mirror of
https://github.com/opnsense/src.git
synced 2026-05-28 04:12:45 -04:00
Implemented a more sophisticated mechanism for handling transmitter
interrupts which now defers them until the transmit queue if filled up with completed buffers. This has two advantages: first, it reduces the number of transmitter interrupts to just 1/120th of the rate that they occured previously, and two, running down many buffers at once has much improved cache effects.
This commit is contained in:
David Greenman
parent
33e929e1c4
commit
3114fdb4c0
2 changed files with 206 additions and 90 deletions
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@ -27,7 +27,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: if_fxp.c,v 1.53 1998/08/02 00:28:45 dg Exp $
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* $Id: if_fxp.c,v 1.54 1998/08/02 00:33:38 dg Exp $
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*/
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/*
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@ -243,6 +243,15 @@ static int tx_threshold = 64;
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*/
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#define FXP_NTXCB 128
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/*
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* Number of completed TX commands at which point an interrupt
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* will be generated to garbage collect the attached buffers.
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* Must be at least one less than FXP_NTXCB, and should be
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* enough less so that the transmitter doesn't becomes idle
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* during the buffer rundown (which would reduce performance).
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*/
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#define FXP_CXINT_THRESH 120
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/*
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* TxCB list index mask. This is used to do list wrap-around.
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*/
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@ -394,9 +403,10 @@ fxp_attach(parent, self, aux)
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*/
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if_attach(ifp);
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/*
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* Let the system queue as many packets as we have TX descriptors.
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* Let the system queue as many packets as we have available
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* TX descriptors.
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*/
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ifp->if_snd.ifq_maxlen = FXP_NTXCB;
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ifp->if_snd.ifq_maxlen = FXP_NTXCB - 1;
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ether_ifattach(ifp, enaddr);
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#if NBPFILTER > 0
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bpfattach(&sc->sc_ethercom.ec_if.if_bpf, ifp, DLT_EN10MB,
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@ -566,9 +576,10 @@ fxp_attach(config_id, unit)
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*/
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if_attach(ifp);
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/*
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* Let the system queue as many packets as we have TX descriptors.
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* Let the system queue as many packets as we have available
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* TX descriptors.
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*/
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ifp->if_snd.ifq_maxlen = FXP_NTXCB;
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ifp->if_snd.ifq_maxlen = FXP_NTXCB - 1;
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ether_ifattach(ifp);
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#if NBPFILTER > 0
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bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
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@ -797,8 +808,10 @@ fxp_start(ifp)
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/*
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* We're finished if there is nothing more to add to the list or if
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* we're all filled up with buffers to transmit.
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* NOTE: One TxCB is reserved to guarantee that fxp_mc_setup() can add
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* a NOP command when needed.
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*/
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while (ifp->if_snd.ifq_head != NULL && sc->tx_queued < FXP_NTXCB) {
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while (ifp->if_snd.ifq_head != NULL && sc->tx_queued < FXP_NTXCB - 1) {
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struct mbuf *m, *mb_head;
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int segment;
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@ -859,8 +872,18 @@ tbdinit:
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txp->tbd_number = segment;
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txp->mb_head = mb_head;
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txp->cb_status = 0;
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txp->cb_command =
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FXP_CB_COMMAND_XMIT | FXP_CB_COMMAND_SF | FXP_CB_COMMAND_S;
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if (sc->tx_queued != FXP_CXINT_THRESH - 1) {
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txp->cb_command =
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FXP_CB_COMMAND_XMIT | FXP_CB_COMMAND_SF | FXP_CB_COMMAND_S;
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} else {
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txp->cb_command =
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FXP_CB_COMMAND_XMIT | FXP_CB_COMMAND_SF | FXP_CB_COMMAND_S | FXP_CB_COMMAND_I;
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/*
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* Set a 5 second timer just in case we don't hear from the
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* card again.
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*/
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ifp->if_timer = 5;
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}
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txp->tx_threshold = tx_threshold;
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/*
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@ -895,12 +918,6 @@ tbdinit:
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if (txp != NULL) {
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fxp_scb_wait(sc);
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CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_SCB_COMMAND_CU_RESUME);
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/*
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* Set a 5 second timer just in case we don't hear from the
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* card again.
