From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f200.google.com (mail-dy1-f200.google.com [74.125.82.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C2F534C0409 for ; Mon, 12 Oct 2026 17:43:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791826992; cv=none; b=l5Hj6NrPiSIqYWvS4txuMR6nQrQXD+eqhfXRWSbECw7GLQ/30KDeynZtTrZDbDBMDTf/E0WRO/oiPb99b5UD9ASlH4mP1Se8nsXkUpvw4RrhFwqSAV2mo7bXURRoMJo1klCLaEaFXGeNaF56YxJ2EGLz4W8r9iaek5tiNIZLQsA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791826992; c=relaxed/simple; bh=j1TaTyk/OTL5zdMp08SYdA2Dlge6Yv09Zs+4VMdCb4A=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=d/3zZY2xVtGP0cHAnkeARbK31RDxwxkgFjGHtawLdhAghdC4mp+GqnUVR0dDNamFM+SAjJpiDy+QxwZEIm2VVWbI5PXzyQGPmBOR5RiDJTZgeg23D2Uab69ruwfBKejhffzvUHpaV5xr9ega3PDrBt9v2+yeC2dbsKYxAlwu04o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=giA0fnnI; arc=none smtp.client-ip=74.125.82.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="giA0fnnI" Received: by mail-dy1-f200.google.com with SMTP id 5a478bee46e88-33713e5e6daso3440138eec.0 for ; Mon, 12 Oct 2026 10:43:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1791826988; x=1792431788; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=CnXvDkHRygIjqcgALHUWN066KUbjGPQJV9Mzd8woTCg=; b=giA0fnnIREhBMCOyncwFKlJOTtwEC9sFXMd35Ms7dIt9IrXK/6xOGLd3tMjpDQBH6t 2XVy7MRtlbG5QhallJV2lk7zeeCHh1+Dy41Ya0vNyzFWfIX8T9r9Cltz+jLi/sCL+Kta HLesRwloDU5VGIPPURHbMfQoEtKrPkrZrMcjeTrl1FH1lfdUhW3OaUjbFEEeIu8fXJF0 LISkWY96h8ouDnDBYruG0cofgf5sEnco3RAndMtMCPBzlbUut0bYt2qMVdJvxPNdsONA 2zmxFIIG9BjpKNZiNSFqHZ9s+UvisoCCcjce+fv9COVdzcmZf4WxnmkCsbQ9t7pWaRJ3 0bDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791826988; x=1792431788; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=CnXvDkHRygIjqcgALHUWN066KUbjGPQJV9Mzd8woTCg=; b=BcVUdoH7VcQJgS7ACo3XktP7OQ++CIZgyRRoEKWivCq0HY4YDxTZSd8D9hGyVWBv2s GWj3Fpx3No+YwP1ycOHvHFW0g0FzYbCupT5j1wExOv7eokiSHNFXER+7awm1+UEtSJPY IdSOUU42dfZZ9tF5uBGYeQ8znFpnWvuKu3xX/3SJq0vgJBRl093Q/Ive2XZPb7oBLrR/ 3Z+P9qGJ3VrIPBg47uGCWY34b/r5sRyFhqn7M5yviSfeg0V1GzVkjdsgDdJO/uES9dvs 13mMG4TJzsgGBfOu+Iok2E5m5zOVUR9GhfBCBwcCPyZEhRwXv+j1Mm2fH2teFCFRF5hY 9sDg== X-Forwarded-Encrypted: i=1; AKwUvBwuj1VBSUv1y3swxYe8Tw7tVXc+9a4a4+fdSSRTo/xYu2nplZzwIb+wT5G7y9FK6ReOA3cGFYlb+HMDA7k=@vger.kernel.org X-Gm-Message-State: AFq9FYKAPLWDSzFSBwE7U010qEKTZ+jqXl0GirmlcDdI1/P1o+CPHtvc TOLIEunT/Dq9IV1wrBJgZSAmSi0mvw952gZYvNjPSiLhg3eUPq69EGZdV/53GILayD4gZBO6zxD ps8PFkfRwg/zY6ok1asuqXh1arQ== X-Received: from dlbtu4.prod.google.com ([2002:a05:7022:3c04:b0:157:8b19:354f]) (user=almasrymina job=prod-delivery.src-stubby-dispatcher) by 2002:a05:701b:4508:10b0:154:fa0b:6df1 with SMTP id a92af1059eb24-16a5e49d6c9mr12641181c88.37.1791826987357; Mon, 12 Oct 2026 10:43:07 -0700 (PDT) Date: Mon, 12 Oct 2026 17:42:59 +0000 In-Reply-To: <20261012174300.2338784-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20261012174300.2338784-1-almasrymina@google.com> X-Mailer: git-send-email 2.56.0.385.gd3acb90ef8-goog Message-ID: <20261012174300.2338784-4-almasrymina@google.com> Subject: [PATCH net v2 3/4] netdevsim: support devmem RX and TX bindings From: Mina Almasry To: Jakub Kicinski , David Wei , Pavel Begunkov , Mina Almasry , Taehee Yoo , Stanislav Fomichev , Paolo Abeni , Kaiyuan Zhang , Bobby Eshleman , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Andrew Lunn , "David S. Miller" , Eric Dumazet , Simon Horman , Shuah Khan , Sumit Semwal , "=?UTF-8?q?Christian=20K=C3=B6nig?