Date: Thu, 22 Dec 2016 10:11:03 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r310387 - head/sys/dev/mlx5/mlx5_en Message-ID: <201612221011.uBMAB3vW072109@repo.freebsd.org>
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Author: hselasky Date: Thu Dec 22 10:11:03 2016 New Revision: 310387 URL: https://svnweb.freebsd.org/changeset/base/310387 Log: Add more comments regarding collection of statistics counters. Sponsored by: Mellanox Technologies MFC after: 1 week Modified: head/sys/dev/mlx5/mlx5_en/mlx5_en_main.c Modified: head/sys/dev/mlx5/mlx5_en/mlx5_en_main.c ============================================================================== --- head/sys/dev/mlx5/mlx5_en/mlx5_en_main.c Thu Dec 22 05:57:45 2016 (r310386) +++ head/sys/dev/mlx5/mlx5_en/mlx5_en_main.c Thu Dec 22 10:11:03 2016 (r310387) @@ -306,6 +306,12 @@ mlx5e_update_carrier_work(struct work_st 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 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 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) {
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