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Date: Sat, 7 Jan 2017 21:06:30 +0800
From: kbuild test robot <lkp@...el.com>
To: Alexander Duyck <alexander.duyck@...il.com>
Cc: kbuild-all@...org, intel-wired-lan@...ts.osuosl.org,
jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org
Subject: Re: [next PATCH 04/11] ixgbe: Update code to better handle
incrementing page count
Hi Alexander,
[auto build test ERROR on jkirsher-next-queue/dev-queue]
[also build test ERROR on v4.10-rc2 next-20170106]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Alexander-Duyck/ixgbe-Add-support-for-writable-pages-and-build_skb/20170107-193738
base: https://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue.git dev-queue
config: alpha-allyesconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=alpha
All errors (new ones prefixed by >>):
In file included from drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:60:0:
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c: In function 'ixgbe_can_reuse_rx_page':
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:1960:46: error: 'rx_ring' undeclared (first use in this function)
unsigned int last_offset = ixgbe_rx_pg_size(rx_ring) -
^
drivers/net/ethernet/intel/ixgbe/ixgbe.h:371:65: note: in definition of macro 'ixgbe_rx_pg_size'
#define ixgbe_rx_pg_size(_ring) (PAGE_SIZE << ixgbe_rx_pg_order(_ring))
^~~~~
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:1960:46: note: each undeclared identifier is reported only once for each function it appears in
unsigned int last_offset = ixgbe_rx_pg_size(rx_ring) -
^
drivers/net/ethernet/intel/ixgbe/ixgbe.h:371:65: note: in definition of macro 'ixgbe_rx_pg_size'
#define ixgbe_rx_pg_size(_ring) (PAGE_SIZE << ixgbe_rx_pg_order(_ring))
^~~~~
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c: In function 'ixgbe_fetch_rx_buffer':
>> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:2124:3: error: implicit declaration of function '__page_frag_cache_drain' [-Werror=implicit-function-declaration]
__page_frag_cache_drain(page,
^~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +/__page_frag_cache_drain +2124 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
1954
1955 static bool ixgbe_can_reuse_rx_page(struct ixgbe_rx_buffer *rx_buffer,
1956 struct page *page,
1957 const unsigned int truesize)
1958 {
1959 #if (PAGE_SIZE >= 8192)
> 1960 unsigned int last_offset = ixgbe_rx_pg_size(rx_ring) -
1961 ixgbe_rx_bufsz(rx_ring);
1962 #endif
1963 unsigned int pagecnt_bias = rx_buffer->pagecnt_bias--;
1964
1965 /* avoid re-using remote pages */
1966 if (unlikely(ixgbe_page_is_reserved(page)))
1967 return false;
1968
1969 #if (PAGE_SIZE < 8192)
1970 /* if we are only owner of page we can reuse it */
1971 if (unlikely(page_count(page) != pagecnt_bias))
1972 return false;
1973
1974 /* flip page offset to other buffer */
1975 rx_buffer->page_offset ^= truesize;
1976 #else
1977 /* move offset up to the next cache line */
1978 rx_buffer->page_offset += truesize;
1979
1980 if (rx_buffer->page_offset > last_offset)
1981 return false;
1982 #endif
1983
1984 /* If we have drained the page fragment pool we need to update
1985 * the pagecnt_bias and page count so that we fully restock the
1986 * number of references the driver holds.
1987 */
1988 if (unlikely(pagecnt_bias == 1)) {
1989 page_ref_add(page, USHRT_MAX);
1990 rx_buffer->pagecnt_bias = USHRT_MAX;
1991 }
1992
1993 return true;
1994 }
1995
1996 /**
1997 * ixgbe_add_rx_frag - Add contents of Rx buffer to sk_buff
1998 * @rx_ring: rx descriptor ring to transact packets on
1999 * @rx_buffer: buffer containing page to add
2000 * @rx_desc: descriptor containing length of buffer written by hardware
2001 * @skb: sk_buff to place the data into
2002 *
2003 * This function will add the data contained in rx_buffer->page to the skb.
2004 * This is done either through a direct copy if the data in the buffer is
2005 * less than the skb header size, otherwise it will just attach the page as
2006 * a frag to the skb.
2007 *
2008 * The function will then update the page offset if necessary and return
2009 * true if the buffer can be reused by the adapter.
