igc: Add tx_csum offload functionality (d3ae3cfb) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/net/ethernet/intel/igc/igc.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -135,6 +135,9 @@ extern char igc_driver_version[];
		/* How many Rx Buffers do we bundle into one write to the hardware ? */
		#define IGC_RX_BUFFER_WRITE 16 /* Must be power of 2 */

		/* VLAN info */
		#define IGC_TX_FLAGS_VLAN_MASK 0xffff0000

		/* igc_test_staterr - tests bits within Rx descriptor status and error fields */
		static inline __le32 igc_test_staterr(union igc_adv_rx_desc *rx_desc,
		const u32 stat_err_bits)
		@@ -254,6 +257,7 @@ struct igc_ring {
		u16 count; /* number of desc. in the ring */
		u8 queue_index; /* logical index of the ring*/
		u8 reg_idx; /* physical index of the ring */
		bool launchtime_enable; /* true if LaunchTime is enabled */

		/* everything past this point are written often */
		u16 next_to_clean;

drivers/net/ethernet/intel/igc/igc_base.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,14 @@ union igc_adv_tx_desc {
		} wb;
		};

		/* Context descriptors */
		struct igc_adv_tx_context_desc {
		__le32 vlan_macip_lens;
		__le32 launch_time;
		__le32 type_tucmd_mlhl;
		__le32 mss_l4len_idx;
		};

		/* Adv Transmit Descriptor Config Masks */
		#define IGC_ADVTXD_MAC_TSTAMP 0x00080000 /* IEEE1588 Timestamp packet */
		#define IGC_ADVTXD_DTYP_CTXT 0x00200000 /* Advanced Context Descriptor */

drivers/net/ethernet/intel/igc/igc_defines.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -397,4 +397,9 @@
		#define IGC_VLAPQF_P_VALID(_n) (0x1 << (3 + (_n) * 4))
		#define IGC_VLAPQF_QUEUE_MASK 0x03

		#define IGC_ADVTXD_MACLEN_SHIFT 9 /* Adv ctxt desc mac len shift */
		#define IGC_ADVTXD_TUCMD_IPV4 0x00000400 /* IP Packet Type:1=IPv4 */
		#define IGC_ADVTXD_TUCMD_L4T_TCP 0x00000800 /* L4 Packet Type of TCP */
		#define IGC_ADVTXD_TUCMD_L4T_SCTP 0x00001000 /* L4 packet TYPE of SCTP */

		#endif /* _IGC_DEFINES_H_ */

drivers/net/ethernet/intel/igc/igc_main.c

+97 −0

Original line number	Diff line number	Diff line
		@@ -5,6 +5,11 @@
		#include <linux/types.h>
		#include <linux/if_vlan.h>
		#include <linux/aer.h>
		#include <linux/tcp.h>
		#include <linux/udp.h>
		#include <linux/ip.h>

		#include <net/ipv6.h>

		#include "igc.h"
		#include "igc_hw.h"
		@@ -790,8 +795,96 @@ static int igc_set_mac(struct net_device netdev, void p)
		return 0;
		}

		static void igc_tx_ctxtdesc(struct igc_ring *tx_ring,
		struct igc_tx_buffer *first,
		u32 vlan_macip_lens, u32 type_tucmd,
		u32 mss_l4len_idx)
		{
		struct igc_adv_tx_context_desc *context_desc;
		u16 i = tx_ring->next_to_use;
		struct timespec64 ts;

		context_desc = IGC_TX_CTXTDESC(tx_ring, i);

		i++;
		tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;

		/* set bits to identify this as an advanced context descriptor */
		type_tucmd \|= IGC_TXD_CMD_DEXT \| IGC_ADVTXD_DTYP_CTXT;

		/* For 82575, context index must be unique per ring. */
		if (test_bit(IGC_RING_FLAG_TX_CTX_IDX, &tx_ring->flags))
		mss_l4len_idx \|= tx_ring->reg_idx << 4;

		context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens);
		context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd);
		context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);

		/* We assume there is always a valid Tx time available. Invalid times
		* should have been handled by the upper layers.
		*/
		if (tx_ring->launchtime_enable) {
		ts = ns_to_timespec64(first->skb->tstamp);
		first->skb->tstamp = 0;
		context_desc->launch_time = cpu_to_le32(ts.tv_nsec / 32);
		} else {
		context_desc->launch_time = 0;
		}
		}

		static inline bool igc_ipv6_csum_is_sctp(struct sk_buff *skb)
		{
		unsigned int offset = 0;

		ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);

		return offset == skb_checksum_start_offset(skb);
		}

		static void igc_tx_csum(struct igc_ring tx_ring, struct igc_tx_buffer first)
		{
		struct sk_buff *skb = first->skb;
		u32 vlan_macip_lens = 0;
		u32 type_tucmd = 0;

		if (skb->ip_summed != CHECKSUM_PARTIAL) {
		csum_failed:
		if (!(first->tx_flags & IGC_TX_FLAGS_VLAN) &&
		!tx_ring->launchtime_enable)
		return;
		goto no_csum;
		}

		switch (skb->csum_offset) {
		case offsetof(struct tcphdr, check):
		type_tucmd = IGC_ADVTXD_TUCMD_L4T_TCP;
		/* fall through */
		case offsetof(struct udphdr, check):
		break;
		case offsetof(struct sctphdr, checksum):
		/* validate that this is actually an SCTP request */
		if ((first->protocol == htons(ETH_P_IP) &&
		(ip_hdr(skb)->protocol == IPPROTO_SCTP)) \|\|
		(first->protocol == htons(ETH_P_IPV6) &&
		igc_ipv6_csum_is_sctp(skb))) {
		type_tucmd = IGC_ADVTXD_TUCMD_L4T_SCTP;
		break;
		}
		/* fall through */
		default:
		skb_checksum_help(skb);
		goto csum_failed;
		}

		/* update TX checksum flag */
		first->tx_flags \|= IGC_TX_FLAGS_CSUM;
		vlan_macip_lens = skb_checksum_start_offset(skb) -
		skb_network_offset(skb);
		no_csum:
		vlan_macip_lens \|= skb_network_offset(skb) << IGC_ADVTXD_MACLEN_SHIFT;
		vlan_macip_lens \|= first->tx_flags & IGC_TX_FLAGS_VLAN_MASK;

		igc_tx_ctxtdesc(tx_ring, first, vlan_macip_lens, type_tucmd, 0);
		}

		static int __igc_maybe_stop_tx(struct igc_ring *tx_ring, const u16 size)
		@@ -4116,6 +4209,9 @@ static int igc_probe(struct pci_dev *pdev,
		if (err)
		goto err_sw_init;

		/* Add supported features to the features list*/
		netdev->features \|= NETIF_F_HW_CSUM;

		/* setup the private structure */
		err = igc_sw_init(adapter);
		if (err)
		@@ -4123,6 +4219,7 @@ static int igc_probe(struct pci_dev *pdev,

		/* copy netdev features into list of user selectable features */
		netdev->hw_features \|= NETIF_F_NTUPLE;
		netdev->hw_features \|= netdev->features;

		/* MTU range: 68 - 9216 */
		netdev->min_mtu = ETH_MIN_MTU;