[dpdk-dev] [PATCH 24/37] net/sfc/base: add routine to check for hardware presence

[Andrew Rybchenko]

From: Andy Moreton <amoreton at solarflare.com>

Add efx_nic_hw_unavailable() routine to check for hardware presence
before continuing with NIC operations.

Signed-off-by: Andy Moreton <amoreton at solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
---
 drivers/net/sfc/base/ef10_ev.c   | 10 ++++++----
 drivers/net/sfc/base/ef10_impl.h |  4 ++++
 drivers/net/sfc/base/ef10_nic.c  | 22 ++++++++++++++++++++++
 drivers/net/sfc/base/efx.h       |  4 ++++
 drivers/net/sfc/base/efx_impl.h  |  2 ++
 drivers/net/sfc/base/efx_mcdi.c  |  6 ++++++
 drivers/net/sfc/base/efx_nic.c   | 27 +++++++++++++++++++++++++++
 7 files changed, 71 insertions(+), 4 deletions(-)

diff --git a/drivers/net/sfc/base/ef10_ev.c b/drivers/net/sfc/base/ef10_ev.c
index 287550605..cdf835f03 100644
--- a/drivers/net/sfc/base/ef10_ev.c
+++ b/drivers/net/sfc/base/ef10_ev.c
@@ -863,8 +863,9 @@ ef10_ev_rx(
 
 	EFX_EV_QSTAT_INCR(eep, EV_RX);
 
-	/* Discard events after RXQ/TXQ errors */
-	if (enp->en_reset_flags & (EFX_RESET_RXQ_ERR | EFX_RESET_TXQ_ERR))
+	/* Discard events after RXQ/TXQ errors, or hardware not available */
+	if (enp->en_reset_flags &
+	    (EFX_RESET_RXQ_ERR | EFX_RESET_TXQ_ERR | EFX_RESET_HW_UNAVAIL))
 		return (B_FALSE);
 
 	/* Basic packet information */
@@ -1064,8 +1065,9 @@ ef10_ev_tx(
 
 	EFX_EV_QSTAT_INCR(eep, EV_TX);
 
-	/* Discard events after RXQ/TXQ errors */
-	if (enp->en_reset_flags & (EFX_RESET_RXQ_ERR | EFX_RESET_TXQ_ERR))
+	/* Discard events after RXQ/TXQ errors, or hardware not available */
+	if (enp->en_reset_flags &
+	    (EFX_RESET_RXQ_ERR | EFX_RESET_TXQ_ERR | EFX_RESET_HW_UNAVAIL))
 		return (B_FALSE);
 
 	if (EFX_QWORD_FIELD(*eqp, ESF_DZ_TX_DROP_EVENT) != 0) {
diff --git a/drivers/net/sfc/base/ef10_impl.h b/drivers/net/sfc/base/ef10_impl.h
index 503f02362..0214a75ef 100644
--- a/drivers/net/sfc/base/ef10_impl.h
+++ b/drivers/net/sfc/base/ef10_impl.h
@@ -190,6 +190,10 @@ extern	__checkReturn	efx_rc_t
 ef10_nic_init(
 	__in		efx_nic_t *enp);
 
+extern	__checkReturn	boolean_t
+ef10_nic_hw_unavailable(
+	__in		efx_nic_t *enp);
+
 #if EFSYS_OPT_DIAG
 
 extern	__checkReturn	efx_rc_t
diff --git a/drivers/net/sfc/base/ef10_nic.c b/drivers/net/sfc/base/ef10_nic.c
index 332f6ef81..ff96a7ff2 100644
--- a/drivers/net/sfc/base/ef10_nic.c
+++ b/drivers/net/sfc/base/ef10_nic.c
@@ -2304,6 +2304,28 @@ ef10_nic_get_bar_region(
 	return (rc);
 }
 
+	__checkReturn	boolean_t
+ef10_nic_hw_unavailable(
+	__in		efx_nic_t *enp)
+{
+	efx_dword_t dword;
+
+	if (enp->en_reset_flags & EFX_RESET_HW_UNAVAIL)
+		return (B_TRUE);
+
+	EFX_BAR_READD(enp, ER_DZ_BIU_MC_SFT_STATUS_REG, &dword, B_FALSE);
+	if (EFX_DWORD_FIELD(dword, EFX_DWORD_0) == 0xffffffff)
+		goto unavail;
+
+	return (B_FALSE);
+
+unavail:
+	EFSYS_PROBE(hw_unavail);
+	enp->en_reset_flags |= EFX_RESET_HW_UNAVAIL;
+
+	return (B_TRUE);
+}
+
 			void
 ef10_nic_fini(
 	__in		efx_nic_t *enp)
diff --git a/drivers/net/sfc/base/efx.h b/drivers/net/sfc/base/efx.h
index 2356a9294..fce519037 100644
--- a/drivers/net/sfc/base/efx.h
+++ b/drivers/net/sfc/base/efx.h
@@ -155,6 +155,10 @@ extern	__checkReturn	efx_rc_t
 efx_nic_reset(
 	__in		efx_nic_t *enp);
 