=" , Nikolay Aleksandrov , Daniel Borkmann , Tariq Toukan , Kaifeng Wang Content-Type: text/plain; charset="UTF-8" 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_DMA_MAP | PP_FLAG_DMA_SYNC_DEV | PP_FLAG_ALLOW_UNREADABLE_NETMEM and queue_idx so devmem bind-rx and bind-tx netlink operations can be tested against netdevsim in software selftests. Cc: Tariq Toukan Cc: Kaifeng Wang Signed-off-by: Mina Almasry --- drivers/net/netdevsim/bus.c | 1 + drivers/net/netdevsim/netdev.c | 21 +++++++++++++++------ 2 files changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c index 5c55c308487b4..f87f5e037b6fb 100644 --- a/drivers/net/netdevsim/bus.c +++ b/drivers/net/netdevsim/bus.c @@ -462,6 +462,7 @@ nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queu nsim_bus_dev->port_count = port_count; nsim_bus_dev->num_queues = num_queues; nsim_bus_dev->initial_net = current->nsproxy->net_ns; + dma_coerce_mask_and_coherent(&nsim_bus_dev->dev, DMA_BIT_MASK(64)); /* Disallow using nsim_bus_dev */ smp_store_release(&nsim_bus_dev->init, false); diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index b4a99f3ceac60..4415dc01c610b 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -414,16 +414,22 @@ static int nsim_poll(struct napi_struct *napi, int budget) return done; } -static int nsim_create_page_pool(struct page_pool **p, struct napi_struct *napi) +static int nsim_create_page_pool(struct net_device *dev, struct page_pool **p, + struct napi_struct *napi, int idx) { + struct netdevsim *ns = netdev_priv(dev); struct page_pool_params params = { .order = 0, .pool_size = NSIM_RING_SIZE, + .flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV | + PP_FLAG_ALLOW_UNREADABLE_NETMEM, + .max_len = PAGE_SIZE, .nid = NUMA_NO_NODE, - .dev = &napi->dev->dev, + .dev = &ns->nsim_bus_dev->dev, .napi = napi, .dma_dir = DMA_BIDIRECTIONAL, - .netdev = napi->dev, + .netdev = dev, + .queue_idx = idx, }; struct page_pool *pool; @@ -450,7 +456,7 @@ static int nsim_init_napi(struct netdevsim *ns) for (i = 0; i < dev->num_rx_queues; i++) { rq = ns->rq[i]; - err = nsim_create_page_pool(&rq->page_pool, &rq->napi); + err = nsim_create_page_pool(dev, &rq->page_pool, &rq->napi, i); if (err) goto err_pp_destroy; } @@ -762,14 +768,16 @@ nsim_queue_mem_alloc(struct net_device *dev, if (ns->rq_reset_mode == 1) { if (!netif_running(ns->netdev)) return -ENETDOWN; - return nsim_create_page_pool(&qmem->pp, &ns->rq[idx]->napi); + return nsim_create_page_pool(dev, &qmem->pp, + &ns->rq[idx]->napi, idx); } qmem->rq = nsim_queue_alloc(); if (!qmem->rq) return -ENOMEM; - err = nsim_create_page_pool(&qmem->rq->page_pool, &qmem->rq->napi); + err = nsim_create_page_pool(dev, &qmem->rq->page_pool, &qmem->rq->napi, + idx); if (err) goto err_free; @@ -1051,6 +1059,7 @@ static int nsim_init_netdevsim(struct netdevsim *ns) ns->netdev->netdev_ops = &nsim_netdev_ops; ns->netdev->stat_ops = &nsim_stat_ops; ns->netdev->queue_mgmt_ops = &nsim_queue_mgmt_ops; + ns->netdev->netmem_tx = NETMEM_TX_DMA; netdev_lockdep_set_classes(ns->netdev); err = nsim_udp_tunnels_info_create(ns->nsim_dev, ns->netdev); -- 2.56.0.385.gd3acb90ef8-goog