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if_ntb: Initialize if_mtu to the correct MTU

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Lower the payload data (IP) portion of the MTU from 0x10000 to
IP_MAXPACKET (0xFFFF) to avoid panicing the IP stack.

Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
Conrad Meyer 2015-11-19 19:53:19 +00:00
parent f51a1fe048
commit 70bca634d0
1 changed files with 6 additions and 1 deletions
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7
sys/dev/ntb/if_ntb/if_ntb.c
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@ -59,6 +59,9 @@ __FBSDID("$FreeBSD$");
#include <machine/cpufunc.h>
#include <machine/pmap.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include "../ntb_hw/ntb_hw.h"
/*
@ -101,7 +104,7 @@ SYSCTL_UINT(_hw_if_ntb, OID_AUTO, debug_level, CTLFLAG_RWTUN,
} \
} while (0)
static unsigned transport_mtu = 0x10000 + ETHER_HDR_LEN + ETHER_CRC_LEN;
static unsigned transport_mtu = IP_MAXPACKET + ETHER_HDR_LEN + ETHER_CRC_LEN;
static uint64_t max_mw_size;
SYSCTL_UQUAD(_hw_if_ntb, OID_AUTO, max_mw_size, CTLFLAG_RDTUN, &max_mw_size, 0,
@ -435,6 +438,8 @@ ntb_setup_interface(void)
ether_ifattach(ifp, net_softc.eaddr);
ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_JUMBO_MTU;
ifp->if_capenable = ifp->if_capabilities;
ifp->if_mtu = ntb_transport_max_size(net_softc.qp) - ETHER_HDR_LEN -
ETHER_CRC_LEN;
ntb_transport_link_up(net_softc.qp);
net_softc.bufsize = ntb_transport_max_size(net_softc.qp) +