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*/
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ifp->if_timer = 5;
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}
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}
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@ -927,6 +944,33 @@ fxp_intr(arg)
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*/
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CSR_WRITE_1(sc, FXP_CSR_SCB_STATACK, statack);
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/*
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* Free any finished transmit mbuf chains.
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*/
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if (statack & FXP_SCB_STATACK_CXTNO) {
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struct fxp_cb_tx *txp;
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for (txp = sc->cbl_first; sc->tx_queued &&
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(txp->cb_status & FXP_CB_STATUS_C) != 0;
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txp = txp->next) {
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if (txp->mb_head != NULL) {
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m_freem(txp->mb_head);
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txp->mb_head = NULL;
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}
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sc->tx_queued--;
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}
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sc->cbl_first = txp;
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ifp->if_timer = 0;
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if (sc->tx_queued == 0) {
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if (sc->need_mcsetup)
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fxp_mc_setup(sc);
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}
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/*
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* Try to start more packets transmitting.
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*/
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if (ifp->if_snd.ifq_head != NULL)
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fxp_start(ifp);
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}
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/*
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* Process receiver interrupts. If a no-resource (RNR)
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* condition exists, get whatever packets we can and
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@ -1003,33 +1047,6 @@ rcvloop:
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FXP_SCB_COMMAND_RU_START);
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}
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}
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/*
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* Free any finished transmit mbuf chains.
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*/
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if (statack & FXP_SCB_STATACK_CNA) {
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struct fxp_cb_tx *txp;
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for (txp = sc->cbl_first; sc->tx_queued &&
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(txp->cb_status & FXP_CB_STATUS_C) != 0;
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txp = txp->next) {
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if (txp->mb_head != NULL) {
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m_freem(txp->mb_head);
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txp->mb_head = NULL;
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}
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sc->tx_queued--;
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}
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sc->cbl_first = txp;
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if (sc->tx_queued == 0) {
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ifp->if_timer = 0;
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if (sc->need_mcsetup)
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fxp_mc_setup(sc);
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}
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/*
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* Try to start more packets transmitting.
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*/
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if (ifp->if_snd.ifq_head != NULL)
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fxp_start(ifp);
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}
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}
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#if defined(__NetBSD__)
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return (claimed);
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@ -1262,7 +1279,7 @@ fxp_init(xsc)
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cbp->dma_bce = 0; /* (disable) dma max counters */
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cbp->late_scb = 0; /* (don't) defer SCB update */
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cbp->tno_int = 0; /* (disable) tx not okay interrupt */
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cbp->ci_int = 0; /* interrupt on CU not active */
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cbp->ci_int = 1; /* interrupt on CU idle */
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cbp->save_bf = prm; /* save bad frames */
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cbp->disc_short_rx = !prm; /* discard short packets */
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cbp->underrun_retry = 1; /* retry mode (1) on DMA underrun */
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@ -1691,7 +1708,7 @@ fxp_ioctl(ifp, command, data)
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*
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* We have an artificial restriction that the multicast setup command
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* must be the first command in the chain, so we take steps to ensure
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* that. By requiring this, it allows us to keep the performance of
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* this. By requiring this, it allows us to keep up the performance of
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* the pre-initialized command ring (esp. link pointers) by not actually
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* inserting the mcsetup command in the ring - i.e. its link pointer
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* points to the TxCB ring, but the mcsetup descriptor itself is not part
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@ -1709,8 +1726,49 @@ fxp_mc_setup(sc)
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struct ifmultiaddr *ifma;
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int nmcasts;
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/*
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* If there are queued commands, we must wait until they are all
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* completed. If we are already waiting, then add a NOP command
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* with interrupt option so that we're notified when all commands
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* have been completed - fxp_start() ensures that no additional
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* TX commands will be added when need_mcsetup is true.
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*/
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if (sc->tx_queued) {
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struct fxp_cb_tx *txp;
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/*
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* need_mcsetup will be true if we are already waiting for the
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* NOP command to be completed (see below). In this case, bail.
