drivers/net/ethernet/qlogic/qede/qede_fp.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/qlogic/qede/qede_fp.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/qlogic/qede/qede_fp.c
Extension
.c
Size
49397 bytes
Lines
1807
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 (skb_is_gso(skb)) {
			unsigned short gso_type = skb_shinfo(skb)->gso_type;

			if ((gso_type & SKB_GSO_UDP_TUNNEL_CSUM) ||
			    (gso_type & SKB_GSO_GRE_CSUM))
				rc |= XMIT_ENC_GSO_L4_CSUM;

			rc |= XMIT_LSO;
			return rc;
		}
	}

	if (skb_is_gso(skb))
		rc |= XMIT_LSO;

	return rc;
}

static void qede_set_params_for_ipv6_ext(struct sk_buff *skb,
					 struct eth_tx_2nd_bd *second_bd,
					 struct eth_tx_3rd_bd *third_bd)
{
	u8 l4_proto;
	u16 bd2_bits1 = 0, bd2_bits2 = 0;

	bd2_bits1 |= (1 << ETH_TX_DATA_2ND_BD_IPV6_EXT_SHIFT);

	bd2_bits2 |= ((skb_transport_offset(skb) >> 1) &
		     ETH_TX_DATA_2ND_BD_L4_HDR_START_OFFSET_W_MASK)
		    << ETH_TX_DATA_2ND_BD_L4_HDR_START_OFFSET_W_SHIFT;

	bd2_bits1 |= (ETH_L4_PSEUDO_CSUM_CORRECT_LENGTH <<
		      ETH_TX_DATA_2ND_BD_L4_PSEUDO_CSUM_MODE_SHIFT);

	if (vlan_get_protocol(skb) == htons(ETH_P_IPV6))
		l4_proto = ipv6_hdr(skb)->nexthdr;
	else
		l4_proto = ip_hdr(skb)->protocol;

	if (l4_proto == IPPROTO_UDP)
		bd2_bits1 |= 1 << ETH_TX_DATA_2ND_BD_L4_UDP_SHIFT;

	if (third_bd)
		third_bd->data.bitfields |=
			cpu_to_le16(((tcp_hdrlen(skb) / 4) &
				ETH_TX_DATA_3RD_BD_TCP_HDR_LEN_DW_MASK) <<
				ETH_TX_DATA_3RD_BD_TCP_HDR_LEN_DW_SHIFT);

	second_bd->data.bitfields1 = cpu_to_le16(bd2_bits1);
	second_bd->data.bitfields2 = cpu_to_le16(bd2_bits2);
}

static int map_frag_to_bd(struct qede_tx_queue *txq,
			  skb_frag_t *frag, struct eth_tx_bd *bd)
{
	dma_addr_t mapping;

	/* Map skb non-linear frag data for DMA */
	mapping = skb_frag_dma_map(txq->dev, frag, 0,
				   skb_frag_size(frag), DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(txq->dev, mapping)))
		return -ENOMEM;

	/* Setup the data pointer of the frag data */
	BD_SET_UNMAP_ADDR_LEN(bd, mapping, skb_frag_size(frag));

	return 0;
}

static u16 qede_get_skb_hlen(struct sk_buff *skb, bool is_encap_pkt)
{
	if (is_encap_pkt)
		return skb_inner_tcp_all_headers(skb);

	return skb_tcp_all_headers(skb);
}

/* +2 for 1st BD for headers and 2nd BD for headlen (if required) */
#if ((MAX_SKB_FRAGS + 2) > ETH_TX_MAX_BDS_PER_NON_LSO_PACKET)
static bool qede_pkt_req_lin(struct sk_buff *skb, u8 xmit_type)
{
	int allowed_frags = ETH_TX_MAX_BDS_PER_NON_LSO_PACKET - 1;

	if (xmit_type & XMIT_LSO) {
		int hlen;

		hlen = qede_get_skb_hlen(skb, xmit_type & XMIT_ENC);

		/* linear payload would require its own BD */
		if (skb_headlen(skb) > hlen)

Annotation

Implementation Notes