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Commit 0ab1c252 authored by Mike Christie's avatar Mike Christie Committed by James Bottomley
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[SCSI] libiscsi_tcp: replace tcp_debug/scsi_debug logging with session/conn logging 



This makes the logging a compile time option and replaces
the scsi_debug and tcp_debug macro with session and connection ones
that print out a driver model id prefix.

Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent 1b2c7af8

drivers/scsi/libiscsi_tcp.c

+62 −60
Original line number Diff line number Diff line
@@ -49,13 +49,21 @@ MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " 
	      "Alex Aizman <itn780@yahoo.com>");

MODULE_DESCRIPTION("iSCSI/TCP data-path");

MODULE_LICENSE("GPL");

#undef DEBUG_TCP



#ifdef DEBUG_TCP

#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)

#else

#define debug_tcp(fmt...)

#endif

static int iscsi_dbg_libtcp;

module_param_named(debug_libiscsi_tcp, iscsi_dbg_libtcp, int,

		   S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(debug_libiscsi_tcp, "Turn on debugging for libiscsi_tcp "

		 "module. Set to 1 to turn on, and zero to turn off. Default "

		 "is off.");



#define ISCSI_DBG_TCP(_conn, dbg_fmt, arg...)			\

	do {							\

		if (iscsi_dbg_libtcp)				\

			iscsi_conn_printk(KERN_INFO, _conn,	\

					     "%s " dbg_fmt,	\

					     __func__, ##arg);	\

	} while (0);



static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,

				   struct iscsi_segment *segment);
@@ -123,18 +131,13 @@ static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) 
	if (page_count(sg_page(sg)) >= 1 && !recv)

		return;



	debug_tcp("iscsi_tcp_segment_map %s %p\n", recv ? "recv" : "xmit",

		  segment);

	segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0);

	segment->data = segment->sg_mapped + sg->offset + segment->sg_offset;

}



void iscsi_tcp_segment_unmap(struct iscsi_segment *segment)

{

	debug_tcp("iscsi_tcp_segment_unmap %p\n", segment);



	if (segment->sg_mapped) {

		debug_tcp("iscsi_tcp_segment_unmap valid\n");

		kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0);

		segment->sg_mapped = NULL;

		segment->data = NULL;
@@ -180,8 +183,9 @@ int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, 
	struct scatterlist sg;

	unsigned int pad;



	debug_tcp("copied %u %u size %u %s\n", segment->copied, copied,

		  segment->size, recv ? "recv" : "xmit");

	ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copied %u %u size %u %s\n",

		      segment->copied, copied, segment->size,

		      recv ? "recv" : "xmit");

	if (segment->hash && copied) {

		/*

		 * If a segment is kmapd we must unmap it before sending
@@ -214,8 +218,8 @@ int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, 
	iscsi_tcp_segment_unmap(segment);



	/* Do we have more scatterlist entries? */

	debug_tcp("total copied %u total size %u\n", segment->total_copied,

		   segment->total_size);

	ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "total copied %u total size %u\n",

		      segment->total_copied, segment->total_size);

	if (segment->total_copied < segment->total_size) {

		/* Proceed to the next entry in the scatterlist. */

		iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg),
@@ -229,7 +233,8 @@ int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, 
	if (!(tcp_conn->iscsi_conn->session->tt->caps & CAP_PADDING_OFFLOAD)) {

		pad = iscsi_padding(segment->total_copied);

		if (pad != 0) {

			debug_tcp("consume %d pad bytes\n", pad);

			ISCSI_DBG_TCP(tcp_conn->iscsi_conn,

				      "consume %d pad bytes\n", pad);

			segment->total_size += pad;

			segment->size = pad;

			segment->data = segment->padbuf;
@@ -278,13 +283,13 @@ iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, 


	while (!iscsi_tcp_segment_done(tcp_conn, segment, 1, copy)) {

		if (copied == len) {

			debug_tcp("iscsi_tcp_segment_recv copied %d bytes\n",

				  len);

			ISCSI_DBG_TCP(tcp_conn->iscsi_conn,

				      "copied %d bytes\n", len);

			break;

		}



		copy = min(len - copied, segment->size - segment->copied);

		debug_tcp("iscsi_tcp_segment_recv copying %d\n", copy);

		ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copying %d\n", copy);

		memcpy(segment->data + segment->copied, ptr + copied, copy);

		copied += copy;

	}
@@ -311,7 +316,7 @@ iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, 


	if (memcmp(segment->recv_digest, segment->digest,

		   segment->digest_len)) {

		debug_scsi("digest mismatch\n");

		ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "digest mismatch\n");

		return 0;

	}
@@ -355,12 +360,8 @@ iscsi_segment_seek_sg(struct iscsi_segment *segment, 
	struct scatterlist *sg;

	unsigned int i;



	debug_scsi("iscsi_segment_seek_sg offset %u size %llu\n",

		  offset, size);

	__iscsi_segment_init(segment, size, done, hash);

	for_each_sg(sg_list, sg, sg_count, i) {

		debug_scsi("sg %d, len %u offset %u\n", i, sg->length,

			   sg->offset);

		if (offset < sg->length) {

			iscsi_tcp_segment_init_sg(segment, sg, offset);

			return 0;
@@ -382,8 +383,9 @@ EXPORT_SYMBOL_GPL(iscsi_segment_seek_sg); 
 */

void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn)

{

	debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn,

		  tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : "");

	ISCSI_DBG_TCP(tcp_conn->iscsi_conn,

		      "(%s)\n", tcp_conn->iscsi_conn->hdrdgst_en ?

		      "digest enabled" : "digest disabled");

	iscsi_segment_init_linear(&tcp_conn->in.segment,

				tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr),

				iscsi_tcp_hdr_recv_done, NULL);
@@ -446,7 +448,7 @@ void iscsi_tcp_cleanup_task(struct iscsi_task *task) 
	while (__kfifo_get(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) {

		__kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,

			    sizeof(void*));

		debug_scsi("iscsi_tcp_cleanup_task pending r2t dropped\n");

		ISCSI_DBG_TCP(task->conn, "pending r2t dropped\n");

	}



	r2t = tcp_task->r2t;
@@ -476,8 +478,8 @@ static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task) 
		return 0;



	if (tcp_task->exp_datasn != datasn) {

		debug_tcp("%s: task->exp_datasn(%d) != rhdr->datasn(%d)\n",

		          __func__, tcp_task->exp_datasn, datasn);

		ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->datasn(%d)"

			      "\n", tcp_task->exp_datasn, datasn);

		return ISCSI_ERR_DATASN;

	}
@@ -485,8 +487,8 @@ static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task) 


	tcp_task->data_offset = be32_to_cpu(rhdr->offset);

	if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) {

		debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",

		          __func__, tcp_task->data_offset,

		ISCSI_DBG_TCP(conn, "data_offset(%d) + data_len(%d) > "

			      "total_length_in(%d)\n", tcp_task->data_offset,

			      tcp_conn->in.datalen, total_in_length);

		return ISCSI_ERR_DATA_OFFSET;

	}
@@ -518,8 +520,8 @@ static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task) 
	}



	if (tcp_task->exp_datasn != r2tsn){

		debug_tcp("%s: task->exp_datasn(%d) != rhdr->r2tsn(%d)\n",

		          __func__, tcp_task->exp_datasn, r2tsn);

		ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->r2tsn(%d)\n",

			      tcp_task->exp_datasn, r2tsn);

		return ISCSI_ERR_R2TSN;

	}
@@ -552,8 +554,8 @@ static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task) 
	}



	if (r2t->data_length > session->max_burst)

		debug_scsi("invalid R2T with data len %u and max burst %u."

			   "Attempting to execute request.\n",

		ISCSI_DBG_TCP(conn, "invalid R2T with data len %u and max "

			      "burst %u. Attempting to execute request.\n",

			      r2t->data_length, session->max_burst);



	r2t->data_offset = be32_to_cpu(rhdr->data_offset);
@@ -641,7 +643,7 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 
	if (rc)

		return rc;



	debug_tcp("opcode 0x%x ahslen %d datalen %d\n",

	ISCSI_DBG_TCP(conn, "opcode 0x%x ahslen %d datalen %d\n",

		      opcode, ahslen, tcp_conn->in.datalen);



	switch(opcode) {
@@ -674,8 +676,8 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 
			    !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))

				rx_hash = tcp_conn->rx_hash;



			debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, "

				  "datalen=%d)\n", tcp_conn,

			ISCSI_DBG_TCP(conn, "iscsi_tcp_begin_data_in( "

