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([2620:10d:c091:500::5:8f1b]) by smtp.gmail.com with ESMTPSA id af79cd13be357-89c11698b74sm171117185a.30.2025.10.23.07.34.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 23 Oct 2025 07:34:16 -0700 (PDT) Message-ID: Date: Thu, 23 Oct 2025 10:34:15 -0400 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] net/mlx5: Implement swp_l4_csum_mode via devlink params To: Jiri Pirko Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Saeed Mahameed , Tariq Toukan , Simon Horman , Jonathan Corbet , Leon Romanovsky , Mark Bloch , Andrew Lunn , Vlad Dumitrescu , netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org References: <20251022190932.1073898-1-daniel.zahka@gmail.com> Content-Language: en-US From: Daniel Zahka In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 10/23/25 8:18 AM, Jiri Pirko wrote: > Wed, Oct 22, 2025 at 09:09:31PM +0200, daniel.zahka@gmail.com wrote: >> swp_l4_csum_mode controls how L4 transmit checksums are computed when >> using Software Parser (SWP) hints for header locations. >> >> Supported values: >> 1. device_default: use device default setting. > Is this different between devices/fw_versions? That is what I presume. I believe the current setting for swp_l4_csum_mode is ultimately encoded in the capabilities advertised to the driver during initialization. For example, I am mostly interested in mlx5e_psp_init(), which depends on:     if (!MLX5_CAP_ETH(mdev, swp_csum_l4_partial)) {         mlx5_core_dbg(mdev, "SWP L4 partial checksum not supported\n");         return 0;     } My guess is that "device_default" means that this bit would depend on the device/fw_version.