2010 **/
2011 static bool ixgbe_add_rx_frag(struct ixgbe_ring *rx_ring,
2012 struct ixgbe_rx_buffer *rx_buffer,
2013 unsigned int size,
2014 struct sk_buff *skb)
2015 {
2016 struct page *page = rx_buffer->page;
2017 unsigned char *va = page_address(page) + rx_buffer->page_offset;
2018 #if (PAGE_SIZE < 8192)
2019 unsigned int truesize = ixgbe_rx_bufsz(rx_ring);
2020 #else
2021 unsigned int truesize = ALIGN(size, L1_CACHE_BYTES);
2022 #endif
2023
2024 if (unlikely(skb_is_nonlinear(skb)))
2025 goto add_tail_frag;
2026
2027 if (size <= IXGBE_RX_HDR_SIZE) {
2028 memcpy(__skb_put(skb, size), va, ALIGN(size, sizeof(long)));
2029
2030 /* page is not reserved, we can reuse buffer as-is */
2031 if (likely(!ixgbe_page_is_reserved(page)))
2032 return true;
2033
2034 /* this page cannot be reused so discard it */
2035 return false;
2036 }
2037
2038 add_tail_frag:
2039 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
2040 rx_buffer->page_offset, size, truesize);
2041
2042 return ixgbe_can_reuse_rx_page(rx_buffer, page, truesize);
2043 }
2044
2045 static struct sk_buff *ixgbe_fetch_rx_buffer(struct ixgbe_ring *rx_ring,
2046 union ixgbe_adv_rx_desc *rx_desc)
2047 {
2048 unsigned int size = le16_to_cpu(rx_desc->wb.upper.length);
2049 struct ixgbe_rx_buffer *rx_buffer;
2050 struct sk_buff *skb;
2051 struct page *page;
2052
2053 rx_buffer = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
2054 page = rx_buffer->page;
2055 prefetchw(page);
2056
2057 skb = rx_buffer->skb;
2058
2059 if (likely(!skb)) {
2060 void *page_addr = page_address(page) +
2061 rx_buffer->page_offset;
2062
2063 /* prefetch first cache line of first page */
2064 prefetch(page_addr);
2065 #if L1_CACHE_BYTES < 128
2066 prefetch(page_addr + L1_CACHE_BYTES);
2067 #endif
2068
2069 /* allocate a skb to store the frags */
2070 skb = napi_alloc_skb(&rx_ring->q_vector->napi,
2071 IXGBE_RX_HDR_SIZE);
2072 if (unlikely(!skb)) {
2073 rx_ring->rx_stats.alloc_rx_buff_failed++;
2074 return NULL;
2075 }
2076
2077 /*
2078 * we will be copying header into skb->data in
2079 * pskb_may_pull so it is in our interest to prefetch
2080 * it now to avoid a possible cache miss
2081 */
2082 prefetchw(skb->data);
2083
2084 /*
2085 * Delay unmapping of the first packet. It carries the
2086 * header information, HW may still access the header
2087 * after the writeback. Only unmap it when EOP is
2088 * reached
2089 */
2090 if (likely(ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_EOP)))
2091 goto dma_sync;
2092
2093 IXGBE_CB(skb)->dma = rx_buffer->dma;
2094 } else {
2095 if (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_EOP))
2096 ixgbe_dma_sync_frag(rx_ring, skb);
2097
2098 dma_sync:
2099 /* we are reusing so sync this buffer for CPU use */
2100 dma_sync_single_range_for_cpu(rx_ring->dev,
2101 rx_buffer->dma,
2102 rx_buffer->page_offset,
2103 size,
2104 DMA_FROM_DEVICE);
2105
2106 rx_buffer->skb = NULL;
2107 }
2108
2109 /* pull page into skb */
2110 if (ixgbe_add_rx_frag(rx_ring, rx_buffer, size, skb)) {
2111 /* hand second half of page back to the ring */
2112 ixgbe_reuse_rx_page(rx_ring, rx_buffer);
2113 } else {
2114 if (IXGBE_CB(skb)->dma == rx_buffer->dma) {
2115 /* the page has been released from the ring */
2116 IXGBE_CB(skb)->page_released = true;
2117 } else {
2118 /* we are not reusing the buffer so unmap it */
2119 dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
2120 ixgbe_rx_pg_size(rx_ring),
2121 DMA_FROM_DEVICE,
2122 IXGBE_RX_DMA_ATTR);
2123 }
> 2124 __page_frag_cache_drain(page,
2125 rx_buffer->pagecnt_bias);
2126 }
2127
---
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