From nobody Mon Aug 17 00:25:51 2026 X-Original-To: dev-commits-src-branches@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4hNYXH4klTz6X1XR for ; Mon, 17 Aug 2026 00:25:51 +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 "YR2" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4hNYXH3srDz3fGn for ; Mon, 17 Aug 2026 00:25:51 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1786926351; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=WjGhmwi84sXrjEcaIoHZAGdaJlYEmGRzOqFZuFvv374=; b=Pv72GRdlYucdl8YE81r2JfGxKfJ8RKjCRWq6NPJbe6inFiVHw4y81QG0juiqrT5Iyr0BMf 9DTE3a7TnuexhROO7dlZWS2gcQWyH1jdNp3WOE2nHVaAtxpNT2Lu1p94k45gvZbtDjMxVA uP+rO0c9Uq/6N+Q5Si++8M/COz1/N1kdNmsbxlxVQlDi03gqJW0Y56lM4wM0ZAcYjH2pGG WdTW0m0KwXCDVWWtHFVQsEc2kUVdHgED685oANO1IvqYyfsuQOIktCaNA1YQ3kltwihy7d T+GR4pCO3gvVfkF9OOi03KUoyJ4FjDEArAZVSilq/fXOC5PhUV3P97O/s3nnLA== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1786926351; a=rsa-sha256; cv=none; b=NFU5ZxQ665GfK+zB1zOts+j/QhsSn7Hhx5XYM8bsSofDSffcOr3PID0VYbo8kN0uo7KCvA W/8TOL75WsT0kSrZfHDev8qgkrtVlfaH61QU3dx5YXKNWAFrR5Nygos1uwxh9UmvMoThbn wFcWXt7R1tvcMjwLR3nwOrBalZBngAx6vQqLlwhwvORpkKEvZ2Vw6BnpRyjC6IQoMPb8Xw ebcRQqTHJmXmiz1j6nXzsQsxhdQekByBhFhl/dRzm7a2S+HWGzhQe/0mBFZVkfU5Tfa0Zz +FCWfIKAHsS/gPiO8KReFz69JVe/zZpTNEVeA/+kRkcc4+e0KEEeKveHGVSvQA== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1786926351; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=WjGhmwi84sXrjEcaIoHZAGdaJlYEmGRzOqFZuFvv374=; b=LVmevDCl2iUcrw7z4svVDvimiLjcH+56ydi+NR0Z4RPYE5Pvi6QKH8YkqfZO4R6QAGWN5u xJRPo20Flqryzo2LIGQQy4rd1SmwX6pJvScVcbSoBNWDg5z2IMx4pVkXH/10EmyrwsT81M dtWQ+lDDr8+Z5ePo95awCTibEbJeBFQgnJgRtd3jah2PTzFGSeL3mWGDdtPiiTZVeGFgZj nyELV6WcAu8i5lXZkzveqAxwbsBdRLqlZEVAO1HJCckXk5ZaRVVBKIvKJ+3OuBA2XIDo9O ggHzkhz/f98zRU8ggFaO+gotfiYC6084nFpYTJs+1phe4f64cvm3z+IgOBADyw== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4hNYXH2dFwzrg4 for ; Mon, 17 Aug 2026 00:25:51 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 37d26 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Mon, 17 Aug 2026 00:25:51 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Kevin Bowling Subject: git: 3fab6b25469a - stable/15 - igc: Work around I225 v1 minimum IPG erratum List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kbowling X-Git-Repository: src X-Git-Refname: refs/heads/stable/15 X-Git-Reftype: branch X-Git-Commit: 3fab6b25469a8eb3f49c933079bf42c5c13c0081 Auto-Submitted: auto-generated Date: Mon, 17 Aug 2026 00:25:51 +0000 Message-Id: <6a82550f.37d26.46d5ab0e@gitrepo.freebsd.org> The branch stable/15 has been updated by kbowling: URL: https://cgit.FreeBSD.org/src/commit/?id=3fab6b25469a8eb3f49c933079bf42c5c13c0081 commit 3fab6b25469a8eb3f49c933079bf42c5c13c0081 Author: Kevin Bowling AuthorDate: 