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nfp: opportunistically poll for reconfig result

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If the reconfig was a quick update, we could have results available from
firmware within 200us.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dirk van der Merwe 2019-04-11 20:27:04 -07:00 committed by David S. Miller
parent 1deeb6408c
commit e64718282c
1 changed files with 21 additions and 4 deletions
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25
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
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@ -137,20 +137,37 @@ static bool nfp_net_reconfig_check_done(struct nfp_net *nn, bool last_check)
return false;
}
static int nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
static bool __nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
{
bool timed_out = false;
int i;
/* Poll update field, waiting for NFP to ack the config.
* Do an opportunistic wait-busy loop, afterward sleep.
*/
for (i = 0; i < 50; i++) {
if (nfp_net_reconfig_check_done(nn, false))
return false;
udelay(4);
}
/* Poll update field, waiting for NFP to ack the config */
while (!nfp_net_reconfig_check_done(nn, timed_out)) {
msleep(1);
usleep_range(250, 500);
timed_out = time_is_before_eq_jiffies(deadline);
}
return timed_out;
}
static int nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
{
if (__nfp_net_reconfig_wait(nn, deadline))
return -EIO;
if (nn_readl(nn, NFP_NET_CFG_UPDATE) & NFP_NET_CFG_UPDATE_ERR)
return -EIO;
return timed_out ? -EIO : 0;
return 0;
}
static void nfp_net_reconfig_timer(struct timer_list *t)