Date: Sun, 26 Jul 2026 01:01:09 +0000 From: Kevin Bowling <kbowling@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 6ef368a29b11 - main - e1000: synchronize interrupt moderation state Message-ID: <6a655c55.31fec.4025fc65@gitrepo.freebsd.org>
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The branch main has been updated by kbowling: URL: https://cgit.FreeBSD.org/src/commit/?id=6ef368a29b11ebc769e7929566809b75ae2c1e90 commit 6ef368a29b11ebc769e7929566809b75ae2c1e90 Author: Kevin Bowling <kbowling@FreeBSD.org> AuthorDate: 2026-07-25 23:49:03 +0000 Commit: Kevin Bowling <kbowling@FreeBSD.org> CommitDate: 2026-07-26 01:00:02 +0000 e1000: synchronize interrupt moderation state Keep the saved EITR and PBA values synchronized with hardware across reinitialization. Correct EITR encoding, decoding, and MSI-X register selection, and reject nonpositive fallback rates. Treat only sub-gigabit links as sub-gigabit and apply the packet-buffer fallback without permanently disabling AIM. MFC after: 1 week --- sys/dev/e1000/if_em.c | 56 +++++++++++++++++++++++++++++++++------------------ sys/dev/e1000/if_em.h | 6 ++++-- 2 files changed, 40 insertions(+), 22 deletions(-) diff --git a/sys/dev/e1000/if_em.c b/sys/dev/e1000/if_em.c index 3fa5a7ed9a5b..40a5e9f75de9 100644 --- a/sys/dev/e1000/if_em.c +++ b/sys/dev/e1000/if_em.c @@ -496,6 +496,7 @@ static int em_get_regs(SYSCTL_HANDLER_ARGS); static void lem_smartspeed(struct e1000_softc *); static void igb_configure_queues(struct e1000_softc *); +static void igb_initialize_interrupt_rate(struct e1000_softc *); static void em_flush_desc_rings(struct e1000_softc *); @@ -968,6 +969,13 @@ em_if_attach_pre(if_ctx_t ctx) dev = iflib_get_dev(ctx); sc = iflib_get_softc(ctx); + if (em_max_interrupt_rate <= 0) { + device_printf(dev, + "Invalid max_interrupt_rate %d; using default %d\n", + em_max_interrupt_rate, EM_INTS_DEFAULT); + em_max_interrupt_rate = EM_INTS_DEFAULT; + } + sc->ctx = sc->osdep.ctx = ctx; sc->dev = sc->osdep.dev = dev; scctx = sc->shared = iflib_get_softc_ctx(ctx); @@ -1622,6 +1630,8 @@ em_if_init(if_ctx_t ctx) /* Set up queue routing */ igb_configure_queues(sc); } + if (sc->hw.mac.type >= igb_mac_min) + igb_initialize_interrupt_rate(sc); /* this clears any pending interrupts */ E1000_READ_REG(&sc->hw, E1000_ICR); @@ -1732,14 +1742,13 @@ em_newitr(struct e1000_softc *sc, struct em_rx_queue *que, nextlatency = rxr->rx_nextlatency; /* Use half default (4K) ITR if sub-gig */ - if (sc->link_speed != 1000) { + if (sc->link_speed < SPEED_1000) { newitr = EM_INTS_4K; goto em_set_next_itr; } /* Want at least enough packet buffer for two frames to AIM */ if (sc->shared->isc_max_frame_size * 2 > (sc->pba << 10)) { newitr = em_max_interrupt_rate; - sc->enable_aim = 0; goto em_set_next_itr; } @@ -2627,7 +2636,7 @@ igb_configure_queues(struct