drivers/net/fjes/fjes_main.c

Source file repositories/reference/linux-study-clean/drivers/net/fjes/fjes_main.c

File Facts

System
Linux kernel
Corpus path
drivers/net/fjes/fjes_main.c
Extension
.c
Size
37671 bytes
Lines
1524
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static const struct net_device_ops fjes_netdev_ops = {
	.ndo_open		= fjes_open,
	.ndo_stop		= fjes_close,
	.ndo_start_xmit		= fjes_xmit_frame,
	.ndo_get_stats64	= fjes_get_stats64,
	.ndo_change_mtu		= fjes_change_mtu,
	.ndo_tx_timeout		= fjes_tx_retry,
	.ndo_vlan_rx_add_vid	= fjes_vlan_rx_add_vid,
	.ndo_vlan_rx_kill_vid = fjes_vlan_rx_kill_vid,
};

/* fjes_netdev_setup - netdevice initialization routine */
static void fjes_netdev_setup(struct net_device *netdev)
{
	ether_setup(netdev);

	netdev->watchdog_timeo = FJES_TX_RETRY_INTERVAL;
	netdev->netdev_ops = &fjes_netdev_ops;
	fjes_set_ethtool_ops(netdev);
	netdev->mtu = fjes_support_mtu[3];
	netdev->min_mtu = fjes_support_mtu[0];
	netdev->max_mtu = fjes_support_mtu[3];
	netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
}

static int fjes_rxframe_search_exist(struct fjes_adapter *adapter,
				     int start_epid)
{
	struct fjes_hw *hw = &adapter->hw;
	enum ep_partner_status pstatus;
	int max_epid, cur_epid;
	int i;

	max_epid = hw->max_epid;
	start_epid = (start_epid + 1 + max_epid) % max_epid;

	for (i = 0; i < max_epid; i++) {
		cur_epid = (start_epid + i) % max_epid;
		if (cur_epid == hw->my_epid)
			continue;

		pstatus = fjes_hw_get_partner_ep_status(hw, cur_epid);
		if (pstatus == EP_PARTNER_SHARED) {
			if (!fjes_hw_epbuf_rx_is_empty(
				&hw->ep_shm_info[cur_epid].rx))
				return cur_epid;
		}
	}
	return -1;
}

static void *fjes_rxframe_get(struct fjes_adapter *adapter, size_t *psize,
			      int *cur_epid)
{
	void *frame;

	*cur_epid = fjes_rxframe_search_exist(adapter, *cur_epid);
	if (*cur_epid < 0)
		return NULL;

	frame =
	fjes_hw_epbuf_rx_curpkt_get_addr(
		&adapter->hw.ep_shm_info[*cur_epid].rx, psize);

	return frame;
}

static void fjes_rxframe_release(struct fjes_adapter *adapter, int cur_epid)
{
	fjes_hw_epbuf_rx_curpkt_drop(&adapter->hw.ep_shm_info[cur_epid].rx);
}

static int fjes_poll(struct napi_struct *napi, int budget)
{
	struct fjes_adapter *adapter =
			container_of(napi, struct fjes_adapter, napi);
	struct net_device *netdev = napi->dev;
	struct fjes_hw *hw = &adapter->hw;
	struct sk_buff *skb;
	int work_done = 0;
	int cur_epid = 0;
	int epidx;
	size_t frame_len;
	void *frame;

	spin_lock(&hw->rx_status_lock);
	for (epidx = 0; epidx < hw->max_epid; epidx++) {
		if (epidx == hw->my_epid)
			continue;

Annotation

Implementation Notes