bnxt_en: Add a new BNXT_FW_RESET_STATE_POLL_FW_DOWN state.

This new state is required when firmware indicates that the error
recovery process requires polling for firmware state to be completely
down before initiating reset.  For example, firmware may take some
time to collect the crash dump before it is down and ready to be
reset.

Signed-off-by: Vasundhara Volam <[email protected]>
Signed-off-by: Michael Chan <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Vasundhara Volam

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -6947,6 +6947,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->fw_cap |= BNXT_FW_CAP_EXT_STATS_SUPPORTED;
 	if (flags &  FUNC_QCAPS_RESP_FLAGS_ERROR_RECOVERY_CAPABLE)
 		bp->fw_cap |= BNXT_FW_CAP_ERROR_RECOVERY;
+	if (flags & FUNC_QCAPS_RESP_FLAGS_ERR_RECOVER_RELOAD)
+		bp->fw_cap |= BNXT_FW_CAP_ERR_RECOVER_RELOAD;
 
 	bp->tx_push_thresh = 0;
 	if (flags & FUNC_QCAPS_RESP_FLAGS_PUSH_MODE_SUPPORTED)
@@ -10097,6 +10099,8 @@ static void bnxt_force_fw_reset(struct bnxt *bp)
 		wait_dsecs = fw_health->normal_func_wait_dsecs;
 		bp->fw_reset_state = BNXT_FW_RESET_STATE_ENABLE_DEV;
 	}
+
+	bp->fw_reset_min_dsecs = fw_health->post_reset_wait_dsecs;
 	bp->fw_reset_max_dsecs = fw_health->post_reset_max_wait_dsecs;
 	bnxt_queue_fw_reset_work(bp, wait_dsecs * HZ / 10);
 }
@@ -10138,7 +10142,7 @@ void bnxt_fw_reset(struct bnxt *bp)
 	bnxt_rtnl_lock_sp(bp);
 	if (test_bit(BNXT_STATE_OPEN, &bp->state) &&
 	    !test_bit(BNXT_STATE_IN_FW_RESET, &bp->state)) {
-		int n = 0;
+		int n = 0, tmo;
 
 		set_bit(BNXT_STATE_IN_FW_RESET, &bp->state);
 		if (bp->pf.active_vfs &&
@@ -10161,8 +10165,14 @@ void bnxt_fw_reset(struct bnxt *bp)
 			goto fw_reset_exit;
 		}
 		bnxt_fw_reset_close(bp);
-		bp->fw_reset_state = BNXT_FW_RESET_STATE_ENABLE_DEV;
-		bnxt_queue_fw_reset_work(bp, bp->fw_reset_min_dsecs * HZ / 10);
+		if (bp->fw_cap & BNXT_FW_CAP_ERR_RECOVER_RELOAD) {
+			bp->fw_reset_state = BNXT_FW_RESET_STATE_POLL_FW_DOWN;
+			tmo = HZ / 10;
+		} else {
+			bp->fw_reset_state = BNXT_FW_RESET_STATE_ENABLE_DEV;
+			tmo = bp->fw_reset_min_dsecs * HZ / 10;
+		}
+		bnxt_queue_fw_reset_work(bp, tmo);
 	}
 fw_reset_exit:
 	bnxt_rtnl_unlock_sp(bp);
@@ -10605,6 +10615,7 @@ static void bnxt_fw_reset_task(struct work_struct *work)
 	switch (bp->fw_reset_state) {
 	case BNXT_FW_RESET_STATE_POLL_VF: {
 		int n = bnxt_get_registered_vfs(bp);
+		int tmo;
 
 		if (n < 0) {
 			netdev_err(bp->dev, "Firmware reset aborted, subsequent func_qcfg cmd failed, rc = %d, %d msecs since reset timestamp\n",
@@ -10626,11 +10637,38 @@ static void bnxt_fw_reset_task(struct work_struct *work)
 		bp->fw_reset_timestamp = jiffies;
 		rtnl_lock();
 		bnxt_fw_reset_close(bp);
-		bp->fw_reset_state = BNXT_FW_RESET_STATE_ENABLE_DEV;
+		if (bp->fw_cap & BNXT_FW_CAP_ERR_RECOVER_RELOAD) {
+			bp->fw_reset_state = BNXT_FW_RESET_STATE_POLL_FW_DOWN;
+			tmo = HZ / 10;
+		} else {
+			bp->fw_reset_state = BNXT_FW_RESET_STATE_ENABLE_DEV;
+			tmo = bp->fw_reset_min_dsecs * HZ / 10;
+		}
 		rtnl_unlock();
-		bnxt_queue_fw_reset_work(bp, bp->fw_reset_min_dsecs * HZ / 10);
+		bnxt_queue_fw_reset_work(bp, tmo);
 		return;
 	}
+	case BNXT_FW_RESET_STATE_POLL_FW_DOWN: {
+		u32 val;
+
+		val = bnxt_fw_health_readl(bp, BNXT_FW_HEALTH_REG);
+		if (!(val & BNXT_FW_STATUS_SHUTDOWN) &&
+		    !time_after(jiffies, bp->fw_reset_timestamp +
+		    (bp->fw_reset_max_dsecs * HZ / 10))) {
+			bnxt_queue_fw_reset_work(bp, HZ / 5);
+			return;
+		}
+
+		if (!bp->fw_health->master) {
+			u32 wait_dsecs = bp->fw_health->normal_func_wait_dsecs;
+
+			bp->fw_reset_state = BNXT_FW_RESET_STATE_ENABLE_DEV;
+			bnxt_queue_fw_reset_work(bp, wait_dsecs * HZ / 10);
+			return;
+		}
+		bp->fw_reset_state = BNXT_FW_RESET_STATE_RESET_FW;
+	}
+	/* fall through */
 	case BNXT_FW_RESET_STATE_RESET_FW: {
 		u32 wait_dsecs = bp->fw_health->post_reset_wait_dsecs;
 

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1398,6 +1398,7 @@ struct bnxt_fw_reporter_ctx {
 #define BNXT_FW_HEALTH_WIN_MAP_OFF	8
 
 #define BNXT_FW_STATUS_HEALTHY		0x8000
+#define BNXT_FW_STATUS_SHUTDOWN		0x100000
 
 struct bnxt {
 	void __iomem		*bar0;
@@ -1655,6 +1656,7 @@ struct bnxt {
 	#define BNXT_FW_CAP_CFA_RFS_RING_TBL_IDX	0x00010000
 	#define BNXT_FW_CAP_PCIE_STATS_SUPPORTED	0x00020000
 	#define BNXT_FW_CAP_EXT_STATS_SUPPORTED		0x00040000
+	#define BNXT_FW_CAP_ERR_RECOVER_RELOAD		0x00100000
 
 #define BNXT_NEW_RM(bp)		((bp)->fw_cap & BNXT_FW_CAP_NEW_RM)
 	u32			hwrm_spec_code;
@@ -1744,6 +1746,7 @@ struct bnxt {
 #define BNXT_FW_RESET_STATE_ENABLE_DEV	3
 #define BNXT_FW_RESET_STATE_POLL_FW	4
 #define BNXT_FW_RESET_STATE_OPENING	5
+#define BNXT_FW_RESET_STATE_POLL_FW_DOWN	6
 
 	u16			fw_reset_min_dsecs;
 #define BNXT_DFLT_FW_RST_MIN_DSECS	20