Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:
 "Highlights:

   1) Steady transitioning of the BPF instructure to a generic spot so
      all kernel subsystems can make use of it, from Alexei Starovoitov.

   2) SFC driver supports busy polling, from Alexandre Rames.

   3) Take advantage of hash table in UDP multicast delivery, from David
      Held.

   4) Lighten locking, in particular by getting rid of the LRU lists, in
      inet frag handling.  From Florian Westphal.

   5) Add support for various RFC6458 control messages in SCTP, from
      Geir Ola Vaagland.

   6) Allow to filter bridge forwarding database dumps by device, from
      Jamal Hadi Salim.

   7) virtio-net also now supports busy polling, from Jason Wang.

   8) Some low level optimization tweaks in pktgen from Jesper Dangaard
      Brouer.

   9) Add support for ipv6 address generation modes, so that userland
      can have some input into the process.  From Jiri Pirko.

  10) Consolidate common TCP connection request code in ipv4 and ipv6,
      from Octavian Purdila.

  11) New ARP packet logger in netfilter, from Pablo Neira Ayuso.

  12) Generic resizable RCU hash table, with intial users in netlink and
      nftables.  From Thomas Graf.

  13) Maintain a name assignment type so that userspace can see where a
      network device name came from (enumerated by kernel, assigned
      explicitly by userspace, etc.) From Tom Gundersen.

  14) Automatic flow label generation on transmit in ipv6, from Tom
      Herbert.

  15) New packet timestamping facilities from Willem de Bruijn, meant to
      assist in measuring latencies going into/out-of the packet
      scheduler, latency from TCP data transmission to ACK, etc"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1536 commits)
  cxgb4 : Disable recursive mailbox commands when enabling vi
  net: reduce USB network driver config options.
  tg3: Modify tg3_tso_bug() to handle multiple TX rings
  amd-xgbe: Perform phy connect/disconnect at dev open/stop
  amd-xgbe: Use dma_set_mask_and_coherent to set DMA mask
  net: sun4i-emac: fix memory leak on bad packet
  sctp: fix possible seqlock seadlock in sctp_packet_transmit()
  Revert "net: phy: Set the driver when registering an MDIO bus device"
  cxgb4vf: Turn off SGE RX/TX Callback Timers and interrupts in PCI shutdown routine
  team: Simplify return path of team_newlink
  bridge: Update outdated comment on promiscuous mode
  net-timestamp: ACK timestamp for bytestreams
  net-timestamp: TCP timestamping
  net-timestamp: SCHED timestamp on entering packet scheduler
  net-timestamp: add key to disambiguate concurrent datagrams
  net-timestamp: move timestamp flags out of sk_flags
  net-timestamp: extend SCM_TIMESTAMPING ancillary data struct
  cxgb4i : Move stray CPL definitions to cxgb4 driver
  tcp: reduce spurious retransmits due to transient SACK reneging
  qlcnic: Initialize dcbnl_ops before register_netdev
  ...

1 files changed, 73 insertions, 80 deletions

diff --git a/lib/crc32.c b/lib/crc32.c
index 21a7b2135..9a907d4 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -50,34 +50,10 @@ MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>");
 MODULE_DESCRIPTION("Various CRC32 calculations");
 MODULE_LICENSE("GPL");
 
-#define GF2_DIM		32
-
-static u32 gf2_matrix_times(u32 *mat, u32 vec)
-{
-	u32 sum = 0;
-
-	while (vec) {
-		if (vec & 1)
-			sum ^= *mat;
-		vec >>= 1;
-		mat++;
-	}
-
-	return sum;
-}
-
-static void gf2_matrix_square(u32 *square, u32 *mat)
-{
-	int i;
-
-	for (i = 0; i < GF2_DIM; i++)
-		square[i] = gf2_matrix_times(mat, mat[i]);
-}
-
 #if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
 
 /* implements slicing-by-4 or slicing-by-8 algorithm */
-static inline u32
+static inline u32 __pure
 crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
 {
 # ifdef __LITTLE_ENDIAN
@@ -155,51 +131,6 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
 }
 #endif
 
-/* For conditions of distribution and use, see copyright notice in zlib.h */
-static u32 crc32_generic_combine(u32 crc1, u32 crc2, size_t len2,
-				 u32 polynomial)
-{
-	u32 even[GF2_DIM]; /* Even-power-of-two zeros operator */
-	u32 odd[GF2_DIM];  /* Odd-power-of-two zeros operator  */
-	u32 row;
-	int i;
-
-	if (len2 <= 0)
-		return crc1;
-
-	/* Put operator for one zero bit in odd */
-	odd[0] = polynomial;
-	row = 1;
-	for (i = 1; i < GF2_DIM; i++) {
-		odd[i] = row;
-		row <<= 1;
-	}
-
-	gf2_matrix_square(even, odd); /* Put operator for two zero bits in even */
-	gf2_matrix_square(odd, even); /* Put operator for four zero bits in odd */
-
-	/* Apply len2 zeros to crc1 (first square will put the operator for one
-	 * zero byte, eight zero bits, in even).
-	 */
-	do {
-		/* Apply zeros operator for this bit of len2 */
-		gf2_matrix_square(even, odd);
-		if (len2 & 1)
-			crc1 = gf2_matrix_times(even, crc1);
-		len2 >>= 1;
-		/* If no more bits set, then done */
-		if (len2 == 0)
-			break;
-		/* Another iteration of the loop with odd and even swapped */
-		gf2_matrix_square(odd, even);
-		if (len2 & 1)
-			crc1 = gf2_matrix_times(odd, crc1);
-		len2 >>= 1;
-	} while (len2 != 0);
-
-	crc1 ^= crc2;
-	return crc1;
-}
 
