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Add more comments regarding collection of statistics counters.

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Sponsored by:	Mellanox Technologies
MFC after:	1 week
This commit is contained in:
Hans Petter Selasky 2016-12-22 10:11:03 +00:00
parent 066f8db8f3
commit 436659135a
1 changed files with 22 additions and 0 deletions
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22
sys/dev/mlx5/mlx5_en/mlx5_en_main.c
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@ -306,6 +306,12 @@ mlx5e_update_carrier_work(struct work_struct *work)
PRIV_UNLOCK(priv);
}
/*
* This function reads the physical port counters from the firmware
* using a pre-defined layout defined by various MLX5E_PPORT_XXX()
* macros. The output is converted from big-endian 64-bit values into
* host endian ones and stored in the "priv->stats.pport" structure.
*/
static void
mlx5e_update_pport_counters(struct mlx5e_priv *priv)
{
@ -319,20 +325,27 @@ mlx5e_update_pport_counters(struct mlx5e_priv *priv)
unsigned x;
unsigned y;
/* allocate firmware request structures */
in = mlx5_vzalloc(sz);
out = mlx5_vzalloc(sz);
if (in == NULL || out == NULL)
goto free_out;
/*
* Get pointer to the 64-bit counter set which is located at a
* fixed offset in the output firmware request structure:
*/
ptr = (uint64_t *)MLX5_ADDR_OF(ppcnt_reg, out, counter_set);
MLX5_SET(ppcnt_reg, in, local_port, 1);
/* read IEEE802_3 counter group using predefined counter layout */
MLX5_SET(ppcnt_reg, in, grp, MLX5_IEEE_802_3_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
for (x = y = 0; x != MLX5E_PPORT_IEEE802_3_STATS_NUM; x++, y++)
s->arg[y] = be64toh(ptr[x]);
/* read RFC2819 counter group using predefined counter layout */
MLX5_SET(ppcnt_reg, in, grp, MLX5_RFC_2819_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
for (x = 0; x != MLX5E_PPORT_RFC2819_STATS_NUM; x++, y++)
@ -341,20 +354,29 @@ mlx5e_update_pport_counters(struct mlx5e_priv *priv)
MLX5E_PPORT_RFC2819_STATS_DEBUG_NUM; x++, y++)
s_debug->arg[y] = be64toh(ptr[x]);
/* read RFC2863 counter group using predefined counter layout */
MLX5_SET(ppcnt_reg, in, grp, MLX5_RFC_2863_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
for (x = 0; x != MLX5E_PPORT_RFC2863_STATS_DEBUG_NUM; x++, y++)
s_debug->arg[y] = be64toh(ptr[x]);
/* read physical layer stats counter group using predefined counter layout */
MLX5_SET(ppcnt_reg, in, grp, MLX5_PHYSICAL_LAYER_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
for (x = 0; x != MLX5E_PPORT_PHYSICAL_LAYER_STATS_DEBUG_NUM; x++, y++)
s_debug->arg[y] = be64toh(ptr[x]);
free_out:
/* free firmware request structures */
kvfree(in);
kvfree(out);
}
/*
* This function is called regularly to collect all statistics
* counters from the firmware. The values can be viewed through the
* sysctl interface. Execution is serialized using the priv's global
* configuration lock.
*/
static void
mlx5e_update_stats_work(struct work_struct *work)
{