diff options
| author | Joe Hershberger <joe.hershberger@ni.com> | 2018-09-26 16:49:02 -0500 |
|---|---|---|
| committer | Joe Hershberger <joe.hershberger@ni.com> | 2018-10-10 12:29:01 -0500 |
| commit | ac3f26cc15ad7e3e9efc2b0b0e18c6e84d93af77 (patch) | |
| tree | 1bc636d01766693ddfceda55311ee2f72908a1f8 /include | |
| parent | 72ff0042585bedab4364afbd7ecc935e48324ade (diff) | |
net: Don't overwrite waiting packets with asynchronous replies
Peter originally sent a fix, but it breaks a number of other things.
This addresses the original reported issue in a different way.
That report was:
> U-Boot has 1 common buffer to send Ethernet frames, pointed to by
> net_tx_packet. When sending to an IP address without knowing the MAC
> address, U-Boot makes an ARP request (using the arp_tx_packet buffer)
> to find out the MAC address of the IP addressr. When a matching ARP
> reply is received, U-Boot continues sending the frame stored in the
> net_tx_packet buffer.
>
> However, in the mean time, if U-Boot needs to send out any network
> packets (e.g. replying ping packets or ARP requests for its own IP
> address etc.), it will use the net_tx_packet buffer to prepare the
> new packet. Thus this buffer is no longer the original packet meant
> to be transmitted after the ARP reply. The original packet will be
> lost.
This instead uses the ARP tx buffer to send async replies in the case
where we are actively waiting for an ARP reply.
Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reported-by: Tran Tien Dat <peter.trantiendat@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net.h b/include/net.h index 40e895316e..e5cd52b726 100644 --- a/include/net.h +++ b/include/net.h @@ -655,6 +655,14 @@ static inline void net_set_state(enum net_loop_state state) net_state = state; } +/* + * net_get_async_tx_pkt_buf - Get a packet buffer that is not in use for + * sending an asynchronous reply + * + * returns - ptr to packet buffer + */ +uchar * net_get_async_tx_pkt_buf(void); + /* Transmit a packet */ static inline void net_send_packet(uchar *pkt, int len) { |