e1000_softc *sc) struct e1000_hw *hw = &sc->hw; struct em_rx_queue *rx_que; struct em_tx_queue *tx_que; - u32 tmp, ivar = 0, newitr = 0; + u32 tmp, ivar = 0; /* First turn on RSS capability */ if (hw->mac.type != e1000_82575) @@ -2751,22 +2760,28 @@ igb_configure_queues(struct e1000_softc *sc) break; } - /* Set the igb starting interrupt rate */ - if (em_max_interrupt_rate > 0) { - newitr = IGB_INTS_TO_EITR(em_max_interrupt_rate); + return; +} - if (hw->mac.type == e1000_82575) - newitr |= newitr << 16; - else - newitr |= E1000_EITR_CNT_IGNR; +static void +igb_initialize_interrupt_rate(struct e1000_softc *sc) +{ + struct e1000_hw *hw = &sc->hw; + struct em_rx_queue *rx_que; + u32 newitr; - for (int i = 0; i < sc->rx_num_queues; i++) { - rx_que = &sc->rx_queues[i]; - E1000_WRITE_REG(hw, E1000_EITR(rx_que->msix), newitr); - } - } + newitr = IGB_INTS_TO_EITR(em_max_interrupt_rate); + if (hw->mac.type == e1000_82575) + newitr |= newitr << 16; + else + newitr |= E1000_EITR_CNT_IGNR; - return; + for (int i = 0; i < sc->rx_num_queues; i++) { + rx_que = &sc->rx_queues[i]; + rx_que->itr_setting = newitr; + E1000_WRITE_REG(hw, E1000_EITR(rx_que->msix), + rx_que->itr_setting); + } } static void @@ -3300,9 +3315,10 @@ em_reset(if_ctx_t ctx) hw->fc.refresh_time = 0xFFFF; /* Jumbos need adjusted PBA */ if (if_getmtu(ifp) > ETHERMTU) - E1000_WRITE_REG(hw, E1000_PBA, 12); + pba = E1000_PBA_12K; else - E1000_WRITE_REG(hw, E1000_PBA, 26); + pba = E1000_PBA_26K; + E1000_WRITE_REG(hw, E1000_PBA, pba); break; case e1000_82575: case e1000_82576: @@ -5017,7 +5033,7 @@ em_sysctl_interrupt_rate_handler(SYSCTL_HANDLER_ARGS) tque = oidp->oid_arg1; hw = &tque->sc->hw; if (hw->mac.type >= igb_mac_min) - reg = E1000_READ_REG(hw, E1000_EITR(tque->me)); + reg = E1000_READ_REG(hw, E1000_EITR(tque->msix)); else if (hw->mac.type == e1000_82574 && tque->sc->intr_type == IFLIB_INTR_MSIX) reg = E1000_READ_REG(hw, E1000_EITR_82574(tque->msix)); @@ -5044,7 +5060,7 @@ em_sysctl_interrupt_rate_handler(SYSCTL_HANDLER_ARGS) } else { usec = (reg & IGB_QVECTOR_MASK); if (usec > 0) - rate = IGB_INTS_TO_EITR(usec); + rate = IGB_EITR_TO_INTS(usec); else rate = 0; } diff --git a/sys/dev/e1000/if_em.h b/sys/dev/e1000/if_em.h index 007f5f42d5a7..594399498db3 100644 --- a/sys/dev/e1000/if_em.h +++ b/sys/dev/e1000/if_em.h @@ -253,8 +253,10 @@ #define IGB_EITR_DIVIDEND 1000000 #define IGB_EITR_SHIFT 2 #define IGB_QVECTOR_MASK 0x7FFC -#define IGB_INTS_TO_EITR(i) (((IGB_EITR_DIVIDEND/i) & IGB_QVECTOR_MASK) << \ - IGB_EITR_SHIFT) +#define IGB_INTS_TO_EITR(i) \ + (((IGB_EITR_DIVIDEND / (i)) << IGB_EITR_SHIFT) & IGB_QVECTOR_MASK) +#define IGB_EITR_TO_INTS(i) ((IGB_EITR_DIVIDEND << IGB_EITR_SHIFT) / \ + ((i) & IGB_QVECTOR_MASK)) #define IGB_LINK_ITR 2000 #define I210_LINK_DELAY 1000home | help
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