2026-08-03 10:28:49 +0000 Commit: Kevin Bowling CommitDate: 2026-08-17 00:25:10 +0000 igc: Work around I225 v1 minimum IPG erratum I225 v1 cannot receive the minimum inter-packet gap required at 2.5 Gb/s. For affected back-to-back links, Intel recommends using a 15-byte transmit IPG instead of 12 bytes. Program TIPG.IPGT to 0xb for pre-v2 I225 devices at 2.5 Gb/s and restore the default at lower speeds. Avoid penalizing fixed I225 and I226 parts. (cherry picked from commit 709426551c6a3607fb5a33f5b8dbb87cfa9c8125) --- sys/dev/igc/if_igc.c | 29 +++++++++++++++++++++++++++++ sys/dev/igc/igc_defines.h | 1 + 2 files changed, 30 insertions(+) diff --git a/sys/dev/igc/if_igc.c b/sys/dev/igc/if_igc.c index c49948f7c57e..17784f5f5f43 100644 --- a/sys/dev/igc/if_igc.c +++ b/sys/dev/igc/if_igc.c @@ -129,6 +129,7 @@ static int igc_if_rx_queue_intr_enable(if_ctx_t, uint16_t); static int igc_if_tx_queue_intr_enable(if_ctx_t, uint16_t); static void igc_if_multi_set(if_ctx_t); static void igc_if_update_admin_status(if_ctx_t); +static void igc_apply_i225_ipg_workaround(struct igc_softc *); static void igc_if_debug(if_ctx_t); static void igc_update_stats_counters(struct igc_softc *); static void igc_add_hw_stats(struct igc_softc *); @@ -1397,6 +1398,33 @@ igc_if_timer(if_ctx_t ctx, uint16_t qid) iflib_admin_intr_deferred(ctx); } +static void +igc_apply_i225_ipg_workaround(struct igc_softc *sc) +{ + struct igc_hw *hw = &sc->hw; + u32 ipgt, tipg; + + /* + * I225 v1 cannot receive the minimum IPG required at 2.5 Gb/s. + * Intel's documented back-to-back workaround is for the transmitter + * to use a 15-byte IPG instead of 12 bytes. I225 v2 and later have + * the receive-side fix and should retain the standard IPG. + */ + if (!igc_is_device_id_i225(hw) || + hw->revision_id >= IGC_REVISION_2) + return; + + ipgt = sc->link_speed == SPEED_2500 ? IGC_I225_TIPG_IPGT_2P5 : + DEFAULT_82543_TIPG_IPGT_COPPER; + tipg = IGC_READ_REG(hw, IGC_TIPG); + if ((tipg & IGC_TIPG_IPGT_MASK) == ipgt) + return; + + tipg &= ~IGC_TIPG_IPGT_MASK; + tipg |= ipgt; + IGC_WRITE_REG(hw, IGC_TIPG, tipg); +} + static void igc_if_update_admin_status(if_ctx_t ctx) { @@ -1442,6 +1470,7 @@ igc_if_update_admin_status(if_ctx_t ctx) sc->link_active = 0; iflib_link_state_change(ctx, LINK_STATE_DOWN, 0); } + igc_apply_i225_ipg_workaround(sc); igc_update_stats_counters(sc); } diff --git a/sys/dev/igc/igc_defines.h b/sys/dev/igc/igc_defines.h index 09f75fe2787e..3e6309176204 100644 --- a/sys/dev/igc/igc_defines.h +++ b/sys/dev/igc/igc_defines.h @@ -364,6 +364,7 @@ /* Default values for the transmit IPG register */ #define DEFAULT_82543_TIPG_IPGT_FIBER 9 #define DEFAULT_82543_TIPG_IPGT_COPPER 8 +#define IGC_I225_TIPG_IPGT_2P5 0xB #define IGC_TIPG_IPGT_MASK 0x000003FF