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Message-Id: <1635493676-10767-6-git-send-email-michael.chan@broadcom.com>
Date: Fri, 29 Oct 2021 03:47:42 -0400
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, kuba@...nel.org, edwin.peer@...adcom.com,
gospo@...adcom.com, jiri@...dia.com
Subject: [PATCH net-next v2 05/19] bnxt_en: add enable_remote_dev_reset devlink parameter
From: Edwin Peer <edwin.peer@...adcom.com>
The reported parameter value should not take into account the state
of remote drivers. Firmware will reject remote resets as appropriate,
thus it is not strictly necessary to check HOT_RESET_ALLOWED before
attempting to initiate a reset. But we add the check so that we can
provide more intuitive messages when reset is not permitted.
This firmware setting needs to be restored from all functions after
a firmware reset.
Signed-off-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 23 ++++++
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 +
.../net/ethernet/broadcom/bnxt/bnxt_devlink.c | 74 ++++++++++++++++++-
.../net/ethernet/broadcom/bnxt/bnxt_devlink.h | 11 +++
.../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 5 ++
5 files changed, 111 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index cd5932c75997..80fff3d8b31f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7476,6 +7476,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
bp->fw_cap |= BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED;
if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_PTP_PPS_SUPPORTED))
bp->fw_cap |= BNXT_FW_CAP_PTP_PPS;
+ if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_HOT_RESET_IF_SUPPORT))
+ bp->fw_cap |= BNXT_FW_CAP_HOT_RESET_IF;
bp->tx_push_thresh = 0;
if ((flags & FUNC_QCAPS_RESP_FLAGS_PUSH_MODE_SUPPORTED) &&
@@ -12010,6 +12012,27 @@ static void bnxt_fw_reset_writel(struct bnxt *bp, int reg_idx)
}
}
+bool bnxt_hwrm_reset_permitted(struct bnxt *bp)
+{
+ struct hwrm_func_qcfg_output *resp;
+ struct hwrm_func_qcfg_input *req;
+ bool result = true; /* firmware will enforce if unknown */
+
+ if (~bp->fw_cap & BNXT_FW_CAP_HOT_RESET_IF)
+ return result;
+
+ if (hwrm_req_init(bp, req, HWRM_FUNC_QCFG))
+ return result;
+
+ req->fid = cpu_to_le16(0xffff);
+ resp = hwrm_req_hold(bp, req);
+ if (!hwrm_req_send(bp, req))
+ result = !!(le16_to_cpu(resp->flags) &
+ FUNC_QCFG_RESP_FLAGS_HOT_RESET_ALLOWED);
+ hwrm_req_drop(bp, req);
+ return result;
+}
+
static void bnxt_reset_all(struct bnxt *bp)
{
struct bnxt_fw_health *fw_health = bp->fw_health;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 38c23b4106a1..e56f2a27c67a 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1935,6 +1935,7 @@ struct bnxt {
#define BNXT_FW_CAP_VLAN_TX_INSERT 0x02000000
#define BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED 0x04000000
#define BNXT_FW_CAP_PTP_PPS 0x10000000
+ #define BNXT_FW_CAP_HOT_RESET_IF 0x20000000
#define BNXT_FW_CAP_RING_MONITOR 0x40000000
#define BNXT_NEW_RM(bp) ((bp)->fw_cap & BNXT_FW_CAP_NEW_RM)
@@ -2274,6 +2275,7 @@ void bnxt_fw_reset(struct bnxt *bp);
int bnxt_check_rings(struct bnxt *bp, int tx, int rx, bool sh, int tcs,
int tx_xdp);
int bnxt_fw_init_one(struct bnxt *bp);
+bool bnxt_hwrm_reset_permitted(struct bnxt *bp);
int bnxt_setup_mq_tc(struct net_device *dev, u8 tc);
int bnxt_get_max_rings(struct bnxt *, int *, int *, bool);
int bnxt_restore_pf_fw_resources(struct bnxt *bp);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
index 9922c1428129..8673f3c4b581 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
@@ -42,6 +42,26 @@ bnxt_dl_flash_update(struct devlink *dl,
return rc;
}
+static int bnxt_hwrm_remote_dev_reset_set(struct bnxt *bp, bool remote_reset)
+{
+ struct hwrm_func_cfg_input *req;
+ int rc;
+
+ if (~bp->fw_cap & BNXT_FW_CAP_HOT_RESET_IF)
+ return -EOPNOTSUPP;
+
+ rc = hwrm_req_init(bp, req, HWRM_FUNC_CFG);
+ if (rc)
+ return rc;
+
+ req->fid = cpu_to_le16(0xffff);
+ req->enables = cpu_to_le32(FUNC_CFG_REQ_ENABLES_HOT_RESET_IF_SUPPORT);
+ if (remote_reset)
+ req->flags = cpu_to_le32(FUNC_CFG_REQ_FLAGS_HOT_RESET_IF_EN_DIS);
+
+ return hwrm_req_send(bp, req);
+}
+
static int bnxt_fw_reporter_diagnose(struct devlink_health_reporter *reporter,
struct devlink_fmsg *fmsg,
struct netlink_ext_ack *extack)
@@ -272,11 +292,13 @@ void bnxt_dl_health_status_update(struct bnxt *bp, bool healthy)
void bnxt_dl_health_recovery_done(struct bnxt *bp)
{
struct bnxt_fw_health *hlth = bp->fw_health;
+ struct bnxt_dl *dl = devlink_priv(bp->dl);
if (hlth->fatal)
devlink_health_reporter_recovery_done(hlth->fw_fatal_reporter);
else
devlink_health_reporter_recovery_done(hlth->fw_reset_reporter);
+ bnxt_hwrm_remote_dev_reset_set(bp, dl->remote_reset);
}
static int bnxt_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
@@ -332,6 +354,11 @@ static int bnxt_dl_reload_down(struct devlink *dl, bool netns_change,
NL_SET_ERR_MSG_MOD(extack, "Device not capable, requires reboot");
return -EOPNOTSUPP;
}
+ if (!bnxt_hwrm_reset_permitted(bp)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Reset denied by firmware, it may be inhibited by remote driver");
+ return -EPERM;
+ }
rtnl_lock();
if (bp->dev->reg_state == NETREG_UNREGISTERED) {
rtnl_unlock();
@@ -863,6 +890,32 @@ static int bnxt_dl_msix_validate(struct devlink *dl, u32 id,
return 0;
}
+static int bnxt_remote_dev_reset_get(struct devlink *dl, u32 id,
+ struct devlink_param_gset_ctx *ctx)
+{
+ struct bnxt *bp = bnxt_get_bp_from_dl(dl);
+
+ if (~bp->fw_cap & BNXT_FW_CAP_HOT_RESET_IF)
+ return -EOPNOTSUPP;
+
+ ctx->val.vbool = bnxt_dl_get_remote_reset(dl);
+ return 0;
+}
+
+static int bnxt_remote_dev_reset_set(struct devlink *dl, u32 id,
+ struct devlink_param_gset_ctx *ctx)
+{
+ struct bnxt *bp = bnxt_get_bp_from_dl(dl);
+ int rc;
+
+ rc = bnxt_hwrm_remote_dev_reset_set(bp, ctx->val.vbool);
+ if (rc)
+ return rc;
+
+ bnxt_dl_set_remote_reset(dl, ctx->val.vbool);
+ return rc;
+}
+
static const struct devlink_param bnxt_dl_params[] = {
DEVLINK_PARAM_GENERIC(ENABLE_SRIOV,
BIT(DEVLINK_PARAM_CMODE_PERMANENT),
@@ -885,17 +938,25 @@ static const struct devlink_param bnxt_dl_params[] = {
BIT(DEVLINK_PARAM_CMODE_PERMANENT),
bnxt_dl_nvm_param_get, bnxt_dl_nvm_param_set,
NULL),
+ /* keep REMOTE_DEV_RESET last, it is excluded based on caps */
+ DEVLINK_PARAM_GENERIC(ENABLE_REMOTE_DEV_RESET,
+ BIT(DEVLINK_PARAM_CMODE_RUNTIME),
+ bnxt_remote_dev_reset_get,
+ bnxt_remote_dev_reset_set, NULL),
};
static int bnxt_dl_params_register(struct bnxt *bp)
{
+ int num_params = ARRAY_SIZE(bnxt_dl_params);
int rc;
if (bp->hwrm_spec_code < 0x10600)
return 0;
- rc = devlink_params_register(bp->dl, bnxt_dl_params,
- ARRAY_SIZE(bnxt_dl_params));
+ if (~bp->fw_cap & BNXT_FW_CAP_HOT_RESET_IF)
+ num_params--;
+
+ rc = devlink_params_register(bp->dl, bnxt_dl_params, num_params);
if (rc)
netdev_warn(bp->dev, "devlink_params_register failed. rc=%d\n",
rc);
@@ -904,11 +965,15 @@ static int bnxt_dl_params_register(struct bnxt *bp)
static void bnxt_dl_params_unregister(struct bnxt *bp)
{
+ int num_params = ARRAY_SIZE(bnxt_dl_params);
+
if (bp->hwrm_spec_code < 0x10600)
return;
- devlink_params_unregister(bp->dl, bnxt_dl_params,
- ARRAY_SIZE(bnxt_dl_params));
+ if (~bp->fw_cap & BNXT_FW_CAP_HOT_RESET_IF)
+ num_params--;
+
+ devlink_params_unregister(bp->dl, bnxt_dl_params, num_params);
}
int bnxt_dl_register(struct bnxt *bp)
@@ -933,6 +998,7 @@ int bnxt_dl_register(struct bnxt *bp)
bp->dl = dl;
bp_dl = devlink_priv(dl);
bp_dl->bp = bp;
+ bnxt_dl_set_remote_reset(dl, true);
/* Add switchdev eswitch mode setting, if SRIOV supported */
if (pci_find_ext_capability(bp->pdev, PCI_EXT_CAP_ID_SRIOV) &&
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.h
index a189cfe1e441..456e18c4badf 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.h
@@ -13,6 +13,7 @@
/* Struct to hold housekeeping info needed by devlink interface */
struct bnxt_dl {
struct bnxt *bp; /* back ptr to the controlling dev */
+ bool remote_reset;
};
static inline struct bnxt *bnxt_get_bp_from_dl(struct devlink *dl)
@@ -27,6 +28,16 @@ static inline void bnxt_dl_remote_reload(struct bnxt *bp)
BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE));
}
+static inline bool bnxt_dl_get_remote_reset(struct devlink *dl)
+{
+ return ((struct bnxt_dl *)devlink_priv(dl))->remote_reset;
+}
+
+static inline void bnxt_dl_set_remote_reset(struct devlink *dl, bool value)
+{
+ ((struct bnxt_dl *)devlink_priv(dl))->remote_reset = value;
+}
+
#define NVM_OFF_MSIX_VEC_PER_PF_MAX 108
#define NVM_OFF_MSIX_VEC_PER_PF_MIN 114
#define NVM_OFF_IGNORE_ARI 164
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index ac8df5c6906f..15c518024965 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -2187,6 +2187,11 @@ int bnxt_hwrm_firmware_reset(struct net_device *dev, u8 proc_type,
struct hwrm_fw_reset_input *req;
int rc;
+ if (!bnxt_hwrm_reset_permitted(bp)) {
+ netdev_warn(bp->dev, "Reset denied by firmware, it may be inhibited by remote driver");
+ return -EPERM;
+ }
+
rc = hwrm_req_init(bp, req, HWRM_FW_RESET);
if (rc)
return rc;
--
2.18.1
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