From patchwork Fri Feb 14 15:34:32 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislav Fomichev X-Patchwork-Id: 13975126 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-pl1-f171.google.com (mail-pl1-f171.google.com [209.85.214.171]) (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 C8FE42673A4 for ; Fri, 14 Feb 2025 15:34:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739547288; cv=none; b=YwNXufmG9BdNYVMkFs4pxRc3pklLnS9tjjqukKKLYjf1UlDE54tsLyWHZn5LnwGptGx+sD/vLsAWlbjJIU5xlHXeicqy6sPd34w5v8m+tq2Z7b6Vd2a0PojHZOMh7PxP1SAzMdFi8y3Yj8ZH9K585e2Ux34D7swuoQmAtxrknPA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739547288; c=relaxed/simple; bh=Rusdcro/kLkh+MbP/d61H0D1lPDQbBsqlsOhTzg59J4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sSzFPgiTdLaCFqb7AjhSFj2PRlBtRJrJFsoY6nEVgevDYVvJwixzZlr6TYdiXKrTi301GA6Oj/R8ygLnyliUVaS/2zYvNs4bObA1iLwjjwOpm2zrEYFDBkhg+C8+k/rg+4GKTCm0OZaBcKEOaS09+W/7V78SGp/AYlfJEmFgjQQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fomichev.me; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.214.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fomichev.me Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pl1-f171.google.com with SMTP id d9443c01a7336-21f818a980cso35652185ad.3 for ; Fri, 14 Feb 2025 07:34:46 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1739547286; x=1740152086; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=FQCxsr2hX379kFamothT94OivfD4Swd2Wr1GC9ukABg=; b=t7whm4s/toYTfkJ1YkXi0ji05CtZKDiw1i3nLxEcZugI/ABScHeVeincGpq0B9T5cT meMJcFJf6SoSJzYu6FGffZNTTjFF/v0orsGhb4vxql3NIIqsk4hhUkoadxYZ2oEAOxND giFJF0YXUKtxkqMK505AJTfulnLildVgeWxqdnGdlq5ajNLrPy7kPVmffUsbhvi+dD93 4IFMUHLiszt4/fq+pi+iJAgN0hQ+cEq6Uh5jx1ASY+nH4NwQ4jIumpXB1oiQucqatvIe v2HSRv+RlXMSydm16wcEYomOuIsdln4x3LNPjHxvfRhwyUntYRjtSCpxZhpxnWKQ0QWt zUTQ== X-Gm-Message-State: AOJu0Yy/a6Bh0btUvAToSV+INovNYVWtoeSvrmt6wSTXRG13vtGGgRX3 B2tRP1SajazF86HAPtfSb+rxnbq8p/HiRqGzSKxwiyvqec7ZKbaX2b3r X-Gm-Gg: ASbGncu0heaZv9ICu/8/TrsfVm4tBdrJk7leIu2iHaTl3E62cXkUCVQcBN8OL2F5Wm5 X67S5L9yn1UhGgXv+8TvB7ILrEqP78x6kpEqwqjvhMeOemyWTwjAJ0lv1c2CT1DY6eoow6vJ8pm QKgU+NkQ9FLDPS8rSPLMqJI7g+wtuV+ak6XpHx/evWtTCXVu6UWhN3R0FIqUPSApJZ2qqvg6yR/ JNuWXiD9e2qrfyyv6y/UPnpcAfSA05witT2wV1YupbuMGp6EdIFu5AIVu/Gn+WmPo/JHY/6mmc5 vkp6U13gs8fGMyU= X-Google-Smtp-Source: AGHT+IEjBT3Fhxt1hawK6DGiOmJwn5EtGC68IxC65obApCpnT2bOXGJWQjQ5NDKK3YKqrU/0MbUvAw== X-Received: by 2002:a05:6a21:390:b0:1ee:8041:162b with SMTP id adf61e73a8af0-1ee804118efmr4844648637.21.1739547285605; Fri, 14 Feb 2025 07:34:45 -0800 (PST) Received: from localhost ([2601:646:9e00:f56e:2844:3d8f:bf3e:12cc]) by smtp.gmail.com with UTF8SMTPSA id 41be03b00d2f7-adbf21517eesm2151229a12.13.2025.02.14.07.34.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Feb 2025 07:34:45 -0800 (PST) From: Stanislav Fomichev To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, Saeed Mahameed Subject: [PATCH net-next v2 03/11] net: hold netdev instance lock during queue operations Date: Fri, 14 Feb 2025 07:34:32 -0800 Message-ID: <20250214153440.1994910-4-sdf@fomichev.me> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250214153440.1994910-1-sdf@fomichev.me> References: <20250214153440.1994910-1-sdf@fomichev.me> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org For the drivers that use queue management API, switch to the mode where core stack holds the netdev instance lock. This affects the following drivers: - bnxt - gve - netdevsim Originally I locked only start/stop, but switched to holding the lock over all iterations to make them look atomic to the device (feels like it should be easier to reason about). Cc: Saeed Mahameed Signed-off-by: Stanislav Fomichev --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 16 +++++++-------- drivers/net/ethernet/google/gve/gve_main.c | 8 ++++---- drivers/net/ethernet/google/gve/gve_utils.c | 6 +++--- drivers/net/netdevsim/netdev.c | 22 ++++++++++++--------- include/linux/netdevice.h | 2 +- net/core/netdev_rx_queue.c | 5 +++++ 6 files changed, 34 insertions(+), 25 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 7b8b5b39c7bb..227021e64ea1 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -11301,7 +11301,7 @@ static int bnxt_request_irq(struct bnxt *bp) if (rc) break; - netif_napi_set_irq(&bp->bnapi[i]->napi, irq->vector); + netif_napi_set_irq_locked(&bp->bnapi[i]->napi, irq->vector); irq->requested = 1; if (zalloc_cpumask_var(&irq->cpu_mask, GFP_KERNEL)) { @@ -11337,9 +11337,9 @@ static void bnxt_del_napi(struct bnxt *bp) for (i = 0; i < bp->cp_nr_rings; i++) { struct bnxt_napi *bnapi = bp->bnapi[i]; - __netif_napi_del(&bnapi->napi); + __netif_napi_del_locked(&bnapi->napi); } - /* We called __netif_napi_del(), we need + /* We called __netif_napi_del_locked(), we need * to respect an RCU grace period before freeing napi structures. */ synchronize_net(); @@ -11358,12 +11358,12 @@ static void bnxt_init_napi(struct bnxt *bp) cp_nr_rings--; for (i = 0; i < cp_nr_rings; i++) { bnapi = bp->bnapi[i]; - netif_napi_add_config(bp->dev, &bnapi->napi, poll_fn, - bnapi->index); + netif_napi_add_config_locked(bp->dev, &bnapi->napi, poll_fn, + bnapi->index); } if (BNXT_CHIP_TYPE_NITRO_A0(bp)) { bnapi = bp->bnapi[cp_nr_rings]; - netif_napi_add(bp->dev, &bnapi->napi, bnxt_poll_nitroa0); + netif_napi_add_locked(bp->dev, &bnapi->napi, bnxt_poll_nitroa0); } } @@ -11384,7 +11384,7 @@ static void bnxt_disable_napi(struct bnxt *bp) cpr->sw_stats->tx.tx_resets++; if (bnapi->in_reset) cpr->sw_stats->rx.rx_resets++; - napi_disable(&bnapi->napi); + napi_disable_locked(&bnapi->napi); } } @@ -11406,7 +11406,7 @@ static void bnxt_enable_napi(struct bnxt *bp) INIT_WORK(&cpr->dim.work, bnxt_dim_work); cpr->dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE; } - napi_enable(&bnapi->napi); + napi_enable_locked(&bnapi->napi); } } diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c index 533e659b15b3..cf9bd08d04b2 100644 --- a/drivers/net/ethernet/google/gve/gve_main.c +++ b/drivers/net/ethernet/google/gve/gve_main.c @@ -1886,7 +1886,7 @@ static void gve_turndown(struct gve_priv *priv) netif_queue_set_napi(priv->dev, idx, NETDEV_QUEUE_TYPE_TX, NULL); - napi_disable(&block->napi); + napi_disable_locked(&block->napi); } for (idx = 0; idx < priv->rx_cfg.num_queues; idx++) { int ntfy_idx = gve_rx_idx_to_ntfy(priv, idx); @@ -1897,7 +1897,7 @@ static void gve_turndown(struct gve_priv *priv) netif_queue_set_napi(priv->dev, idx, NETDEV_QUEUE_TYPE_RX, NULL); - napi_disable(&block->napi); + napi_disable_locked(&block->napi); } /* Stop tx queues */ @@ -1925,7 +1925,7 @@ static void gve_turnup(struct gve_priv *priv) if (!gve_tx_was_added_to_block(priv, idx)) continue; - napi_enable(&block->napi); + napi_enable_locked(&block->napi); if (idx < priv->tx_cfg.num_queues) netif_queue_set_napi(priv->dev, idx, @@ -1953,7 +1953,7 @@ static void gve_turnup(struct gve_priv *priv) if (!gve_rx_was_added_to_block(priv, idx)) continue; - napi_enable(&block->napi); + napi_enable_locked(&block->napi); netif_queue_set_napi(priv->dev, idx, NETDEV_QUEUE_TYPE_RX, &block->napi); diff --git a/drivers/net/ethernet/google/gve/gve_utils.c b/drivers/net/ethernet/google/gve/gve_utils.c index 30fef100257e..ace9b8698021 100644 --- a/drivers/net/ethernet/google/gve/gve_utils.c +++ b/drivers/net/ethernet/google/gve/gve_utils.c @@ -110,13 +110,13 @@ void gve_add_napi(struct gve_priv *priv, int