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ffec: Add interrupt coalescing support
Code is an adapted from the TSEC (if_tsec) network interface driver. Update #3090.
This commit is contained in:
Sebastian Huber
parent
fd5ee57372
commit
0323c286e3
@ -2,6 +2,8 @@
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/*-
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* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
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* Copyright (C) 2007-2008 Semihalf, Rafal Jaworowski
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* Copyright (C) 2006-2007 Semihalf, Piotr Kruszynski
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -138,6 +140,10 @@ static struct ofw_compat_data compat_data[] = {
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#define MAX_IRQ_COUNT 3
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/* Interrupt Coalescing types */
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#define FEC_IC_RX 0
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#define FEC_IC_TX 1
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struct ffec_bufmap {
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struct mbuf *mbuf;
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bus_dmamap_t map;
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@ -188,6 +194,12 @@ struct ffec_softc {
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struct ffec_bufmap txbuf_map[TX_DESC_COUNT];
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uint32_t tx_idx_head;
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uint32_t tx_idx_tail;
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/* interrupt coalescing */
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int rx_ic_time; /* RW, valid values 0..65535 */
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int rx_ic_count; /* RW, valid values 0..255 */
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int tx_ic_time;
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int tx_ic_count;
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};
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#define FFEC_LOCK(sc) mtx_lock(&(sc)->mtx)
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@ -204,6 +216,13 @@ static void ffec_encap(struct ifnet *ifp, struct ffec_softc *sc,
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struct mbuf *m0, int *start_tx);
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static void ffec_txstart_locked(struct ffec_softc *sc);
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static void ffec_txfinish_locked(struct ffec_softc *sc);
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static void ffec_add_sysctls(struct ffec_softc *sc);
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static int ffec_sysctl_ic_time(SYSCTL_HANDLER_ARGS);
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static int ffec_sysctl_ic_count(SYSCTL_HANDLER_ARGS);
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static void ffec_set_ic(struct ffec_softc *sc, bus_size_t off, int count,
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int time);
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static void ffec_set_rxic(struct ffec_softc *sc);
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static void ffec_set_txic(struct ffec_softc *sc);
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static inline uint16_t
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RD2(struct ffec_softc *sc, bus_size_t off)
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@ -1302,6 +1321,9 @@ ffec_init_locked(struct ffec_softc *sc)
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* available in ffec_attach() or ffec_stop().
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*/
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WR4(sc, FEC_RDAR_REG, FEC_RDAR_RDAR);
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ffec_set_rxic(sc);
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ffec_set_txic(sc);
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}
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static void
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@ -1495,6 +1517,151 @@ ffec_detach(device_t dev)
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return (0);
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}
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static void
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ffec_add_sysctls(struct ffec_softc *sc)
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{
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struct sysctl_ctx_list *ctx;
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struct sysctl_oid_list *children;
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struct sysctl_oid *tree;
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ctx = device_get_sysctl_ctx(sc->dev);
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children = SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev));
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tree = SYSCTL_ADD_NODE(ctx, children, OID_AUTO, "int_coal",
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CTLFLAG_RD, 0, "FEC Interrupts coalescing");
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children = SYSCTL_CHILDREN(tree);
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SYSCTL_ADD_PROC(ctx, children, OID_AUTO, "rx_time",
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CTLTYPE_UINT | CTLFLAG_RW, sc, FEC_IC_RX, ffec_sysctl_ic_time,
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"I", "IC RX time threshold (0-65535)");
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SYSCTL_ADD_PROC(ctx, children, OID_AUTO, "rx_count",
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CTLTYPE_UINT | CTLFLAG_RW, sc, FEC_IC_RX, ffec_sysctl_ic_count,
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"I", "IC RX frame count threshold (0-255)");
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SYSCTL_ADD_PROC(ctx, children, OID_AUTO, "tx_time",
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CTLTYPE_UINT | CTLFLAG_RW, sc, FEC_IC_TX, ffec_sysctl_ic_time,
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"I", "IC TX time threshold (0-65535)");
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SYSCTL_ADD_PROC(ctx, children, OID_AUTO, "tx_count",
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CTLTYPE_UINT | CTLFLAG_RW, sc, FEC_IC_TX, ffec_sysctl_ic_count,
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"I", "IC TX frame count threshold (0-255)");
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}
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/*
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* With Interrupt Coalescing (IC) active, a transmit/receive frame
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* interrupt is raised either upon:
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*
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* - threshold-defined period of time elapsed, or
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* - threshold-defined number of frames is received/transmitted,
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* whichever occurs first.
