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

This is required to work around a T5 HW issue.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Steve Wise 2014-04-24 14:31:59 -05:00 committed by Roland Dreier
parent cc18b939e1
commit 92e5011ab0
2 changed files with 22 additions and 0 deletions
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8
drivers/infiniband/hw/cxgb4/cm.c
View File

@ -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);

14
drivers/infiniband/hw/cxgb4/t4fw_ri_api.h
View File

@ -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_ */