On Mon, Mar 02, 2015 at 09:28:24PM +0800, Cunming Liang wrote:
> The mbuf leak happens when the assigned number of rx descriptor is not power
> of 2.
> As it's presumed on vpmd rx(for rx_tail wrap), adding condition check to
> prevent it.
> The root cause reference code in *_recv_raw_pkts_vec* as below.
> "rxq->rx_tail = (uint16_t)(rxq->rx_tail & (rxq->nb_rx_desc - 1));".
>
> Reported-by: Stephen Hemminger <stephen at networkplumber.org>
> Signed-off-by: Cunming Liang <cunming.liang at intel.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
> ---
> The issue was reported in
> http://www.dpdk.org/ml/archives/dev/2015-February/014127.html
>
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 51
> ++++++++++++++-------------------------
> 1 file changed, 18 insertions(+), 33 deletions(-)
>
> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> index 3059375..9ecf3e5 100644
> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> @@ -2257,7 +2257,8 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
> rxq->port_id, rxq->queue_id);
> dev->rx_pkt_burst = ixgbe_recv_pkts_bulk_alloc;
> #ifdef RTE_IXGBE_INC_VECTOR
> - if (!ixgbe_rx_vec_condition_check(dev)) {
> + if (!ixgbe_rx_vec_condition_check(dev) &&
> + (rte_is_power_of_2(nb_desc))) {
> PMD_INIT_LOG(INFO, "Vector rx enabled, please make "
> "sure RX burst size no less than 32.");
> dev->rx_pkt_burst = ixgbe_recv_pkts_vec;
> @@ -3639,31 +3640,23 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
> buf_size = (uint16_t) ((srrctl & IXGBE_SRRCTL_BSIZEPKT_MASK) <<
> IXGBE_SRRCTL_BSIZEPKT_SHIFT);
>
> - /* It adds dual VLAN length for supporting dual VLAN */
> - if ((dev->data->dev_conf.rxmode.max_rx_pkt_len +
> + if (dev->data->dev_conf.rxmode.enable_scatter ||
> + /* It adds dual VLAN length for supporting dual VLAN */
> + (dev->data->dev_conf.rxmode.max_rx_pkt_len +
> 2 * IXGBE_VLAN_TAG_SIZE) > buf_size){
> if (!dev->data->scattered_rx)
> PMD_INIT_LOG(DEBUG, "forcing scatter mode");
> dev->data->scattered_rx = 1;
> #ifdef RTE_IXGBE_INC_VECTOR
> - dev->rx_pkt_burst = ixgbe_recv_scattered_pkts_vec;
> -#else
> - dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
> + if (rte_is_power_of_2(rxq->nb_rx_desc))
> + dev->rx_pkt_burst =
> + ixgbe_recv_scattered_pkts_vec;
> + else
> #endif
> + dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
> }
> }
>
> - if (dev->data->dev_conf.rxmode.enable_scatter) {
> - if (!dev->data->scattered_rx)
> - PMD_INIT_LOG(DEBUG, "forcing scatter mode");
> -#ifdef RTE_IXGBE_INC_VECTOR
> - dev->rx_pkt_burst = ixgbe_recv_scattered_pkts_vec;
> -#else
> - dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
> -#endif
> - dev->data->scattered_rx = 1;
> - }
> -
> /*
> * Device configured with multiple RX queues.
> */
> @@ -4156,17 +4149,20 @@ ixgbevf_dev_rx_init(struct rte_eth_dev *dev)
> buf_size = (uint16_t) ((srrctl & IXGBE_SRRCTL_BSIZEPKT_MASK) <<
> IXGBE_SRRCTL_BSIZEPKT_SHIFT);
>
> - /* It adds dual VLAN length for supporting dual VLAN */
> - if ((dev->data->dev_conf.rxmode.max_rx_pkt_len +
> + if (dev->data->dev_conf.rxmode.enable_scatter ||
> + /* It adds dual VLAN length for supporting dual VLAN */
> + (dev->data->dev_conf.rxmode.max_rx_pkt_len +
> 2 * IXGBE_VLAN_TAG_SIZE) > buf_size) {
> if (!dev->data->scattered_rx)
> PMD_INIT_LOG(DEBUG, "forcing scatter mode");
> dev->data->scattered_rx = 1;
> #ifdef RTE_IXGBE_INC_VECTOR
> - dev->rx_pkt_burst = ixgbe_recv_scattered_pkts_vec;
> -#else
> - dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
> + if (rte_is_power_of_2(rxq->nb_rx_desc))
> + dev->rx_pkt_burst =
> + ixgbe_recv_scattered_pkts_vec;
> + else
> #endif
> + dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
> }
> }
>
> @@ -4184,17 +4180,6 @@ ixgbevf_dev_rx_init(struct rte_eth_dev *dev)
> IXGBE_PSRTYPE_RQPL_SHIFT;
> IXGBE_WRITE_REG(hw, IXGBE_VFPSRTYPE, psrtype);
>
> - if (dev->data->dev_conf.rxmode.enable_scatter) {
> - if (!dev->data->scattered_rx)
> - PMD_INIT_LOG(DEBUG, "forcing scatter mode");
> -#ifdef RTE_IXGBE_INC_VECTOR
> - dev->rx_pkt_burst = ixgbe_recv_scattered_pkts_vec;
> -#else
> - dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
> -#endif
> - dev->data->scattered_rx = 1;
> - }
> -
> return 0;
> }
>
> --
> 1.8.1.4
>
