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authorSteve Wise <swise@opengridcomputing.com>2010-06-23 15:46:49 +0000
committerRoland Dreier <rolandd@cisco.com>2010-07-21 10:53:52 -0700
commitba6d39256bed87a0e8ee1770b5f7638bb3e0cfe4 (patch)
tree5cf7c80ff6a363a08763c1e03526355535a2efe0 /drivers/infiniband
parent85963e4cbcf11c00b1d27ea0e0fcab8cb3d7a69b (diff)
downloadblackbird-op-linux-ba6d39256bed87a0e8ee1770b5f7638bb3e0cfe4.tar.gz
blackbird-op-linux-ba6d39256bed87a0e8ee1770b5f7638bb3e0cfe4.zip
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>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/hw/cxgb4/cm.c10
-rw-r--r--drivers/infiniband/hw/cxgb4/t4fw_ri_api.h10
2 files changed, 19 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 4185c3b0635b..e7b08dca740a 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -61,6 +61,10 @@ static char *states[] = {
NULL,
};
+static int dack_mode;
+module_param(dack_mode, int, 0644);
+MODULE_PARM_DESC(dack_mode, "Delayed ack mode (default=0)");
+
int c4iw_max_read_depth = 8;
module_param(c4iw_max_read_depth, int, 0644);
MODULE_PARM_DESC(c4iw_max_read_depth, "Per-connection max ORD/IRD (default=8)");
@@ -474,6 +478,7 @@ static int send_connect(struct c4iw_ep *ep)
cxgb4_best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx);
wscale = compute_wscale(rcv_win);
opt0 = KEEP_ALIVE(1) |
+ DELACK(1) |
WND_SCALE(wscale) |
MSS_IDX(mtu_idx) |
L2T_IDX(ep->l2t->idx) |
@@ -845,7 +850,9 @@ static int update_rx_credits(struct c4iw_ep *ep, u32 credits)
INIT_TP_WR(req, ep->hwtid);
OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
ep->hwtid));
- req->credit_dack = cpu_to_be32(credits);
+ req->credit_dack = cpu_to_be32(credits | RX_FORCE_ACK(1) |
+ F_RX_DACK_CHANGE |
+ V_RX_DACK_MODE(dack_mode));
set_wr_txq(skb, CPL_PRIORITY_ACK, ep->txq_idx);
c4iw_ofld_send(&ep->com.dev->rdev, skb);
return credits;
@@ -1264,6 +1271,7 @@ static void accept_cr(struct c4iw_ep *ep, __be32 peer_ip, struct sk_buff *skb,
cxgb4_best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx);
wscale = compute_wscale(rcv_win);
opt0 = KEEP_ALIVE(1) |
+ DELACK(1) |
WND_SCALE(wscale) |
MSS_IDX(mtu_idx) |
L2T_IDX(ep->l2t->idx) |
diff --git a/drivers/infiniband/hw/cxgb4/t4fw_ri_api.h b/drivers/infiniband/hw/cxgb4/t4fw_ri_api.h
index fc706bd07fae..dc193c292671 100644
--- a/drivers/infiniband/hw/cxgb4/t4fw_ri_api.h
+++ b/drivers/infiniband/hw/cxgb4/t4fw_ri_api.h
@@ -826,4 +826,14 @@ struct ulptx_idata {
#define S_ULPTX_NSGE 0
#define M_ULPTX_NSGE 0xFFFF
#define V_ULPTX_NSGE(x) ((x) << S_ULPTX_NSGE)
+
+#define S_RX_DACK_MODE 29
+#define M_RX_DACK_MODE 0x3
+#define V_RX_DACK_MODE(x) ((x) << S_RX_DACK_MODE)
+#define G_RX_DACK_MODE(x) (((x) >> S_RX_DACK_MODE) & M_RX_DACK_MODE)
+
+#define S_RX_DACK_CHANGE 31
+#define V_RX_DACK_CHANGE(x) ((x) << S_RX_DACK_CHANGE)
+#define F_RX_DACK_CHANGE V_RX_DACK_CHANGE(1U)
+
#endif /* _T4FW_RI_API_H_ */
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