diff options
| author |   Dave Olson <dave.olson@qlogic.com> | 2008-04-16 21:01:12 -0700 |
|---|---|---|
| committer |   Roland Dreier <rolandd@cisco.com> | 2008-04-16 21:01:12 -0700 |
| commit | 826d801009fb3c82832f2d92149446cce354bf61 (patch) | |
| tree | 564534dee75be00b019b78b130ec6eb7e5a81e7d /drivers/infiniband/hw/ipath/ipath_mad.c | |
| parent | IB/ipath: Shared context code needs to be sure device is usable (diff) | |
| download | linux-dev-826d801009fb3c82832f2d92149446cce354bf61.tar.xz linux-dev-826d801009fb3c82832f2d92149446cce354bf61.zip | |
IB/ipath: Enable 4KB MTU
Enable use of 4KB MTU. Since the driver uses more pinned memory for
receive buffers when the 4KB MTU is enabled, whether or not the fabric
supports that MTU, add a "mtu4096" module parameter that can be used to
limit the MTU to 2KB when it is known that 4KB MTUs can't be used
anyway.
Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_mad.c')
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_mad.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_mad.c b/drivers/infiniband/hw/ipath/ipath_mad.c index b34b91d3723a..aca876bae1c4 100644 --- a/drivers/infiniband/hw/ipath/ipath_mad.c +++ b/drivers/infiniband/hw/ipath/ipath_mad.c @@ -292,13 +292,9 @@ static int recv_subn_get_portinfo(struct ib_smp *smp, /* pip->vl_arb_high_cap; // only one VL */ /* pip->vl_arb_low_cap; // only one VL */ /* InitTypeReply = 0 */ - /* - * Note: the chips support a maximum MTU of 4096, but the driver - * hasn't implemented this feature yet, so set the maximum value - * to 2048. - */ - pip->inittypereply_mtucap = IB_MTU_2048; - // HCAs ignore VLStallCount and HOQLife + /* our mtu cap depends on whether 4K MTU enabled or not */ + pip->inittypereply_mtucap = ipath_mtu4096 ? IB_MTU_4096 : IB_MTU_2048; + /* HCAs ignore VLStallCount and HOQLife */ /* pip->vlstallcnt_hoqlife; */ pip->operationalvl_pei_peo_fpi_fpo = 0x10; /* OVLs = 1 */ pip->mkey_violations = cpu_to_be16(dev->mkey_violations); @@ -491,6 +487,8 @@ static int recv_subn_set_portinfo(struct ib_smp *smp, mtu = 2048; break; case IB_MTU_4096: + if (!ipath_mtu4096) + goto err; mtu = 4096; break; default: |