4.4-stable review patch. If anyone has any objections, please let me know.
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From: Sudarsana Reddy Kalluru sudarsana.kalluru@cavium.com
[ Upstream commit 484c016d9392786ce5c74017c206c706f29f823d ]
Driver performs the internal reload when it receives tx-timeout event from the OS. Internal reload might fail in some scenarios e.g., fatal HW issues. In such cases OS still see the link, which would result in undesirable functionalities such as re-generation of tx-timeouts. The patch addresses this issue by indicating the link-down to OS when tx-timeout is detected, and keeping the link in down state till the internal reload is successful.
Please consider applying it to 'net' branch.
Signed-off-by: Sudarsana Reddy Kalluru Sudarsana.Kalluru@cavium.com Signed-off-by: Ariel Elior ariel.elior@cavium.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/broadcom/bnx2x/bnx2x.h | 1 + drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 6 ++++++ drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 6 ++++++ 3 files changed, 13 insertions(+)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h @@ -1634,6 +1634,7 @@ struct bnx2x { struct link_vars link_vars; u32 link_cnt; struct bnx2x_link_report_data last_reported_link; + bool force_link_down;
struct mdio_if_info mdio;
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c @@ -1277,6 +1277,11 @@ void __bnx2x_link_report(struct bnx2x *b { struct bnx2x_link_report_data cur_data;
+ if (bp->force_link_down) { + bp->link_vars.link_up = 0; + return; + } + /* reread mf_cfg */ if (IS_PF(bp) && !CHIP_IS_E1(bp)) bnx2x_read_mf_cfg(bp); @@ -2840,6 +2845,7 @@ int bnx2x_nic_load(struct bnx2x *bp, int bp->pending_max = 0; }
+ bp->force_link_down = false; if (bp->port.pmf) { rc = bnx2x_initial_phy_init(bp, load_mode); if (rc) --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c @@ -10222,6 +10222,12 @@ static void bnx2x_sp_rtnl_task(struct wo bp->sp_rtnl_state = 0; smp_mb();
+ /* Immediately indicate link as down */ + bp->link_vars.link_up = 0; + bp->force_link_down = true; + netif_carrier_off(bp->dev); + BNX2X_ERR("Indicating link is down due to Tx-timeout\n"); + bnx2x_nic_unload(bp, UNLOAD_NORMAL, true); bnx2x_nic_load(bp, LOAD_NORMAL);