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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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21
drivers/net/mlx4/icm.c
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@ -301,9 +301,9 @@ void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
mutex_unlock(&table->mutex);
}
void *mlx4_table_find(struct mlx4_icm_table *table, int obj)
void *mlx4_table_find(struct mlx4_icm_table *table, int obj, dma_addr_t *dma_handle)
{
int idx, offset, i;
int idx, offset, dma_offset, i;
struct mlx4_icm_chunk *chunk;
struct mlx4_icm *icm;
struct page *page = NULL;
@ -313,15 +313,26 @@ void *mlx4_table_find(struct mlx4_icm_table *table, int obj)
mutex_lock(&table->mutex);
idx = obj & (table->num_obj - 1);
icm = table->icm[idx / (MLX4_TABLE_CHUNK_SIZE / table->obj_size)];
offset = idx % (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
idx = (obj & (table->num_obj - 1)) * table->obj_size;
icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE];
dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE;
if (!icm)
goto out;
list_for_each_entry(chunk, &icm->chunk_list, list) {
for (i = 0; i < chunk->npages; ++i) {
if (dma_handle && dma_offset >= 0) {
if (sg_dma_len(&chunk->mem[i]) > dma_offset)
*dma_handle = sg_dma_address(&chunk->mem[i]) +
dma_offset;
dma_offset -= sg_dma_len(&chunk->mem[i]);
}
/*
* DMA mapping can merge pages but not split them,
* so if we found the page, dma_handle has already
* been assigned to.
*/
if (chunk->mem[i].length > offset) {
page = chunk->mem[i].page;
goto out;