TCP_MAXSEG option with TSO enabled

Hello,

I am using TCP_MAXSEG option on an interface which has TSO enabled.

strace output for connection looks as follows:

socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 26
setsockopt(26, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
setsockopt(26, SOL_TCP, TCP_NODELAY, [1], 4) = 0
setsockopt(26, SOL_TCP, TCP_MAXSEG, [300], 4) = 0
connect(26, {sa_family=AF_INET, sin_port=htons(1935),
sin_addr=inet_addr("10.10.0.1")}, 16) = -1 EINPROGRESS (Operation now
in progress)

I can see that MSS (300) is advertised in SYN packet, anyhow capturing
the traffic
I notice that are some TCP segments with length greater than MSS.

Is this normal taking in consideration that TSO is enabled?

thanks,
Daniel.