HI Marcin,
> -----Original Message-----
> From: dev <dev-boun...@dpdk.org> On Behalf Of Marcin Smoczynski
> Sent: Monday, September 2, 2019 7:43 PM
> To: konstantin.anan...@intel.com; keith.wi...@intel.com;
> adrien.mazarg...@6wind.com
> Cc: dev@dpdk.org; sta...@dpdk.org; Marcin Smoczynski
> <marcinx.smoczyn...@intel.com>; Mariusz Drost
> <mariuszx.dr...@intel.com>
> Subject: [dpdk-dev] [PATCH v1] net/tap: fix blocked rx packets error
>
> When OS sends more packets than are beaing read with a single
s/ beaing/being
> 'rte_eth_rx_burst' call, rx packets are getting stucked in the tap pmd
> and are unable to receive, because trigger_seen is getting updated
> and consecutive calls are not getting any packets.
>
> Do not update trigger_seen unless less than a max number of packets were
> received allowing next call to receive the rest.
>
> Fixes: a0d8e807d9 ("net/tap: add Rx trigger")
> Cc: sta...@dpdk.org
>
> Tested-by: Mariusz Drost <mariuszx.dr...@intel.com>
> Signed-off-by: Marcin Smoczynski <marcinx.smoczyn...@intel.com>
> ---
> drivers/net/tap/rte_eth_tap.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
> index 64bd04911..60121ae56 100644
> --- a/drivers/net/tap/rte_eth_tap.c
> +++ b/drivers/net/tap/rte_eth_tap.c
> @@ -353,8 +353,7 @@ pmd_rx_burst(void *queue, struct rte_mbuf **bufs,
> uint16_t nb_pkts)
>
> if (trigger == rxq->trigger_seen)
> return 0;
> - if (trigger)
> - rxq->trigger_seen = trigger;
> +
> process_private = rte_eth_devices[rxq->in_port].process_private;
> rte_compiler_barrier();
I see this compiler barrier was added together with the above
"rxq->trigger_seen = trigger", should it be removed or moved together downwards?
> for (num_rx = 0; num_rx < nb_pkts; ) {
> @@ -433,6 +432,9 @@ pmd_rx_burst(void *queue, struct rte_mbuf **bufs,
> uint16_t nb_pkts)
> rxq->stats.ipackets += num_rx;
> rxq->stats.ibytes += num_rx_bytes;
>
> + if (trigger && num_rx < nb_pkts)
> + rxq->trigger_seen = trigger;
> +
> return num_rx;
> }
>
> --
> 2.17.1
IMPORTANT NOTICE: The contents of this email and any attachments are
confidential and may also be privileged. If you are not the intended recipient,
please notify the sender immediately and do not disclose the contents to any
other person, use it for any purpose, or store or copy the information in any
medium. Thank you.
