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i40e: fix u64 division usage 

Commit 52eb1ff93e98 ("i40e: Add support setting TC max bandwidth rates")
and commit 1ea6f21ae530 ("i40e: Refactor VF BW rate limiting") add some
needed functionality for TC bandwidth rate limiting.  Unfortunately they
introduce several usages of unsigned 64-bit division which needs to be
handled special by the kernel to support all architectures.

Fixes: 52eb1ff93e98 ("i40e: Add support setting TC max bandwidth
rates")
Fixes: 1ea6f21ae530 ("i40e: Refactor VF BW rate limiting")

Signed-off-by: Alan Brady <alan.brady@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alan Brady 2017-10-09 15:48:45 -07:00 committed by Jeff Kirsher
parent cee919959b
commit 6c32e0d9fd
2 changed files with 42 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/intel/i40e/i40e.h
View File

@ -130,7 +130,8 @@
/* BW rate limiting */
#define I40E_BW_CREDIT_DIVISOR 50 /* 50Mbps per BW credit */
#define I40E_MAX_BW_INACTIVE_ACCUM 4 /* accumulate 4 credits max */
#define I40E_BW_MBPS_DIVISOR 125000 /* rate / (1000000 / 8) Mbps */
#define I40E_MAX_BW_INACTIVE_ACCUM 4 /* accumulate 4 credits max */
/* driver state flags */
enum i40e_state_t {