 /**
  * crc32_le_generic() - Calculate bitwise little-endian Ethernet AUTODIN II
@@ -271,19 +202,81 @@ u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
 			(const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE);
 }
 #endif
-u32 __pure crc32_le_combine(u32 crc1, u32 crc2, size_t len2)
+EXPORT_SYMBOL(crc32_le);
+EXPORT_SYMBOL(__crc32c_le);
+
+/*
+ * This multiplies the polynomials x and y modulo the given modulus.
+ * This follows the "little-endian" CRC convention that the lsbit
+ * represents the highest power of x, and the msbit represents x^0.
+ */
+static u32 __attribute_const__ gf2_multiply(u32 x, u32 y, u32 modulus)
 {
-	return crc32_generic_combine(crc1, crc2, len2, CRCPOLY_LE);
+	u32 product = x & 1 ? y : 0;
+	int i;
+
+	for (i = 0; i < 31; i++) {
+		product = (product >> 1) ^ (product & 1 ? modulus : 0);
+		x >>= 1;
+		product ^= x & 1 ? y : 0;
+	}
+
+	return product;
 }
 
-u32 __pure __crc32c_le_combine(u32 crc1, u32 crc2, size_t len2)
+/**
+ * crc32_generic_shift - Append len 0 bytes to crc, in logarithmic time
+ * @crc: The original little-endian CRC (i.e. lsbit is x^31 coefficient)
+ * @len: The number of bytes. @crc is multiplied by x^(8*@len)
+ * @polynomial: The modulus used to reduce the result to 32 bits.
+ *
+ * It's possible to parallelize CRC computations by computing a CRC
+ * over separate ranges of a buffer, then summing them.
+ * This shifts the given CRC by 8*len bits (i.e. produces the same effect
+ * as appending len bytes of zero to the data), in time proportional
+ * to log(len).
+ */
+static u32 __attribute_const__ crc32_generic_shift(u32 crc, size_t len,
+						   u32 polynomial)
 {
-	return crc32_generic_combine(crc1, crc2, len2, CRC32C_POLY_LE);
+	u32 power = polynomial;	/* CRC of x^32 */
+	int i;
+
+	/* Shift up to 32 bits in the simple linear way */
+	for (i = 0; i < 8 * (int)(len & 3); i++)
+		crc = (crc >> 1) ^ (crc & 1 ? polynomial : 0);
+
+	len >>= 2;
+	if (!len)
+		return crc;
+
+	for (;;) {
+		/* "power" is x^(2^i), modulo the polynomial */
+		if (len & 1)
+			crc = gf2_multiply(crc, power, polynomial);
+
+		len >>= 1;
+		if (!len)
+			break;
+
+		/* Square power, advancing to x^(2^(i+1)) */
+		power = gf2_multiply(power, power, polynomial);
+	}
+
+	return crc;
 }
-EXPORT_SYMBOL(crc32_le);
-EXPORT_SYMBOL(crc32_le_combine);
-EXPORT_SYMBOL(__crc32c_le);
-EXPORT_SYMBOL(__crc32c_le_combine);
+
+u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len)
+{
+	return crc32_generic_shift(crc, len, CRCPOLY_LE);
+}
+
+u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len)
+{
+	return crc32_generic_shift(crc, len, CRC32C_POLY_LE);
+}
+EXPORT_SYMBOL(crc32_le_shift);
+EXPORT_SYMBOL(__crc32c_le_shift);
 
 /**
  * crc32_be_generic() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32
@@ -351,7 +344,7 @@ EXPORT_SYMBOL(crc32_be);
 #ifdef CONFIG_CRC32_SELFTEST
 
 /* 4096 random bytes */
-static u8 __attribute__((__aligned__(8))) test_buf[] =
+static u8 const __aligned(8) test_buf[] __initconst =
 {
 	0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30,
 	0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4,
@@ -875,7 +868,7 @@ static struct crc_test {
 	u32 crc_le;	/* expected crc32_le result */
 	u32 crc_be;	/* expected crc32_be result */
 	u32 crc32c_le;	/* expected crc32c_le result */
-} test[] =
+} const test[] __initconst =
 {
 	{0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1, 0xf6e93d6c},
 	{0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad, 0x0fe92aca},