Re: [dpdk-dev] [PATCH v5 03/10] examples/ipsec-secgw: fix crypto-op might never get dequeued

[Akhil Goyal <akhil.goyal@nxp.com>]

On 12/28/2018 9:03 PM, Konstantin Ananyev wrote:
> In some cases crypto-ops could never be dequeued from the crypto-device.
> The easiest way to reproduce:
> start ipsec-secgw with crypto-dev and send to it less then 32 packets.
> none packets will be forwarded.
> Reason for that is that the application does dequeue() from crypto-queues
> only when new packets arrive.
> This patch makes sure it calls dequeue() on a regular basis.
>
> Fixes: c64278c0c18b ("examples/ipsec-secgw: rework processing loop")
> Cc: stable@dpdk.org
>
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> Acked-by: Radu Nicolau <radu.nicolau@intel.com>
> ---
>   examples/ipsec-secgw/ipsec-secgw.c | 136 ++++++++++++++++++++++++-----
>   examples/ipsec-secgw/ipsec.c       |  60 ++++++++-----
>   examples/ipsec-secgw/ipsec.h       |  11 +++
>   3 files changed, 165 insertions(+), 42 deletions(-)
[snip]
> +
>   /* main processing loop */
>   static int32_t
>   main_loop(__attribute__((unused)) void *dummy)
> @@ -866,7 +958,8 @@ main_loop(__attribute__((unused)) void *dummy)
>   		diff_tsc = cur_tsc - prev_tsc;
>   
>   		if (unlikely(diff_tsc > drain_tsc)) {
> -			drain_buffers(qconf);
> +			drain_tx_buffers(qconf);
> +			drain_crypto_buffers(qconf);
>   			prev_tsc = cur_tsc;
>   		}
>   
> @@ -880,6 +973,9 @@ main_loop(__attribute__((unused)) void *dummy)
>   			if (nb_rx > 0)
>   				process_pkts(qconf, pkts, nb_rx, portid);
>   		}
> +
> +		drain_inbound_crypto_queues(qconf, &qconf->inbound);
> +		drain_outbound_crypto_queues(qconf, &qconf->outbound);

drain_inbound_crypto_queues and drain_outbound_crypto_queues should be called based on diff_tsc.
moving these two lines above after  drain_crypto_buffers will improve the performance drop caused due to this patch.