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net: increase maximum frame size to accomediate VLAN packets 

Ethernet packages with IEEE 802.1Q VLAN support may be up to 1522
bytes long. Increase the default size used to allocate packet
storage by 4 bytes. While at it, let git care about history and
rewrite the comment to represent the situation today only.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Stefan Agner 2016-04-13 16:38:02 -07:00 committed by Joe Hershberger
parent 0299cee530
commit 700877a62b
1 changed files with 5 additions and 11 deletions
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16
include/net.h
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@ -465,20 +465,14 @@ struct icmp_hdr {
#define IP_ICMP_HDR_SIZE (IP_HDR_SIZE + ICMP_HDR_SIZE) #define IP_ICMP_HDR_SIZE (IP_HDR_SIZE + ICMP_HDR_SIZE)
/* /*
* Maximum packet size; used to allocate packet storage. * Maximum packet size; used to allocate packet storage. Use
* TFTP packets can be 524 bytes + IP header + ethernet header. * the maxium Ethernet frame size as specified by the Ethernet
* Lets be conservative, and go for 38 * 16. (Must also be * standard including the 802.1Q tag (VLAN tagging).
* a multiple of 32 bytes). * maximum packet size = 1522
*/
/*
* AS.HARNOIS : Better to set PKTSIZE to maximum size because
* traffic type is not always controlled
* maximum packet size = 1518
* maximum packet size and multiple of 32 bytes = 1536 * maximum packet size and multiple of 32 bytes = 1536
*/ */
#define PKTSIZE 1518 #define PKTSIZE 1522
#define PKTSIZE_ALIGN 1536 #define PKTSIZE_ALIGN 1536
/*#define PKTSIZE 608*/
/* /*
* Maximum receive ring size; that is, the number of packets * Maximum receive ring size; that is, the number of packets