RDMA/cxgb4: Add module option to tweak delayed ack
Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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@ -61,6 +61,10 @@ static char *states[] = {
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NULL,
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};
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static int dack_mode;
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module_param(dack_mode, int, 0644);
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MODULE_PARM_DESC(dack_mode, "Delayed ack mode (default=0)");
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int c4iw_max_read_depth = 8;
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module_param(c4iw_max_read_depth, int, 0644);
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MODULE_PARM_DESC(c4iw_max_read_depth, "Per-connection max ORD/IRD (default=8)");
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@ -474,6 +478,7 @@ static int send_connect(struct c4iw_ep *ep)
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cxgb4_best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx);
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wscale = compute_wscale(rcv_win);
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opt0 = KEEP_ALIVE(1) |
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DELACK(1) |
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WND_SCALE(wscale) |
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MSS_IDX(mtu_idx) |
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L2T_IDX(ep->l2t->idx) |
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@ -845,7 +850,9 @@ static int update_rx_credits(struct c4iw_ep *ep, u32 credits)
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INIT_TP_WR(req, ep->hwtid);
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OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
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ep->hwtid));
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req->credit_dack = cpu_to_be32(credits);
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req->credit_dack = cpu_to_be32(credits | RX_FORCE_ACK(1) |
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F_RX_DACK_CHANGE |
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V_RX_DACK_MODE(dack_mode));
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set_wr_txq(skb, CPL_PRIORITY_ACK, ep->txq_idx);
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c4iw_ofld_send(&ep->com.dev->rdev, skb);
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return credits;
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@ -1264,6 +1271,7 @@ static void accept_cr(struct c4iw_ep *ep, __be32 peer_ip, struct sk_buff *skb,
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cxgb4_best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx);
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wscale = compute_wscale(rcv_win);
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opt0 = KEEP_ALIVE(1) |
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DELACK(1) |
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WND_SCALE(wscale) |
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MSS_IDX(mtu_idx) |
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L2T_IDX(ep->l2t->idx) |
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@ -826,4 +826,14 @@ struct ulptx_idata {
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#define S_ULPTX_NSGE 0
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#define M_ULPTX_NSGE 0xFFFF
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#define V_ULPTX_NSGE(x) ((x) << S_ULPTX_NSGE)
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#define S_RX_DACK_MODE 29
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#define M_RX_DACK_MODE 0x3
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#define V_RX_DACK_MODE(x) ((x) << S_RX_DACK_MODE)
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#define G_RX_DACK_MODE(x) (((x) >> S_RX_DACK_MODE) & M_RX_DACK_MODE)
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#define S_RX_DACK_CHANGE 31
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#define V_RX_DACK_CHANGE(x) ((x) << S_RX_DACK_CHANGE)
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#define F_RX_DACK_CHANGE V_RX_DACK_CHANGE(1U)
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#endif /* _T4FW_RI_API_H_ */
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