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nfp: wait for the NSP resource to appear on boot

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The control process (NSP) may take some time to complete its
initialization.  This is not a problem on most servers, but
on very fast-booting machines it may not be ready for operation
when driver probes the device.  There is also a version of the
flash in the wild where NSP tries to train the links as part
of init.  To wait for NSP initialization we should make sure
its resource has already been added to the resource table.
NSP adds itself there as last step of init.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-09-13 10:16:00 -07:00 committed by David S. Miller
parent 4cbe94f2af
commit 7dbd5b7517
3 changed files with 51 additions and 0 deletions
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4
drivers/net/ethernet/netronome/nfp/nfp_main.c
View file

@ -351,6 +351,10 @@ static int nfp_nsp_init(struct pci_dev *pdev, struct nfp_pf *pf)
struct nfp_nsp *nsp;
int err;
err = nfp_resource_wait(pf->cpp, NFP_RESOURCE_NSP, 30);
if (err)
return err;
nsp = nfp_nsp_open(pf->cpp);
if (IS_ERR(nsp)) {
err = PTR_ERR(nsp);

2
drivers/net/ethernet/netronome/nfp/nfpcore/nfp.h
View file

@ -97,6 +97,8 @@ nfp_resource_acquire(struct nfp_cpp *cpp, const char *name);
void nfp_resource_release(struct nfp_resource *res);
int nfp_resource_wait(struct nfp_cpp *cpp, const char *name, unsigned int secs);
u32 nfp_resource_cpp_id(struct nfp_resource *res);
const char *nfp_resource_name(struct nfp_resource *res);

45
drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c
View file

@ -249,6 +249,51 @@ void nfp_resource_release(struct nfp_resource *res)
kfree(res);
}
/**
* nfp_resource_wait() - Wait for resource to appear
* @cpp: NFP CPP handle
* @name: Name of the resource
* @secs: Number of seconds to wait
*
* Wait for resource to appear in the resource table, grab and release
* its lock. The wait is jiffies-based, don't expect fine granularity.
*
* Return: 0 on success, errno otherwise.
*/
int nfp_resource_wait(struct nfp_cpp *cpp, const char *name, unsigned int secs)
{
unsigned long warn_at = jiffies + NFP_MUTEX_WAIT_FIRST_WARN * HZ;
unsigned long err_at = jiffies + secs * HZ;
struct nfp_resource *res;
while (true) {
res = nfp_resource_acquire(cpp, name);
if (!IS_ERR(res)) {
nfp_resource_release(res);
return 0;
}
if (PTR_ERR(res) != -ENOENT) {
nfp_err(cpp, "error waiting for resource %s: %ld\n",
name, PTR_ERR(res));
return PTR_ERR(res);
}
if (time_is_before_eq_jiffies(err_at)) {
nfp_err(cpp, "timeout waiting for resource %s\n", name);
return -ETIMEDOUT;
}
if (time_is_before_eq_jiffies(warn_at)) {
warn_at = jiffies + NFP_MUTEX_WAIT_NEXT_WARN * HZ;
nfp_info(cpp, "waiting for NFP resource %s\n", name);
}
if (msleep_interruptible(10)) {
nfp_err(cpp, "wait for resource %s interrupted\n",
name);
return -ERESTARTSYS;
}
}
}
/**
* nfp_resource_cpp_id() - Return the cpp_id of a resource handle
* @res: NFP Resource handle