linux-kernel - [PATCH AUTOSEL 4.9 57/98] qed: Warn PTT usage by wrong hw-function

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Message-Id: <20181025141423.213774-57-sashal@kernel.org>
Date:   Thu, 25 Oct 2018 10:13:42 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Mintz, Yuval" <Yuval.Mintz@...ium.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.9 57/98] qed: Warn PTT usage by wrong hw-function

From: "Mintz, Yuval" <Yuval.Mintz@...ium.com>

[ Upstream commit 3a50d3518dcba44f8a0f9356b7140fe1499984ea ]

PTT entries are per-hwfn; If some errneous flow is trying
to use a PTT belonging to a differnet hwfn warn user, as this
can break every register accessing flow later and is very hard
to root-cause.

Signed-off-by: Yuval Mintz <Yuval.Mintz@...ium.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/qlogic/qed/qed_hw.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_hw.c b/drivers/net/ethernet/qlogic/qed/qed_hw.c
index 6e4fae9b1430..944749cfe092 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_hw.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_hw.c
@@ -34,6 +34,7 @@ struct qed_ptt {
 	struct list_head	list_entry;
 	unsigned int		idx;
 	struct pxp_ptt_entry	pxp;
+	u8			hwfn_id;
 };
 
 struct qed_ptt_pool {
@@ -55,6 +56,7 @@ int qed_ptt_pool_alloc(struct qed_hwfn *p_hwfn)
 		p_pool->ptts[i].idx = i;
 		p_pool->ptts[i].pxp.offset = QED_BAR_INVALID_OFFSET;
 		p_pool->ptts[i].pxp.pretend.control = 0;
+		p_pool->ptts[i].hwfn_id = p_hwfn->my_id;
 		if (i >= RESERVED_PTT_MAX)
 			list_add(&p_pool->ptts[i].list_entry,
 				 &p_pool->free_list);
@@ -169,6 +171,11 @@ static u32 qed_set_ptt(struct qed_hwfn *p_hwfn,
 
 	offset = hw_addr - win_hw_addr;
 
+	if (p_ptt->hwfn_id != p_hwfn->my_id)
+		DP_NOTICE(p_hwfn,
+			  "ptt[%d] of hwfn[%02x] is used by hwfn[%02x]!\n",
+			  p_ptt->idx, p_ptt->hwfn_id, p_hwfn->my_id);
+
 	/* Verify the address is within the window */
 	if (hw_addr < win_hw_addr ||
 	    offset >= PXP_EXTERNAL_BAR_PF_WINDOW_SINGLE_SIZE) {
-- 
2.17.1