mlx4_core: Write MTTs from CPU instead with of WRITE_MTT FW command
Write MTT entries directly to ICM from the driver (eliminating use of
WRITE_MTT command). This reduces the number of FW commands needed to
register an MR by at least a factor of 2 and speeds up memory
registration significantly. This code will also be used to implement
FMRs.
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c
index 85ae906..734ec2b 100644
--- a/drivers/infiniband/hw/mlx4/mr.c
+++ b/drivers/infiniband/hw/mlx4/mr.c
@@ -96,11 +96,10 @@
pages[i++] = sg_dma_address(&chunk->page_list[j]) +
umem->page_size * k;
/*
- * Be friendly to WRITE_MTT firmware
- * command, and pass it chunks of
- * appropriate size.
+ * Be friendly to mlx4_write_mtt() and
+ * pass it chunks of appropriate size.
*/
- if (i == PAGE_SIZE / sizeof (u64) - 2) {
+ if (i == PAGE_SIZE / sizeof (u64)) {
err = mlx4_write_mtt(dev->dev, mtt, n,
i, pages);
if (err)