ntfy_idx, { struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx]; - netif_napi_add(priv->dev, &block->napi, gve_poll); - netif_napi_set_irq(&block->napi, block->irq); + netif_napi_add_locked(priv->dev, &block->napi, gve_poll); + netif_napi_set_irq_locked(&block->napi, block->irq); } void gve_remove_napi(struct gve_priv *priv, int ntfy_idx) { struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx]; - netif_napi_del(&block->napi); + netif_napi_del_locked(&block->napi); } diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index d857ae3c8f06..07f4670d69d5 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -664,7 +664,7 @@ nsim_queue_mem_alloc(struct net_device *dev, void *per_queue_mem, int idx) goto err_free; if (!ns->rq_reset_mode) - netif_napi_add_config(dev, &qmem->rq->napi, nsim_poll, idx); + netif_napi_add_config_locked(dev, &qmem->rq->napi, nsim_poll, idx); return 0; @@ -681,7 +681,7 @@ static void nsim_queue_mem_free(struct net_device *dev, void *per_queue_mem) page_pool_destroy(qmem->pp); if (qmem->rq) { if (!ns->rq_reset_mode) - netif_napi_del(&qmem->rq->napi); + netif_napi_del_locked(&qmem->rq->napi); page_pool_destroy(qmem->rq->page_pool); nsim_queue_free(qmem->rq); } @@ -693,9 +693,11 @@ nsim_queue_start(struct net_device *dev, void *per_queue_mem, int idx) struct nsim_queue_mem *qmem = per_queue_mem; struct netdevsim *ns = netdev_priv(dev); + netdev_assert_locked(dev); + if (ns->rq_reset_mode == 1) { ns->rq[idx]->page_pool = qmem->pp; - napi_enable(&ns->rq[idx]->napi); + napi_enable_locked(&ns->rq[idx]->napi); return 0; } @@ -703,15 +705,15 @@ nsim_queue_start(struct net_device *dev, void *per_queue_mem, int idx) * here we want to test various call orders. */ if (ns->rq_reset_mode == 2) { - netif_napi_del(&ns->rq[idx]->napi); - netif_napi_add_config(dev, &qmem->rq->napi, nsim_poll, idx); + netif_napi_del_locked(&ns->rq[idx]->napi); + netif_napi_add_config_locked(dev, &qmem->rq->napi, nsim_poll, idx); } else if (ns->rq_reset_mode == 3) { - netif_napi_add_config(dev, &qmem->rq->napi, nsim_poll, idx); - netif_napi_del(&ns->rq[idx]->napi); + netif_napi_add_config_locked(dev, &qmem->rq->napi, nsim_poll, idx); + netif_napi_del_locked(&ns->rq[idx]->napi); } ns->rq[idx] = qmem->rq; - napi_enable(&ns->rq[idx]->napi); + napi_enable_locked(&ns->rq[idx]->napi); return 0; } @@ -721,7 +723,9 @@ static int nsim_queue_stop(struct net_device *dev, void *per_queue_mem, int idx) struct nsim_queue_mem *qmem = per_queue_mem; struct netdevsim *ns = netdev_priv(dev); - napi_disable(&ns->rq[idx]->napi); + netdev_assert_locked(dev); + + napi_disable_locked(&ns->rq[idx]->napi); if (ns->rq_reset_mode == 1) { qmem->pp = ns->rq[idx]->page_pool; diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index e64acf1992a9..35fcadad02e1 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2726,7 +2726,7 @@ static inline void netdev_assert_locked_or_invisible(struct net_device *dev) static inline bool netdev_need_ops_lock(struct net_device *dev) { - bool ret = false; + bool ret = !!(dev)->queue_mgmt_ops; #if IS_ENABLED(CONFIG_NET_SHAPER) ret |= !!(dev)->netdev_ops->net_shaper_ops; diff --git a/net/core/netdev_rx_queue.c b/net/core/netdev_rx_queue.c index ddd54e1e7289..7419c41fd3cb 100644 --- a/net/core/netdev_rx_queue.c +++ b/net/core/netdev_rx_queue.c @@ -30,6 +30,8 @@ int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx) goto err_free_new_mem; } + netdev_lock(dev); + err = qops->ndo_queue_mem_alloc(dev, new_mem, rxq_idx); if (err) goto err_free_old_mem; @@ -52,6 +54,8 @@ int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx) qops->ndo_queue_mem_free(dev, old_mem); + netdev_unlock(dev); + kvfree(old_mem); kvfree(new_mem); @@ -76,6 +80,7 @@ int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx) qops->ndo_queue_mem_free(dev, new_mem); err_free_old_mem: + netdev_unlock(dev); kvfree(old_mem); err_free_new_mem: