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dpaa_eth: add ethtool coalesce control 

Allow ethtool control of the DPAA QMan portal interrupt coalescing
settings.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Madalin Bucur 2018-11-21 13:41:09 +02:00 committed by David S. Miller
parent 5c664ace8c
commit 10f70e9432
1 changed files with 71 additions and 0 deletions
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71
drivers/net/ethernet/freescale/dpaa/dpaa_ethtool.c
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@ -529,6 +529,75 @@ static int dpaa_get_ts_info(struct net_device *net_dev,
return 0;
}
static int dpaa_get_coalesce(struct net_device *dev,
struct ethtool_coalesce *c)
{
struct qman_portal *portal;
u32 period;
u8 thresh;
portal = qman_get_affine_portal(smp_processor_id());
qman_portal_get_iperiod(portal, &period);
qman_dqrr_get_ithresh(portal, &thresh);
c->rx_coalesce_usecs = period;
c->rx_max_coalesced_frames = thresh;
c->use_adaptive_rx_coalesce = false;
return 0;
}
static int dpaa_set_coalesce(struct net_device *dev,
struct ethtool_coalesce *c)
{
const cpumask_t *cpus = qman_affine_cpus();
bool needs_revert[NR_CPUS] = {false};
struct qman_portal *portal;
u32 period, prev_period;
u8 thresh, prev_thresh;
int cpu, res;
if (c->use_adaptive_rx_coalesce)
return -EINVAL;
period = c->rx_coalesce_usecs;
thresh = c->rx_max_coalesced_frames;
/* save previous values */
portal = qman_get_affine_portal(smp_processor_id());
qman_portal_get_iperiod(portal, &prev_period);
qman_dqrr_get_ithresh(portal, &prev_thresh);
/* set new values */
for_each_cpu(cpu, cpus) {
portal = qman_get_affine_portal(cpu);
res = qman_portal_set_iperiod(portal, period);
if (res)
goto revert_values;
res = qman_dqrr_set_ithresh(portal, thresh);
if (res) {
qman_portal_set_iperiod(portal, prev_period);
goto revert_values;
}
needs_revert[cpu] = true;
}
return 0;
revert_values:
/* restore previous values */
for_each_cpu(cpu, cpus) {
if (!needs_revert[cpu])
continue;
portal = qman_get_affine_portal(cpu);
/* previous values will not fail, ignore return value */
qman_portal_set_iperiod(portal, prev_period);
qman_dqrr_set_ithresh(portal, prev_thresh);
}
return res;
}
const struct ethtool_ops dpaa_ethtool_ops = {
.get_drvinfo = dpaa_get_drvinfo,
.get_msglevel = dpaa_get_msglevel,
@ -545,4 +614,6 @@ const struct ethtool_ops dpaa_ethtool_ops = {
.get_rxnfc = dpaa_get_rxnfc,
.set_rxnfc = dpaa_set_rxnfc,
.get_ts_info = dpaa_get_ts_info,
.get_coalesce = dpaa_get_coalesce,
.set_coalesce = dpaa_set_coalesce,
};