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Thu, 05 Nov 2026 14:21:03 -0800 (PST) Received: from localhost ([2a03:2880:9ff:42::]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36fa9aea414sm47741eec.16.2026.11.05.14.21.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 14:21:03 -0800 (PST) From: Stanislav Fomichev X-Google-Original-From: Stanislav Fomichev To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, andrew+netdev@lunn.ch, edumazet@kernel.org, horms@kernel.org, corbet@lwn.net, skhan@linuxfoundation.org, rdunlap@infradead.org, michael.chan@broadcom.com, pavan.chebbi@broadcom.com, saeedm@nvidia.com, tariqt@nvidia.com, mbloch@nvidia.com, alexanderduyck@fb.com, kernel-team@meta.com, sdf@fomichev.me, dimitri.daskalakis1@gmail.com, almasrymina@google.com, dtatulea@nvidia.com, bobbyeshleman@meta.com, asml.silence@gmail.com, daniel@iogearbox.net, razor@blackwall.org, leitao@debian.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kselftest@vger.kernel.org, leon@kernel.org Subject: [PATCH net-next v3 3/9] net: devmem: use niov_shift in net_devmem_get_niov_at() Date: Thu, 5 Nov 2026 14:20:52 -0800 Message-ID: <20261105222058.944293-4-sdf@fomichev.me> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261105222058.944293-1-sdf@fomichev.me> References: <20261105222058.944293-1-sdf@fomichev.me> X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit TX bindings use PAGE_SIZE net_iovs, and the TX lookup hard-codes it. Derive the index and offset from binding->niov_shift instead, so TX bindings can use larger net_iovs. No functional change, TX bindings are still created with PAGE_SHIFT. Signed-off-by: Stanislav Fomichev Reviewed-by: Mina Almasry Reviewed-by: Dragos Tatulea --- net/core/devmem.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/net/core/devmem.c b/net/core/devmem.c index 32fafbfa1359..6339f221bc82 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -455,13 +455,15 @@ struct net_iov * net_devmem_get_niov_at(struct net_devmem_dmabuf_binding *binding, size_t virt_addr, size_t *off, size_t *size) { + size_t niov_size = 1UL << binding->niov_shift; + if (virt_addr >= binding->dmabuf->size) return NULL; - *off = virt_addr % PAGE_SIZE; - *size = PAGE_SIZE - *off; + *off = virt_addr & (niov_size - 1); + *size = niov_size - *off; - return binding->tx_vec[virt_addr / PAGE_SIZE]; + return binding->tx_vec[virt_addr >> binding->niov_shift]; } /*** "Dmabuf devmem memory provider" ***/ -- 2.53.0-Meta