[PATCH v6] gro : packets not getting flushed in heavy-weight mode API
Ferruh Yigit
ferruh.yigit at amd.com
Mon Feb 12 16:05:22 CET 2024
On 2/11/2024 4:55 AM, Kumara Parameshwaran wrote:
> In heavy-weight mode GRO which is based on timer, the GRO packets
> will not be flushed in spite of timer expiry if there is no packet
> in the current poll. If timer mode GRO is enabled the
> rte_gro_timeout_flush API should be invoked.
>
Related to the patch title, 'gro: ' indicates a component for gro
library (lib/gro), but this is a testpmd patch, can you please update it as:
"app/testpmd: <verb> ..."
And can you please add a fixes tag [1], so this patch can be backported.
[1]
https://doc.dpdk.org/guides/contributing/patches.html#commit-messages-body
> Signed-off-by: Kumara Parameshwaran <kumaraparamesh92 at gmail.com>
> ---
> v1:
> Changes to make sure that the GRO flush API is invoked if there are no packets in
> current poll and timer expiry.
>
> v2:
> Fix code organisation issue
>
> v3:
> Fix warnings
>
> v4:
> Fix error and warnings
>
> v5:
> Fix compilation issue when GRO is not defined
>
> v6:
> Address review comments
>
> app/test-pmd/csumonly.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
> index c103e54111..21b45b4ba4 100644
> --- a/app/test-pmd/csumonly.c
> +++ b/app/test-pmd/csumonly.c
> @@ -863,16 +863,22 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
>
> /* receive a burst of packet */
> nb_rx = common_fwd_stream_receive(fs, pkts_burst, nb_pkt_per_burst);
> +#ifndef RTE_LIB_GRO
> if (unlikely(nb_rx == 0))
> return false;
> -
> +#else
> + gro_enable = gro_ports[fs->rx_port].enable;
> + if (unlikely(nb_rx == 0)) {
> + if (!gro_enable || (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES))
> + return false;
> + if ((rte_gro_get_pkt_count(current_fwd_lcore()->gro_ctx) == 0))
> + return false;
>
Why not "||" this condition to previous if block, instead of adding a
new if?
> + }
> +#endif
>
Can you please put a comment in the GRO block that explains why these
checks are done and why we may not want to return although 'nb_rx == 0'?
Another option is make the block as below and keep the code below to get
'gro_enable':
```
if (unlikely(nb_rx == 0)) {
#ifndef RTE_LIB_GRO
return false;
#else
// Comment explaining what is done here
gro_enable = gro_ports[fs->rx_port].enable;
if (...)
return false;
#endif
}
```
Above sample that keeps the #ifdef in a narrow scope ("nb_rx == 0"
block) looks tidier to me, but both works fine, no strong opinion from
me, what do you think?
> rx_bad_ip_csum = 0;
> rx_bad_l4_csum = 0;
> rx_bad_outer_l4_csum = 0;
> rx_bad_outer_ip_csum = 0;
> -#ifdef RTE_LIB_GRO
> - gro_enable = gro_ports[fs->rx_port].enable;
> -#endif
>
> txp = &ports[fs->tx_port];
> tx_offloads = txp->dev_conf.txmode.offloads;
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