+extern	__checkReturn	boolean_t
+efx_nic_hw_unavailable(
+	__in		efx_nic_t *enp);
+
 #if EFSYS_OPT_DIAG
 
 extern	__checkReturn	efx_rc_t
diff --git a/drivers/net/sfc/base/efx_impl.h b/drivers/net/sfc/base/efx_impl.h
index 78df43018..8a7dc8cf6 100644
--- a/drivers/net/sfc/base/efx_impl.h
+++ b/drivers/net/sfc/base/efx_impl.h
@@ -59,6 +59,7 @@ extern "C" {
 #define	EFX_RESET_PHY		0x00000001
 #define	EFX_RESET_RXQ_ERR	0x00000002
 #define	EFX_RESET_TXQ_ERR	0x00000004
+#define	EFX_RESET_HW_UNAVAIL	0x00000008
 
 typedef enum efx_mac_type_e {
 	EFX_MAC_INVALID = 0,
@@ -356,6 +357,7 @@ typedef struct efx_nic_ops_s {
 	efx_rc_t	(*eno_get_vi_pool)(efx_nic_t *, uint32_t *);
 	efx_rc_t	(*eno_get_bar_region)(efx_nic_t *, efx_nic_region_t,
 					uint32_t *, size_t *);
+	boolean_t	(*eno_hw_unavailable)(efx_nic_t *);
 #if EFSYS_OPT_DIAG
 	efx_rc_t	(*eno_register_test)(efx_nic_t *);
 #endif	/* EFSYS_OPT_DIAG */
diff --git a/drivers/net/sfc/base/efx_mcdi.c b/drivers/net/sfc/base/efx_mcdi.c
index 84d8452e4..c8d670c23 100644
--- a/drivers/net/sfc/base/efx_mcdi.c
+++ b/drivers/net/sfc/base/efx_mcdi.c
@@ -496,6 +496,12 @@ efx_mcdi_request_poll(
 	EFSYS_ASSERT(!emip->emi_ev_cpl);
 	emrp = emip->emi_pending_req;
 
+	/* Check if hardware is unavailable */
+	if (efx_nic_hw_unavailable(enp)) {
+		EFSYS_UNLOCK(enp->en_eslp, state);
+		return (B_FALSE);
+	}
+
 	/* Check for reboot atomically w.r.t efx_mcdi_request_start */
 	if (emip->emi_poll_cnt++ == 0) {
 		if ((rc = efx_mcdi_poll_reboot(enp)) != 0) {
diff --git a/drivers/net/sfc/base/efx_nic.c b/drivers/net/sfc/base/efx_nic.c
index c364bffba..22e464a4e 100644
--- a/drivers/net/sfc/base/efx_nic.c
+++ b/drivers/net/sfc/base/efx_nic.c
@@ -100,6 +100,7 @@ static const efx_nic_ops_t	__efx_nic_siena_ops = {
 	siena_nic_init,			/* eno_init */
 	NULL,				/* eno_get_vi_pool */
 	NULL,				/* eno_get_bar_region */
+	NULL,				/* eno_hw_unavailable */
 #if EFSYS_OPT_DIAG
 	siena_nic_register_test,	/* eno_register_test */
 #endif	/* EFSYS_OPT_DIAG */
@@ -119,6 +120,7 @@ static const efx_nic_ops_t	__efx_nic_hunt_ops = {
 	ef10_nic_init,			/* eno_init */
 	ef10_nic_get_vi_pool,		/* eno_get_vi_pool */
 	ef10_nic_get_bar_region,	/* eno_get_bar_region */
+	ef10_nic_hw_unavailable,	/* eno_hw_unavailable */
 #if EFSYS_OPT_DIAG
 	ef10_nic_register_test,		/* eno_register_test */
 #endif	/* EFSYS_OPT_DIAG */
@@ -138,6 +140,7 @@ static const efx_nic_ops_t	__efx_nic_medford_ops = {
 	ef10_nic_init,			/* eno_init */
 	ef10_nic_get_vi_pool,		/* eno_get_vi_pool */
 	ef10_nic_get_bar_region,	/* eno_get_bar_region */
+	ef10_nic_hw_unavailable,	/* eno_hw_unavailable */
 #if EFSYS_OPT_DIAG
 	ef10_nic_register_test,		/* eno_register_test */
 #endif	/* EFSYS_OPT_DIAG */
@@ -157,6 +160,7 @@ static const efx_nic_ops_t	__efx_nic_medford2_ops = {
 	ef10_nic_init,			/* eno_init */
 	ef10_nic_get_vi_pool,		/* eno_get_vi_pool */
 	ef10_nic_get_bar_region,	/* eno_get_bar_region */
+	ef10_nic_hw_unavailable,	/* eno_hw_unavailable */
 #if EFSYS_OPT_DIAG
 	ef10_nic_register_test,		/* eno_register_test */
 #endif	/* EFSYS_OPT_DIAG */
@@ -652,6 +656,29 @@ efx_nic_get_fw_version(
 	return (rc);
 }
 
+	__checkReturn	boolean_t
+efx_nic_hw_unavailable(
+	__in		efx_nic_t *enp)
+{
+	const efx_nic_ops_t *enop = enp->en_enop;
+
+	EFSYS_ASSERT3U(enp->en_magic, ==, EFX_NIC_MAGIC);
+	/* NOTE: can be used by MCDI before NIC probe */
+
+	if (enop->eno_hw_unavailable != NULL) {
+		if ((enop->eno_hw_unavailable)(enp) != B_FALSE)
+			goto unavail;
+	}
+
+	return (B_FALSE);
+
+unavail:
+	EFSYS_PROBE(hw_unavail);
+
+	return (B_TRUE);
+}
+
+
 #if EFSYS_OPT_DIAG
 
 	__checkReturn	efx_rc_t
-- 
2.17.1