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mlx4_core: Write MTTs from CPU instead with of WRITE_MTT FW command

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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>
This commit is contained in:
Jack Morgenstein
2007-08-01 12:28:53 +03:00
committed by Roland Dreier
parent 121964ec38
commit d7bb58fb1c
5 changed files with 67 additions and 47 deletions
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7
drivers/infiniband/hw/mlx4/mr.c
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@@ -96,11 +96,10 @@ int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
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)