58
drivers/net/ethernet/intel/i40e/i40e_main.c
View File

@ -5442,6 +5442,7 @@ int i40e_get_link_speed(struct i40e_vsi *vsi)
int i40e_set_bw_limit(struct i40e_vsi *vsi, u16 seid, u64 max_tx_rate)
{
struct i40e_pf *pf = vsi->back;
u64 credits = 0;
int speed = 0;
int ret = 0;
@ -5459,8 +5460,9 @@ int i40e_set_bw_limit(struct i40e_vsi *vsi, u16 seid, u64 max_tx_rate)
}
/* Tx rate credits are in values of 50Mbps, 0 is disabled */
ret = i40e_aq_config_vsi_bw_limit(&pf->hw, seid,
max_tx_rate / I40E_BW_CREDIT_DIVISOR,
credits = max_tx_rate;
do_div(credits, I40E_BW_CREDIT_DIVISOR);
ret = i40e_aq_config_vsi_bw_limit(&pf->hw, seid, credits,
I40E_MAX_BW_INACTIVE_ACCUM, NULL);
if (ret)
dev_err(&pf->pdev->dev,
@ -6063,13 +6065,17 @@ int i40e_create_queue_channel(struct i40e_vsi *vsi,
/* configure VSI for BW limit */
if (ch->max_tx_rate) {
u64 credits = ch->max_tx_rate;
if (i40e_set_bw_limit(vsi, ch->seid, ch->max_tx_rate))
return -EINVAL;
do_div(credits, I40E_BW_CREDIT_DIVISOR);
dev_dbg(&pf->pdev->dev,
"Set tx rate of %llu Mbps (count of 50Mbps %llu) for vsi->seid %u\n",
ch->max_tx_rate,
ch->max_tx_rate / I40E_BW_CREDIT_DIVISOR, ch->seid);
credits,
ch->seid);
}
/* in case of VF, this will be main SRIOV VSI */
@ -6090,6 +6096,7 @@ int i40e_create_queue_channel(struct i40e_vsi *vsi,
static int i40e_configure_queue_channels(struct i40e_vsi *vsi)
{
struct i40e_channel *ch;
u64 max_rate = 0;
int ret = 0, i;
/* Create app vsi with the TCs. Main VSI with TC0 is already set up */
@ -6110,8 +6117,9 @@ static int i40e_configure_queue_channels(struct i40e_vsi *vsi)
/* Bandwidth limit through tc interface is in bytes/s,
* change to Mbit/s
*/
ch->max_tx_rate =
vsi->mqprio_qopt.max_rate[i] / (1000000 / 8);
max_rate = vsi->mqprio_qopt.max_rate[i];
do_div(max_rate, I40E_BW_MBPS_DIVISOR);
ch->max_tx_rate = max_rate;
list_add_tail(&ch->list, &vsi->ch_list);
@ -6540,6 +6548,7 @@ static int i40e_validate_mqprio_qopt(struct i40e_vsi *vsi,
struct tc_mqprio_qopt_offload *mqprio_qopt)
{
u64 sum_max_rate = 0;
u64 max_rate = 0;
int i;
if (mqprio_qopt->qopt.offset[0] != 0 ||
@ -6554,7 +6563,9 @@ static int i40e_validate_mqprio_qopt(struct i40e_vsi *vsi,
"Invalid min tx rate (greater than 0) specified\n");
return -EINVAL;
}
sum_max_rate += (mqprio_qopt->max_rate[i] / (1000000 / 8));
max_rate = mqprio_qopt->max_rate[i];
do_div(max_rate, I40E_BW_MBPS_DIVISOR);
sum_max_rate += max_rate;
if (i >= mqprio_qopt->qopt.num_tc - 1)
break;
@ -6698,14 +6709,18 @@ static int i40e_setup_tc(struct net_device *netdev, void *type_data)
if (pf->flags & I40E_FLAG_TC_MQPRIO) {
if (vsi->mqprio_qopt.max_rate[0]) {
u64 max_tx_rate = vsi->mqprio_qopt.max_rate[0] /
(1000000 / 8);
u64 max_tx_rate = vsi->mqprio_qopt.max_rate[0];
do_div(max_tx_rate, I40E_BW_MBPS_DIVISOR);
ret = i40e_set_bw_limit(vsi, vsi->seid, max_tx_rate);
if (!ret) {
u64 credits = max_tx_rate;
do_div(credits, I40E_BW_CREDIT_DIVISOR);
dev_dbg(&vsi->back->pdev->dev,
"Set tx rate of %llu Mbps (count of 50Mbps %llu) for vsi->seid %u\n",
max_tx_rate,
max_tx_rate / I40E_BW_CREDIT_DIVISOR,
credits,
vsi->seid);
} else {
need_reset = true;
@ -8166,14 +8181,17 @@ static int i40e_rebuild_channels(struct i40e_vsi *vsi)
return ret;
}
if (ch->max_tx_rate) {
u64 credits = ch->max_tx_rate;
if (i40e_set_bw_limit(vsi, ch->seid,
ch->max_tx_rate))
return -EINVAL;
do_div(credits, I40E_BW_CREDIT_DIVISOR);
dev_dbg(&vsi->back->pdev->dev,
"Set tx rate of %llu Mbps (count of 50Mbps %llu) for vsi->seid %u\n",
ch->max_tx_rate,
ch->max_tx_rate / I40E_BW_CREDIT_DIVISOR,
credits,
ch->seid);
}
}
@ -8446,17 +8464,21 @@ static void i40e_rebuild(struct i40e_pf *pf, bool reinit, bool lock_acquired)
}
if (vsi->mqprio_qopt.max_rate[0]) {
u64 max_tx_rate = vsi->mqprio_qopt.max_rate[0] / (1000000 / 8);
u64 max_tx_rate = vsi->mqprio_qopt.max_rate[0];
u64 credits = 0;
do_div(max_tx_rate, I40E_BW_MBPS_DIVISOR);
ret = i40e_set_bw_limit(vsi, vsi->seid, max_tx_rate);
if (!ret)
dev_dbg(&vsi->back->pdev->dev,
"Set tx rate of %llu Mbps (count of 50Mbps %llu) for vsi->seid %u\n",
max_tx_rate,
max_tx_rate / I40E_BW_CREDIT_DIVISOR,
vsi->seid);
else
if (ret)
goto end_unlock;
credits = max_tx_rate;
do_div(credits, I40E_BW_CREDIT_DIVISOR);
dev_dbg(&vsi->back->pdev->dev,
"Set tx rate of %llu Mbps (count of 50Mbps %llu) for vsi->seid %u\n",
max_tx_rate,
credits,
vsi->seid);
}
/* PF Main VSI is rebuild by now, go ahead and rebuild channel VSIs