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net: atlantic: automatically downgrade the number of queues if necessary 

This patch adds support for automatic queue number downgrade.

On A2: this is a must have, because only TC0/TC1 support more than 4Q.
Other TCs support 4Qs maximum.
Thus, on A2 we must downgrade the number of queues per TC to 4, if more
than 2 TCs are requested.

On A1: this allows using 8TCs even on systems with cpu count >= 8, when
we have 8 queues by default.
We will just automatically switch to 8TCx4Q mode in this case.

Signed-off-by: Mark Starovoytov <mstarovoitov@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mark Starovoytov 2020-05-22 11:19:44 +03:00 committed by David S. Miller
parent 7327699f35
commit 14ef766b13
4 changed files with 63 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/net/ethernet/aquantia/atlantic/aq_ethtool.c
View File

@ -793,8 +793,6 @@ static int aq_set_ringparam(struct net_device *ndev,
dev_close(ndev);
}
aq_nic_free_vectors(aq_nic);
cfg->rxds = max(ring->rx_pending, hw_caps->rxds_min);
cfg->rxds = min(cfg->rxds, hw_caps->rxds_max);
cfg->rxds = ALIGN(cfg->rxds, AQ_HW_RXD_MULTIPLE);
@ -803,15 +801,10 @@ static int aq_set_ringparam(struct net_device *ndev,
cfg->txds = min(cfg->txds, hw_caps->txds_max);
cfg->txds = ALIGN(cfg->txds, AQ_HW_TXD_MULTIPLE);
for (aq_nic->aq_vecs = 0; aq_nic->aq_vecs < cfg->vecs;
aq_nic->aq_vecs++) {
aq_nic->aq_vec[aq_nic->aq_vecs] =
aq_vec_alloc(aq_nic, aq_nic->aq_vecs, cfg);
if (unlikely(!aq_nic->aq_vec[aq_nic->aq_vecs])) {
err = -ENOMEM;
goto err_exit;
}
}
err = aq_nic_realloc_vectors(aq_nic);
if (err)
goto err_exit;
if (ndev_running)
err = dev_open(ndev, NULL);

5
drivers/net/ethernet/aquantia/atlantic/aq_main.c
View File

@ -337,9 +337,12 @@ static int aq_validate_mqprio_opt(struct aq_nic_s *self,
const unsigned int num_tc)
{
const bool has_min_rate = !!(mqprio->flags & TC_MQPRIO_F_MIN_RATE);
struct aq_nic_cfg_s *aq_nic_cfg = aq_nic_get_cfg(self);
const unsigned int tcs_max = min_t(u8, aq_nic_cfg->aq_hw_caps->tcs_max,
AQ_CFG_TCS_MAX);
int i;
if (num_tc > aq_hw_num_tcs(self->aq_hw)) {
if (num_tc > tcs_max) {
netdev_err(self->ndev, "Too many TCs requested\n");
return -EOPNOTSUPP;
}