				     "offset=%d, datalen=%d)\n",

				      tcp_task->data_offset,

				      tcp_conn->in.datalen);

			rc = iscsi_segment_seek_sg(&tcp_conn->in.segment,
@@ -854,10 +856,10 @@ int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, 
	unsigned int consumed = 0;

	int rc = 0;



	debug_tcp("in %d bytes\n", skb->len - offset);

	ISCSI_DBG_TCP(conn, "in %d bytes\n", skb->len - offset);



	if (unlikely(conn->suspend_rx)) {

		debug_tcp("conn %d Rx suspended!\n", conn->id);

		ISCSI_DBG_TCP(conn, "Rx suspended!\n");

		*status = ISCSI_TCP_SUSPENDED;

		return 0;

	}
@@ -874,7 +876,7 @@ int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, 


		avail = skb_seq_read(consumed, &ptr, &seq);

		if (avail == 0) {

			debug_tcp("no more data avail. Consumed %d\n",

			ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n",

				      consumed);

			*status = ISCSI_TCP_SKB_DONE;

			skb_abort_seq_read(&seq);
@@ -882,7 +884,8 @@ int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, 
		}

		BUG_ON(segment->copied >= segment->size);



		debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail);

		ISCSI_DBG_TCP(conn, "skb %p ptr=%p avail=%u\n", skb, ptr,

			      avail);

		rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail);

		BUG_ON(rc == 0);

		consumed += rc;
@@ -895,11 +898,11 @@ int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, 


segment_done:

	*status = ISCSI_TCP_SEGMENT_DONE;

	debug_tcp("segment done\n");

	ISCSI_DBG_TCP(conn, "segment done\n");

	rc = segment->done(tcp_conn, segment);

	if (rc != 0) {

		*status = ISCSI_TCP_CONN_ERR;

		debug_tcp("Error receiving PDU, errno=%d\n", rc);

		ISCSI_DBG_TCP(conn, "Error receiving PDU, errno=%d\n", rc);

		iscsi_conn_failure(conn, rc);

		return 0;

	}
@@ -929,8 +932,7 @@ int iscsi_tcp_task_init(struct iscsi_task *task) 
		 * mgmt tasks do not have a scatterlist since they come

		 * in from the iscsi interface.

		 */

		debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id,

			   task->itt);

		ISCSI_DBG_TCP(conn, "mtask deq [itt 0x%x]\n", task->itt);



		return conn->session->tt->init_pdu(task, 0, task->data_count);

	}
@@ -939,9 +941,8 @@ int iscsi_tcp_task_init(struct iscsi_task *task) 
	tcp_task->exp_datasn = 0;



	/* Prepare PDU, optionally w/ immediate data */

	debug_scsi("task deq [cid %d itt 0x%x imm %d unsol %d]\n",

		    conn->id, task->itt, task->imm_count,

		    task->unsol_r2t.data_length);

	ISCSI_DBG_TCP(conn, "task deq [itt 0x%x imm %d unsol %d]\n",

		      task->itt, task->imm_count, task->unsol_r2t.data_length);



	err = conn->session->tt->init_pdu(task, 0, task->imm_count);

	if (err)
@@ -965,7 +966,8 @@ static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task) 
			r2t = tcp_task->r2t;

			/* Continue with this R2T? */

			if (r2t->data_length <= r2t->sent) {

				debug_scsi("  done with r2t %p\n", r2t);

				ISCSI_DBG_TCP(task->conn,

					      "  done with r2t %p\n", r2t);

				__kfifo_put(tcp_task->r2tpool.queue,

					    (void *)&tcp_task->r2t,

					    sizeof(void *));
@@ -1019,7 +1021,7 @@ flush: 
	r2t = iscsi_tcp_get_curr_r2t(task);

	if (r2t == NULL) {

		/* Waiting for more R2Ts to arrive. */

		debug_tcp("no R2Ts yet\n");

		ISCSI_DBG_TCP(conn, "no R2Ts yet\n");

		return 0;

	}
@@ -1028,7 +1030,7 @@ flush: 
		return rc;

	iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr);



	debug_scsi("sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",

	ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",

		      r2t, r2t->datasn - 1, task->hdr->itt,

		      r2t->data_offset + r2t->sent, r2t->data_count);