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*
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* The following sysctls regulate IC behaviour (for TX/RX separately):
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*
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* dev.tsec.<unit>.int_coal.rx_time
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* dev.tsec.<unit>.int_coal.rx_count
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* dev.tsec.<unit>.int_coal.tx_time
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* dev.tsec.<unit>.int_coal.tx_count
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*
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* Values:
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*
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* - 0 for either time or count disables IC on the given TX/RX path
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*
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* - count: 1-255 (expresses frame count number; note that value of 1 is
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* effectively IC off)
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*
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* - time: 1-65535 (value corresponds to a real time period and is
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* expressed in units equivalent to 64 FEC interface clocks, i.e. one timer
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* threshold unit is 26.5 us, 2.56 us, or 512 ns, corresponding to 10 Mbps,
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* 100 Mbps, or 1Gbps, respectively. For detailed discussion consult the
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* FEC reference manual.
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*/
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static int
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ffec_sysctl_ic_time(SYSCTL_HANDLER_ARGS)
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{
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int error;
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uint32_t time;
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struct ffec_softc *sc = (struct ffec_softc *)arg1;
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time = (arg2 == FEC_IC_RX) ? sc->rx_ic_time : sc->tx_ic_time;
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error = sysctl_handle_int(oidp, &time, 0, req);
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if (error != 0)
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return (error);
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if (time > 65535)
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return (EINVAL);
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FFEC_LOCK(sc);
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if (arg2 == FEC_IC_RX) {
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sc->rx_ic_time = time;
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ffec_set_rxic(sc);
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} else {
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sc->tx_ic_time = time;
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ffec_set_txic(sc);
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}
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FFEC_UNLOCK(sc);
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return (0);
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}
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static int
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ffec_sysctl_ic_count(SYSCTL_HANDLER_ARGS)
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{
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int error;
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uint32_t count;
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struct ffec_softc *sc = (struct ffec_softc *)arg1;
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count = (arg2 == FEC_IC_RX) ? sc->rx_ic_count : sc->tx_ic_count;
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error = sysctl_handle_int(oidp, &count, 0, req);
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if (error != 0)
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return (error);
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if (count > 255)
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return (EINVAL);
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FFEC_LOCK(sc);
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if (arg2 == FEC_IC_RX) {
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sc->rx_ic_count = count;
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ffec_set_rxic(sc);
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} else {
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sc->tx_ic_count = count;
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ffec_set_txic(sc);
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}
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FFEC_UNLOCK(sc);
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return (0);
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}
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static void
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ffec_set_ic(struct ffec_softc *sc, bus_size_t off, int count, int time)
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{
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uint32_t ic;
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if (count == 0 || time == 0)
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/* Disable RX IC */
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ic = 0;
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else {
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ic = FEC_IC_ICEN;
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ic |= FEC_IC_ICFT(count);
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ic |= FEC_IC_ICTT(time);
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}
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WR4(sc, off, ic);
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}
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static void
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ffec_set_rxic(struct ffec_softc *sc)
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{
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ffec_set_ic(sc, FEC_RXIC0_REG, sc->rx_ic_count, sc->rx_ic_time);
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}
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static void
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ffec_set_txic(struct ffec_softc *sc)
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{
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ffec_set_ic(sc, FEC_TXIC0_REG, sc->tx_ic_count, sc->tx_ic_time);
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}
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static int
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ffec_attach(device_t dev)
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{
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@ -1781,6 +1948,14 @@ ffec_attach(device_t dev)
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}
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WR4(sc, FEC_MSCR_REG, mscr);
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/* Configure defaults for interrupts coalescing */
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sc->rx_ic_time = 768;
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sc->rx_ic_count = RX_DESC_COUNT / 4;
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sc->tx_ic_time = 768;
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sc->tx_ic_count = TX_DESC_COUNT / 4;
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ffec_add_sysctls(sc);
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/* Set up the ethernet interface. */
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sc->ifp = ifp = if_alloc(IFT_ETHER);
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@ -143,6 +143,17 @@ __FBSDID("$FreeBSD$");
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#define FEC_OPD_PAUSE_DUR_SHIFT 0
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#define FEC_OPD_PAUSE_DUR_MASK (0xffff << FEC_OPD_PAUSE_DUR_SHIFT)
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#define FEC_TXIC0_REG 0x00f0
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#define FEC_TXIC1_REG 0x00f4
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#define FEC_TXIC2_REG 0x00f8
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#define FEC_RXIC0_REG 0x0100
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#define FEC_RXIC1_REG 0x0104
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#define FEC_RXIC2_REG 0x0108
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#define FEC_IC_ICEN (1 << 31)
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#define FEC_IC_ICCS (1 << 30)
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#define FEC_IC_ICFT(x) (((x) & 0xff) << 20)
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#define FEC_IC_ICTT(x) ((x) & 0xffff)
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#define FEC_IAUR_REG 0x0118
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#define FEC_IALR_REG 0x011c
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