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Date:   Fri, 11 Sep 2020 23:39:39 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC:     <kuba@...nel.org>, <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 4/7] sfc: select inner-csum-offload TX queues for
 skbs that need it

Won't actually be exercised until we start advertising the corresponding
 offload features.

Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 drivers/net/ethernet/sfc/ptp.c |  3 ++-
 drivers/net/ethernet/sfc/tx.c  |  2 +-
 drivers/net/ethernet/sfc/tx.h  | 26 ++++++++++++++++++++++++++
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index bd99517f06db..2e8c4569f03b 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -43,6 +43,7 @@
 #include "mcdi_pcol.h"
 #include "io.h"
 #include "farch_regs.h"
+#include "tx.h"
 #include "nic.h" /* indirectly includes ptp.h */
 
 /* Maximum number of events expected to make up a PTP event */
@@ -1081,8 +1082,8 @@ static int efx_ptp_synchronize(struct efx_nic *efx, unsigned int num_readings)
 /* Transmit a PTP packet via the dedicated hardware timestamped queue. */
 static void efx_ptp_xmit_skb_queue(struct efx_nic *efx, struct sk_buff *skb)
 {
-	u8 type = skb->ip_summed == CHECKSUM_PARTIAL ? EFX_TXQ_TYPE_OUTER_CSUM : 0;
 	struct efx_ptp_data *ptp_data = efx->ptp_data;
+	u8 type = efx_tx_csum_type_skb(skb);
 	struct efx_tx_queue *tx_queue;
 
 	tx_queue = efx_channel_get_tx_queue(ptp_data->channel, type);
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index bb3b41f9f9c0..13e960b23de8 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -506,7 +506,7 @@ netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
 	EFX_WARN_ON_PARANOID(!netif_device_present(net_dev));
 
 	index = skb_get_queue_mapping(skb);
-	type = skb->ip_summed == CHECKSUM_PARTIAL ? EFX_TXQ_TYPE_OUTER_CSUM : 0;
+	type = efx_tx_csum_type_skb(skb);
 	if (index >= efx->n_tx_channels) {
 		index -= efx->n_tx_channels;
 		type |= EFX_TXQ_TYPE_HIGHPRI;
diff --git a/drivers/net/ethernet/sfc/tx.h b/drivers/net/ethernet/sfc/tx.h
index a3cf06c5570d..f2c4d2f89919 100644
--- a/drivers/net/ethernet/sfc/tx.h
+++ b/drivers/net/ethernet/sfc/tx.h
@@ -18,4 +18,30 @@ unsigned int efx_tx_limit_len(struct efx_tx_queue *tx_queue,
 u8 *efx_tx_get_copy_buffer_limited(struct efx_tx_queue *tx_queue,
 				   struct efx_tx_buffer *buffer, size_t len);
 
+/* What TXQ type will satisfy the checksum offloads required for this skb? */
+static inline unsigned int efx_tx_csum_type_skb(struct sk_buff *skb)
+{
+	if (skb->ip_summed != CHECKSUM_PARTIAL)
+		return 0; /* no checksum offload */
+
+	if (skb->encapsulation &&
+	    skb_checksum_start_offset(skb) == skb_inner_transport_offset(skb)) {
+		/* we only advertise features for IPv4 and IPv6 checksums on
+		 * encapsulated packets, so if the checksum is for the inner
+		 * packet, it must be one of them; no further checking required.
+		 */
+
+		/* Do we also need to offload the outer header checksum? */
+		if (skb_shinfo(skb)->gso_segs > 1 &&
+		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
+		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
+			return EFX_TXQ_TYPE_OUTER_CSUM | EFX_TXQ_TYPE_INNER_CSUM;
+		return EFX_TXQ_TYPE_INNER_CSUM;
+	}
+
+	/* similarly, we only advertise features for IPv4 and IPv6 checksums,
+	 * so it must be one of them. No need for further checks.
+	 */
+	return EFX_TXQ_TYPE_OUTER_CSUM;
+}
 #endif /* EFX_TX_H */

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