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unix/dgram: bump maximum datagram size limit to 8k

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This is important for wpa_supplicant operation on a crowded network.

Note: we actually need an API to increase maximum datagram size on a
socket.  Previously SO_SNDBUF magically acted like that, but that was
an undocumented "feature".

Also move the comment to the proper line.  Previously it was the receive
buffer that imposed the limit.  Now notion of buffer size and maximum
datagram are separate.

Reviewed by:		bz, tuexen, karels
Differential Revision:	https://reviews.freebsd.org/D42830
PR:			274990
This commit is contained in:
Gleb Smirnoff 2023-12-01 15:37:29 -08:00
parent 9fb914634e
commit be7c095ac9
1 changed files with 2 additions and 2 deletions
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4
sys/kern/uipc_usrreq.c
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@ -154,8 +154,8 @@ static struct task unp_defer_task;
#endif
static u_long unpst_sendspace = PIPSIZ;
static u_long unpst_recvspace = PIPSIZ;
static u_long unpdg_maxdgram = 2*1024;
static u_long unpdg_recvspace = 16*1024; /* support 8KB syslog msgs */
static u_long unpdg_maxdgram = 8*1024; /* support 8KB syslog msgs */
static u_long unpdg_recvspace = 16*1024;
static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */
static u_long unpsp_recvspace = PIPSIZ;