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*/
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if (sc->need_mcsetup)
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return;
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sc->need_mcsetup = 1;
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/*
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* Add a NOP command with interrupt so that we are notified when all
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* TX commands have been processed.
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*/
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txp = sc->cbl_last->next;
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txp->mb_head = NULL;
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txp->cb_status = 0;
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txp->cb_command = FXP_CB_COMMAND_NOP | FXP_CB_COMMAND_S | FXP_CB_COMMAND_I;
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/*
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* Advance the end of list forward.
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*/
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sc->cbl_last->cb_command &= ~FXP_CB_COMMAND_S;
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sc->cbl_last = txp;
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sc->tx_queued++;
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/*
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* Issue a resume in case the CU has just suspended.
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*/
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fxp_scb_wait(sc);
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CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_SCB_COMMAND_CU_RESUME);
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/*
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* Set a 5 second timer just in case we don't hear from the
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* card again.
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*/
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ifp->if_timer = 5;
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return;
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}
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sc->need_mcsetup = 0;
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@ -1721,7 +1779,7 @@ fxp_mc_setup(sc)
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mcsp->next = sc->cbl_base;
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mcsp->mb_head = NULL;
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mcsp->cb_status = 0;
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mcsp->cb_command = FXP_CB_COMMAND_MCAS | FXP_CB_COMMAND_S;
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mcsp->cb_command = FXP_CB_COMMAND_MCAS | FXP_CB_COMMAND_S | FXP_CB_COMMAND_I;
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mcsp->link_addr = vtophys(&sc->cbl_base->cb_status);
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nmcasts = 0;
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@ -1758,6 +1816,6 @@ fxp_mc_setup(sc)
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CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, vtophys(&mcsp->cb_status));
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CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_SCB_COMMAND_CU_START);
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ifp->if_timer = 5;
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ifp->if_timer = 2;
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return;
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}
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148
sys/pci/if_fxp.c
148
sys/pci/if_fxp.c
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@ -27,7 +27,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: if_fxp.c,v 1.53 1998/08/02 00:28:45 dg Exp $
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* $Id: if_fxp.c,v 1.54 1998/08/02 00:33:38 dg Exp $
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*/
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/*
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@ -243,6 +243,15 @@ static int tx_threshold = 64;
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*/
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#define FXP_NTXCB 128
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/*
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* Number of completed TX commands at which point an interrupt
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* will be generated to garbage collect the attached buffers.
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* Must be at least one less than FXP_NTXCB, and should be
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* enough less so that the transmitter doesn't becomes idle
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* during the buffer rundown (which would reduce performance).
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*/
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#define FXP_CXINT_THRESH 120
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/*
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* TxCB list index mask. This is used to do list wrap-around.
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*/
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@ -394,9 +403,10 @@ fxp_attach(parent, self, aux)
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*/
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if_attach(ifp);
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/*
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* Let the system queue as many packets as we have TX descriptors.
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* Let the system queue as many packets as we have available
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* TX descriptors.
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*/
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ifp->if_snd.ifq_maxlen = FXP_NTXCB;
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ifp->if_snd.ifq_maxlen = FXP_NTXCB - 1;
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ether_ifattach(ifp, enaddr);
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#if NBPFILTER > 0
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bpfattach(&sc->sc_ethercom.ec_if.if_bpf, ifp, DLT_EN10MB,
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@ -566,9 +576,10 @@ fxp_attach(config_id, unit)
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*/
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if_attach(ifp);
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/*
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* Let the system queue as many packets as we have TX descriptors.
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* Let the system queue as many packets as we have available
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* TX descriptors.
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*/
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ifp->if_snd.ifq_maxlen = FXP_NTXCB;
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ifp->if_snd.ifq_maxlen = FXP_NTXCB - 1;
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ether_ifattach(ifp);
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#if NBPFILTER > 0
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bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
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@ -797,8 +808,10 @@ fxp_start(ifp)
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/*
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* We're finished if there is nothing more to add to the list or if
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* we're all filled up with buffers to transmit.
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* NOTE: One TxCB is reserved to guarantee that fxp_mc_setup() can add
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* a NOP command when needed.
