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RDMA/cxgb3: Turn off RX coalescing for iWARP connections

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commit bec658ff31 upstream.

The HW by default has RX coalescing on.  For iWARP connections, this
causes a 100ms delay in connection establishement due to the ingress
MPA Start message being stalled in HW.  So explicitly turn RX
coalescing off when setting up iWARP connections.

This was causing very bad performance for NP64 gather operations using
Open MPI, due to the way it sets up connections on larger jobs.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Steve Wise
2010-09-18 19:38:21 -05:00
committed by Greg Kroah-Hartman
parent 8a5c82d66f
commit f4fe0c68bc
1 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/infiniband/hw/cxgb3/iwch_cm.c
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@@ -486,7 +486,8 @@ static int send_connect(struct iwch_ep *ep)
V_MSS_IDX(mtu_idx) |
V_L2T_IDX(ep->l2t->idx) | V_TX_CHANNEL(ep->l2t->smt_idx);
opt0l = V_TOS((ep->tos >> 2) & M_TOS) | V_RCV_BUFSIZ(rcv_win>>10);
opt2 = V_FLAVORS_VALID(1) | V_CONG_CONTROL_FLAVOR(cong_flavor);
opt2 = F_RX_COALESCE_VALID | V_RX_COALESCE(0) | V_FLAVORS_VALID(1) |
V_CONG_CONTROL_FLAVOR(cong_flavor);
skb->priority = CPL_PRIORITY_SETUP;
set_arp_failure_handler(skb, act_open_req_arp_failure);
@@ -1303,7 +1304,8 @@ static void accept_cr(struct iwch_ep *ep, __be32 peer_ip, struct sk_buff *skb)
V_MSS_IDX(mtu_idx) |
V_L2T_IDX(ep->l2t->idx) | V_TX_CHANNEL(ep->l2t->smt_idx);
opt0l = V_TOS((ep->tos >> 2) & M_TOS) | V_RCV_BUFSIZ(rcv_win>>10);
opt2 = V_FLAVORS_VALID(1) | V_CONG_CONTROL_FLAVOR(cong_flavor);
opt2 = F_RX_COALESCE_VALID | V_RX_COALESCE(0) | V_FLAVORS_VALID(1) |
V_CONG_CONTROL_FLAVOR(cong_flavor);
rpl = cplhdr(skb);
rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));