[dpdk-dev] [PATCH 2/2] net/sfc: advertise offload caps directly by Tx datapaths

[Andrew Rybchenko <arybchenko@solarflare.com>]

Tx datapath feature bits were useful on migration from the old offload API
to the new one. However, right now it just adds indirection which
complicates code reading and understanding. Also addition of a new
offloads requires addition of a new feature bits and makes patches longer
and harder to understand. So, remove feature bits which correspond to Tx
offloads and simply advertise device and per-queue offloads directly.
Generic code could still mask some offloads if running HW or FW does not
support it.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Igor Romanov <igor.romanov@oktetlabs.ru>
Reviewed-by: Ivan Malov <ivan.malov@oktetlabs.ru>
---
 drivers/net/sfc/sfc.c         |  7 +++--
 drivers/net/sfc/sfc_dp_tx.h   | 24 +++++++++++-----
 drivers/net/sfc/sfc_ef10_tx.c | 20 ++++++++++----
 drivers/net/sfc/sfc_tx.c      | 64 ++++++++++++++++++++-----------------------
 4 files changed, 65 insertions(+), 50 deletions(-)

diff --git a/drivers/net/sfc/sfc.c b/drivers/net/sfc/sfc.c
index 406386a..dea57b2 100644
--- a/drivers/net/sfc/sfc.c
+++ b/drivers/net/sfc/sfc.c
@@ -744,13 +744,16 @@
 	sa->priv.shared->tunnel_encaps =
 		encp->enc_tunnel_encapsulations_supported;
 
-	if (sa->priv.dp_tx->features & SFC_DP_TX_FEAT_TSO) {
+	if (sfc_dp_tx_offload_capa(sa->priv.dp_tx) & DEV_TX_OFFLOAD_TCP_TSO) {
 		sa->tso = encp->enc_fw_assisted_tso_v2_enabled;
 		if (!sa->tso)
 			sfc_info(sa, "TSO support isn't available on this adapter");
 	}
 
-	if (sa->tso && sa->priv.dp_tx->features & SFC_DP_TX_FEAT_TSO_ENCAP) {
+	if (sa->tso &&
+	    (sfc_dp_tx_offload_capa(sa->priv.dp_tx) &
+	     (DEV_TX_OFFLOAD_VXLAN_TNL_TSO |
+	      DEV_TX_OFFLOAD_GENEVE_TNL_TSO)) != 0) {
 		sa->tso_encap = encp->enc_fw_assisted_tso_v2_encap_enabled;
 		if (!sa->tso_encap)
 			sfc_info(sa, "Encapsulated TSO support isn't available on this adapter");
diff --git a/drivers/net/sfc/sfc_dp_tx.h b/drivers/net/sfc/sfc_dp_tx.h
index 72a6914..7105d27 100644
--- a/drivers/net/sfc/sfc_dp_tx.h
+++ b/drivers/net/sfc/sfc_dp_tx.h
@@ -157,13 +157,17 @@ struct sfc_dp_tx {
 	struct sfc_dp			dp;
 
 	unsigned int			features;
-#define SFC_DP_TX_FEAT_VLAN_INSERT	0x1
-#define SFC_DP_TX_FEAT_TSO		0x2
-#define SFC_DP_TX_FEAT_MULTI_SEG	0x4
-#define SFC_DP_TX_FEAT_MULTI_PROCESS	0x8
-#define SFC_DP_TX_FEAT_MULTI_POOL	0x10
-#define SFC_DP_TX_FEAT_REFCNT		0x20
-#define SFC_DP_TX_FEAT_TSO_ENCAP	0x40
+#define SFC_DP_TX_FEAT_MULTI_PROCESS	0x1
+	/**
+	 * Tx offload capabilities supported by the datapath on device
+	 * level only if HW/FW supports it.
+	 */
+	uint64_t			dev_offload_capa;
+	/**
+	 * Tx offload capabilities supported by the datapath per-queue
+	 * if HW/FW supports it.
+	 */
+	uint64_t			queue_offload_capa;
 	sfc_dp_tx_get_dev_info_t	*get_dev_info;
 	sfc_dp_tx_qsize_up_rings_t	*qsize_up_rings;
 	sfc_dp_tx_qcreate_t		*qcreate;
@@ -196,6 +200,12 @@ struct sfc_dp_tx {
 /** Get Tx datapath ops by the datapath TxQ handle */
 const struct sfc_dp_tx *sfc_dp_tx_by_dp_txq(const struct sfc_dp_txq *dp_txq);
 
