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sfc: allocate more RX buffers per page

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Allocating 2 buffers per page is insanely inefficient when MTU is 1500
and PAGE_SIZE is 64K (as it usually is on POWER).  Allocate as many as
we can fit, and choose the refill batch size at run-time so that we
still always use a whole page at once.

[bwh: Fix loop condition to allow for compound pages; rebase]
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Daniel Pieczko 2013-02-13 10:54:41 +00:00 • committed by Ben Hutchings
parent 179ea7f039
commit 1648a23fa1
4 changed files with 56 additions and 45 deletions
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2
drivers/net/ethernet/sfc/net_driver.h
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@ -825,7 +825,9 @@ struct efx_nic {
unsigned int rx_dma_len;
unsigned int rx_buffer_order;
unsigned int rx_buffer_truesize;
unsigned int rx_page_buf_step;
unsigned int rx_bufs_per_page;
unsigned int rx_pages_per_batch;
u8 rx_hash_key[40];
u32 rx_indir_table[128];
bool rx_scatter;