cxgb4: Add support for Inline IPSec Tx

Added Tx routine for ULD
- define interface for ULD Tx.

Export routines used for Tx data
- Routines common for data transmit are used by cxgb4 and chcr
  drivers.
- EXPORT routines enable transmit from chcr driver.

Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/net/ethernet/chelsio/cxgb4/cxgb4.h

@@ -58,6 +58,13 @@
 extern struct list_head adapter_list;
 extern struct mutex uld_mutex;
 
+/* Suspend an Ethernet Tx queue with fewer available descriptors than this.
+ * This is the same as calc_tx_descs() for a TSO packet with
+ * nr_frags == MAX_SKB_FRAGS.
+ */
+#define ETHTXQ_STOP_THRES \
+	(1 + DIV_ROUND_UP((3 * MAX_SKB_FRAGS) / 2 + (MAX_SKB_FRAGS & 1), 8))
+
 enum {
 	MAX_NPORTS	= 4,     /* max # of ports */
 	SERNUM_LEN	= 24,    /* Serial # length */
@@ -564,6 +571,7 @@ enum {                                 /* adapter flags */
 
 enum {
 	ULP_CRYPTO_LOOKASIDE = 1 << 0,
+	ULP_CRYPTO_IPSEC_INLINE = 1 << 1,
 };
 
 struct rx_sw_desc;
@@ -968,6 +976,11 @@ enum {
 	SCHED_CLASS_RATEMODE_ABS = 1,   /* Kb/s */
 };
 
+struct tx_sw_desc {                /* SW state per Tx descriptor */
+	struct sk_buff *skb;
+	struct ulptx_sgl *sgl;
+};
+
 /* Support for "sched_queue" command to allow one or more NIC TX Queues
  * to be bound to a TX Scheduling Class.
  */
@@ -1700,4 +1713,14 @@ void free_rspq_fl(struct adapter *adap, struct sge_rspq *rq, struct sge_fl *fl);
 void free_tx_desc(struct adapter *adap, struct sge_txq *q,
 		  unsigned int n, bool unmap);
 void free_txq(struct adapter *adap, struct sge_txq *q);
+void cxgb4_reclaim_completed_tx(struct adapter *adap,
+				struct sge_txq *q, bool unmap);
+int cxgb4_map_skb(struct device *dev, const struct sk_buff *skb,
+		  dma_addr_t *addr);
+void cxgb4_inline_tx_skb(const struct sk_buff *skb, const struct sge_txq *q,
+			 void *pos);
+void cxgb4_write_sgl(const struct sk_buff *skb, struct sge_txq *q,
+		     struct ulptx_sgl *sgl, u64 *end, unsigned int start,
+		     const dma_addr_t *addr);
+void cxgb4_ring_tx_db(struct adapter *adap, struct sge_txq *q, int n);
 #endif /* __CXGB4_H__ */

drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c

@@ -3096,6 +3096,8 @@ static int chcr_show(struct seq_file *seq, void *v)
 		   atomic_read(&adap->chcr_stats.error));
 	seq_printf(seq, "Fallback: %10u \n",
 		   atomic_read(&adap->chcr_stats.fallback));
+	seq_printf(seq, "IPSec PDU: %10u\n",
+		   atomic_read(&adap->chcr_stats.ipsec_cnt));
 	return 0;
 }
 

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -4096,7 +4096,7 @@ static int adap_init0(struct adapter *adap)
 		} else {
 			adap->vres.ncrypto_fc = val[0];
 		}
-		adap->params.crypto |= ULP_CRYPTO_LOOKASIDE;
+		adap->params.crypto = ntohs(caps_cmd.cryptocaps);
 		adap->num_uld += 1;
 	}
 #undef FW_PARAM_PFVF

drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c

@@ -637,6 +637,7 @@ static void uld_init(struct adapter *adap, struct cxgb4_lld_info *lld)
 	lld->nchan = adap->params.nports;
 	lld->nports = adap->params.nports;
 	lld->wr_cred = adap->params.ofldq_wr_cred;
+	lld->crypto = adap->params.crypto;
 	lld->iscsi_iolen = MAXRXDATA_G(t4_read_reg(adap, TP_PARA_REG2_A));
 	lld->iscsi_tagmask = t4_read_reg(adap, ULP_RX_ISCSI_TAGMASK_A);
 	lld->iscsi_pgsz_order = t4_read_reg(adap, ULP_RX_ISCSI_PSZ_A);

drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h

@@ -297,6 +297,7 @@ struct chcr_stats_debug {
 	atomic_t complete;
 	atomic_t error;
 	atomic_t fallback;
+	atomic_t ipsec_cnt;
 };
 
 #define OCQ_WIN_OFFSET(pdev, vres) \
@@ -322,6 +323,7 @@ struct cxgb4_lld_info {
 	unsigned char wr_cred;               /* WR 16-byte credits */
 	unsigned char adapter_type;          /* type of adapter */
 	unsigned char fw_api_ver;            /* FW API version */
+	unsigned char crypto;                /* crypto support */
 	unsigned int fw_vers;                /* FW version */
 	unsigned int iscsi_iolen;            /* iSCSI max I/O length */
 	unsigned int cclk_ps;                /* Core clock period in psec */
@@ -370,6 +372,7 @@ struct cxgb4_uld_info {
 			      struct t4_lro_mgr *lro_mgr,
 			      struct napi_struct *napi);
 	void (*lro_flush)(struct t4_lro_mgr *);
+	int (*tx_handler)(struct sk_buff *skb, struct net_device *dev);
 };
 
 int cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p);