int veth_xdp_rcv(struct veth_rq *rq, int budget, >> } >> } else { >> /* ndo_start_xmit */ >> - struct sk_buff *skb = ptr; >> + bool bql_charged = veth_ptr_is_bql(ptr); >> + struct sk_buff *skb = veth_ptr_to_skb(ptr); >> >> stats->xdp_bytes += skb->len; >> + if (peer_txq && bql_charged) >> + netdev_tx_completed_queue(peer_txq, 1, VETH_BQL_UNIT); > > In the discussion with Jonas [1], I left a comment explaining why I think > this doesn’t work. > > I still think first that adding an option to modify the hard-coded > VETH_RING_SIZE is the way to go. Isn't the veth_poll() (towards the end of the function) a more natural place to issue completion events? /P