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Miller" , Eric Dumazet , Jesper Dangaard Brouer , Ilias Apalodimas , Simon Horman , Shuah Khan , Sumit Semwal , Christian =?utf-8?B?S8O2bmln?= , Dragos Tatulea , Nikolay Aleksandrov , Daniel Borkmann , Tariq Toukan , Kaifeng Wang Subject: Re: [PATCH net v4 3/4] netdevsim: support devmem RX and TX bindings Message-ID: References: <20261015163915.1166043-1-almasrymina@google.com> <20261015163915.1166043-4-almasrymina@google.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20261015163915.1166043-4-almasrymina@google.com> On 10/15, Mina Almasry wrote: > Set a 64-bit DMA mask on nsim_bus_dev, enable NETMEM_TX_DMA on the > netdevsim net_device, and configure page_pool instances with > PP_FLAG_ALLOW_UNREADABLE_NETMEM and queue_idx, plus PP_FLAG_DMA_MAP | > PP_FLAG_DMA_SYNC_DEV when CONFIG_HAS_DMA is set, so devmem bind-rx and > bind-tx netlink operations can be tested against netdevsim in software > selftests. > > The pp_hold debugfs file allocates pages from the queue 0 page pool, so > refuse it when that pool is backed by a memory provider, and take the > netdev instance lock there so a concurrent bind-rx cannot swap the pool > in between. The software PSP path checksums the payload when the peer > does not decapsulate, so drop unreadable skbs there. > > Cc: Tariq Toukan > Cc: Kaifeng Wang > Assisted-by: LLM > Signed-off-by: Mina Almasry > Reviewed-by: Dragos Tatulea Acked-by: Stanislav Fomichev