Some values are needed for implementing IEEE1588 on 82599 NIC.

[idata]

I am trying to porting the BSD source codes for IEEE 1588 supports on 82599 NIC.

This is the URL of my reference code.

http://gitorious.org/freebsd/freebsd/blobs/9a6ef67a282598a5250072b04fc418d5b6f9e72c/sys/dev/ixgbe/ixgbe.c http://gitorious.org/freebsd/freebsd/blobs/9a6ef67a282598a5250072b04fc418d5b6f9e72c/sys/dev/ixgbe/ixgbe.c

I can't get any idea about the below red values.

I think somebody should know about these values, because you have already supported the hwtstamp for 82580 and 82576 on Ubunt Server.

Is there anyone who can tell me the right values and who can explain what this codes mean?

516 # ifdef IXGBE_IEEE1588

/* Setup the timer : IEEE 1588 support */ adapter->cycles.read = ixgbe_read_clock; adapter->cycles.mask = (u64)-1; adapter->cycles.mult = 1; adapter->cycles.shift = IXGBE_TSYNC_SHIFT;

IXGBE_WRITE_REG(&adapter->hw, IXGBE_TIMINCA, (1<<24) |<p> 

IXGBE_TSYNC_CYCLE_TIME * IXGBE_TSYNC_SHIFT);

IXGBE_WRITE_REG(&adapter->hw, IXGBE_SYSTIML, 0x00000000);

527 IXGBE_WRITE_REG(&adapter->hw, IXGBE_SYSTIMH, 0xFF800000);

And these are the partial source codes of the Ubuntu's Intel igb driver. (Ubuntu11.04 and the kernel version is 2.6.38)

from the igb.h

335 # define IGB_82576_TSYNC_SHIFT 19

336 # define IGB_82580_TSYNC_SHIFT 24

from the igb_main.c

2157 /**

2158 * igb_init_hw_timer - Initialize hardware timer used with IEEE 1588 timestamp2159 * @adapter: board private structure to initialize2160 *2161 * igb_init_hw_timer initializes the function pointer and values for the hw2162 * timer found in hardware.2163 **/2164 static void igb_init_hw_timer(struct igb_adapter *adapter)2165 {2166 struct e1000_hw *hw = &adapter->hw;2167 2168 switch (hw->mac.type) {2169 case e1000_i350:2170 case e1000_82580:2171 memset(&adapter->cycles, 0, sizeof(adapter->cycles));2172 adapter->cycles.read = igb_read_clock;2173 adapter->cycles.mask = CLOCKSOURCE_MASK(64);2174 adapter->cycles.mult = 1;2175 /*2176 * The 82580 timesync updates the system timer every 8ns by 8ns2177 * and the value cannot be shifted. Instead we need to shift2178 * the registers to generate a 64bit timer value. As a result2179 * SYSTIMR/L/H, TXSTMPL/H, RXSTMPL/H all have to be shifted by2180 * 24 in order to generate a larger value for synchronization.2181 */2182 adapter->cycles.shift = IGB_82580_TSYNC_SHIFT;2183 /* disable system timer temporarily by setting bit 31 */2184 wr32(E1000_TSAUXC, 0x80000000);2185 wrfl();2186 2187 /* Set registers so that rollover occurs soon to test this. */2188 wr32(E1000_SYSTIMR, 0x00000000);2189 wr32(E1000_SYSTIML, 0x80000000);2190 wr32(E1000_SYSTIMH, 0x000000FF);2191 wrfl();2192 2193 /* enable system timer by clearing bit 31 */2194 wr32(E1000_TSAUXC, 0x0);2195 wrfl();2196 2197 timecounter_init(&adapter->clock,2198 &adapter->cycles,2199 ktime_to_ns(ktime_get_real()));2200 /*2201 * Synchronize our NIC clock against system wall clock. NIC2202 * time stamp reading requires ~3us per sample, each sample2203 * was pretty stable even under load => only require 102204 * samples for each offset comparison.2205 */2206 memset(&adapter->compare, 0, sizeof(adapter->compare));2207 adapter->compare.source = &adapter->clock;2208 adapter->compare.target = ktime_get_real;2209 adapter->compare.num_samples = 10;2210 timecompare_update(&adapter->compare, 0);2211 break;2212 case e1000_82576:2213 /*2214 * Initialize hardware timer: we keep it running just in case2215 * that some program needs it later on.2216 */2217 memset(&adapter->cycles, 0, sizeof(adapter->cycles));2218 adapter->cycles.read = igb_read_clock;2219 adapter->cycles.mask = CLOCKSOURCE_MASK(64);2220 adapter->cycles.mult = 1;2221 /**2222 * Scale the NIC clock cycle by a large factor so that2223 * relatively small clock corrections can be added or2224 * substracted at each clock tick. The drawbacks of a large2225 * factor are a) that the clock register overflows more quickly2226 * (not such a big deal) and b) that the increment per tick has2227 * to fit into 24 bits. As a result we need to use a shift of2228 * 19 so we can fit a value of 16 into the TIMINCA register.22...