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*/
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while (ifp->if_snd.ifq_head != NULL && sc->tx_queued < FXP_NTXCB) {
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while (ifp->if_snd.ifq_head != NULL && sc->tx_queued < FXP_NTXCB - 1) {
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struct mbuf *m, *mb_head;
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int segment;
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@ -859,8 +872,18 @@ tbdinit:
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txp->tbd_number = segment;
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txp->mb_head = mb_head;
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txp->cb_status = 0;
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txp->cb_command =
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FXP_CB_COMMAND_XMIT | FXP_CB_COMMAND_SF | FXP_CB_COMMAND_S;
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if (sc->tx_queued != FXP_CXINT_THRESH - 1) {
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txp->cb_command =
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FXP_CB_COMMAND_XMIT | FXP_CB_COMMAND_SF | FXP_CB_COMMAND_S;
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} else {
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txp->cb_command =
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FXP_CB_COMMAND_XMIT | FXP_CB_COMMAND_SF | FXP_CB_COMMAND_S | FXP_CB_COMMAND_I;
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/*
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* Set a 5 second timer just in case we don't hear from the
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* card again.
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*/
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ifp->if_timer = 5;
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}
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txp->tx_threshold = tx_threshold;
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/*
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@ -895,12 +918,6 @@ tbdinit:
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if (txp != NULL) {
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fxp_scb_wait(sc);
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CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_SCB_COMMAND_CU_RESUME);
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/*
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* Set a 5 second timer just in case we don't hear from the
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* card again.
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*/
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ifp->if_timer = 5;
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}
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}
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@ -927,6 +944,33 @@ fxp_intr(arg)
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*/
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CSR_WRITE_1(sc, FXP_CSR_SCB_STATACK, statack);
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/*
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* Free any finished transmit mbuf chains.
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*/
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if (statack & FXP_SCB_STATACK_CXTNO) {
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struct fxp_cb_tx *txp;
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for (txp = sc->cbl_first; sc->tx_queued &&
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(txp->cb_status & FXP_CB_STATUS_C) != 0;
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txp = txp->next) {
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if (txp->mb_head != NULL) {
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m_freem(txp->mb_head);
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txp->mb_head = NULL;
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}
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sc->tx_queued--;
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}
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sc->cbl_first = txp;
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ifp->if_timer = 0;
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if (sc->tx_queued == 0) {
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if (sc->need_mcsetup)
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fxp_mc_setup(sc);
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}
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/*
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* Try to start more packets transmitting.
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*/
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if (ifp->if_snd.ifq_head != NULL)
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fxp_start(ifp);
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}
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/*
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* Process receiver interrupts. If a no-resource (RNR)
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* condition exists, get whatever packets we can and
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@ -1003,33 +1047,6 @@ rcvloop:
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FXP_SCB_COMMAND_RU_START);
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}
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}
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/*
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* Free any finished transmit mbuf chains.
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*/
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if (statack & FXP_SCB_STATACK_CNA) {
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struct fxp_cb_tx *txp;
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for (txp = sc->cbl_first; sc->tx_queued &&
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(txp->cb_status & FXP_CB_STATUS_C) != 0;
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txp = txp->next) {
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if (txp->mb_head != NULL) {
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m_freem(txp->mb_head);
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txp->mb_head = NULL;
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}
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sc->tx_queued--;
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}
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sc->cbl_first = txp;
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if (sc->tx_queued == 0) {
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ifp->if_timer = 0;
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if (sc->need_mcsetup)
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fxp_mc_setup(sc);
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}
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/*
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* Try to start more packets transmitting.
