From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 3C145A04AB; Mon, 11 Nov 2019 17:56:59 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id ABED1237; Mon, 11 Nov 2019 17:56:58 +0100 (CET) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by dpdk.org (Postfix) with ESMTP id 6682591 for ; Mon, 11 Nov 2019 17:56:56 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Nov 2019 08:56:55 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,293,1569308400"; d="scan'208";a="207158348" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.96]) ([10.237.221.96]) by orsmga006.jf.intel.com with ESMTP; 11 Nov 2019 08:56:53 -0800 To: "Yigit, Ferruh" , Nilanjan Sarkar , dev@dpdk.org Cc: Thomas Monjalon , Andrew Rybchenko , Konstantin Ananyev , Bruce Richardson , "Kinsella, Ray" , Olivier MATZ , Jerin Jacob References: <20190808122819.6015-1-nsarkar@sandvine.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] eal: added new api to only enqueue a packet in tx buffer X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 10/18/2019 5:24 PM, Yigit, Ferruh wrote: > On 8/8/2019 1:28 PM, Nilanjan Sarkar wrote: >> This api is similar like api `rte_eth_tx_buffer` except it >> does not attempt to flush the buffer in case buffer is full. >> The advantage is that, this api does not need port id and >> queue id. In case port id and queue id are shared within threads >> then application can not buffer a packet until it gets access >> to port and queue. So this function segregate buffering >> job from flushing job and thus removes dependency on port and queue. > > Hi Nilanjan, > > Sorry, the patch seems missed because of the misleading module info in the patch > title, this is not an 'eal' patch but a 'ethdev' patch ... > > Related to the API, it looks like target is to reduce the critical section which > looks reasonable to me. > > A concern is related to the making this function inline, we are discussing > moving existing inline functions to regular functions, this may have performance > affect but if the drop is acceptable what about making this an ethdev API? > There was no response on making the new proposed API a proper function. @Thomas, @Andrew, et al, What do you think about a new static inline ethdev API? > >> >> Signed-off-by: Nilanjan Sarkar >> --- >> lib/librte_ethdev/rte_ethdev.h | 29 +++++++++++++++++++++++++++++ >> 1 file changed, 29 insertions(+) >> >> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h >> index dc6596bc9..bd8b8fee4 100644 >> --- a/lib/librte_ethdev/rte_ethdev.h >> +++ b/lib/librte_ethdev/rte_ethdev.h >> @@ -4569,6 +4569,35 @@ rte_eth_tx_buffer(uint16_t port_id, uint16_t queue_id, >> return rte_eth_tx_buffer_flush(port_id, queue_id, buffer); >> } >> >> +/** >> + * Buffer a single packet for future transmission on Tx buffer. This buffer >> + * can be sent to a port and queue of a NIC using rte_eth_tx_buffer_flush () >> + * call. >> + * >> + * This function enqueues a packet to Tx buffer. In case there is no space >> + * in Tx buffer, this function fails. >> + * Tx buffer will be flushed using rte_eth_tx_buffer_flush () call. It is >> + * application's responsibility to flush the Tx buffer in regular interval. >> + * >> + * @param buffer >> + * Buffer used to collect packets to be sent. >> + * @param tx_pkt >> + * Pointer to the packet mbuf to be sent. >> + * @return >> + * 0 = packet has been buffered for later transmission >> + * -1 = Packet can not be buffered since it reached limit >> + */ >> +static __rte_always_inline int >> +rte_eth_tx_enqueue(struct rte_eth_dev_tx_buffer *buffer, struct rte_mbuf *tx_pkt) >> +{ >> + if (buffer->length < buffer->size) { >> + buffer->pkts[buffer->length++] = tx_pkt; >> + return 0; >> + } >> + >> + return -1; >> +} >> + >> #ifdef __cplusplus >> } >> #endif >> >