From owner-dev-commits-src-main@freebsd.org Mon May 3 17:55:46 2021 Return-Path: Delivered-To: dev-commits-src-main@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 41B17638C7F; Mon, 3 May 2021 17:55:46 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FYrHP73c5z3JYZ; Mon, 3 May 2021 17:55:45 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id CF1C62245A; Mon, 3 May 2021 17:55:45 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 143HtjIt046939; Mon, 3 May 2021 17:55:45 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 143Htj33046938; Mon, 3 May 2021 17:55:45 GMT (envelope-from git) Date: Mon, 3 May 2021 17:55:45 GMT Message-Id: <202105031755.143Htj33046938@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Mark Johnston Subject: git: 64881da47807 - main - ixgbe: Restore AIM support MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 64881da478071431a2d9e62613997a5772c56cdf Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 May 2021 17:55:46 -0000 The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=64881da478071431a2d9e62613997a5772c56cdf commit 64881da478071431a2d9e62613997a5772c56cdf Author: Sai Rajesh Tallamraju AuthorDate: 2021-05-03 17:45:00 +0000 Commit: Mark Johnston CommitDate: 2021-05-03 17:47:14 +0000 ixgbe: Restore AIM support AIM (adaptive interrupt moderation) was part of BSD11 driver. Upon IFLIB migration, AIM feature got lost. Re-introducing AIM back into IFLIB based IXGBE driver. One caveat is that in BSD11 driver, a queue comprises both Rx and Tx ring. Starting from BSD12, Rx and Tx have their own queues and rings. Also, IRQ is now only configured for Rx side. So, when AIM is re-enabled, we should now consider only Rx stats for configuring EITR register in contrast to BSD11 where Rx and Tx stats were considered to manipulate EITR register. Reviewed by: gallatin, markj Sponsored by: NetApp, Inc. MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D27344 --- sys/dev/ixgbe/if_ix.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++ sys/dev/ixgbe/ixgbe.h | 1 + 2 files changed, 74 insertions(+) diff --git a/sys/dev/ixgbe/if_ix.c b/sys/dev/ixgbe/if_ix.c index 489e891cf509..fbe4f1df38ca 100644 --- a/sys/dev/ixgbe/if_ix.c +++ b/sys/dev/ixgbe/if_ix.c @@ -347,6 +347,16 @@ static int ixgbe_enable_rss = 1; SYSCTL_INT(_hw_ix, OID_AUTO, enable_rss, CTLFLAG_RDTUN, &ixgbe_enable_rss, 0, "Enable Receive-Side Scaling (RSS)"); +/* + * AIM: Adaptive Interrupt Moderation + * which means that the interrupt rate + * is varied over time based on the + * traffic for that interrupt vector + */ +static int ixgbe_enable_aim = FALSE; +SYSCTL_INT(_hw_ix, OID_AUTO, enable_aim, CTLFLAG_RWTUN, &ixgbe_enable_aim, 0, + "Enable adaptive interrupt moderation"); + #if 0 /* Keep running tab on them for sanity check */ static int ixgbe_total_ports; @@ -2100,6 +2110,60 @@ fail: return (error); } /* ixgbe_if_msix_intr_assign */ +static inline void +ixgbe_perform_aim(struct adapter *adapter, struct ix_rx_queue *que) +{ + uint32_t newitr = 0; + struct rx_ring *rxr = &que->rxr; + + /* + * Do Adaptive Interrupt Moderation: + * - Write out last calculated setting + * - Calculate based on average size over + * the last interval. + */ + if (que->eitr_setting) { + IXGBE_WRITE_REG(&adapter->hw, IXGBE_EITR(que->msix), + que->eitr_setting); + } + + que->eitr_setting = 0; + /* Idle, do nothing */ + if (rxr->bytes == 0) { + return; + } + + if ((rxr->bytes) && (rxr->packets)) { + newitr = (rxr->bytes / rxr->packets); + } + + newitr += 24; /* account for hardware frame, crc */ + /* set an upper boundary */ + newitr = min(newitr, 3000); + + /* Be nice to the mid range */ + if ((newitr > 300) && (newitr < 1200)) { + newitr = (newitr / 3); + } else { + newitr = (newitr / 2); + } + + if (adapter->hw.mac.type == ixgbe_mac_82598EB) { + newitr |= newitr << 16; + } else { + newitr |= IXGBE_EITR_CNT_WDIS; + } + + /* save for next interrupt */ + que->eitr_setting = newitr; + + /* Reset state */ + rxr->bytes = 0; + rxr->packets = 0; + + return; +} + /********************************************************************* * ixgbe_msix_que - MSI-X Queue Interrupt Service routine **********************************************************************/ @@ -2117,6 +2181,11 @@ ixgbe_msix_que(void *arg) ixgbe_disable_queue(adapter, que->msix); ++que->irqs; + /* Check for AIM */ + if (adapter->enable_aim) { + ixgbe_perform_aim(adapter, que); + } + return (FILTER_SCHEDULE_THREAD); } /* ixgbe_msix_que */ @@ -2575,6 +2644,10 @@ ixgbe_add_device_sysctls(if_ctx_t ctx) adapter, 0, ixgbe_sysctl_advertise, "I", IXGBE_SYSCTL_DESC_ADV_SPEED); + adapter->enable_aim = ixgbe_enable_aim; + SYSCTL_ADD_INT(ctx_list, child, OID_AUTO, "enable_aim", CTLFLAG_RW, + &adapter->enable_aim, 0, "Interrupt Moderation"); + #ifdef IXGBE_DEBUG /* testing sysctls (for all devices) */ SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "power_state", diff --git a/sys/dev/ixgbe/ixgbe.h b/sys/dev/ixgbe/ixgbe.h index 30dd1d5368fb..31d5cc41c066 100644 --- a/sys/dev/ixgbe/ixgbe.h +++ b/sys/dev/ixgbe/ixgbe.h @@ -408,6 +408,7 @@ struct adapter { /* Info about the interface */ int advertise; /* link speeds */ + int enable_aim; /* adaptive interrupt moderation */ bool link_active; u16 num_segs; u32 link_speed;