[dpdk-dev] [PATCH 2/2] net/sfc: free mbufs in bulks on simple EF10 Tx datapath reap
Andrew Rybchenko
arybchenko at solarflare.com
Wed Sep 13 11:32:08 CEST 2017
On 09/12/2017 09:28 PM, Ferruh Yigit wrote:
> On 9/8/2017 3:15 PM, Andrew Rybchenko wrote:
>> From: Ivan Malov <ivan.malov at oktetlabs.ru>
>>
>> Signed-off-by: Ivan Malov <ivan.malov at oktetlabs.ru>
>> Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
>> ---
>> doc/guides/nics/sfc_efx.rst | 4 +++-
>> drivers/net/sfc/sfc_dp_tx.h | 2 ++
>> drivers/net/sfc/sfc_ef10_tx.c | 15 ++++++++++++++-
>> drivers/net/sfc/sfc_ethdev.c | 6 ++++++
>> drivers/net/sfc/sfc_tx.c | 17 +++++++++++++++++
>> 5 files changed, 42 insertions(+), 2 deletions(-)
>>
>> diff --git a/doc/guides/nics/sfc_efx.rst b/doc/guides/nics/sfc_efx.rst
>> index 973a4a0..028b980 100644
>> --- a/doc/guides/nics/sfc_efx.rst
>> +++ b/doc/guides/nics/sfc_efx.rst
>> @@ -245,12 +245,14 @@ boolean parameters value.
>> features available and required by the datapath implementation.
>> **efx** chooses libefx-based datapath which supports VLAN insertion
>> (full-feature firmware variant only), TSO and multi-segment mbufs.
>> + Mbuf segments may come from different mempools, and mbuf reference
>> + counters are treated responsibly.
> This is also the case for ef10 native, right? Does it make sense to
> document it in below too?
Thanks, will add.
>> **ef10** chooses EF10 (SFN7xxx, SFN8xxx) native datapath which is
>> more efficient than libefx-based but has no VLAN insertion and TSO
>> support yet.
>> **ef10_simple** chooses EF10 (SFN7xxx, SFN8xxx) native datapath which
>> is even more faster then **ef10** but does not support multi-segment
>> - mbufs.
>> + mbufs, disallows multiple mempools and neglects mbuf reference counters.
>>
>> - ``perf_profile`` [auto|throughput|low-latency] (default **throughput**)
>>
> <...>
>
>> --- a/drivers/net/sfc/sfc_ef10_tx.c
>> +++ b/drivers/net/sfc/sfc_ef10_tx.c
>> @@ -401,14 +401,25 @@ struct sfc_ef10_txq {
>> pending += sfc_ef10_tx_process_events(txq);
>>
>> if (pending != completed) {
>> + struct rte_mbuf *bulk[SFC_TX_REAP_BULK_SIZE];
>> + unsigned int nb = 0;
>> +
>> do {
>> struct sfc_ef10_tx_sw_desc *txd;
>>
>> txd = &txq->sw_ring[completed & ptr_mask];
>>
>> - rte_pktmbuf_free_seg(txd->mbuf);
>> + if (nb == RTE_DIM(bulk)) {
>> + rte_mempool_put_bulk(bulk[0]->pool,
>> + (void *)bulk, nb);
> same warning here, again false positive I think:
> error #3656: variable "bulk" may be used before its value is set
I think this one is false positive as well.
> The patch to ignore the warning will take care of this one too.
>
>> + nb = 0;
>> + }
>> +
>> + bulk[nb++] = txd->mbuf;
>> } while (++completed != pending);
>>
>> + rte_mempool_put_bulk(bulk[0]->pool, (void *)bulk, nb);
>> +
>> txq->completed = completed;
>> }
> <...>
>
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