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enic: reduce ioread in devcmd2 

posted_index is RO in firmware. We need not do ioread everytime to get
posted index. Store posted index locally.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Govindarajulu Varadarajan 2015-08-25 14:15:11 +05:30 committed by David S. Miller
parent 6e85d5ad36
commit dafc21995d
2 changed files with 6 additions and 3 deletions
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8
drivers/net/ethernet/cisco/enic/vnic_dev.c
View File

@ -301,12 +301,12 @@ static int _vnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
struct devcmd2_result *result = dc2c->result + dc2c->next_result;
unsigned int i;
int delay, err;
u32 fetch_index, posted, new_posted;
u32 fetch_index, new_posted;
u32 posted = dc2c->posted;
posted = ioread32(&dc2c->wq_ctrl->posted_index);
fetch_index = ioread32(&dc2c->wq_ctrl->fetch_index);
if (posted == 0xFFFFFFFF || fetch_index == 0xFFFFFFFF)
if (fetch_index == 0xFFFFFFFF)
return -ENODEV;
new_posted = (posted + 1) % DEVCMD2_RING_SIZE;
@ -331,6 +331,7 @@ static int _vnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
*/
wmb();
iowrite32(new_posted, &dc2c->wq_ctrl->posted_index);
dc2c->posted = new_posted;
if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
return 0;
@ -402,6 +403,7 @@ static int vnic_dev_init_devcmd2(struct vnic_dev *vdev)
enic_wq_init_start(&vdev->devcmd2->wq, 0, fetch_index, fetch_index, 0,
0);
vdev->devcmd2->posted = fetch_index;
vnic_wq_enable(&vdev->devcmd2->wq);
err = vnic_dev_alloc_desc_ring(vdev, &vdev->devcmd2->results_ring,

1
drivers/net/ethernet/cisco/enic/vnic_wq.h
View File

@ -97,6 +97,7 @@ struct devcmd2_controller {
int color;
struct vnic_dev_ring results_ring;
struct vnic_wq wq;
u32 posted;
};
static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq)