On Sparc64 page size is 8k. So single page contain 2 RDS fragments. If 'rds_ib_cong_recv' ignore the RDS fragment offset in to the page it then read the data fragment as far congestion map update and lead to corruption of the RDS connection far congestion map.
This patch require the below patch for Sparc64 platforms: 001f8f8 RDS: fix "Kernel unaligned access" on sparc64 Signed-off-by: Shamir Rabinovitch <[email protected]> Reviewed-by: Wengang Wang <[email protected]> Reviewed-by: Ajaykumar Hotchandani <[email protected]> Acked-by: Santosh Shilimkar <[email protected]> Tested-by: Anand Bibhuti <[email protected]> --- net/rds/ib_recv.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index 977fb86..abc8cc8 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -796,7 +796,7 @@ static void rds_ib_cong_recv(struct rds_connection *conn, addr = kmap_atomic(sg_page(&frag->f_sg)); - src = addr + frag_off; + src = addr + frag->f_sg.offset + frag_off; dst = (void *)map->m_page_addrs[map_page] + map_off; for (k = 0; k < to_copy; k += 8) { /* Record ports that became uncongested, ie -- 1.7.1