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*/
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if (ifp->if_snd.ifq_head != NULL)
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fxp_start(ifp);
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}
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}
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#if defined(__NetBSD__)
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return (claimed);
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@ -1262,7 +1279,7 @@ fxp_init(xsc)
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cbp->dma_bce = 0; /* (disable) dma max counters */
|
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cbp->late_scb = 0; /* (don't) defer SCB update */
|
||||
cbp->tno_int = 0; /* (disable) tx not okay interrupt */
|
||||
cbp->ci_int = 0; /* interrupt on CU not active */
|
||||
cbp->ci_int = 1; /* interrupt on CU idle */
|
||||
cbp->save_bf = prm; /* save bad frames */
|
||||
cbp->disc_short_rx = !prm; /* discard short packets */
|
||||
cbp->underrun_retry = 1; /* retry mode (1) on DMA underrun */
|
||||
|
|
@ -1691,7 +1708,7 @@ fxp_ioctl(ifp, command, data)
|
|||
*
|
||||
* We have an artificial restriction that the multicast setup command
|
||||
* must be the first command in the chain, so we take steps to ensure
|
||||
* that. By requiring this, it allows us to keep the performance of
|
||||
* this. By requiring this, it allows us to keep up the performance of
|
||||
* the pre-initialized command ring (esp. link pointers) by not actually
|
||||
* inserting the mcsetup command in the ring - i.e. its link pointer
|
||||
* points to the TxCB ring, but the mcsetup descriptor itself is not part
|
||||
|
|
@ -1709,8 +1726,49 @@ fxp_mc_setup(sc)
|
|||
struct ifmultiaddr *ifma;
|
||||
int nmcasts;
|
||||
|
||||
/*
|
||||
* If there are queued commands, we must wait until they are all
|
||||
* completed. If we are already waiting, then add a NOP command
|
||||
* with interrupt option so that we're notified when all commands
|
||||
* have been completed - fxp_start() ensures that no additional
|
||||
* TX commands will be added when need_mcsetup is true.
|
||||
*/
|
||||
if (sc->tx_queued) {
|
||||
struct fxp_cb_tx *txp;
|
||||
|
||||
/*
|
||||
* need_mcsetup will be true if we are already waiting for the
|
||||
* NOP command to be completed (see below). In this case, bail.
|
||||
*/
|
||||
if (sc->need_mcsetup)
|
||||
return;
|
||||
sc->need_mcsetup = 1;
|
||||
|
||||
/*
|
||||
* Add a NOP command with interrupt so that we are notified when all
|
||||
* TX commands have been processed.
|
||||
*/
|
||||
txp = sc->cbl_last->next;
|
||||
txp->mb_head = NULL;
|
||||
txp->cb_status = 0;
|
||||
txp->cb_command = FXP_CB_COMMAND_NOP | FXP_CB_COMMAND_S | FXP_CB_COMMAND_I;
|
||||
/*
|
||||
* Advance the end of list forward.
|
||||
*/
|
||||
sc->cbl_last->cb_command &= ~FXP_CB_COMMAND_S;
|
||||
sc->cbl_last = txp;
|
||||
sc->tx_queued++;
|
||||
/*
|
||||
* Issue a resume in case the CU has just suspended.
|
||||
*/
|
||||
fxp_scb_wait(sc);
|
||||
CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_SCB_COMMAND_CU_RESUME);
|
||||
/*
|
||||
* Set a 5 second timer just in case we don't hear from the
|
||||
* card again.
|
||||
*/
|
||||
ifp->if_timer = 5;
|
||||
|
||||
return;
|
||||
}
|
||||
sc->need_mcsetup = 0;
|
||||
|
|
@ -1721,7 +1779,7 @@ fxp_mc_setup(sc)
|
|||
mcsp->next = sc->cbl_base;
|
||||
mcsp->mb_head = NULL;
|
||||
mcsp->cb_status = 0;
|
||||
mcsp->cb_command = FXP_CB_COMMAND_MCAS | FXP_CB_COMMAND_S;
|
||||
mcsp->cb_command = FXP_CB_COMMAND_MCAS | FXP_CB_COMMAND_S | FXP_CB_COMMAND_I;
|
||||
mcsp->link_addr = vtophys(&sc->cbl_base->cb_status);
|
||||
|
||||
nmcasts = 0;
|
||||
|
|
@ -1758,6 +1816,6 @@ fxp_mc_setup(sc)
|
|||
CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, vtophys(&mcsp->cb_status));
|
||||
CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_SCB_COMMAND_CU_START);
|
||||
|
||||
ifp->if_timer = 5;
|
||||
ifp->if_timer = 2;
|
||||
return;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue