linux-kernel - [PATCH 5.15 109/179] nfp: checking parameter process for rx-usecs/tx-usecs is invalid

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Date:   Mon, 29 Nov 2021 19:18:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Diana Wang <na.wang@...igine.com>,
        Simon Horman <simon.horman@...igine.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 109/179] nfp: checking parameter process for rx-usecs/tx-usecs is invalid

From: Diana Wang <na.wang@...igine.com>

[ Upstream commit 3bd6b2a838ba6a3b86d41b077f570b1b61174def ]

Use nn->tlv_caps.me_freq_mhz instead of nn->me_freq_mhz to check whether
rx-usecs/tx-usecs is valid.

This is because nn->tlv_caps.me_freq_mhz represents the clock_freq (MHz) of
the flow processing cores (FPC) on the NIC. While nn->me_freq_mhz is not
be set.

Fixes: ce991ab6662a ("nfp: read ME frequency from vNIC ctrl memory")
Signed-off-by: Diana Wang <na.wang@...igine.com>
Signed-off-by: Simon Horman <simon.horman@...igine.com>
Reviewed-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/netronome/nfp/nfp_net.h         | 3 ---
 drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h
index df203738511bf..0b1865e9f0b59 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h
@@ -565,7 +565,6 @@ struct nfp_net_dp {
  * @exn_name:           Name for Exception interrupt
  * @shared_handler:     Handler for shared interrupts
  * @shared_name:        Name for shared interrupt
- * @me_freq_mhz:        ME clock_freq (MHz)
  * @reconfig_lock:	Protects @reconfig_posted, @reconfig_timer_active,
  *			@reconfig_sync_present and HW reconfiguration request
  *			regs/machinery from async requests (sync must take
@@ -650,8 +649,6 @@ struct nfp_net {
 	irq_handler_t shared_handler;
 	char shared_name[IFNAMSIZ + 8];
 
-	u32 me_freq_mhz;
-
 	bool link_up;
 	spinlock_t link_status_lock;
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
index 0685ece1f155d..be1a358baadb9 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -1343,7 +1343,7 @@ static int nfp_net_set_coalesce(struct net_device *netdev,
 	 * ME timestamp ticks.  There are 16 ME clock cycles for each timestamp
 	 * count.
 	 */
-	factor = nn->me_freq_mhz / 16;
+	factor = nn->tlv_caps.me_freq_mhz / 16;
 
 	/* Each pair of (usecs, max_frames) fields specifies that interrupts
 	 * should be coalesced until
-- 
2.33.0