qed: Don't use attention PTT for configuring BW

Commit 653d2ffd6405 ("qed*: Fix link indication race") introduced another
race - one of the inner functions called from the link-change flow is
explicitly using the slowpath context dedicated PTT instead of gaining
that PTT from the caller. Since this flow can now be called from
a different context as well, we're in risk of the PTT breaking.

Fixes: 653d2ffd6405 ("qed*: Fix link indication race")
Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qlogic/qed/qed.h b/drivers/net/ethernet/qlogic/qed/qed.h
index 61a9cd5..00c17fa 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed.h
+++ b/drivers/net/ethernet/qlogic/qed/qed.h
@@ -688,7 +688,9 @@ static inline u8 qed_concrete_to_sw_fid(struct qed_dev *cdev,
 #define OOO_LB_TC 9
 
 int qed_configure_vport_wfq(struct qed_dev *cdev, u16 vp_id, u32 rate);
-void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev, u32 min_pf_rate);
+void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev,
+                                        struct qed_ptt *p_ptt,
+                                        u32 min_pf_rate);
 
 void qed_clean_wfq_db(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt);
 #define QED_LEADING_HWFN(dev)   (&dev->hwfns[0])

diff --git a/drivers/net/ethernet/qlogic/qed/qed_dev.c b/drivers/net/ethernet/qlogic/qed/qed_dev.c
index d6c5a81..e2a081c 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed_dev.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_dev.c
@@ -3198,7 +3198,8 @@ int qed_configure_vport_wfq(struct qed_dev *cdev, u16 vp_id, u32 rate)
 }
 
 /* API to configure WFQ from mcp link change */
-void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev, u32 min_pf_rate)
+void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev,
+                                        struct qed_ptt *p_ptt, u32 min_pf_rate)
 {
        int i;
 
@@ -3212,8 +3213,7 @@ void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev, u32 min_pf_rate)
        for_each_hwfn(cdev, i) {
                struct qed_hwfn *p_hwfn = &cdev->hwfns[i];
 
-               __qed_configure_vp_wfq_on_link_change(p_hwfn,
-                                                     p_hwfn->p_dpc_ptt,
+               __qed_configure_vp_wfq_on_link_change(p_hwfn, p_ptt,
                                                      min_pf_rate);
        }
 }

diff --git a/drivers/net/ethernet/qlogic/qed/qed_mcp.c b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
index 314022d..87fde20 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed_mcp.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
@@ -679,7 +679,8 @@ static void qed_mcp_handle_link_change(struct qed_hwfn *p_hwfn,
 
        /* Min bandwidth configuration */
        __qed_configure_pf_min_bandwidth(p_hwfn, p_ptt, p_link, min_bw);
-       qed_configure_vp_wfq_on_link_change(p_hwfn->cdev, p_link->min_pf_rate);
+       qed_configure_vp_wfq_on_link_change(p_hwfn->cdev, p_ptt,
+                                           p_link->min_pf_rate);
 
        p_link->an = !!(status & LINK_STATUS_AUTO_NEGOTIATE_ENABLED);
        p_link->an_complete = !!(status &