mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
f06d0ca458
While using net_dim, a dim_sample was used without ever initializing the
comps value. Added use of DIV_ROUND_DOWN_ULL() to prevent potential
overflow, it should not be a problem to save the final result in an int
because after the division by epms the value should not be larger than a
few thousand.
[ 1040.127124] UBSAN: Undefined behaviour in lib/dim/dim.c:78:23
[ 1040.130118] signed integer overflow:
[ 1040.131643] 134718714 * 100 cannot be represented in type 'int'
Fixes: 398c2b05bb ("linux/dim: Add completions count to dim_sample")
Signed-off-by: Yamin Friedman <yaminf@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
|
|
/*
|
|
* Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/dim.h>
|
|
|
|
bool dim_on_top(struct dim *dim)
|
|
{
|
|
switch (dim->tune_state) {
|
|
case DIM_PARKING_ON_TOP:
|
|
case DIM_PARKING_TIRED:
|
|
return true;
|
|
case DIM_GOING_RIGHT:
|
|
return (dim->steps_left > 1) && (dim->steps_right == 1);
|
|
default: /* DIM_GOING_LEFT */
|
|
return (dim->steps_right > 1) && (dim->steps_left == 1);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(dim_on_top);
|
|
|
|
void dim_turn(struct dim *dim)
|
|
{
|
|
switch (dim->tune_state) {
|
|
case DIM_PARKING_ON_TOP:
|
|
case DIM_PARKING_TIRED:
|
|
break;
|
|
case DIM_GOING_RIGHT:
|
|
dim->tune_state = DIM_GOING_LEFT;
|
|
dim->steps_left = 0;
|
|
break;
|
|
case DIM_GOING_LEFT:
|
|
dim->tune_state = DIM_GOING_RIGHT;
|
|
dim->steps_right = 0;
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(dim_turn);
|
|
|
|
void dim_park_on_top(struct dim *dim)
|
|
{
|
|
dim->steps_right = 0;
|
|
dim->steps_left = 0;
|
|
dim->tired = 0;
|
|
dim->tune_state = DIM_PARKING_ON_TOP;
|
|
}
|
|
EXPORT_SYMBOL(dim_park_on_top);
|
|
|
|
void dim_park_tired(struct dim *dim)
|
|
{
|
|
dim->steps_right = 0;
|
|
dim->steps_left = 0;
|
|
dim->tune_state = DIM_PARKING_TIRED;
|
|
}
|
|
EXPORT_SYMBOL(dim_park_tired);
|
|
|
|
void dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
|
|
struct dim_stats *curr_stats)
|
|
{
|
|
/* u32 holds up to 71 minutes, should be enough */
|
|
u32 delta_us = ktime_us_delta(end->time, start->time);
|
|
u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
|
|
u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
|
|
start->byte_ctr);
|
|
u32 ncomps = BIT_GAP(BITS_PER_TYPE(u32), end->comp_ctr,
|
|
start->comp_ctr);
|
|
|
|
if (!delta_us)
|
|
return;
|
|
|
|
curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
|
|
curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
|
|
curr_stats->epms = DIV_ROUND_UP(DIM_NEVENTS * USEC_PER_MSEC,
|
|
delta_us);
|
|
curr_stats->cpms = DIV_ROUND_UP(ncomps * USEC_PER_MSEC, delta_us);
|
|
if (curr_stats->epms != 0)
|
|
curr_stats->cpe_ratio = DIV_ROUND_DOWN_ULL(
|
|
curr_stats->cpms * 100, curr_stats->epms);
|
|
else
|
|
curr_stats->cpe_ratio = 0;
|
|
|
|
}
|
|
EXPORT_SYMBOL(dim_calc_stats);
|