From: Morten Brørup <mb@smartsharesystems.com> To: thomas@monjalon.net, ferruh.yigit@intel.com, arybchenko@solarflare.com, bruce.richardson@intel.com Cc: jia.guo@intel.com, dev@dpdk.org, Morten Brørup <mb@smartsharesystems.com> Subject: [dpdk-dev] [PATCH] ethdev: rte_eth_rx_burst() nb_pkts requirements Date: Mon, 14 Sep 2020 13:05:11 +0200 Message-ID: <20200914110511.95609-1-mb@smartsharesystems.com> (raw) Updated description of rte_eth_rx_burst() to reflect what drivers, when using vector instructions, expect from nb_pkts. Also discussed on the mailing list here: http://inbox.dpdk.org/dev/98CBD80474FA8B44BF855DF32C47DC35C61257@smartserver.smartshare.dk/ Signed-off-by: Morten Brørup <mb@smartsharesystems.com> --- lib/librte_ethdev/rte_ethdev.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h index 70295d7ab..41f8ba4ef 100644 --- a/lib/librte_ethdev/rte_ethdev.h +++ b/lib/librte_ethdev/rte_ethdev.h @@ -4469,6 +4469,10 @@ int rte_eth_dev_hairpin_capability_get(uint16_t port_id, * burst-oriented optimizations in both synchronous and asynchronous * packet processing environments with no overhead in both cases. * + * @note + * Some drivers using vector instructions require that *nb_pkts* is + * divisible by 4 or 8, depending on the driver implementation. + * * The rte_eth_rx_burst() function does not provide any error * notification to avoid the corresponding overhead. As a hint, the * upper-level application might check the status of the device link once @@ -4485,6 +4489,7 @@ int rte_eth_dev_hairpin_capability_get(uint16_t port_id, * must be large enough to store *nb_pkts* pointers in it. * @param nb_pkts * The maximum number of packets to retrieve. + * The value must be divisible by 8 in order to work with any driver. * @return * The number of packets actually retrieved, which is the number * of pointers to *rte_mbuf* structures effectively supplied to the -- 2.17.1
next reply other threads:[~2020-09-14 11:05 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-09-14 11:05 Morten Brørup [this message] 2020-09-14 11:26 ` Bruce Richardson 2020-09-14 12:42 ` [dpdk-dev] [PATCH] ethdev: rte_eth_rx_burst() nb_pktsrequirements Morten Brørup 2020-10-13 10:55 ` Ferruh Yigit 2020-10-14 8:26 ` [dpdk-dev] [PATCH] ethdev: rte_eth_rx_burst()nb_pktsrequirements Morten Brørup 2020-10-14 8:53 ` Thomas Monjalon 2020-10-14 9:29 ` Bruce Richardson 2020-10-14 11:14 ` Morten Brørup 2020-10-14 11:38 ` Bruce Richardson 2020-10-15 7:36 ` Morten Brørup 2020-10-26 15:06 ` [dpdk-dev] [PATCH] ethdev: rte_eth_rx_burst() nb_pkts requirements Morten Brørup 2020-10-26 15:15 ` Ajit Khaparde 2020-10-27 10:24 ` Bruce Richardson 2020-10-30 9:27 ` Ferruh Yigit
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