1 files changed, 62 insertions, 60 deletions

diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c
index e7705d3532c9..91f8ce4d8d08 100644
--- a/drivers/scsi/libiscsi_tcp.c
+++ b/drivers/scsi/libiscsi_tcp.c
@@ -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;
         }
 
@@ -485,9 +487,9 @@ 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,
-                          tcp_conn->in.datalen, total_in_length);
+                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;
         }
 
@@ -552,9 +554,9 @@ 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",
-                            r2t->data_length, session->max_burst);
+                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);
         if (r2t->data_offset + r2t->data_length > scsi_out(task->sc)->length) {
@@ -641,8 +643,8 @@ 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",
-                  opcode, ahslen, tcp_conn->in.datalen);
+        ISCSI_DBG_TCP(conn, "opcode 0x%x ahslen %d datalen %d\n",
+                      opcode, ahslen, tcp_conn->in.datalen);
 
         switch(opcode) {
         case ISCSI_OP_SCSI_DATA_IN:
@@ -674,10 +676,10 @@ 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,
-                                  tcp_task->data_offset,
-                                  tcp_conn->in.datalen);
+                        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,
                                                    sdb->table.sgl,
                                                    sdb->table.nents,
@@ -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;
         }
@@ -874,15 +876,16 @@ 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",
-                                  consumed);
+                        ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n",
+                                      consumed);
                         *status = ISCSI_TCP_SKB_DONE;
                         skb_abort_seq_read(&seq);
                         goto skb_done;
                 }
                 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;
         }
 
@@ -1028,9 +1030,9 @@ 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",
-                   r2t, r2t->datasn - 1, task->hdr->itt,
-                   r2t->data_offset + r2t->sent, r2t->data_count);
+        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);
 
         rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent,
                                          r2t->data_count);