From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Coquelin Subject: Re: [PATCH v3] net/virtio: set offload flag for jumbo frames Date: Thu, 31 Jan 2019 10:28:51 +0100 Message-ID: <9548b894-0b49-6a32-37cf-c3eb9fbae3ee@redhat.com> References: <20190131091736.14844-1-jfreimann@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: tiwei.bie@intel.com, stable@dpdk.org To: Jens Freimann , dev@dpdk.org Return-path: In-Reply-To: <20190131091736.14844-1-jfreimann@redhat.com> Content-Language: en-US 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 1/31/19 10:17 AM, Jens Freimann wrote: > Port configuration fails because offload flags don't match the expected > value when max-pkt-len is set to a value that should enable receive port > offloading but doesn't. > > There are two cases to consider: > > 1. VIRTIO_NET_F_MTU is set. Then we need to check if the requested > max-pkt-len fits into the MTU plus header. If yes we set the > offload flag. > 2. VIRTIO_NET_F_MTU is not set. We can set the offload flag. > > Fixes: a4996bd89c42 ("ethdev: new Rx/Tx offloads API") > Cc: stable@dpdk.org > > Signed-off-by: Jens Freimann > --- > v2->v3: > * remove unnecessary brackets (Maxime) > * fix commit message (David) > > v1->v2: > * include virtnet hdr, ethernet header, vlan tag when comparing against > max-rx-pkt-len (Maxime) > > drivers/net/virtio/virtio_ethdev.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) Reviewed-by: Maxime Coquelin Thanks, Maxime > > diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c > index 7c4c1df00..f39d4e630 100644 > --- a/drivers/net/virtio/virtio_ethdev.c > +++ b/drivers/net/virtio/virtio_ethdev.c > @@ -2351,6 +2351,20 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) > if ((host_features & tso_mask) == tso_mask) > dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_TCP_LRO; > > + if (host_features & (1ULL << VIRTIO_NET_F_MTU)) { > + struct virtio_net_config config; > + uint32_t ether_hdr_len = ETHER_HDR_LEN + VLAN_TAG_LEN + > + hw->vtnet_hdr_size; > + vtpci_read_dev_config(hw, > + offsetof(struct virtio_net_config, mtu), > + &config.mtu, sizeof(config.mtu)); > + if (dev->data->dev_conf.rxmode.max_rx_pkt_len <= > + config.mtu + ether_hdr_len) > + dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_JUMBO_FRAME; > + } else { > + dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_JUMBO_FRAME; > + } > + > dev_info->tx_offload_capa = DEV_TX_OFFLOAD_MULTI_SEGS | > DEV_TX_OFFLOAD_VLAN_INSERT; > if (host_features & (1ULL << VIRTIO_NET_F_CSUM)) { >