diff options
| author | Govindarajulu Varadarajan <_govind@gmx.com> | 2015-08-16 01:44:54 +0530 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-08-17 15:25:29 -0700 |
| commit | 373fb0873d4325a7afa04aec29ced0c122d1f8a9 (patch) | |
| tree | b0da4fd30b4dde4e505b3e84339d24a0a85d683f /drivers/net/ethernet/cisco/enic/vnic_wq.c | |
| parent | fda3f52bdbbe576d78ca9ea84912b48fa51f0e90 (diff) | |
| download | linux-373fb0873d4325a7afa04aec29ced0c122d1f8a9.tar.bz2 | |
enic: add devcmd2
devcmd is an interface for driver to communicate with fw/adaptor. It
involves writing data to hardware registers and waiting for the result.
This mechanism does not scale well. The queuing of "no wait" devcmds is
done in firmware memory rather than on the host. Firmware memory is a
rather more scarce and valuable resource than host memory. A devcmd storm
from one vf can disrupt the service on other pf/vf. The lack of flow
control allows for possible denial of server from one VM to another.
Devcmd2 uses work queue to post the devcmds, just like tx work queue. This
allows better flow control.
Initialize devcmd2, if fails we fall back to devcmd1.
Also change the driver version.
Signed-off-by: N V V Satyanarayana Reddy <nalreddy@cisco.com>
Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/cisco/enic/vnic_wq.c')
| -rw-r--r-- | drivers/net/ethernet/cisco/enic/vnic_wq.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/drivers/net/ethernet/cisco/enic/vnic_wq.c b/drivers/net/ethernet/cisco/enic/vnic_wq.c index 538302ad9722..627f3b1d4b9f 100644 --- a/drivers/net/ethernet/cisco/enic/vnic_wq.c +++ b/drivers/net/ethernet/cisco/enic/vnic_wq.c @@ -114,10 +114,27 @@ int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, return 0; } -static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, - unsigned int fetch_index, unsigned int posted_index, - unsigned int error_interrupt_enable, - unsigned int error_interrupt_offset) +int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, + unsigned int desc_count, unsigned int desc_size) +{ + int err; + + wq->index = 0; + wq->vdev = vdev; + + wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0); + if (!wq->ctrl) + return -EINVAL; + vnic_wq_disable(wq); + err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); + + return err; +} + +void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, + unsigned int fetch_index, unsigned int posted_index, + unsigned int error_interrupt_enable, + unsigned int error_interrupt_offset) { u64 paddr; unsigned int count = wq->ring.desc_count; |