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Date: Wed, 22 Jun 2011 11:29:32 +0200
From: "Sebastian Pöhn" <sebastian.belden@...glemail.com>
To: Joe Perches <joe@...ches.com>
Cc: Sebastian Pöhn <sebastian.poehn@...den.com>,
Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] gianfar v5: implement nfc
First of all thanks for the feedback. I know the fgar_swap_*bits
function is a bit ugly. The problem with your suggestion is that it is
necessary to swap a1<>a2 and b1<>b2 AT THE SAME TIME. Otherwise
information the second swap is needing is swapped away by the first one.
If you would do this as a macro I guess it will be blown up and be as
bad as it is at the moment:
#define swap_bits(a, b, c, d, bits) \
do { \
typeof(a) _bits = bits; \
typeof(a) _a_bits = (a) & _bits; \
typeof(a) _b_bits = (b) & _bits; \
typeof(a) _c_bits = (c) & _bits; \
typeof(a) _d_bits = (d) & _bits; \
\
(a) &= ~_bits; \
(b) &= ~_bits; \
(c) &= ~_bits; \
(d) &= ~_bits; \
\
(a) |= _b_bits; \
(b) |= _a_bits; \
(c) |= _d_bits; \
(d) |= _c_bits; \
} while (0)
> > +/* Swaps the 0xFF80 masked bits of a1<>a2 and b1<>b2 */
> > +static void gfar_swap_ff80_bits(struct gfar_filer_entry *a1,
> > + struct gfar_filer_entry *a2, struct gfar_filer_entry *b1,
> > + struct gfar_filer_entry *b2)
> > +{
> > + u32 temp[4];
> > + temp[0] = a1->ctrl & 0xFF80;
> > + temp[1] = a2->ctrl & 0xFF80;
> > + temp[2] = b1->ctrl & 0xFF80;
> > + temp[3] = b2->ctrl & 0xFF80;
> > +
> > + a1->ctrl &= ~0xFF80;
> > + a2->ctrl &= ~0xFF80;
> > + b1->ctrl &= ~0xFF80;
> > + b2->ctrl &= ~0xFF80;
> > +
> > + a1->ctrl |= temp[1];
> > + a2->ctrl |= temp[0];
> > + b1->ctrl |= temp[3];
> > + b2->ctrl |= temp[2];
> > +}
>
> maybe add a macro similar to swap:
>
> #define swap_bits(a, b, bits) \
> do { \
> typeof(a) _bits = bits; \
> typeof(a) _a_bits = (a) & _bits; \
> typeof(a) _b_bits = (b) & _bits; \
> \
> (a) &= ~_bits; \
> (b) &= ~_bits; \
> \
> (a) |= _b_bits; \
> (b) |= _a_bits; \
> } while (0)
>
> and use this macro directly in gfar_sort_mask_table?
>
> swap_bits(temp_table->fe[new_first],
> temp_table->fe[old_first], 0xff80);
> swap_bits(temp_table->fe[new_last],
> temp_table->fe[old_last], 0xff80);
>
> And maybe 0xff80 should be a #define?
Signed-off-by: Sebastian Poehn <sebastian.poehn@...den.com>
---
drivers/net/gianfar.h | 1 +
drivers/net/gianfar_ethtool.c | 29 ++++++++++++++++-------------
2 files changed, 17 insertions(+), 13 deletions(-)
diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index 76f14d0..27499c6 100644
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -409,6 +409,7 @@ extern const char gfar_driver_version[];
#define RQFCR_HASHTBL_2 0x00060000
#define RQFCR_HASHTBL_3 0x00080000
#define RQFCR_HASH 0x00010000
+#define RQFCR_QUEUE 0x0000FC00
#define RQFCR_CLE 0x00000200
#define RQFCR_RJE 0x00000100
#define RQFCR_AND 0x00000080
diff --git a/drivers/net/gianfar_ethtool.c b/drivers/net/gianfar_ethtool.c
index 2ecdc9a..ee93bb8 100644
--- a/drivers/net/gianfar_ethtool.c
+++ b/drivers/net/gianfar_ethtool.c
@@ -1262,21 +1262,21 @@ static void gfar_cluster_filer(struct filer_table *tab)
}
}
-/* Swaps the 0xFF80 masked bits of a1<>a2 and b1<>b2 */
-static void gfar_swap_ff80_bits(struct gfar_filer_entry *a1,
+/* Swaps the masked bits of a1<>a2 and b1<>b2 */
+static void gfar_swap_bits(struct gfar_filer_entry *a1,
struct gfar_filer_entry *a2, struct gfar_filer_entry *b1,
- struct gfar_filer_entry *b2)
+ struct gfar_filer_entry *b2, u32 mask)
{
u32 temp[4];
- temp[0] = a1->ctrl & 0xFF80;
- temp[1] = a2->ctrl & 0xFF80;
- temp[2] = b1->ctrl & 0xFF80;
- temp[3] = b2->ctrl & 0xFF80;
+ temp[0] = a1->ctrl & mask;
+ temp[1] = a2->ctrl & mask;
+ temp[2] = b1->ctrl & mask;
+ temp[3] = b2->ctrl & mask;
- a1->ctrl &= ~0xFF80;
- a2->ctrl &= ~0xFF80;
- b1->ctrl &= ~0xFF80;
- b2->ctrl &= ~0xFF80;
+ a1->ctrl &= ~mask;
+ a2->ctrl &= ~mask;
+ b1->ctrl &= ~mask;
+ b2->ctrl &= ~mask;
a1->ctrl |= temp[1];
a2->ctrl |= temp[0];
@@ -1356,10 +1356,13 @@ static void gfar_sort_mask_table(struct gfar_mask_entry *mask_table,
new_first = mask_table[start].start + 1;
new_last = mask_table[i - 1].end;
- gfar_swap_ff80_bits(&temp_table->fe[new_first],
+ gfar_swap_bits(&temp_table->fe[new_first],
&temp_table->fe[old_first],
&temp_table->fe[new_last],
- &temp_table->fe[old_last]);
+ &temp_table->fe[old_last],
+ RQFCR_QUEUE | RQFCR_CLE |
+ RQFCR_RJE | RQFCR_AND
+ );
start = i;
size = 0;
--
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