etraxfs-dma: Model metadata and eop

- Send EOP flags to the out channels.
- Send data descriptor metadata to the out channels.

Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

hw/etraxfs_dma.c

@@ -401,15 +401,29 @@ static int channel_out_run(struct fs_dma_ctrl *ctrl, int c)
 	uint32_t saved_data_buf;
 	unsigned char buf[2 * 1024];
 
+	struct dma_context_metadata meta;
+	bool send_context = true;
+
 	if (ctrl->channels[c].eol)
 		return 0;
 
 	do {
+		bool out_eop;
 		D(printf("ch=%d buf=%x after=%x\n",
 			 c,
 			 (uint32_t)ctrl->channels[c].current_d.buf,
 			 (uint32_t)ctrl->channels[c].current_d.after));
 
+		if (send_context) {
+			if (ctrl->channels[c].client->client.metadata_push) {
+				meta.metadata = ctrl->channels[c].current_d.md;
+				ctrl->channels[c].client->client.metadata_push(
+					ctrl->channels[c].client->client.opaque,
+					&meta);
+			}
+			send_context = false;
+		}
+
 		channel_load_d(ctrl, c);
 		saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
 		len = (uint32_t)(unsigned long)
@@ -420,13 +434,17 @@ static int channel_out_run(struct fs_dma_ctrl *ctrl, int c)
 			len = sizeof buf;
 		cpu_physical_memory_read (saved_data_buf, buf, len);
 
-		D(printf("channel %d pushes %x %u bytes\n", c, 
+		out_eop = ((saved_data_buf + len) ==
-			 saved_data_buf, len));
+		           ctrl->channels[c].current_d.after) &&
+			ctrl->channels[c].current_d.out_eop;
+
+		D(printf("channel %d pushes %x %u bytes eop=%u\n", c,
+		         saved_data_buf, len, out_eop));
 
 		if (ctrl->channels[c].client->client.push)
 			ctrl->channels[c].client->client.push(
 				ctrl->channels[c].client->client.opaque,
-				buf, len);
+				buf, len, out_eop);
 		else
 			printf("WARNING: DMA ch%d dataloss,"
 			       " no attached client.\n", c);
@@ -437,11 +455,9 @@ static int channel_out_run(struct fs_dma_ctrl *ctrl, int c)
 				ctrl->channels[c].current_d.after) {
 			/* Done. Step to next.  */
 			if (ctrl->channels[c].current_d.out_eop) {
-				/* TODO: signal eop to the client.  */
+				send_context = true;
-				D(printf("signal eop\n"));
 			}
 			if (ctrl->channels[c].current_d.intr) {
-				/* TODO: signal eop to the client.  */
 				/* data intr.  */
 				D(printf("signal intr %d eol=%d\n",
 					len, ctrl->channels[c].current_d.eol));

hw/etraxfs_dma.h

@@ -1,3 +1,8 @@
+struct dma_context_metadata {
+	/* data descriptor md */
+	uint16_t metadata;
+};
+
 struct etraxfs_dma_client
 {
 	/* DMA controller. */
@@ -5,10 +10,12 @@ struct etraxfs_dma_client
 	void *ctrl;
 
 	/* client.  */
-	struct
+	struct {
-	{
+		int (*push)(void *opaque, unsigned char *buf,
-		int (*push)(void *opaque, unsigned char *buf, int len);
+		            int len, bool eop);
 		void (*pull)(void *opaque);
+		void (*metadata_push)(void *opaque,
+		                      const struct dma_context_metadata *md);
 		void *opaque;
 	} client;
 };

hw/etraxfs_eth.c

@@ -540,7 +540,7 @@ static ssize_t eth_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
         return size;
 }
 
-static int eth_tx_push(void *opaque, unsigned char *buf, int len)
+static int eth_tx_push(void *opaque, unsigned char *buf, int len, bool eop)
 {
 	struct fs_eth *eth = opaque;