drivers/net/wireless/broadcom/b43/xmit.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/broadcom/b43/xmit.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/broadcom/b43/xmit.c
Extension
.c
Size
24952 bytes
Lines
915
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 ((octets * 16 % bitrate) > 0) {
			plen++;
			if ((bitrate == B43_CCK_RATE_11MB)
			    && ((octets * 8 % 11) < 4)) {
				raw[1] = 0x84;
			} else
				raw[1] = 0x04;
		} else
			raw[1] = 0x04;
		plcp->data |= cpu_to_le32(plen << 16);
		raw[0] = b43_plcp_get_ratecode_cck(bitrate);
	}
}

/* TODO: verify if needed for SSLPN or LCN  */
static u16 b43_generate_tx_phy_ctl1(struct b43_wldev *dev, u8 bitrate)
{
	const struct b43_phy *phy = &dev->phy;
	const struct b43_tx_legacy_rate_phy_ctl_entry *e;
	u16 control = 0;
	u16 bw;

	if (phy->type == B43_PHYTYPE_LP)
		bw = B43_TXH_PHY1_BW_20;
	else /* FIXME */
		bw = B43_TXH_PHY1_BW_20;

	if (0) { /* FIXME: MIMO */
	} else if (b43_is_cck_rate(bitrate) && phy->type != B43_PHYTYPE_LP) {
		control = bw;
	} else {
		control = bw;
		e = b43_tx_legacy_rate_phy_ctl_ent(bitrate);
		if (e) {
			control |= e->coding_rate;
			control |= e->modulation;
		}
		control |= B43_TXH_PHY1_MODE_SISO;
	}

	return control;
}

static u8 b43_calc_fallback_rate(u8 bitrate, int gmode)
{
	switch (bitrate) {
	case B43_CCK_RATE_1MB:
		return B43_CCK_RATE_1MB;
	case B43_CCK_RATE_2MB:
		return B43_CCK_RATE_1MB;
	case B43_CCK_RATE_5MB:
		return B43_CCK_RATE_2MB;
	case B43_CCK_RATE_11MB:
		return B43_CCK_RATE_5MB;
	/*
	 * Don't just fallback to CCK; it may be in 5GHz operation
	 * and falling back to CCK won't work out very well.
	 */
	case B43_OFDM_RATE_6MB:
		if (gmode)
			return B43_CCK_RATE_5MB;
		else
			return B43_OFDM_RATE_6MB;
	case B43_OFDM_RATE_9MB:
		return B43_OFDM_RATE_6MB;
	case B43_OFDM_RATE_12MB:
		return B43_OFDM_RATE_9MB;
	case B43_OFDM_RATE_18MB:
		return B43_OFDM_RATE_12MB;
	case B43_OFDM_RATE_24MB:
		return B43_OFDM_RATE_18MB;
	case B43_OFDM_RATE_36MB:
		return B43_OFDM_RATE_24MB;
	case B43_OFDM_RATE_48MB:
		return B43_OFDM_RATE_36MB;
	case B43_OFDM_RATE_54MB:
		return B43_OFDM_RATE_48MB;
	}
	B43_WARN_ON(1);
	return 0;
}

/* Generate a TX data header. */
int b43_generate_txhdr(struct b43_wldev *dev,
		       u8 *_txhdr,
		       struct sk_buff *skb_frag,
		       struct ieee80211_tx_info *info,
		       u16 cookie)
{
	const unsigned char *fragment_data = skb_frag->data;

Annotation

Implementation Notes