From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: "Richardson, Bruce" <bruce.richardson@intel.com>,
"Traynor, Kevin" <kevin.traynor@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] ixgbe: change logging for ixgbe tx code path selection
Date: Tue, 27 Oct 2015 12:12:39 +0000 [thread overview]
Message-ID: <2601191342CEEE43887BDE71AB97725836AB5666@irsmsx105.ger.corp.intel.com> (raw)
In-Reply-To: <20151027115003.GA7500@bricha3-MOBL3>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Bruce Richardson
> Sent: Tuesday, October 27, 2015 11:50 AM
> To: Traynor, Kevin
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] ixgbe: change logging for ixgbe tx code path selection
>
> On Tue, Oct 27, 2015 at 11:41:08AM +0000, Kevin Traynor wrote:
> > Simple and vector are different tx code paths. If vector
> > is selected, change logging from:
> > PMD: ixgbe_set_tx_function(): Using simple tx code path
> > PMD: ixgbe_set_tx_function(): Vector tx enabled.
> >
> > to:
> > PMD: ixgbe_set_tx_function(): Using vector tx code path
> >
> > or, if simple selected:
> > PMD: ixgbe_set_tx_function(): Using simple tx code path
> >
> > The dangling else in the #ifdef makes readability difficult,
> > so resolving in way that seems most readable.
> >
> > Signed-off-by: Kevin Traynor <kevin.traynor@intel.com>
> > ---
> > drivers/net/ixgbe/ixgbe_rxtx.c | 8 +++++---
> > 1 files changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
> > index a598a72..11d7feb 100644
> > --- a/drivers/net/ixgbe/ixgbe_rxtx.c
> > +++ b/drivers/net/ixgbe/ixgbe_rxtx.c
> > @@ -1963,16 +1963,18 @@ ixgbe_set_tx_function(struct rte_eth_dev *dev, struct ixgbe_tx_queue *txq)
> > /* Use a simple Tx queue (no offloads, no multi segs) if possible */
> > if (((txq->txq_flags & IXGBE_SIMPLE_FLAGS) == IXGBE_SIMPLE_FLAGS)
> > && (txq->tx_rs_thresh >= RTE_PMD_IXGBE_TX_MAX_BURST)) {
> > - PMD_INIT_LOG(DEBUG, "Using simple tx code path");
> > #ifdef RTE_IXGBE_INC_VECTOR
> > if (txq->tx_rs_thresh <= RTE_IXGBE_TX_MAX_FREE_BUF_SZ &&
> > (rte_eal_process_type() != RTE_PROC_PRIMARY ||
> > ixgbe_txq_vec_setup(txq) == 0)) {
> > - PMD_INIT_LOG(DEBUG, "Vector tx enabled.");
> > + PMD_INIT_LOG(DEBUG, "Using vector tx code path");
> > dev->tx_pkt_burst = ixgbe_xmit_pkts_vec;
> > } else
> > #endif
> > - dev->tx_pkt_burst = ixgbe_xmit_pkts_simple;
> > + {
> > + PMD_INIT_LOG(DEBUG, "Using simple tx code path");
> > + dev->tx_pkt_burst = ixgbe_xmit_pkts_simple;
> > + }
> > } else {
> > PMD_INIT_LOG(DEBUG, "Using full-featured tx code path");
> > PMD_INIT_LOG(DEBUG,
> > --
> > 1.7.4.1
> >
> Hi Kevin,
>
> can I suggest a slight alternative here that might help make things easier.
> Instead of printing the message as we pick the code path, why not have a "logmsg"
> pointer variable that is assigned in the code, and then print out the log path
> at the end.
>
> This would have a number of advantages:
> 1. there are no issues with changing our mind, so we can assign one path type,
> and then later change it to something different without cluttering up the debug
> output with the history of our code's flow.
> 2. it means that you don't have a problem with smaller else legs as you can
> easily do multiple assignments in the one line using a comma as:
> dev->tx_pkt_burst = ixgbe_xmit_pkts_simple, logmsg = "Using simple ...";
While I like approach with logmsg, please avoid commas here.
It will make this peace of code even more hard to read (at least for me).
Konstantin
>
> Regards,
> /Bruce
next prev parent reply other threads:[~2015-10-27 12:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-27 11:41 Kevin Traynor
2015-10-27 11:50 ` Bruce Richardson
2015-10-27 12:12 ` Ananyev, Konstantin [this message]
2015-10-27 12:37 ` Bruce Richardson
2015-10-27 17:31 ` Traynor, Kevin
2015-10-28 10:54 ` Bruce Richardson
2015-10-27 13:56 ` Mcnamara, John
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