drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
Extension
.c
Size
19277 bytes
Lines
738
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

switch (ets->tc_tsa[i]) {
		case IEEE_8021QAZ_TSA_STRICT:
			break;
		case IEEE_8021QAZ_TSA_ETS:
			has_ets_tc = true;
			tx_bw_sum += ets->tc_tx_bw[i];
			break;
		default:
			netdev_err(dev, "Only strict priority and ETS are supported\n");
			return -EINVAL;
		}

		if (ets->prio_tc[i] >= IEEE_8021QAZ_MAX_TCS) {
			netdev_err(dev, "Invalid TC\n");
			return -EINVAL;
		}
	}

	if (has_ets_tc && tx_bw_sum != 100) {
		netdev_err(dev, "Total ETS bandwidth should equal 100\n");
		return -EINVAL;
	}

	return 0;
}

static int mlxsw_sp_port_headroom_ets_set(struct mlxsw_sp_port *mlxsw_sp_port,
					  struct ieee_ets *ets)
{
	struct net_device *dev = mlxsw_sp_port->dev;
	struct mlxsw_sp_hdroom hdroom;
	int prio;
	int err;

	hdroom = *mlxsw_sp_port->hdroom;
	for (prio = 0; prio < IEEE_8021QAZ_MAX_TCS; prio++)
		hdroom.prios.prio[prio].ets_buf_idx = ets->prio_tc[prio];
	mlxsw_sp_hdroom_prios_reset_buf_idx(&hdroom);
	mlxsw_sp_hdroom_bufs_reset_lossiness(&hdroom);
	mlxsw_sp_hdroom_bufs_reset_sizes(mlxsw_sp_port, &hdroom);

	err = mlxsw_sp_hdroom_configure(mlxsw_sp_port, &hdroom);
	if (err) {
		netdev_err(dev, "Failed to configure port's headroom\n");
		return err;
	}

	return 0;
}

static int __mlxsw_sp_dcbnl_ieee_setets(struct mlxsw_sp_port *mlxsw_sp_port,
					struct ieee_ets *ets)
{
	struct ieee_ets *my_ets = mlxsw_sp_port->dcb.ets;
	struct net_device *dev = mlxsw_sp_port->dev;
	int i, err;

	/* Egress configuration. */
	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
		bool dwrr = ets->tc_tsa[i] == IEEE_8021QAZ_TSA_ETS;
		u8 weight = ets->tc_tx_bw[i];

		err = mlxsw_sp_port_ets_set(mlxsw_sp_port,
					    MLXSW_REG_QEEC_HR_SUBGROUP, i,
					    0, dwrr, weight);
		if (err) {
			netdev_err(dev, "Failed to link subgroup ETS element %d to group\n",
				   i);
			goto err_port_ets_set;
		}
	}

	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
		err = mlxsw_sp_port_prio_tc_set(mlxsw_sp_port, i,
						ets->prio_tc[i]);
		if (err) {
			netdev_err(dev, "Failed to map prio %d to TC %d\n", i,
				   ets->prio_tc[i]);
			goto err_port_prio_tc_set;
		}
	}

	/* Ingress configuration. */
	err = mlxsw_sp_port_headroom_ets_set(mlxsw_sp_port, ets);
	if (err)
		goto err_port_headroom_set;

	return 0;

err_port_headroom_set:

Annotation

Implementation Notes