qcacmn: TSO fixes

1. Unmap tso common segment only after receiving
   completions for all the tso segments for a given
   skb.
2. Keep a track of num of free tso descriptors available
   in the pool of tso descriptors.

Change-Id: I01bdbb9e40b7259f77dbcfeec22c6d8cd0c0a6dd
CRs-Fixed: 2042950

qdf/inc/qdf_nbuf.h

@@ -103,9 +103,11 @@
 
 /* Enable flag to print TSO specific prints in datapath */
 #ifdef TSO_DEBUG_LOG_ENABLE
-#define TSO_DEBUG(args ...) printk(args)
+#define TSO_DEBUG(fmt, args ...) \
+	QDF_TRACE(QDF_MODULE_ID_DP, QDF_TRACE_LEVEL_NONE, \
+		fmt, ## args)
 #else
-#define TSO_DEBUG(args ...)
+#define TSO_DEBUG(fmt, args ...)
 #endif
 
 /**

qdf/inc/qdf_trace.h

@@ -467,6 +467,14 @@ void __printf(3, 4) qdf_snprintf(char *str_buffer, unsigned int size,
 
 #define QDF_SNPRINTF qdf_snprintf
 
+#else
+
+#define DPTRACE(x)
+#define qdf_trace_hex_dump(x, y, z, q)
+
+#endif /* CONFIG_MCL */
+
+
 #ifdef TSOSEG_DEBUG
 static inline
 int qdf_tso_seg_dbg_record(struct qdf_tso_seg_elem_t *tsoseg,
@@ -522,12 +530,6 @@ qdf_tso_seg_dbg_zero(struct qdf_tso_seg_elem_t *tsoseg)
 };
 
 #endif /* TSOSEG_DEBUG */
-#else
-
-#define DPTRACE(x)
-#define qdf_trace_hex_dump(x, y, z, q)
-
-#endif /* CONFIG_MCL */
 
 #define ERROR_CODE                      -1
 #define QDF_MAX_NAME_SIZE               32

qdf/linux/src/qdf_nbuf.c

@@ -1740,7 +1740,6 @@ static uint8_t __qdf_nbuf_get_tso_cmn_seg_info(qdf_device_t osdev,
 			 tso_info->ethproto);
 		return 1;
 	}
-
 	tso_info->l2_len = (skb_network_header(skb) - skb_mac_header(skb));
 	tso_info->tcphdr = tcp_hdr(skb);
 	tso_info->tcp_seq_num = ntohl(tcp_hdr(skb)->seq);
@@ -1886,6 +1885,7 @@ uint32_t __qdf_nbuf_get_tso_info(qdf_device_t osdev, struct sk_buff *skb,
 		qdf_print("TSO: error getting common segment info\n");
 		return 0;
 	}
+
 	total_num_seg = tso_info->tso_num_seg_list;
 	curr_seg = tso_info->tso_seg_list;
 
@@ -1921,6 +1921,7 @@ uint32_t __qdf_nbuf_get_tso_info(qdf_device_t osdev, struct sk_buff *skb,
 		int i = 1; /* tso fragment index */
 		uint8_t more_tso_frags = 1;
 
+		curr_seg->seg.num_frags = 0;
 		tso_info->num_segs++;
 		total_num_seg->num_seg.tso_cmn_num_seg++;
 
@@ -1943,6 +1944,7 @@ uint32_t __qdf_nbuf_get_tso_info(qdf_device_t osdev, struct sk_buff *skb,
 			skb_proc = skb_proc - tso_frag_len;
 
 			/* increment the TCP sequence number */
+
 			tso_cmn_info.tcp_seq_num += tso_frag_len;
 			curr_seg->seg.tso_frags[i].paddr = tso_frag_paddr;
 			TSO_DEBUG("%s[%d] frag %d frag len %d total_len %u vaddr %p\n",
@@ -1997,6 +1999,12 @@ uint32_t __qdf_nbuf_get_tso_info(qdf_device_t osdev, struct sk_buff *skb,
 				__func__, __LINE__, skb_frag_len, tso_frag_len,
 				tso_seg_size);
 
+			if (!(tso_frag_vaddr)) {
+				TSO_DEBUG("%s: Fragment virtual addr is NULL",
+						__func__);
+				return 0;
+			}
+
 			tso_frag_paddr =
 					 dma_map_single(osdev->dev,
 						 tso_frag_vaddr,
@@ -2009,6 +2017,8 @@ uint32_t __qdf_nbuf_get_tso_info(qdf_device_t osdev, struct sk_buff *skb,
 				return 0;
 			}
 		}
+		TSO_DEBUG("%s tcp_seq_num: %u", __func__,
+				curr_seg->seg.tso_flags.tcp_seq_num);
 		num_seg--;
 		/* if TCP FIN flag was set, set it in the last segment */
 		if (!num_seg)