e1000: use common checksumming code
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4972 c046a42c-6fe2-441c-8c8c-71466251a162
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hw/e1000.c
20
hw/e1000.c
@ -279,26 +279,18 @@ flash_eerd_read(E1000State *s, int x)
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E1000_EEPROM_RW_REG_DONE | r;
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E1000_EEPROM_RW_REG_DONE | r;
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}
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}
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static unsigned int
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do_cksum(uint8_t *dp, uint8_t *de)
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{
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unsigned int bsum[2] = {0, 0}, i, sum;
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for (i = 1; dp < de; bsum[i^=1] += *dp++)
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;
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sum = (bsum[0] << 8) + bsum[1];
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sum = (sum >> 16) + (sum & 0xffff);
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return ~(sum + (sum >> 16));
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}
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static void
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static void
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putsum(uint8_t *data, uint32_t n, uint32_t sloc, uint32_t css, uint32_t cse)
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putsum(uint8_t *data, uint32_t n, uint32_t sloc, uint32_t css, uint32_t cse)
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{
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{
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uint32_t sum;
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if (cse && cse < n)
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if (cse && cse < n)
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n = cse + 1;
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n = cse + 1;
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if (sloc < n-1)
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if (sloc < n-1) {
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sum = net_checksum_add(n-css, data+css);
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cpu_to_be16wu((uint16_t *)(data + sloc),
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cpu_to_be16wu((uint16_t *)(data + sloc),
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do_cksum(data + css, data + n));
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net_checksum_finish(sum));
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}
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}
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}
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static void
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static void
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