drivers/net/ethernet/sun/sunvnet_common.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/sun/sunvnet_common.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/sun/sunvnet_common.c
Extension
.c
Size
46072 bytes
Lines
1815
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 (port->rmtu) {
			port->rmtu = min(VNET_MAXPACKET, port->rmtu);
			pkt.mtu = port->rmtu;
		} else {
			port->rmtu = VNET_MAXPACKET;
			pkt.mtu = port->rmtu;
		}
		if (vio_version_after_eq(vio, 1, 6))
			pkt.options = VIO_TX_DRING;
	} else if (vio_version_before(vio, 1, 3)) {
		pkt.mtu = framelen;
	} else { /* v1.3 */
		pkt.mtu = framelen + VLAN_HLEN;
	}

	pkt.cflags = 0;
	if (vio_version_after_eq(vio, 1, 7) && port->tso) {
		pkt.cflags |= VNET_LSO_IPV4_CAPAB;
		if (!port->tsolen)
			port->tsolen = VNET_MAXTSO;
		pkt.ipv4_lso_maxlen = port->tsolen;
	}

	pkt.plnk_updt = PHYSLINK_UPDATE_NONE;

	viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
	       "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
	       "cflags[0x%04x] lso_max[%u]\n",
	       pkt.xfer_mode, pkt.addr_type,
	       (unsigned long long)pkt.addr,
	       pkt.ack_freq, pkt.plnk_updt, pkt.options,
	       (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);

	return vio_ldc_send(vio, &pkt, sizeof(pkt));
}
EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);

static int handle_attr_info(struct vio_driver_state *vio,
			    struct vio_net_attr_info *pkt)
{
	struct vnet_port *port = to_vnet_port(vio);
	u64	localmtu;
	u8	xfer_mode;

	viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
	       "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
	       " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
	       pkt->xfer_mode, pkt->addr_type,
	       (unsigned long long)pkt->addr,
	       pkt->ack_freq, pkt->plnk_updt, pkt->options,
	       (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
	       pkt->ipv4_lso_maxlen);

	pkt->tag.sid = vio_send_sid(vio);

	xfer_mode = pkt->xfer_mode;
	/* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
	if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
		xfer_mode = VIO_NEW_DRING_MODE;

	/* MTU negotiation:
	 *	< v1.3 - ETH_FRAME_LEN exactly
	 *	> v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
	 *			pkt->mtu for ACK
	 *	= v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
	 */
	if (vio_version_before(vio, 1, 3)) {
		localmtu = ETH_FRAME_LEN;
	} else if (vio_version_after(vio, 1, 3)) {
		localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
		localmtu = min(pkt->mtu, localmtu);
		pkt->mtu = localmtu;
	} else { /* v1.3 */
		localmtu = ETH_FRAME_LEN + VLAN_HLEN;
	}
	port->rmtu = localmtu;

	/* LSO negotiation */
	if (vio_version_after_eq(vio, 1, 7))
		port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
	else
		port->tso = false;
	if (port->tso) {
		if (!port->tsolen)
			port->tsolen = VNET_MAXTSO;
		port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
		if (port->tsolen < VNET_MINTSO) {
			port->tso = false;
			port->tsolen = 0;
			pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;

Annotation

Implementation Notes