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To: wangyunjian <wangyunjian@huawei.com>, dev@dpdk.org
Cc: keith.wiles@intel.com, ophirmu@mellanox.com, jerry.lilijun@huawei.com,
xudingke@huawei.com, stable@dpdk.org
References: <40a0e68ed41b05fba8cbe5f34e369a59a1c0c09c.1596022448.git.wangyunjian@huawei.com>
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Message-ID: <a5329cff-d7a7-31f4-0fde-e258dde072d4@intel.com>
Date: Wed, 5 Aug 2020 17:35:49 +0100
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In-Reply-To: <40a0e68ed41b05fba8cbe5f34e369a59a1c0c09c.1596022448.git.wangyunjian@huawei.com>
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Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] net/tap: free mempool when
closing
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On 7/29/2020 12:35 PM, wangyunjian wrote:
> From: Yunjian Wang <wangyunjian@huawei.com>
>
> When setup tx queues, we will create a mempool for the 'gso_ctx'.
> The mempool is not freed when closing tap device. If free the tap
> device and create it with different name, it will create a new
> mempool. This maybe cause an OOM.
>
> Fixes: 050316a88313 ("net/tap: support TSO (TCP Segment Offload)")
> Cc: stable@dpdk.org
>
> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
<...>
> @@ -1317,26 +1320,31 @@ tap_gso_ctx_setup(struct rte_gso_ctx *gso_ctx, struct rte_eth_dev *dev)
> {
> uint32_t gso_types;
> char pool_name[64];
> -
> - /*
> - * Create private mbuf pool with TAP_GSO_MBUF_SEG_SIZE bytes
> - * size per mbuf use this pool for both direct and indirect mbufs
> - */
> -
> - struct rte_mempool *mp; /* Mempool for GSO packets */
> + struct pmd_internals *pmd = dev->data->dev_private;
> + int ret;
>
> /* initialize GSO context */
> gso_types = DEV_TX_OFFLOAD_TCP_TSO;
> - snprintf(pool_name, sizeof(pool_name), "mp_%s", dev->device->name);
> - mp = rte_mempool_lookup((const char *)pool_name);
> - if (!mp) {
> - mp = rte_pktmbuf_pool_create(pool_name, TAP_GSO_MBUFS_NUM,
> - TAP_GSO_MBUF_CACHE_SIZE, 0,
> + if (!pmd->gso_ctx_mp) {
> + /*
> + * Create private mbuf pool with TAP_GSO_MBUF_SEG_SIZE
> + * bytes size per mbuf use this pool for both direct and
> + * indirect mbufs
> + */
> + ret = snprintf(pool_name, sizeof(pool_name), "mp_%s",
> + dev->device->name);
> + if (ret < 0 || ret >= (int)sizeof(pool_name)) {
> + TAP_LOG(ERR,
> + "%s: failed to create mbuf pool "
> + "name for device %s\n",
> + pmd->name, dev->device->name);
Overall looks good. Only above error doesn't say why it failed, informing the
user that device name is too long may help her to overcome the error.