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authorIngo Molnar <mingo@elte.hu>2008-06-23 11:53:03 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-23 11:53:03 +0200
commit009b9fc98ddd83f9139fdabb12c0d7a8535d5421 (patch)
treef7d3e182407d2ebe50a9b8db6361ac910027a1cf /drivers/infiniband/hw/mthca/mthca_main.c
parent3711ccb07b7f0a13f4f1aa16a8fdca9c930f21ca (diff)
parent481c5346d0981940ee63037eb53e4e37b0735c10 (diff)
Merge branch 'linus' into x86/threadinfotip-x86-threadinfo-2008-06-23_09.53_Mon
Diffstat (limited to 'drivers/infiniband/hw/mthca/mthca_main.c')
-rw-r--r--drivers/infiniband/hw/mthca/mthca_main.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_main.c b/drivers/infiniband/hw/mthca/mthca_main.c
index 9ebadd6e0cfb..200cf13fc9bb 100644
--- a/drivers/infiniband/hw/mthca/mthca_main.c
+++ b/drivers/infiniband/hw/mthca/mthca_main.c
@@ -45,6 +45,7 @@
#include "mthca_cmd.h"
#include "mthca_profile.h"
#include "mthca_memfree.h"
+#include "mthca_wqe.h"
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("Mellanox InfiniBand HCA low-level driver");
@@ -200,7 +201,18 @@ static int mthca_dev_lim(struct mthca_dev *mdev, struct mthca_dev_lim *dev_lim)
mdev->limits.gid_table_len = dev_lim->max_gids;
mdev->limits.pkey_table_len = dev_lim->max_pkeys;
mdev->limits.local_ca_ack_delay = dev_lim->local_ca_ack_delay;
- mdev->limits.max_sg = dev_lim->max_sg;
+ /*
+ * Need to allow for worst case send WQE overhead and check
+ * whether max_desc_sz imposes a lower limit than max_sg; UD
+ * send has the biggest overhead.
+ */
+ mdev->limits.max_sg = min_t(int, dev_lim->max_sg,
+ (dev_lim->max_desc_sz -
+ sizeof (struct mthca_next_seg) -
+ (mthca_is_memfree(mdev) ?
+ sizeof (struct mthca_arbel_ud_seg) :
+ sizeof (struct mthca_tavor_ud_seg))) /
+ sizeof (struct mthca_data_seg));
mdev->limits.max_wqes = dev_lim->max_qp_sz;
mdev->limits.max_qp_init_rdma = dev_lim->max_requester_per_qp;
mdev->limits.reserved_qps = dev_lim->reserved_qps;