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task #7013: Added option LWIP_NETIF_TX_SINGLE_PBUF to try to create transmit packets from only one pbuf to help MACs that don't support scatter-gather DMA.

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This commit is contained in:
goldsimon
2009-05-10 17:07:25 +00:00
parent 105d72a3c2
commit 22d6558f13
6 changed files with 110 additions and 8 deletions
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20
src/api/sockets.c
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@@ -668,7 +668,7 @@ lwip_sendto(int s, const void *data, size_t size, int flags,
{
struct lwip_socket *sock;
struct ip_addr remote_addr;
int err;
err_t err;
u16_t short_size;
#if !LWIP_TCPIP_CORE_LOCKING
struct netbuf buf;
@@ -738,17 +738,25 @@ lwip_sendto(int s, const void *data, size_t size, int flags,
s, data, short_size, flags));
ip_addr_debug_print(SOCKETS_DEBUG, &remote_addr);
LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", remote_port));
/* make the buffer point to the data that should be sent */
if ((err = netbuf_ref(&buf, data, short_size)) == ERR_OK) {
#if LWIP_NETIF_TX_SINGLE_PBUF
/* Allocate a new netbuf and copy the data into it. */
if (netbuf_alloc(&buf, short_size) == NULL) {
err = ERR_MEM;
} else {
err = netbuf_take(&buf, data, short_size);
}
#else /* LWIP_NETIF_TX_SINGLE_PBUF */
err = netbuf_ref(&buf, data, short_size);
#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
if (err == ERR_OK) {
/* send the data */
err = netconn_send(sock->conn, &buf);
}
/* deallocated the buffer */
if (buf.p != NULL) {
pbuf_free(buf.p);
}
netbuf_free(&buf);
#endif /* LWIP_TCPIP_CORE_LOCKING */
sock_set_errno(sock, err_to_errno(err));
return (err == ERR_OK ? short_size : -1);