[lustre-devel] [PATCH 02/18] lnet: o2ib: fix page mapping error
James Simmons
jsimmons at infradead.org
Wed Jul 1 17:04:42 PDT 2020
From: Alexey Lyashkov <c17817 at cray.com>
IB DMA mapping can merge a physically continues page region into
single one.
It's confused a kiblnd_fmr_pool_map function who expect to see all
fragments mapped.
It's generate a error
(o2iblnd.c:1926:kiblnd_fmr_pool_map()) Failed to map mr 1/16 elements
By study an IB code, it looks ib_map_mr_sg return code should checked
against of result of ib_dma_map_sg instead of original fragments
count, same data should be used as argument of ib_map_mr_sg function.
Cray-bug-id: LUS-8139
WC-bug-id: https://jira.whamcloud.com/browse/LU-13181
Lustre-commit: 40385cda7afbd ("LU-13181 o2ib: fix page mapping error")
Signed-off-by: Alexey Lyashkov <c17817 at cray.com>
Reviewed-on: https://review.whamcloud.com/37388
Reviewed-by: Shaun Tancheff <shaun.tancheff at hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko at hpe.com>
Reviewed-by: James Simmons <jsimmons at infradead.org>
Reviewed-by: Oleg Drokin <green at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
net/lnet/klnds/o2iblnd/o2iblnd.c | 7 ++++---
net/lnet/klnds/o2iblnd/o2iblnd_cb.c | 3 ++-
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/net/lnet/klnds/o2iblnd/o2iblnd.c b/net/lnet/klnds/o2iblnd/o2iblnd.c
index 3a76447..16edfba 100644
--- a/net/lnet/klnds/o2iblnd/o2iblnd.c
+++ b/net/lnet/klnds/o2iblnd/o2iblnd.c
@@ -1737,10 +1737,11 @@ int kiblnd_fmr_pool_map(struct kib_fmr_poolset *fps, struct kib_tx *tx,
}
n = ib_map_mr_sg(mr, tx->tx_frags,
- tx->tx_nfrags, NULL, PAGE_SIZE);
- if (unlikely(n != tx->tx_nfrags)) {
+ rd->rd_nfrags, NULL,
+ PAGE_SIZE);
+ if (unlikely(n != rd->rd_nfrags)) {
CERROR("Failed to map mr %d/%d elements\n",
- n, tx->tx_nfrags);
+ n, rd->rd_nfrags);
return n < 0 ? n : -EINVAL;
}
diff --git a/net/lnet/klnds/o2iblnd/o2iblnd_cb.c b/net/lnet/klnds/o2iblnd/o2iblnd_cb.c
index 40e196d..3b9d10d 100644
--- a/net/lnet/klnds/o2iblnd/o2iblnd_cb.c
+++ b/net/lnet/klnds/o2iblnd/o2iblnd_cb.c
@@ -595,7 +595,8 @@ static int kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
fps = net->ibn_fmr_ps[cpt];
rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->tx_fmr);
if (rc) {
- CERROR("Can't map %u bytes: %d\n", nob, rc);
+ CERROR("Can't map %u bytes (%u/%u)s: %d\n", nob,
+ tx->tx_nfrags, rd->rd_nfrags, rc);
return rc;
}
--
1.8.3.1
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