[dpdk-stable] patch 'common/sfc_efx/base: check for MAE privilege' has been queued to stable release 20.11.1

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/07/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/fd0e7135ccd69adf74aa3486cbdb52d2c3be98e7

Thanks.

Luca Boccassi

---
>From fd0e7135ccd69adf74aa3486cbdb52d2c3be98e7 Mon Sep 17 00:00:00 2001
From: Ivan Malov <ivan.malov at oktetlabs.ru>
Date: Fri, 11 Dec 2020 18:34:21 +0300
Subject: [PATCH] common/sfc_efx/base: check for MAE privilege

[ upstream commit be2f2be77ce2ee52cbc15ba4831152974990ac5c ]

VFs can't control MAE, so it's important to override the general
MAE capability bit by taking MAE privilege into account. Reorder
the code slightly to have the privileges queried before datapath
capabilities are discovered and add required MAE privilege check.

Fixes: eb4e80085fae ("common/sfc_efx/base: indicate support for MAE")

Signed-off-by: Ivan Malov <ivan.malov at oktetlabs.ru>
Reviewed-by: Andy Moreton <amoreton at xilinx.com>
Reviewed-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
---
 drivers/common/sfc_efx/base/ef10_nic.c | 48 ++++++++++++++++----------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/drivers/common/sfc_efx/base/ef10_nic.c b/drivers/common/sfc_efx/base/ef10_nic.c
index 68414d9fa9..9dccde9576 100644
--- a/drivers/common/sfc_efx/base/ef10_nic.c
+++ b/drivers/common/sfc_efx/base/ef10_nic.c
@@ -1423,11 +1423,19 @@ ef10_get_datapath_caps(
 
 #if EFSYS_OPT_MAE
 	/*
-	 * Indicate support for MAE.
-	 * MAE is supported by Riverhead boards starting with R2,
-	 * and it is required that FW is built with MAE support, too.
+	 * Check support for EF100 Match Action Engine (MAE).
+	 * MAE hardware is present on Riverhead boards (from R2),
+	 * and on Keystone, and requires support in firmware.
+	 *
+	 * MAE control operations require MAE control privilege,
+	 * which is not available for VFs.
+	 *
+	 * Privileges can change dynamically at runtime: we assume
+	 * MAE support requires the privilege is granted initially,
+	 * and ignore later dynamic changes.
 	 */
-	if (CAP_FLAGS3(req, MAE_SUPPORTED))
+	if (CAP_FLAGS3(req, MAE_SUPPORTED) &&
+	    EFX_MCDI_HAVE_PRIVILEGE(encp->enc_privilege_mask, MAE))
 		encp->enc_mae_supported = B_TRUE;
 	else
 		encp->enc_mae_supported = B_FALSE;
@@ -1896,6 +1904,18 @@ efx_mcdi_nic_board_cfg(
 
 	EFX_MAC_ADDR_COPY(encp->enc_mac_addr, mac_addr);
 
+	/*
+	 * Get the current privilege mask. Note that this may be modified
+	 * dynamically, so for most cases the value is informational only.
+	 * If the privilege being discovered can't be granted dynamically,
+	 * it's fine to rely on the value. In all other cases, DO NOT use
+	 * the privilege mask to check for sufficient privileges, as that
+	 * can result in time-of-check/time-of-use bugs.
+	 */
+	if ((rc = ef10_get_privilege_mask(enp, &mask)) != 0)
+		goto fail6;
+	encp->enc_privilege_mask = mask;
+
 	/* Board configuration (legacy) */
 	rc = efx_mcdi_get_board_cfg(enp, &board_type, NULL, NULL);
 	if (rc != 0) {
@@ -1903,14 +1923,14 @@ efx_mcdi_nic_board_cfg(
 		if (rc == EACCES)
 			board_type = 0;
 		else
-			goto fail6;
+			goto fail7;
 	}
 
 	encp->enc_board_type = board_type;
 
 	/* Fill out fields in enp->en_port and enp->en_nic_cfg from MCDI */
 	if ((rc = efx_mcdi_get_phy_cfg(enp)) != 0)
-		goto fail7;
+		goto fail8;
 
 	/*
 	 * Firmware with support for *_FEC capability bits does not
@@ -1929,18 +1949,18 @@ efx_mcdi_nic_board_cfg(
 
 	/* Obtain the default PHY advertised capabilities */
 	if ((rc = ef10_phy_get_link(enp, &els)) != 0)
-		goto fail8;
+		goto fail9;
 	epp->ep_default_adv_cap_mask = els.epls.epls_adv_cap_mask;
 	epp->ep_adv_cap_mask = els.epls.epls_adv_cap_mask;
 
 	/* Check capabilities of running datapath firmware */
 	if ((rc = ef10_get_datapath_caps(enp)) != 0)
-		goto fail9;
+		goto fail10;
 
 	/* Get interrupt vector limits */
 	if ((rc = efx_mcdi_get_vector_cfg(enp, &base, &nvec, NULL)) != 0) {
 		if (EFX_PCI_FUNCTION_IS_PF(encp))
-			goto fail10;
+			goto fail11;
 
 		/* Ignore error (cannot query vector limits from a VF). */
 		base = 0;
@@ -1949,16 +1969,6 @@ efx_mcdi_nic_board_cfg(
 	encp->enc_intr_vec_base = base;
 	encp->enc_intr_limit = nvec;
 
-	/*
-	 * Get the current privilege mask. Note that this may be modified
-	 * dynamically, so this value is informational only. DO NOT use
-	 * the privilege mask to check for sufficient privileges, as that
-	 * can result in time-of-check/time-of-use bugs.
-	 */
-	if ((rc = ef10_get_privilege_mask(enp, &mask)) != 0)
-		goto fail11;
-	encp->enc_privilege_mask = mask;
-
 	return (0);
 
 fail11:
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:31.543744906 +0000
+++ 0050-common-sfc_efx-base-check-for-MAE-privilege.patch	2021-02-05 11:18:28.774690503 +0000
@@ -1 +1 @@
-From be2f2be77ce2ee52cbc15ba4831152974990ac5c Mon Sep 17 00:00:00 2001
+From fd0e7135ccd69adf74aa3486cbdb52d2c3be98e7 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit be2f2be77ce2ee52cbc15ba4831152974990ac5c ]
+
@@ -12 +13,0 @@
-Cc: stable at dpdk.org