Hi simon:
I use following code to send file to server by FlashFxp
static err_t ftpd_datarecv(void *arg, struct tcp_pcb *pcb, struct pbuf *p,
err_t err)
{
struct ftpd_datastate *fsd = arg;
if (err == ERR_OK && p != NULL)
{
struct pbuf *q;
u16_t tot_len = 0;
for (q = p; q != NULL; q = q->next)
{
UINT len;
f_write(fsd->fil, q->payload, q->len, &len);
tot_len += len;
if (len != q->len)
break;
}
tcp_recved(pcb, tot_len);
pbuf_free(p);
ftpdatarecv_flag = 1;
}
if (err == ERR_OK && p == NULL)
{
struct ftpd_msgstate *fsm;
struct tcp_pcb *msgpcb;
fsm = fsd->msgfs;
msgpcb = fsd->msgpcb;
f_close(fsd->fil);
fsd->fil = NULL;
ftpd_dataclose(pcb, fsd);
fsm->datapcb = NULL;
fsm->datafs = NULL;
fsm->state = FTPD_IDLE;
send_msg(msgpcb, fsm, msg226);
ftpdatarecv_flag = 0;
}
return ERR_OK;
}
After send a while , the tcp_recv(pcb, ftpd_datarecv); is trigged slowed, so
the speed is down …. It seems LWIP1.3.2 bug .
Vincent Cui
Software Engineer Leader
Mobile: +8613255150315
Tel: +86 21 34612525x6104
Fax: +86 21 34619770
E-Mail: [email protected]<mailto:[email protected]>
Shanghai EnLogic Electric Technology Co., Ltd.
Address: 1104-1106, Building A, No.391, Guiping Road, Xuhui District, Shanghai,
200233
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: 2012年4月13日 2:05
To: Mailing list for lwIP users
Subject: Re: [lwip-users] tcp_sndbuf return 0 when sending file
vincent cui wrote:
All
I develop a FTP server with lwIP 1.3.2 in Cortex M3 platform, when I use
FlashFXP to get file from the server, the tcp_sndbuf always return 0 after work
a while .
I capture it with wireshark, the file is attached file. The server ip:
192.168.1.51. it seems that transfer error and need retransmission.
From the wireshark capture, I cannot see why the segment is retransmitted.
Also, at which point do you get tcp_sndbuf==0, and what's the size of
tcp_sndbuf initially?
I'm afraid that doesn't really help on your problem, though :-(
If I were you, I'd first have a look at lwip_stats to see if there are dropped
segments or memory (allocation) failures and then monitor the value of
tcp_sndbuf() (maybe it keeps getting smaller and never grows again?).
My sendcode in server is below:
[..]
err = tcp_write(pcb, fsd->fifo.buffer + i, (u16_t)(fsd->fifo.size -
i), 1);
Yikes! Using numbers instead of constants is really a thing people should learn
(I'm speaking of TCP_WRITE_FLAG_COPY vs. '1')!
We provide the constants for people to use them so we are free to modify what
they are defined to. By using '1' instead of TCP_WRITE_FLAG_COPY, you have
successfully made your code susceptible to problems with future versions of
lwIP (once we decide to change the value of TCP_WRITE_FLAG_COPY) :-)
Simon
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