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| author |   Roland Dreier <roland@topspin.com> | 2005-04-16 15:26:24 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:26:24 -0700 |
| commit | 44ea66879d5638cfed5b5ecf628badfd8ec26f36 (patch) | |
| tree | 987bb5368a8e4a058cffc2eef4752d7cca4335e5 /drivers/infiniband/hw/mthca/mthca_profile.c | |
| parent | [PATCH] IB/mthca: implement RDMA/atomic operations for mem-free mode (diff) | |
| download | linux-dev-44ea66879d5638cfed5b5ecf628badfd8ec26f36.tar.xz linux-dev-44ea66879d5638cfed5b5ecf628badfd8ec26f36.zip | |
[PATCH] IB/mthca: fix MTT allocation in mem-free mode
Fix bug in MTT allocation in mem-free mode.
I misunderstood the MTT size value returned by the firmware -- it is really
the size of a single MTT entry, since mem-free mode does not segment the MTT
as the original firmware did. This meant that our MTT addresses ended up
being off by a factor of 8. This meant that our MTT allocations might
overlap, and so we could overwrite and corrupt earlier memory regions when
writing new MTT entries.
We fix this by always using our 64-byte MTT segment size. This allows some
simplification of the code as well, since there's no reason to put the MTT
segment size in a variable -- we can always use our enum value directly.
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/hw/mthca/mthca_profile.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_profile.c b/drivers/infiniband/hw/mthca/mthca_profile.c index 9ffe76e23a9e..cfd6f70c8df3 100644 --- a/drivers/infiniband/hw/mthca/mthca_profile.c +++ b/drivers/infiniband/hw/mthca/mthca_profile.c @@ -95,7 +95,7 @@ u64 mthca_make_profile(struct mthca_dev *dev, profile[MTHCA_RES_RDB].size = MTHCA_RDB_ENTRY_SIZE; profile[MTHCA_RES_MCG].size = MTHCA_MGM_ENTRY_SIZE; profile[MTHCA_RES_MPT].size = dev_lim->mpt_entry_sz; - profile[MTHCA_RES_MTT].size = dev_lim->mtt_seg_sz; + profile[MTHCA_RES_MTT].size = MTHCA_MTT_SEG_SIZE; profile[MTHCA_RES_UAR].size = dev_lim->uar_scratch_entry_sz; profile[MTHCA_RES_UDAV].size = MTHCA_AV_SIZE; profile[MTHCA_RES_UARC].size = request->uarc_size; @@ -229,10 +229,9 @@ u64 mthca_make_profile(struct mthca_dev *dev, break; case MTHCA_RES_MTT: dev->limits.num_mtt_segs = profile[i].num; - dev->limits.mtt_seg_size = dev_lim->mtt_seg_sz; dev->mr_table.mtt_base = profile[i].start; init_hca->mtt_base = profile[i].start; - init_hca->mtt_seg_sz = ffs(dev_lim->mtt_seg_sz) - 7; + init_hca->mtt_seg_sz = ffs(MTHCA_MTT_SEG_SIZE) - 7; break; case MTHCA_RES_UAR: dev->limits.num_uars = profile[i].num; |