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([2a0d:3344:5521:6b10:58fd:68f:7756:389d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47aa0f2186bsm31669370f8f.36.2026.07.07.01.45.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jul 2026 01:45:26 -0700 (PDT) Message-ID: Date: Tue, 7 Jul 2026 10:45:25 +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 v2 0/1] net: rnpgbe: fix mailbox endianness To: Dong Yibo , andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, vadim.fedorenko@linux.dev Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, yaojun@mucse.com References: <20260701032208.1843156-1-dong100@mucse.com> From: Paolo Abeni Content-Language: en-US In-Reply-To: <20260701032208.1843156-1-dong100@mucse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 7/1/26 5:22 AM, Dong Yibo wrote: > The rnpgbe mailbox exchanges data through 32-bit MMIO registers in > little-endian wire format. The original code had two problems: > > 1. FW structs with __le16/__le32 fields were cast to (u32 *) before > reaching the transport, hiding the endian annotations from sparse. > > 2. No cpu_to_le32()/le32_to_cpu() conversion was performed between > the CPU-endian MMIO values and the little-endian payload, causing > data corruption on big-endian systems. > > v2 fixes this by introducing union wrappers around the FW structs > and adding the missing byte-order conversions in the transport layer. > All pointer casts on the mailbox data path are eliminated. > > Changelog: > v1 -> v2: > - Remove all pointer casts on the mailbox data path. Use union > wrappers (mbx_fw_cmd_req_u, mbx_fw_cmd_reply_u) that overlay > each FW struct with a __le32 dwords[] array. Callers fill > named fields with cpu_to_le16/32() and pass dwords[] directly > to the transport — no casts needed. > - Change transport signatures from u32 */void * to explicit > __le32 * so sparse can verify endian correctness. > - Add comments in mucse_read_mbx_pf() and mucse_write_mbx_pf() > explaining why memcpy_toio() cannot replace the readl()/writel() > loop (the mailbox uses 32-bit MMIO registers, not byte- > addressable RAM). > > links: > --- > v1: https://lore.kernel.org/netdev/20260617083531.251119-1-dong100@mucse.com/ A few process notes: - this is 'net' material, I'm applying the patch there - no needed for a cover letter for a one-patch series /P