drivers/net/ethernet/intel/i40e/i40e_dcb.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/intel/i40e/i40e_dcb.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/intel/i40e/i40e_dcb.c
Extension
.c
Size
55115 bytes
Lines
1916
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 (selector) {
		case I40E_CEE_APP_SEL_ETHTYPE:
			dcbcfg->app[i].selector = I40E_APP_SEL_ETHTYPE;
			break;
		case I40E_CEE_APP_SEL_TCPIP:
			dcbcfg->app[i].selector = I40E_APP_SEL_TCPIP;
			break;
		default:
			/* Keep selector as it is for unknown types */
			dcbcfg->app[i].selector = selector;
		}

		dcbcfg->app[i].protocolid = ntohs(app->protocol);
		/* Move to next app */
		offset += sizeof(*app);
	}
}

/**
 * i40e_parse_cee_tlv
 * @tlv: CEE DCBX TLV
 * @dcbcfg: Local store to update DCBX config data
 *
 * Get the TLV subtype and send it to parsing function
 * based on the subtype value
 **/
static void i40e_parse_cee_tlv(struct i40e_lldp_org_tlv *tlv,
			       struct i40e_dcbx_config *dcbcfg)
{
	u16 len, tlvlen, sublen, typelength;
	struct i40e_cee_feat_tlv *sub_tlv;
	u8 subtype, feat_tlv_count = 0;
	u32 ouisubtype;

	ouisubtype = ntohl(tlv->ouisubtype);
	subtype = FIELD_GET(I40E_LLDP_TLV_SUBTYPE_MASK, ouisubtype);
	/* Return if not CEE DCBX */
	if (subtype != I40E_CEE_DCBX_TYPE)
		return;

	typelength = ntohs(tlv->typelength);
	tlvlen = FIELD_GET(I40E_LLDP_TLV_LEN_MASK, typelength);
	len = sizeof(tlv->typelength) + sizeof(ouisubtype) +
	      sizeof(struct i40e_cee_ctrl_tlv);
	/* Return if no CEE DCBX Feature TLVs */
	if (tlvlen <= len)
		return;

	sub_tlv = (struct i40e_cee_feat_tlv *)((char *)tlv + len);
	while (feat_tlv_count < I40E_CEE_MAX_FEAT_TYPE) {
		typelength = ntohs(sub_tlv->hdr.typelen);
		sublen = FIELD_GET(I40E_LLDP_TLV_LEN_MASK, typelength);
		subtype = FIELD_GET(I40E_LLDP_TLV_TYPE_MASK, typelength);
		switch (subtype) {
		case I40E_CEE_SUBTYPE_PG_CFG:
			i40e_parse_cee_pgcfg_tlv(sub_tlv, dcbcfg);
			break;
		case I40E_CEE_SUBTYPE_PFC_CFG:
			i40e_parse_cee_pfccfg_tlv(sub_tlv, dcbcfg);
			break;
		case I40E_CEE_SUBTYPE_APP_PRI:
			i40e_parse_cee_app_tlv(sub_tlv, dcbcfg);
			break;
		default:
			return; /* Invalid Sub-type return */
		}
		feat_tlv_count++;
		/* Move to next sub TLV */
		sub_tlv = (struct i40e_cee_feat_tlv *)((char *)sub_tlv +
						sizeof(sub_tlv->hdr.typelen) +
						sublen);
	}
}

/**
 * i40e_parse_org_tlv
 * @tlv: Organization specific TLV
 * @dcbcfg: Local store to update ETS REC data
 *
 * Currently only IEEE 802.1Qaz TLV is supported, all others
 * will be returned
 **/
static void i40e_parse_org_tlv(struct i40e_lldp_org_tlv *tlv,
			       struct i40e_dcbx_config *dcbcfg)
{
	u32 ouisubtype;
	u32 oui;

	ouisubtype = ntohl(tlv->ouisubtype);
	oui = FIELD_GET(I40E_LLDP_TLV_OUI_MASK, ouisubtype);

Annotation

Implementation Notes