+static inline uint64_t
+sfc_dp_tx_offload_capa(const struct sfc_dp_tx *dp_tx)
+{
+	return dp_tx->dev_offload_capa | dp_tx->queue_offload_capa;
+}
+
 static inline int
 sfc_dp_tx_prepare_pkt(struct rte_mbuf *m,
 			   uint32_t tso_tcp_header_offset_limit,
diff --git a/drivers/net/sfc/sfc_ef10_tx.c b/drivers/net/sfc/sfc_ef10_tx.c
index 4e4f358..43e3447 100644
--- a/drivers/net/sfc/sfc_ef10_tx.c
+++ b/drivers/net/sfc/sfc_ef10_tx.c
@@ -1098,12 +1098,15 @@ struct sfc_dp_tx sfc_ef10_tx = {
 		.type		= SFC_DP_TX,
 		.hw_fw_caps	= SFC_DP_HW_FW_CAP_EF10,
 	},
-	.features		= SFC_DP_TX_FEAT_TSO |
-				  SFC_DP_TX_FEAT_TSO_ENCAP |
-				  SFC_DP_TX_FEAT_MULTI_SEG |
-				  SFC_DP_TX_FEAT_MULTI_POOL |
-				  SFC_DP_TX_FEAT_REFCNT |
-				  SFC_DP_TX_FEAT_MULTI_PROCESS,
+	.features		= SFC_DP_TX_FEAT_MULTI_PROCESS,
+	.dev_offload_capa	= DEV_TX_OFFLOAD_MULTI_SEGS,
+	.queue_offload_capa	= DEV_TX_OFFLOAD_IPV4_CKSUM |
+				  DEV_TX_OFFLOAD_UDP_CKSUM |
+				  DEV_TX_OFFLOAD_TCP_CKSUM |
+				  DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM |
+				  DEV_TX_OFFLOAD_TCP_TSO |
+				  DEV_TX_OFFLOAD_VXLAN_TNL_TSO |
+				  DEV_TX_OFFLOAD_GENEVE_TNL_TSO,
 	.get_dev_info		= sfc_ef10_get_dev_info,
 	.qsize_up_rings		= sfc_ef10_tx_qsize_up_rings,
 	.qcreate		= sfc_ef10_tx_qcreate,
@@ -1123,6 +1126,11 @@ struct sfc_dp_tx sfc_ef10_simple_tx = {
 		.type		= SFC_DP_TX,
 	},
 	.features		= SFC_DP_TX_FEAT_MULTI_PROCESS,
+	.dev_offload_capa	= DEV_TX_OFFLOAD_MBUF_FAST_FREE,
+	.queue_offload_capa	= DEV_TX_OFFLOAD_IPV4_CKSUM |
+				  DEV_TX_OFFLOAD_UDP_CKSUM |
+				  DEV_TX_OFFLOAD_TCP_CKSUM |
+				  DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM,
 	.get_dev_info		= sfc_ef10_get_dev_info,
 	.qsize_up_rings		= sfc_ef10_tx_qsize_up_rings,
 	.qcreate		= sfc_ef10_tx_qcreate,
diff --git a/drivers/net/sfc/sfc_tx.c b/drivers/net/sfc/sfc_tx.c
index e1ef00c..7d0e18a 100644
--- a/drivers/net/sfc/sfc_tx.c
+++ b/drivers/net/sfc/sfc_tx.c
@@ -34,47 +34,38 @@
  */
 #define SFC_TX_QFLUSH_POLL_ATTEMPTS	(2000)
 
-uint64_t
-sfc_tx_get_dev_offload_caps(struct sfc_adapter *sa)
+static uint64_t
+sfc_tx_get_offload_mask(struct sfc_adapter *sa)
 {
 	const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
-	uint64_t caps = 0;
+	uint64_t no_caps = 0;
 
-	if ((sa->priv.dp_tx->features & SFC_DP_TX_FEAT_VLAN_INSERT) &&
-	    encp->enc_hw_tx_insert_vlan_enabled)
-		caps |= DEV_TX_OFFLOAD_VLAN_INSERT;
+	if (!encp->enc_hw_tx_insert_vlan_enabled)
+		no_caps |= DEV_TX_OFFLOAD_VLAN_INSERT;
 
-	if (sa->priv.dp_tx->features & SFC_DP_TX_FEAT_MULTI_SEG)
-		caps |= DEV_TX_OFFLOAD_MULTI_SEGS;
+	if (!encp->enc_tunnel_encapsulations_supported)
+		no_caps |= DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM;
 
-	if ((~sa->priv.dp_tx->features & SFC_DP_TX_FEAT_MULTI_POOL) &&
-	    (~sa->priv.dp_tx->features & SFC_DP_TX_FEAT_REFCNT))
-		caps |= DEV_TX_OFFLOAD_MBUF_FAST_FREE;
+	if (!sa->tso)
+		no_caps |= DEV_TX_OFFLOAD_TCP_TSO;
 
-	return caps;
+	if (!sa->tso_encap)
+		no_caps |= (DEV_TX_OFFLOAD_VXLAN_TNL_TSO |
+			    DEV_TX_OFFLOAD_GENEVE_TNL_TSO);
+
+	return ~no_caps;
 }
 
 uint64_t
-sfc_tx_get_queue_offload_caps(struct sfc_adapter *sa)
+sfc_tx_get_dev_offload_caps(struct sfc_adapter *sa)
 {
-	const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
-	uint64_t caps = 0;
-
-	caps |= DEV_TX_OFFLOAD_IPV4_CKSUM;
-	caps |= DEV_TX_OFFLOAD_UDP_CKSUM;
-	caps |= DEV_TX_OFFLOAD_TCP_CKSUM;
-
-	if (encp->enc_tunnel_encapsulations_supported)
-		caps |= DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM;
-
-	if (sa->tso)
-		caps |= DEV_TX_OFFLOAD_TCP_TSO;
-
-	if (sa->tso_encap)
-		caps |= (DEV_TX_OFFLOAD_VXLAN_TNL_TSO |
-			 DEV_TX_OFFLOAD_GENEVE_TNL_TSO);
+	return sa->priv.dp_tx->dev_offload_capa & sfc_tx_get_offload_mask(sa);
+}
 
-	return caps;
+uint64_t
+sfc_tx_get_queue_offload_caps(struct sfc_adapter *sa)
+{
+	return sa->priv.dp_tx->queue_offload_capa & sfc_tx_get_offload_mask(sa);
 }
 
 static int
@@ -1149,11 +1140,14 @@ struct sfc_dp_tx sfc_efx_tx = {
 		.type		= SFC_DP_TX,
 		.hw_fw_caps	= 0,
 	},
-	.features		= SFC_DP_TX_FEAT_VLAN_INSERT |
-				  SFC_DP_TX_FEAT_TSO |
-				  SFC_DP_TX_FEAT_MULTI_POOL |
-				  SFC_DP_TX_FEAT_REFCNT |
-				  SFC_DP_TX_FEAT_MULTI_SEG,
+	.features		= 0,
+	.dev_offload_capa	= DEV_TX_OFFLOAD_VLAN_INSERT |
+				  DEV_TX_OFFLOAD_MULTI_SEGS,
+	.queue_offload_capa	= DEV_TX_OFFLOAD_IPV4_CKSUM |
+				  DEV_TX_OFFLOAD_UDP_CKSUM |
+				  DEV_TX_OFFLOAD_TCP_CKSUM |
+				  DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM |
+				  DEV_TX_OFFLOAD_TCP_TSO,
 	.qsize_up_rings		= sfc_efx_tx_qsize_up_rings,
 	.qcreate		= sfc_efx_tx_qcreate,
 	.qdestroy		= sfc_efx_tx_qdestroy,
-- 
1.8.3.1