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cxgbe/t4_tom: Do not include space taken by the TCP timestamp option in

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the "effective MSS" for the connection.  The chip expects it this way.

Submitted by:	Krishnamraju Eraparaju @ Chelsio
MFC after:	3 days
Sponsored by:	Chelsio Communications
This commit is contained in:
np 2017-06-27 22:05:06 +00:00
parent 7b145758f3
commit 9b301f344f
1 changed files with 2 additions and 0 deletions
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2
sys/dev/cxgbe/tom/t4_cpl_io.c
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@ -332,6 +332,8 @@ assign_rxopt(struct tcpcb *tp, unsigned int opt)
n = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
else
n = sizeof(struct ip) + sizeof(struct tcphdr);
if (V_tcp_do_rfc1323)
n += TCPOLEN_TSTAMP_APPA;
tp->t_maxseg = sc->params.mtus[G_TCPOPT_MSS(opt)] - n;
CTR4(KTR_CXGBE, "%s: tid %d, mtu_idx %u (%u)", __func__, toep->tid,