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sfc: Reduce RX scatter buffer size, and reduce alignment if appropriate

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efx_start_datapath() asserts that we can fit 2 RX scatter buffers plus
a software structure, each appropriately aligned, into a single page.
Where L1_CACHE_BYTES == 256 and PAGE_SIZE == 4096, which is the case
on s390, this assertion fails.

The current scatter buffer size is also not a multiple of 64 or 128,
which are more common cache line sizes.  If we can make both the start
and end of a scatter buffer cache-aligned, this will reduce the need
for read-modify-write operations on inter- processor links.

Fix the alignment by reducing EFX_RX_USR_BUF_SIZE to 2048 - 256 ==
1792.  (We could use 2048 - L1_CACHE_BYTES, but EFX_RX_USR_BUF_SIZE
also affects user-level networking where a larger amount of
housekeeping data may be needed.  Although this version of the driver
does not support user-level networking, I prefer to keep scattering
behaviour consistent with the out-of-tree version.)

This still doesn't fix the s390 build because like most architectures
it has NET_IP_ALIGN == 2.  When NET_IP_ALIGN != 0 we cannot achieve
cache line alignment at either the start or end of a scatter buffer,
so there is actually no point in padding the buffers to a multiple of
the cache line size.  All we need is 4-byte alignment of the network
header, so do that.

Adjust the assertions accordingly.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2013-05-13 12:01:22 +00:00 • committed by David S. Miller
parent c14ff2ea2d
commit 950c54df1e
3 changed files with 19 additions and 5 deletions
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16
drivers/net/ethernet/sfc/net_driver.h
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@ -72,8 +72,20 @@
/* Maximum possible MTU the driver supports */
#define EFX_MAX_MTU (9 * 1024)
/* Size of an RX scatter buffer. Small enough to pack 2 into a 4K page. */
#define EFX_RX_USR_BUF_SIZE 1824
/* Size of an RX scatter buffer. Small enough to pack 2 into a 4K page,
* and should be a multiple of the cache line size.
*/
#define EFX_RX_USR_BUF_SIZE (2048 - 256)
/* If possible, we should ensure cache line alignment at start and end
* of every buffer. Otherwise, we just need to ensure 4-byte
* alignment of the network header.
*/
#if NET_IP_ALIGN == 0
#define EFX_RX_BUF_ALIGNMENT L1_CACHE_BYTES
#else
#define EFX_RX_BUF_ALIGNMENT 4
#endif
/* Forward declare Precision Time Protocol (PTP) support structure. */
struct efx_ptp_data;