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Commit 92e5011a authored by Steve Wise's avatar Steve Wise Committed by Roland Dreier
Browse files

RDMA/cxgb4: Force T5 connections to use TAHOE congestion control 



This is required to work around a T5 HW issue.

Signed-off-by: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
parent cc18b939

drivers/infiniband/hw/cxgb4/cm.c

+8 −0
Original line number Diff line number Diff line
@@ -587,6 +587,10 @@ static int send_connect(struct c4iw_ep *ep) 
		opt2 |= SACK_EN(1);

	if (wscale && enable_tcp_window_scaling)

		opt2 |= WND_SCALE_EN(1);

	if (is_t5(ep->com.dev->rdev.lldi.adapter_type)) {

		opt2 |= T5_OPT_2_VALID;

		opt2 |= V_CONG_CNTRL(CONG_ALG_TAHOE);

	}

	t4_set_arp_err_handler(skb, NULL, act_open_req_arp_failure);



	if (is_t4(ep->com.dev->rdev.lldi.adapter_type)) {
@@ -2018,6 +2022,10 @@ static void accept_cr(struct c4iw_ep *ep, struct sk_buff *skb, 
		if (tcph->ece && tcph->cwr)

			opt2 |= CCTRL_ECN(1);

	}

	if (is_t5(ep->com.dev->rdev.lldi.adapter_type)) {

		opt2 |= T5_OPT_2_VALID;

		opt2 |= V_CONG_CNTRL(CONG_ALG_TAHOE);

	}



	rpl = cplhdr(skb);

	INIT_TP_WR(rpl, ep->hwtid);

drivers/infiniband/hw/cxgb4/t4fw_ri_api.h

+14 −0
Original line number Diff line number Diff line
@@ -836,4 +836,18 @@ struct ulptx_idata { 
#define V_RX_DACK_CHANGE(x) ((x) << S_RX_DACK_CHANGE)

#define F_RX_DACK_CHANGE    V_RX_DACK_CHANGE(1U)



enum {                     /* TCP congestion control algorithms */

	CONG_ALG_RENO,

	CONG_ALG_TAHOE,

	CONG_ALG_NEWRENO,

	CONG_ALG_HIGHSPEED

};



#define S_CONG_CNTRL    14

#define M_CONG_CNTRL    0x3

#define V_CONG_CNTRL(x) ((x) << S_CONG_CNTRL)

#define G_CONG_CNTRL(x) (((x) >> S_CONG_CNTRL) & M_CONG_CNTRL)



#define T5_OPT_2_VALID       (1 << 31)



#endif /* _T4FW_RI_API_H_ */