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qed: Prevent MF link notifications 

When device is configured for Multi-function mode, some older management
firmware might incorrectly notify interfaces of link changes while they
haven't requested the physical link configuration to be set.
This can create bizzare race conditions where unloading interfaces are
getting notified that the link is up.

Let the driver compensate - store the logical requested state of the link
and don't propagate notifications after protocol driver explicitly
requires the link to be unset.

Signed-off-by: Sudarsana Reddy Kalluru <sudarsana.kalluru@qlogic.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sudarsana Reddy Kalluru 2016-03-09 09:16:23 +02:00 committed by David S. Miller
parent 627caa9d31
commit fc916ff202
2 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/qlogic/qed/qed.h
View File

@ -303,6 +303,9 @@ struct qed_hwfn {
bool b_int_enabled;
bool b_int_requested;
/* True if the driver requests for the link */
bool b_drv_link_init;
struct qed_mcp_info *mcp_info;
struct qed_hw_cid_data *p_tx_cids;

7
drivers/net/ethernet/qlogic/qed/qed_mcp.c
View File

@ -390,7 +390,10 @@ static void qed_mcp_handle_link_change(struct qed_hwfn *p_hwfn,
return;
}
p_link->link_up = !!(status & LINK_STATUS_LINK_UP);
if (p_hwfn->b_drv_link_init)
p_link->link_up = !!(status & LINK_STATUS_LINK_UP);
else
p_link->link_up = false;
p_link->full_duplex = true;
switch ((status & LINK_STATUS_SPEED_AND_DUPLEX_MASK)) {
@ -520,6 +523,8 @@ int qed_mcp_set_link(struct qed_hwfn *p_hwfn,
offsetof(struct public_drv_mb, union_data) + i,
((u32 *)&phy_cfg)[i >> 2]);
p_hwfn->b_drv_link_init = b_up;
if (b_up) {
DP_VERBOSE(p_hwfn, NETIF_MSG_LINK,
"Configuring Link: Speed 0x%08x, Pause 0x%08x, adv_speed 0x%08x, loopback 0x%08x, features 0x%08x\n",