diff options
Diffstat (limited to 'sys/pci/if_rlreg.h')
| -rw-r--r-- | sys/pci/if_rlreg.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/pci/if_rlreg.h b/sys/pci/if_rlreg.h index 9456433744bb..a5e5f123e9f7 100644 --- a/sys/pci/if_rlreg.h +++ b/sys/pci/if_rlreg.h @@ -750,6 +750,14 @@ struct rl_stats { #define RL_ADDR_LO(y) ((uint64_t) (y) & 0xFFFFFFFF) #define RL_ADDR_HI(y) ((uint64_t) (y) >> 32) +/* + * The number of bits reserved for MSS in RealTek controllers is + * 11bits. This limits the maximum interface MTU size in TSO case + * as upper stack should not generate TCP segments with MSS greater + * than the limit. + */ +#define RL_TSO_MTU (2047 - ETHER_HDR_LEN - ETHER_CRC_LEN) + /* see comment in dev/re/if_re.c */ #define RL_JUMBO_FRAMELEN 7440 #define RL_JUMBO_MTU (RL_JUMBO_FRAMELEN-ETHER_HDR_LEN-ETHER_CRC_LEN) |