Date: Sun, 12 Oct 2014 00:24:57 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Adrian Chadd <adrian@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, Elof Ofel <elofu17@hotmail.com>, "Alexander V. Chernikov" <melifaro@freebsd.org>, Jack Vogel <jfvogel@gmail.com> Subject: Re: individual queue blocking entire rx unit on ixgbe (Re: How do I balance bandwidth over several virtual NICs?) Message-ID: <20141011222457.GA11694@onelab2.iet.unipi.it> In-Reply-To: <CAJ-VmokbhQj2ThjVa3NwUgDfiDt5vqVXvuZWvar%2BG2X0kM8_tQ@mail.gmail.com> References: <CA%2BhQ2%2BhYY7AWE7jJWAg8uYER2LRSPz8TcVPuamsRBLj_WQyakw@mail.gmail.com> <CAJ-Vmo=xiZtKkQEV30Y_c7a6uWD6PbuqzmSSDG12J=w8Z45biA@mail.gmail.com> <20141001203223.GA12122@onelab2.iet.unipi.it> <CAJ-Vmom%2BDsDDa-1GgpUBps8=hMM_1c5auH5kKRiCxAs=w_Casg@mail.gmail.com> <20141001234926.GC13187@onelab2.iet.unipi.it> <CAJ-Vmo=6%2BzPhmmn=uEAX4V0MLqay8iN8yF2zeXYH5zFP6vHJwg@mail.gmail.com> <20141001235312.GA14593@onelab2.iet.unipi.it> <CAJ-VmokesukRXn1=9Rx0npJqYzUcTZ6=i%2BY5OjRFXdQFEM_2HQ@mail.gmail.com> <CAJ-VmokbhQj2ThjVa3NwUgDfiDt5vqVXvuZWvar%2BG2X0kM8_tQ@mail.gmail.com>
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On Sat, Oct 11, 2014 at 03:03:13PM -0700, Adrian Chadd wrote:
> Ping,
>
> Luigi - would you mind sending through a diff ? I'd like to get this
> into -HEAD on both igb and ixgbe.
here it is.
As a result of this patch, ixgbe_rx_enable_drop() and the disable function
become useless and should be removed.
Probably the code (or the commit log) should also mention that the DROP_EN
bit is only read when the rx unit is started, this is why the code should
go here and not in the sysctl handler.
cheers
luigi
Index: ixgbe.c
===================================================================
--- ixgbe.c (revision 272603)
+++ ixgbe.c (working copy)
@@ -4377,6 +4377,19 @@
srrctl &= ~IXGBE_SRRCTL_BSIZEPKT_MASK;
srrctl |= bufsz;
srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
+ /*
+ * Set DROP_EN iff we have no flow control and >1 queue.
+ * Note that srrctl was cleared shortly before during reset,
+ * so we do not need to clear the bit, but do it just in case
+ * this code is moved elsewhere.
+ */
+ if (adapter->num_queues > 1 &&
+ adapter->hw.fc.requested_mode == ixgbe_fc_none) {
+ srrctl |= IXGBE_SRRCTL_DROP_EN;
+ } else {
+ srrctl &= ~IXGBE_SRRCTL_DROP_EN;
+ }
+
IXGBE_WRITE_REG(hw, IXGBE_SRRCTL(i), srrctl);
/* Setup the HW Rx Head and Tail Descriptor Pointers */
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