Commit b0390009 authored by Gatis Peisenieks's avatar Gatis Peisenieks Committed by David S. Miller
Browse files

atl1c: enable rx csum offload on Mikrotik 10/25G NIC 



Mikrotik 10/25G NIC supports hw checksum verification on rx for
IP/IPv6 + TCP/UDP packets. HW checksum offload helps reduce host
cpu load.

This enables the csum offload specifically for Mikrotik 10/25G NIC
as other HW supported by the driver is known to have problems with it.

TCP iperf3 to Threadripper 3960X with NIC improved 16.5 -> 20.0 Gbps
with mtu=1500.

Signed-off-by: default avatarGatis Peisenieks <gatis@mikrotik.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 545fa3fb

drivers/net/ethernet/atheros/atl1c/atl1c.h

+2 −0
Original line number Diff line number Diff line
@@ -241,6 +241,8 @@ struct atl1c_tpd_ext_desc { 
#define RRS_PACKET_PROT_IS_IPV6_ONLY(word) \

	((((word) >> RRS_PROT_ID_SHIFT) & RRS_PROT_ID_MASK) == 6)



#define RRS_MT_PROT_ID_TCPUDP	BIT(19)



struct atl1c_recv_ret_status {

	__le32  word0;

	__le32	rss_hash;

drivers/net/ethernet/atheros/atl1c/atl1c_main.c

+5 −0
Original line number Diff line number Diff line
@@ -1671,6 +1671,11 @@ static irqreturn_t atl1c_intr(int irq, void *data) 
static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter,

		  struct sk_buff *skb, struct atl1c_recv_ret_status *prrs)

{

	if (adapter->hw.nic_type == athr_mt) {

		if (prrs->word3 & RRS_MT_PROT_ID_TCPUDP)

			skb->ip_summed = CHECKSUM_UNNECESSARY;

		return;

	}

	/*

	 * The pid field in RRS in not correct sometimes, so we

	 * cannot figure out if the packet is fragmented or not,