From bbdd267ef2796e96b461b8447b2026ce06e6ec4b Mon Sep 17 00:00:00 2001 From: Hoang-Nam Nguyen Date: Thu, 17 Jan 2008 15:05:45 +0100 Subject: IB/ehca: Add "port connection autodetect mode" This patch enhances ehca with a capability to "autodetect" the ports being connected physically. In order to utilize that function the module option nr_ports must be set to -1 (default is 2 - two ports). This feature is experimental and will made the default later. More detail: If the user connects only one port to the switch, current code requires 1) port one to be connected and 2) module option nr_ports=1 to be given. If autodetect is enabled, ehca will not wait at creation of the GSI QP for the respective port to become active. Since firmware does not accept modify_qp() while the port is down at initialization, we need to cache all calls to modify_qp() for the SMI/GSI QP and just return a good return code. When a port is activated and we get a PORT_ACTIVE event, we replay the cached modify-qp() parms and re-trigger any posted recv WRs. Only then do we forward the PORT_ACTIVE event to registered clients. The result of this autodetect patch is that all ports will be accessible by the users. Depending on their respective cabling only those ports that are connected properly will become operable. If a user tries to modify a regular QP of a non-connected port, modify_qp() will fail. Furthermore, ibv_devinfo should show the port state accordingly. Note that this patch primarily improves the loading behaviour of ehca. If the cable is removed while the driver is operating and plugged in again, firmware will handle that properly by sending an appropriate async event. Signed-off-by: Hoang-Nam Nguyen Signed-off-by: Roland Dreier --- drivers/infiniband/hw/ehca/ehca_sqp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/infiniband/hw/ehca/ehca_sqp.c') diff --git a/drivers/infiniband/hw/ehca/ehca_sqp.c b/drivers/infiniband/hw/ehca/ehca_sqp.c index f0792e5fbd02..79e72b25b252 100644 --- a/drivers/infiniband/hw/ehca/ehca_sqp.c +++ b/drivers/infiniband/hw/ehca/ehca_sqp.c @@ -40,11 +40,8 @@ */ -#include -#include #include "ehca_classes.h" #include "ehca_tools.h" -#include "ehca_qes.h" #include "ehca_iverbs.h" #include "hcp_if.h" @@ -93,6 +90,9 @@ u64 ehca_define_sqp(struct ehca_shca *shca, return H_PARAMETER; } + if (ehca_nr_ports < 0) /* autodetect mode */ + return H_SUCCESS; + for (counter = 0; shca->sport[port - 1].port_state != IB_PORT_ACTIVE && counter < ehca_port_act_time; -- cgit v1.2.3-59-g8ed1b