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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] net/tap: free mempool when closing X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 7/29/2020 12:35 PM, wangyunjian wrote: > From: Yunjian Wang > > 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 <...> > @@ -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.