drivers/net/ethernet/chelsio/cxgb3/vsc8211.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/chelsio/cxgb3/vsc8211.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/chelsio/cxgb3/vsc8211.c
Extension
.c
Size
11686 bytes
Lines
417
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (fc && dplx == DUPLEX_FULL) {
			err = t3_mdio_read(cphy, MDIO_DEVAD_NONE, MII_LPA,
					   &lpa);
			if (!err)
				err = t3_mdio_read(cphy, MDIO_DEVAD_NONE,
						   MII_ADVERTISE, &adv);
			if (err)
				return err;

			if (lpa & adv & ADVERTISE_PAUSE_CAP)
				pause = PAUSE_RX | PAUSE_TX;
			else if ((lpa & ADVERTISE_PAUSE_CAP) &&
				 (lpa & ADVERTISE_PAUSE_ASYM) &&
				 (adv & ADVERTISE_PAUSE_ASYM))
				pause = PAUSE_TX;
			else if ((lpa & ADVERTISE_PAUSE_ASYM) &&
				 (adv & ADVERTISE_PAUSE_CAP))
				pause = PAUSE_RX;
		}
	}
	if (speed)
		*speed = sp;
	if (duplex)
		*duplex = dplx;
	if (fc)
		*fc = pause;
	return 0;
}

static int vsc8211_get_link_status_fiber(struct cphy *cphy, int *link_ok,
					 int *speed, int *duplex, int *fc)
{
	unsigned int bmcr, status, lpa, adv;
	int err, sp = -1, dplx = -1, pause = 0;

	err = t3_mdio_read(cphy, MDIO_DEVAD_NONE, MII_BMCR, &bmcr);
	if (!err)
		err = t3_mdio_read(cphy, MDIO_DEVAD_NONE, MII_BMSR, &status);
	if (err)
		return err;

	if (link_ok) {
		/*
		 * BMSR_LSTATUS is latch-low, so if it is 0 we need to read it
		 * once more to get the current link state.
		 */
		if (!(status & BMSR_LSTATUS))
			err = t3_mdio_read(cphy, MDIO_DEVAD_NONE, MII_BMSR,
					   &status);
		if (err)
			return err;
		*link_ok = (status & BMSR_LSTATUS) != 0;
	}
	if (!(bmcr & BMCR_ANENABLE)) {
		dplx = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF;
		if (bmcr & BMCR_SPEED1000)
			sp = SPEED_1000;
		else if (bmcr & BMCR_SPEED100)
			sp = SPEED_100;
		else
			sp = SPEED_10;
	} else if (status & BMSR_ANEGCOMPLETE) {
		err = t3_mdio_read(cphy, MDIO_DEVAD_NONE, MII_LPA, &lpa);
		if (!err)
			err = t3_mdio_read(cphy, MDIO_DEVAD_NONE, MII_ADVERTISE,
					   &adv);
		if (err)
			return err;

		if (adv & lpa & ADVERTISE_1000XFULL) {
			dplx = DUPLEX_FULL;
			sp = SPEED_1000;
		} else if (adv & lpa & ADVERTISE_1000XHALF) {
			dplx = DUPLEX_HALF;
			sp = SPEED_1000;
		}

		if (fc && dplx == DUPLEX_FULL) {
			if (lpa & adv & ADVERTISE_1000XPAUSE)
				pause = PAUSE_RX | PAUSE_TX;
			else if ((lpa & ADVERTISE_1000XPAUSE) &&
				 (adv & lpa & ADVERTISE_1000XPSE_ASYM))
				pause = PAUSE_TX;
			else if ((lpa & ADVERTISE_1000XPSE_ASYM) &&
				 (adv & ADVERTISE_1000XPAUSE))
				pause = PAUSE_RX;
		}
	}
	if (speed)
		*speed = sp;

Annotation

Implementation Notes