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gianfar: remove largely unused gfar_stats struct
The gfar_stats struct is only used in copying out data via ethtool. It is declared as the extra stats, followed by the rmon stats. However, the rmon stats are never actually ever used in the driver; instead the rmon data is a u32 register read that is cast directly into the ethtool buf. It seems the only reason rmon is in the struct at all is to give the offset(s) at which it should be exported into the ethtool buffer. But note gfar_stats doesn't contain a gfar_extra_stats as a substruct -- instead it contains a u64 array of equal element count. This implicitly means we have two independent declarations of what gfar_extra_stats really is. Rather than have this duality, we already have defines which give us the offset directly, and hence do not need the struct at all. Further, since we know the extra_stats is unconditionally always present, we can write it out to the ethtool buf 1st, and then optionally write out the rmon data. There is no need for two independent loops, both of which are simply copying out the extra_stats to buf offset zero. This also helps pave the way towards allowing the extra stats fields to be converted to atomic64_t values, without having their types directly influencing the ethtool stats export code (gfar_fill_stats) that expects to deal with u64. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
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2 changed files with 7 additions and 16 deletions
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@ -646,15 +646,9 @@ struct gfar_extra_stats {
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#define GFAR_RMON_LEN ((sizeof(struct rmon_mib) - 16)/sizeof(u32))
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#define GFAR_EXTRA_STATS_LEN (sizeof(struct gfar_extra_stats)/sizeof(u64))
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/* Number of stats in the stats structure (ignore car and cam regs)*/
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/* Number of stats exported via ethtool */
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#define GFAR_STATS_LEN (GFAR_RMON_LEN + GFAR_EXTRA_STATS_LEN)
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struct gfar_stats {
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u64 extra[GFAR_EXTRA_STATS_LEN];
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u64 rmon[GFAR_RMON_LEN];
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};
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struct gfar {
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u32 tsec_id; /* 0x.000 - Controller ID register */
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u32 tsec_id2; /* 0x.004 - Controller ID2 register */
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@ -151,18 +151,15 @@ static void gfar_fill_stats(struct net_device *dev, struct ethtool_stats *dummy,
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struct gfar __iomem *regs = priv->gfargrp[0].regs;
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u64 *extra = (u64 *) & priv->extra_stats;
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for (i = 0; i < GFAR_EXTRA_STATS_LEN; i++)
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buf[i] = extra[i];
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if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
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u32 __iomem *rmon = (u32 __iomem *) ®s->rmon;
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struct gfar_stats *stats = (struct gfar_stats *) buf;
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for (i = 0; i < GFAR_RMON_LEN; i++)
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stats->rmon[i] = (u64) gfar_read(&rmon[i]);
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for (i = 0; i < GFAR_EXTRA_STATS_LEN; i++)
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stats->extra[i] = extra[i];
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} else
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for (i = 0; i < GFAR_EXTRA_STATS_LEN; i++)
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buf[i] = extra[i];
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for (; i < GFAR_STATS_LEN; i++, rmon++)
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buf[i] = (u64) gfar_read(rmon);
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}
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}
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static int gfar_sset_count(struct net_device *dev, int sset)
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