Commit 506e1198 authored by Vasanthy Kolluri's avatar Vasanthy Kolluri Committed by David S. Miller

enic: Bug Fix: Handle surprise hardware removals

Handle surprise hardware removals gracefully during devcmd issue and init,
cleanup of queues.
Signed-off-by: default avatarScott Feldman <scofeldm@cisco.com>
Signed-off-by: default avatarVasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: default avatarRoopa Prabhu <roprabhu@cisco.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1825aca6
......@@ -275,6 +275,11 @@ static int _vnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
int err;
status = ioread32(&devcmd->status);
if (status == 0xFFFFFFFF) {
/* PCI-e target device is gone */
return -ENODEV;
}
if (status & STAT_BUSY) {
pr_err("Busy devcmd %d\n", _CMD_N(cmd));
return -EBUSY;
......@@ -296,6 +301,10 @@ static int _vnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
udelay(100);
status = ioread32(&devcmd->status);
if (status == 0xFFFFFFFF) {
/* PCI-e target device is gone */
return -ENODEV;
}
if (!(status & STAT_BUSY)) {
......
......@@ -146,6 +146,11 @@ void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
/* Use current fetch_index as the ring starting point */
fetch_index = ioread32(&rq->ctrl->fetch_index);
if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
/* Hardware surprise removal: reset fetch_index */
fetch_index = 0;
}
vnic_rq_init_start(rq, cq_index,
fetch_index, fetch_index,
error_interrupt_enable,
......@@ -187,8 +192,6 @@ void vnic_rq_clean(struct vnic_rq *rq,
u32 fetch_index;
unsigned int count = rq->ring.desc_count;
BUG_ON(ioread32(&rq->ctrl->enable));
buf = rq->to_clean;
while (vnic_rq_desc_used(rq) > 0) {
......@@ -201,6 +204,12 @@ void vnic_rq_clean(struct vnic_rq *rq,
/* Use current fetch_index as the ring starting point */
fetch_index = ioread32(&rq->ctrl->fetch_index);
if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
/* Hardware surprise removal: reset fetch_index */
fetch_index = 0;
}
rq->to_use = rq->to_clean =
&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
......
......@@ -178,8 +178,6 @@ void vnic_wq_clean(struct vnic_wq *wq,
{
struct vnic_wq_buf *buf;
BUG_ON(ioread32(&wq->ctrl->enable));
buf = wq->to_clean;
while (vnic_wq_desc_used(wq) > 0) {
......
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