netdev - [PATCH v5 net-next 11/16] sfc_ef100: read datapath caps, implement check

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Date:   Mon, 27 Jul 2020 12:58:26 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>
Subject: [PATCH v5 net-next 11/16] sfc_ef100: read datapath caps, implement
 check_caps

Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 drivers/net/ethernet/sfc/ef100_nic.c | 58 +++++++++++++++++++++++++++-
 drivers/net/ethernet/sfc/ef100_nic.h |  2 +
 2 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
index c6703527bbe9..3fb81d6e8df3 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.c
+++ b/drivers/net/ethernet/sfc/ef100_nic.c
@@ -124,6 +124,49 @@ static void ef100_mcdi_reboot_detected(struct efx_nic *efx)
 {
 }
 
+/*	MCDI calls
+ */
+static int efx_ef100_init_datapath_caps(struct efx_nic *efx)
+{
+	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_CAPABILITIES_V4_OUT_LEN);
+	struct ef100_nic_data *nic_data = efx->nic_data;
+	u8 vi_window_mode;
+	size_t outlen;
+	int rc;
+
+	BUILD_BUG_ON(MC_CMD_GET_CAPABILITIES_IN_LEN != 0);
+
+	rc = efx_mcdi_rpc(efx, MC_CMD_GET_CAPABILITIES, NULL, 0,
+			  outbuf, sizeof(outbuf), &outlen);
+	if (rc)
+		return rc;
+	if (outlen < MC_CMD_GET_CAPABILITIES_V4_OUT_LEN) {
+		netif_err(efx, drv, efx->net_dev,
+			  "unable to read datapath firmware capabilities\n");
+		return -EIO;
+	}
+
+	nic_data->datapath_caps = MCDI_DWORD(outbuf,
+					     GET_CAPABILITIES_OUT_FLAGS1);
+	nic_data->datapath_caps2 = MCDI_DWORD(outbuf,
+					      GET_CAPABILITIES_V2_OUT_FLAGS2);
+
+	vi_window_mode = MCDI_BYTE(outbuf,
+				   GET_CAPABILITIES_V3_OUT_VI_WINDOW_MODE);
+	rc = efx_mcdi_window_mode_to_stride(efx, vi_window_mode);
+	if (rc)
+		return rc;
+
+	if (efx_ef100_has_cap(nic_data->datapath_caps2, TX_TSO_V3))
+		efx->net_dev->features |= NETIF_F_TSO | NETIF_F_TSO6;
+	efx->num_mac_stats = MCDI_WORD(outbuf,
+				       GET_CAPABILITIES_V4_OUT_MAC_STATS_NUM_STATS);
+	netif_dbg(efx, probe, efx->net_dev,
+		  "firmware reports num_mac_stats = %u\n",
+		  efx->num_mac_stats);
+	return 0;
+}
+
 /*	Event handling
  */
 static int ef100_ev_probe(struct efx_channel *channel)
@@ -296,8 +339,16 @@ static int ef100_reset(struct efx_nic *efx, enum reset_type reset_type)
 static unsigned int ef100_check_caps(const struct efx_nic *efx,
 				     u8 flag, u32 offset)
 {
-	/* stub */
-	return 0;
+	const struct ef100_nic_data *nic_data = efx->nic_data;
+
+	switch (offset) {
+	case MC_CMD_GET_CAPABILITIES_V8_OUT_FLAGS1_OFST:
+		return nic_data->datapath_caps & BIT_ULL(flag);
+	case MC_CMD_GET_CAPABILITIES_V8_OUT_FLAGS2_OFST:
+		return nic_data->datapath_caps2 & BIT_ULL(flag);
+	default:
+		return 0;
+	}
 }
 
 /*	NIC level access functions
@@ -408,6 +459,9 @@ static int ef100_probe_main(struct efx_nic *efx)
 	}
 	if (rc)
 		goto fail;
+	rc = efx_ef100_init_datapath_caps(efx);
+	if (rc < 0)
+		goto fail;
 
 	efx->max_vis = EF100_MAX_VIS;
 
diff --git a/drivers/net/ethernet/sfc/ef100_nic.h b/drivers/net/ethernet/sfc/ef100_nic.h
index 5d376e2d98a7..392611cc33b5 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.h
+++ b/drivers/net/ethernet/sfc/ef100_nic.h
@@ -20,6 +20,8 @@ void ef100_remove(struct efx_nic *efx);
 struct ef100_nic_data {
 	struct efx_nic *efx;
 	struct efx_buffer mcdi_buf;
+	u32 datapath_caps;
+	u32 datapath_caps2;
 	u16 warm_boot_count;
 	DECLARE_BITMAP(evq_phases, EFX_MAX_CHANNELS);
 };