78
drivers/net/ethernet/aquantia/atlantic/aq_nic.c
View File

@ -65,6 +65,33 @@ static void aq_nic_rss_init(struct aq_nic_s *self, unsigned int num_rss_queues)
rss_params->indirection_table[i] = i & (num_rss_queues - 1);
}
/* Recalculate the number of vectors */
static void aq_nic_cfg_update_num_vecs(struct aq_nic_s *self)
{
struct aq_nic_cfg_s *cfg = &self->aq_nic_cfg;
cfg->vecs = min(cfg->aq_hw_caps->vecs, AQ_CFG_VECS_DEF);
cfg->vecs = min(cfg->vecs, num_online_cpus());
if (self->irqvecs > AQ_HW_SERVICE_IRQS)
cfg->vecs = min(cfg->vecs, self->irqvecs - AQ_HW_SERVICE_IRQS);
/* cfg->vecs should be power of 2 for RSS */
cfg->vecs = rounddown_pow_of_two(cfg->vecs);
if (ATL_HW_IS_CHIP_FEATURE(self->aq_hw, ANTIGUA)) {
if (cfg->tcs > 2)
cfg->vecs = min(cfg->vecs, 4U);
}
if (cfg->vecs <= 4)
cfg->tc_mode = AQ_TC_MODE_8TCS;
else
cfg->tc_mode = AQ_TC_MODE_4TCS;
/*rss rings */
cfg->num_rss_queues = min(cfg->vecs, AQ_CFG_NUM_RSS_QUEUES_DEF);
aq_nic_rss_init(self, cfg->num_rss_queues);
}
/* Checks hw_caps and 'corrects' aq_nic_cfg in runtime */
void aq_nic_cfg_start(struct aq_nic_s *self)
{
@ -81,7 +108,6 @@ void aq_nic_cfg_start(struct aq_nic_s *self)
cfg->rxpageorder = AQ_CFG_RX_PAGEORDER;
cfg->is_rss = AQ_CFG_IS_RSS_DEF;
cfg->num_rss_queues = AQ_CFG_NUM_RSS_QUEUES_DEF;
cfg->aq_rss.base_cpu_number = AQ_CFG_RSS_BASE_CPU_NUM_DEF;
cfg->fc.req = AQ_CFG_FC_MODE;
cfg->wol = AQ_CFG_WOL_MODES;
@ -97,24 +123,7 @@ void aq_nic_cfg_start(struct aq_nic_s *self)
cfg->rxds = min(cfg->aq_hw_caps->rxds_max, AQ_CFG_RXDS_DEF);
cfg->txds = min(cfg->aq_hw_caps->txds_max, AQ_CFG_TXDS_DEF);
/*rss rings */
cfg->vecs = min(cfg->aq_hw_caps->vecs, AQ_CFG_VECS_DEF);
cfg->vecs = min(cfg->vecs, num_online_cpus());
if (self->irqvecs > AQ_HW_SERVICE_IRQS)
cfg->vecs = min(cfg->vecs, self->irqvecs - AQ_HW_SERVICE_IRQS);
/* cfg->vecs should be power of 2 for RSS */
if (cfg->vecs >= 8U)
cfg->vecs = 8U;
else if (cfg->vecs >= 4U)
cfg->vecs = 4U;
else if (cfg->vecs >= 2U)
cfg->vecs = 2U;
else
cfg->vecs = 1U;
cfg->num_rss_queues = min(cfg->vecs, AQ_CFG_NUM_RSS_QUEUES_DEF);
aq_nic_rss_init(self, cfg->num_rss_queues);
aq_nic_cfg_update_num_vecs(self);
cfg->irq_type = aq_pci_func_get_irq_type(self);
@ -125,11 +134,6 @@ void aq_nic_cfg_start(struct aq_nic_s *self)
cfg->vecs = 1U;
}
if (cfg->vecs <= 4)
cfg->tc_mode = AQ_TC_MODE_8TCS;
else
cfg->tc_mode = AQ_TC_MODE_4TCS;
/* Check if we have enough vectors allocated for
* link status IRQ. If no - we'll know link state from
* slower service task.
@ -1219,6 +1223,22 @@ void aq_nic_free_vectors(struct aq_nic_s *self)
err_exit:;
}
int aq_nic_realloc_vectors(struct aq_nic_s *self)
{
struct aq_nic_cfg_s *cfg = aq_nic_get_cfg(self);
aq_nic_free_vectors(self);
for (self->aq_vecs = 0; self->aq_vecs < cfg->vecs; self->aq_vecs++) {
self->aq_vec[self->aq_vecs] = aq_vec_alloc(self, self->aq_vecs,
cfg);
if (unlikely(!self->aq_vec[self->aq_vecs]))
return -ENOMEM;
}
return 0;
}
void aq_nic_shutdown(struct aq_nic_s *self)
{
int err = 0;
@ -1288,6 +1308,7 @@ void aq_nic_release_filter(struct aq_nic_s *self, enum aq_rx_filter_type type,
int aq_nic_setup_tc_mqprio(struct aq_nic_s *self, u32 tcs, u8 *prio_tc_map)
{
struct aq_nic_cfg_s *cfg = &self->aq_nic_cfg;
const unsigned int prev_vecs = cfg->vecs;
bool ndev_running;
int err = 0;
int i;
@ -1319,9 +1340,18 @@ int aq_nic_setup_tc_mqprio(struct aq_nic_s *self, u32 tcs, u8 *prio_tc_map)
netdev_set_num_tc(self->ndev, cfg->tcs);
/* Changing the number of TCs might change the number of vectors */
aq_nic_cfg_update_num_vecs(self);
if (prev_vecs != cfg->vecs) {
err = aq_nic_realloc_vectors(self);
if (err)
goto err_exit;
}
if (ndev_running)
err = dev_open(self->ndev, NULL);
err_exit:
return err;
}

1
drivers/net/ethernet/aquantia/atlantic/aq_nic.h
View File

@ -177,6 +177,7 @@ void aq_nic_deinit(struct aq_nic_s *self, bool link_down);
void aq_nic_set_power(struct aq_nic_s *self);
void aq_nic_free_hot_resources(struct aq_nic_s *self);
void aq_nic_free_vectors(struct aq_nic_s *self);
int aq_nic_realloc_vectors(struct aq_nic_s *self);
int aq_nic_set_mtu(struct aq_nic_s *self, int new_mtu);
int aq_nic_set_mac(struct aq_nic_s *self, struct net_device *ndev);
int aq_nic_set_packet_filter(struct aq_nic_s *self, unsigned int flags);