Driver Design

The driver is implemented as a PCIe network device driver. The driver configures the CMAC, QDMA and STM-N components in the hardware design for performing packet reception and transmission. Each of these components have a set of APIs which are called from the network driver callback APIs registered with the Linux network subsystem.

CMAC APIs can be found in linux-kernel/driver/cmac folder

QDMA APIs can be found in linux-kernel/driver/qdma folder

STM-N APIs can be found in linux-kernel/driver/stmn folder

The below network device operations are implemented in linux-kernel/driver/qep.c

static const struct net_device_ops qep_netdev_ops = {
.ndo_open = qep_open,
.ndo_stop = qep_stop,
.ndo_start_xmit = qep_start_xmit,
.ndo_select_queue = qep_select_queue,
.ndo_get_stats64 = qep_get_stats64,
.ndo_change_mtu = qep_change_mtu
};

The following ethtool operations supported by the driver are implemented in linux-kernel/driver/qep_ethtool.c:

static const struct ethtool_ops qep_ethtool_ops = {
.get_drvinfo            = qep_get_drvinfo,
.get_regs_len           = qep_get_regs_len,
.get_regs               = qep_get_regs,
.get_link               = ethtool_op_get_link,
.get_msglevel           = qep_get_msglevel,
.set_msglevel           = qep_set_msglevel,
.get_ringparam          = qep_get_ringparam,
.set_ringparam          = qep_set_ringparam,
.get_channels           = qep_get_channels,
.set_channels           = qep_set_channels,
.get_strings            = qep_get_strings,
.get_ethtool_stats      = qep_get_ethtool_stats,
.get_coalesce           = qep_get_coalesce,
.set_coalesce           = qep_set_coalesce,
.get_per_queue_coalesce = qep_get_per_queue_coalesce,
.set_per_queue_coalesce = qep_set_per_queue_coalesce,
.get_fecparam           = qep_get_fecparam,
.set_fecparam           = qep_set_fecparam,
.get_rxfh_key_size      = qep_get_rxfh_key_size
.get_rxfh_indir_size    = qep_rss_indir_size,
.get_rxfh               = qep_get_rxfh,
.set_rxfh               = qep_set_rxfh,
.get_rxnfc              = qep_get_rxnfc,
.get_sset_count         = qep_get_sset_count
};

Detailed documentation of the above network device operations and ethtool operations can be found in

• QEP Linux Driver APIs