Hi Ouyang, 2014-07-23 12:48, Ouyang Changchun: > Update comments for the field start_rx_per_q for better readability. > Rename the field name to rx_enable_queue for better readability too. > Accordingly Update its reference in sample vhost.
> - uint8_t start_rx_per_q; /**< start rx per queue. */ > + /**< If rx_enable_queue is true, rte_eth_dev_rx_queue_start should be > + invocated to start RX for one queue after rte_eth_dev_start is > + invocated, and rte_eth_dev_rx_queue_start instead of > + rte_eth_dev_start is responsible for allocating mbuf from > + mempool and setup the DMA physical address. It is useful in > + such scenario: buffer address is not available at the point of > + rte_eth_dev_start's invocating but available later, e.g. in > + VHOST zero copy case, the buffer address used to setup DMA > + address is available only after one VM(guest) startup. */ > + uint8_t rx_enable_queue; > }; I have many comments here. The doxygen comment /**< must be used only after the symbol you are commenting: http://doxygen.org/manual/docblocks.html#memberdoc The comment is too long. The use case would be in the manual, not in doxygen. The comment about rte_eth_dev_rx_queue_start would be in the doxygen comment of rte_eth_dev_rx_queue_start. When this variable is set, it doesn't enable anything. It only disables the queue when doing a global start. Its name should be rx_deferred_start. All fields of this structure are about one queue, so the "queue" word is not needed. > - uint8_t start_tx_per_q; /**< start tx per queue. */ > + /**< If tx_enable_queue is true, rte_eth_dev_tx_queue_start must be > + invocated to start TX for one queue after rte_eth_dev_start is > + invocated. Refer to start_rx_per_q for the use case. */ > + uint8_t tx_enable_queue; > }; You refer to the old name (start_rx_per_q). By the way, a one line description (without referral) for both fields should be enough. Something like "do not start with rte_eth_dev_start()". > @@ -3652,13 +3652,13 @@ ixgbe_dev_rxtx_start(struct rte_eth_dev *dev) > > for (i = 0; i < dev->data->nb_tx_queues; i++) { > txq = dev->data->tx_queues[i]; > - if (!txq->start_tx_per_q) > + if (!txq->tx_enable_queue) > ixgbe_dev_tx_queue_start(dev, i); > } Here it's clear that this field is about disabling start. Please rework this patch and update i40e accordingly. Thanks -- Thomas