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net: systemport: pad packets to a minimum of 68 bytes

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Packets need to be at least 64 bytes to enter the switch port logic,
including the FCS, otherwise they will be discarded as RUNT packets.

With packets having Broadcom tags, the 4-bytes tag is first stripped
off the packet, and the packet length is then checked, so we need to
make sure that the packet length with FCS is at least 64 bytes.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli
2014-05-14 19:32:14 -07:00
committed by David S. Miller
parent d5e32cc7c9
commit dab531b430
2 changed files with 23 additions and 7 deletions
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6
drivers/net/ethernet/broadcom/bcmsysport.h
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@@ -29,11 +29,11 @@
/* Default RX buffer allocation size */
#define RX_BUF_LENGTH 2048
/* Body(1500) + EH_SIZE(14) + VLANTAG(4) + BRCMTAG(6) + FCS(4) = 1528.
/* Body(1500) + EH_SIZE(14) + VLANTAG(4) + BRCMTAG(4) + FCS(4) = 1526.
* 1536 is multiple of 256 bytes
*/
#define ENET_BRCM_TAG_LEN 6
#define ENET_PAD 8
#define ENET_BRCM_TAG_LEN 4
#define ENET_PAD 10
#define UMAC_MAX_MTU_SIZE (ETH_DATA_LEN + ETH_HLEN + VLAN_HLEN + \
ENET_BRCM_TAG_LEN + ETH_FCS_LEN + ENET_PAD)