thanks, go ahead
On Tue, Mar 30, 2021 at 9:52 AM Vijay Kumar Banerjee <vi...@rtems.org> wrote: > > From: Daniel Hellstrom <dan...@gaisler.com> > > The descriptor table size is equal to its alignment and set when > configuring the HW IP through VHDL generics. This SW patch simply > probes the HW how large the RX/TX descriptor tables are and adjusts > accordingly. > > The number of descriptors actual used are controlled by other > settings (rxDescs and txDescs) controlled by the user. > --- > bsps/shared/grlib/net/greth.c | 22 +++++++++++++++------- > 1 file changed, 15 insertions(+), 7 deletions(-) > > diff --git a/bsps/shared/grlib/net/greth.c b/bsps/shared/grlib/net/greth.c > index 8b19b48..84efcd7 100644 > --- a/bsps/shared/grlib/net/greth.c > +++ b/bsps/shared/grlib/net/greth.c > @@ -187,6 +187,7 @@ struct greth_softc > unsigned int advmodes; /* advertise ethernet speed modes. 0 = all modes. > */ > struct timespec auto_neg_time; > int mc_available; > + int num_descs; > > /* > * Statistics > @@ -423,7 +424,7 @@ greth_initialize_hardware (struct greth_softc *sc) > int tmp2; > struct timespec tstart, tnow; > greth_regs *regs; > - unsigned int advmodes, speed; > + unsigned int advmodes, speed, tabsize; > > regs = sc->regs; > > @@ -617,8 +618,9 @@ auto_neg_done: > /* Initialize rx/tx descriptor table pointers. Due to alignment we > * always allocate maximum table size. > */ > - sc->txdesc = (greth_rxtxdesc *) almalloc(0x800, 0x400); > - sc->rxdesc = (greth_rxtxdesc *) &sc->txdesc[128]; > + tabsize = sc->num_descs * 8; > + sc->txdesc = (greth_rxtxdesc *) almalloc(tabsize * 2, tabsize); > + sc->rxdesc = (greth_rxtxdesc *) (tabsize + (void *)sc->txdesc); > sc->tx_ptr = 0; > sc->tx_dptr = 0; > sc->tx_cnt = 0; > @@ -632,8 +634,8 @@ auto_neg_done: > CPUMEM_TO_DMA, > (void *)sc->txdesc, > (void **)&sc->txdesc_remote, > - 0x800); > - sc->rxdesc_remote = sc->txdesc_remote + 0x400; > + tabsize * 2); > + sc->rxdesc_remote = sc->txdesc_remote + tabsize; > regs->txdesc = (int) sc->txdesc_remote; > regs->rxdesc = (int) sc->rxdesc_remote; > > @@ -1555,6 +1557,7 @@ int greth_device_init(struct greth_softc *sc) > struct ambapp_core *pnpinfo; > union drvmgr_key_value *value; > unsigned int speed; > + int i, nrd; > > /* Get device information from AMBA PnP information */ > ambadev = (struct amba_dev_info *)sc->dev->businfo; > @@ -1608,12 +1611,17 @@ int greth_device_init(struct greth_softc *sc) > sc->rxbufs = 32; > sc->phyaddr = -1; > > + /* Probe the number of descriptors available the */ > + nrd = (sc->regs->status & GRETH_STATUS_NRD) >> 24; > + for (sc->num_descs = 128, i = 0; i < nrd; i++) > + sc->num_descs = sc->num_descs * 2; > + > value = drvmgr_dev_key_get(sc->dev, "txDescs", DRVMGR_KT_INT); > - if ( value && (value->i <= 128) ) > + if ( value && (value->i <= sc->num_descs) ) > sc->txbufs = value->i; > > value = drvmgr_dev_key_get(sc->dev, "rxDescs", DRVMGR_KT_INT); > - if ( value && (value->i <= 128) ) > + if ( value && (value->i <= sc->num_descs) ) > sc->rxbufs = value->i; > > value = drvmgr_dev_key_get(sc->dev, "phyAdr", DRVMGR_KT_INT); > -- > 2.26.2 > > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
