[dpdk-dev] [PATCH 29/53] net/sfc/base: request info about outer frame in Rx events

[Andrew Rybchenko]

From: Mark Spender <mspender at solarflare.com>

For encapsulated packets, the firmware gives info about the inner frame
fields by default. When not using encapsulation offload, ask for info
about the outer frame instead.

Unless bug69842 is fixed, a driver reload will be needed, at least
on some platforms, when switching from full-featured to low-latency
firmware (though users are unlikely to hit that).

Signed-off-by: Mark Spender <mspender at solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
---
 drivers/net/sfc/base/ef10_rx.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/net/sfc/base/ef10_rx.c b/drivers/net/sfc/base/ef10_rx.c
index 4c74d1f..5ede728 100644
--- a/drivers/net/sfc/base/ef10_rx.c
+++ b/drivers/net/sfc/base/ef10_rx.c
@@ -46,6 +46,7 @@ efx_mcdi_init_rxq(
 	__in		boolean_t disable_scatter,
 	__in		uint32_t ps_bufsize)
 {
+	efx_nic_cfg_t *encp = &(enp->en_nic_cfg);
 	efx_mcdi_req_t req;
 	uint8_t payload[MAX(MC_CMD_INIT_RXQ_EXT_IN_LEN,
 			    MC_CMD_INIT_RXQ_EXT_OUT_LEN)];
@@ -55,6 +56,7 @@ efx_mcdi_init_rxq(
 	uint64_t addr;
 	efx_rc_t rc;
 	uint32_t dma_mode;
+	boolean_t want_outer_classes;
 
 	/* If this changes, then the payload size might need to change. */
 	EFSYS_ASSERT3U(MC_CMD_INIT_RXQ_OUT_LEN, ==, 0);
@@ -65,6 +67,25 @@ efx_mcdi_init_rxq(
 	else
 		dma_mode = MC_CMD_INIT_RXQ_EXT_IN_SINGLE_PACKET;
 
+	if (encp->enc_tunnel_encapsulations_supported != 0) {
+		/*
+		 * WANT_OUTER_CLASSES can only be specified on hardware which
+		 * supports tunnel encapsulation offloads, even though it is
+		 * effectively the behaviour the hardware gives.
+		 *
+		 * Also, on hardware which does support such offloads, older
+		 * firmware rejects the flag if the offloads are not supported
+		 * by the current firmware variant, which means this may fail if
+		 * the capabilities are not updated when the firmware variant
+		 * changes. This is not an issue on newer firmware, as it was
+		 * changed in bug 69842 (v6.4.2.1007) to permit this flag to be
+		 * specified on all firmware variants.
+		 */
+		want_outer_classes = B_TRUE;
+	} else {
+		want_outer_classes = B_FALSE;
+	}
+
 	(void) memset(payload, 0, sizeof (payload));
 	req.emr_cmd = MC_CMD_INIT_RXQ;
 	req.emr_in_buf = payload;
@@ -76,7 +97,7 @@ efx_mcdi_init_rxq(
 	MCDI_IN_SET_DWORD(req, INIT_RXQ_EXT_IN_TARGET_EVQ, target_evq);
 	MCDI_IN_SET_DWORD(req, INIT_RXQ_EXT_IN_LABEL, label);
 	MCDI_IN_SET_DWORD(req, INIT_RXQ_EXT_IN_INSTANCE, instance);
-	MCDI_IN_POPULATE_DWORD_8(req, INIT_RXQ_EXT_IN_FLAGS,
+	MCDI_IN_POPULATE_DWORD_9(req, INIT_RXQ_EXT_IN_FLAGS,
 	    INIT_RXQ_EXT_IN_FLAG_BUFF_MODE, 0,
 	    INIT_RXQ_EXT_IN_FLAG_HDR_SPLIT, 0,
 	    INIT_RXQ_EXT_IN_FLAG_TIMESTAMP, 0,
@@ -85,7 +106,8 @@ efx_mcdi_init_rxq(
 	    INIT_RXQ_EXT_IN_FLAG_DISABLE_SCATTER, disable_scatter,
 	    INIT_RXQ_EXT_IN_DMA_MODE,
 	    dma_mode,
-	    INIT_RXQ_EXT_IN_PACKED_STREAM_BUFF_SIZE, ps_bufsize);
+	    INIT_RXQ_EXT_IN_PACKED_STREAM_BUFF_SIZE, ps_bufsize,
+	    INIT_RXQ_EXT_IN_FLAG_WANT_OUTER_CLASSES, want_outer_classes);
 	MCDI_IN_SET_DWORD(req, INIT_RXQ_EXT_IN_OWNER_ID, 0);
 	MCDI_IN_SET_DWORD(req, INIT_RXQ_EXT_IN_PORT_ID, EVB_PORT_ID_ASSIGNED);
 
-- 
2.7.4