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ice: Pull out page reuse checks onto separate function 

Introduce ice_can_reuse_rx_page which will verify whether the page can
be reused and return the boolean result to caller.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Maciej Fijalkowski 2019-02-13 10:51:02 -08:00 committed by Jeff Kirsher
parent 6c869cb7a8
commit bbb97808a0
1 changed files with 45 additions and 35 deletions
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80
drivers/net/ethernet/intel/ice/ice_txrx.c
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@ -496,6 +496,48 @@ static bool ice_page_is_reserved(struct page *page)
return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
}
/**
* ice_can_reuse_rx_page - Determine if page can be reused for another Rx
* @rx_buf: buffer containing the page
* @truesize: the offset that needs to be applied to page
*
* If page is reusable, we have a green light for calling ice_reuse_rx_page,
* which will assign the current buffer to the buffer that next_to_alloc is
* pointing to; otherwise, the DMA mapping needs to be destroyed and
* page freed
*/
static bool ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf,
unsigned int truesize)
{
struct page *page = rx_buf->page;
/* avoid re-using remote pages */
if (unlikely(ice_page_is_reserved(page)))
return false;
#if (PAGE_SIZE < 8192)
/* if we are only owner of page we can reuse it */
if (unlikely(page_count(page) != 1))
return false;
/* flip page offset to other buffer */
rx_buf->page_offset ^= truesize;
#else
/* move offset up to the next cache line */
rx_buf->page_offset += truesize;
if (rx_buf->page_offset > PAGE_SIZE - ICE_RXBUF_2048)
return false;
#endif /* PAGE_SIZE < 8192) */
/* Even if we own the page, we are not allowed to use atomic_set()
* This would break get_page_unless_zero() users.
*/
get_page(page);
return true;
}
/**
* ice_add_rx_frag - Add contents of Rx buffer to sk_buff
* @rx_buf: buffer containing page to add
@ -517,17 +559,9 @@ ice_add_rx_frag(struct ice_rx_buf *rx_buf, struct sk_buff *skb,
#if (PAGE_SIZE < 8192)
unsigned int truesize = ICE_RXBUF_2048;
#else
unsigned int last_offset = PAGE_SIZE - ICE_RXBUF_2048;
unsigned int truesize;
unsigned int truesize = ALIGN(size, L1_CACHE_BYTES);
#endif /* PAGE_SIZE < 8192) */
struct page *page;
page = rx_buf->page;
#if (PAGE_SIZE >= 8192)
truesize = ALIGN(size, L1_CACHE_BYTES);
#endif /* PAGE_SIZE >= 8192) */
struct page *page = rx_buf->page;
/* will the data fit in the skb we allocated? if so, just
* copy it as it is pretty small anyway
@ -549,31 +583,7 @@ ice_add_rx_frag(struct ice_rx_buf *rx_buf, struct sk_buff *skb,
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
rx_buf->page_offset, size, truesize);
/* avoid re-using remote pages */
if (unlikely(ice_page_is_reserved(page)))
return false;
#if (PAGE_SIZE < 8192)
/* if we are only owner of page we can reuse it */
if (unlikely(page_count(page) != 1))
return false;
/* flip page offset to other buffer */
rx_buf->page_offset ^= truesize;
#else
/* move offset up to the next cache line */
rx_buf->page_offset += truesize;
if (rx_buf->page_offset > last_offset)
return false;
#endif /* PAGE_SIZE < 8192) */
/* Even if we own the page, we are not allowed to use atomic_set()
* This would break get_page_unless_zero() users.
*/
get_page(rx_buf->page);
return true;
return ice_can_reuse_rx_page(rx_buf, truesize);
}
/**