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myri10ge: optimize 4k-boundary check when stocking rx pages

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Small optimization to the code which checks to see if we'd cross
a 4K boundary when stocking RX ring.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Andrew Gallatin <gallatin@myri.com>
Signed-off-by: Guillaume Morin <guillaume@morinfr.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Brice Goglin 2010-02-24 12:11:19 +00:00 committed by David S. Miller
parent 45bb006090
commit 2a3f279034
1 changed files with 7 additions and 4 deletions
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11
drivers/net/myri10ge/myri10ge.c
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@ -77,7 +77,7 @@
#include "myri10ge_mcp.h"
#include "myri10ge_mcp_gen_header.h"
#define MYRI10GE_VERSION_STR "1.5.1-1.453"
#define MYRI10GE_VERSION_STR "1.5.2-1.459"
MODULE_DESCRIPTION("Myricom 10G driver (10GbE)");
MODULE_AUTHOR("Maintainer: help@myri.com");
@ -1200,6 +1200,9 @@ myri10ge_alloc_rx_pages(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
{
struct page *page;
int idx;
#if MYRI10GE_ALLOC_SIZE > 4096
int end_offset;
#endif
if (unlikely(rx->watchdog_needed && !watchdog))
return;
@ -1241,9 +1244,9 @@ myri10ge_alloc_rx_pages(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
#if MYRI10GE_ALLOC_SIZE > 4096
/* don't cross a 4KB boundary */
if ((rx->page_offset >> 12) !=
((rx->page_offset + bytes - 1) >> 12))
rx->page_offset = (rx->page_offset + 4096) & ~4095;
end_offset = rx->page_offset + bytes - 1;
if ((unsigned)(rx->page_offset ^ end_offset) > 4095)
rx->page_offset = end_offset & ~4095;
#endif
rx->fill_cnt++;