[PATCH net-next 06/11] eth: bnxt: depend on core cleaning up RSS contexts

[PATCH net-next 06/11] eth: bnxt: depend on core cleaning up RSS contexts

[Jakub Kicinski]

New RSS context API removes old contexts on netdev unregister.
No need to wipe them manually.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 11 ++++-------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h         |  2 +-
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  2 +-
 3 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 02aeba4b5df5..b6915261c15d 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10259,12 +10259,12 @@ struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp)
 	return rss_ctx;
 }
 
-void bnxt_clear_rss_ctxs(struct bnxt *bp, bool all)
+void bnxt_clear_rss_ctxs(struct bnxt *bp)
 {
 	struct bnxt_rss_ctx *rss_ctx, *tmp;
 
 	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list)
-		bnxt_del_one_rss_ctx(bp, rss_ctx, all);
+		bnxt_del_one_rss_ctx(bp, rss_ctx, false);
 }
 
 static void bnxt_init_multi_rss_ctx(struct bnxt *bp)
@@ -12316,7 +12316,7 @@ static void __bnxt_close_nic(struct bnxt *bp, bool irq_re_init,
 		msleep(20);
 
 	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
-		bnxt_clear_rss_ctxs(bp, false);
+		bnxt_clear_rss_ctxs(bp);
 	/* Flush rings and disable interrupts */
 	bnxt_shutdown_nic(bp, irq_re_init);
 
@@ -15227,8 +15227,7 @@ static void bnxt_remove_one(struct pci_dev *pdev)
 
 	bnxt_free_l2_filters(bp, true);
 	bnxt_free_ntp_fltrs(bp, true);
-	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
-		bnxt_clear_rss_ctxs(bp, true);
+	WARN_ON(bp->num_rss_ctx);
 	clear_bit(BNXT_STATE_IN_FW_RESET, &bp->state);
 	/* Flush any pending tasks */
 	cancel_work_sync(&bp->sp_task);
@@ -15879,8 +15878,6 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	bnxt_clear_int_mode(bp);
 
 init_err_pci_clean:
-	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
-		bnxt_clear_rss_ctxs(bp, true);
 	bnxt_hwrm_func_drv_unrgtr(bp);
 	bnxt_free_hwrm_resources(bp);
 	bnxt_hwmon_uninit(bp);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index f4365a840e3a..04c4ff7b9052 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -2846,7 +2846,7 @@ int __bnxt_setup_vnic_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 			  bool all);
 struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp);
-void bnxt_clear_rss_ctxs(struct bnxt *bp, bool all);
+void bnxt_clear_rss_ctxs(struct bnxt *bp);
 int bnxt_open_nic(struct bnxt *, bool, bool);
 int bnxt_half_open_nic(struct bnxt *bp);
 void bnxt_half_close_nic(struct bnxt *bp);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 48f8e14685a1..397aedad3d4f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -970,7 +970,7 @@ static int bnxt_set_channels(struct net_device *dev,
 
 	bnxt_clear_usr_fltrs(bp, true);
 	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
-		bnxt_clear_rss_ctxs(bp, false);
+		bnxt_clear_rss_ctxs(bp);
 	if (netif_running(dev)) {
 		if (BNXT_PF(bp)) {
 			/* TODO CHIMP_FW: Send message to all VF's
-- 
2.45.2

[PATCH net-next 00/11] eth: bnxt: use the new RSS API

[Jakub Kicinski]

Convert bnxt from using the set_rxfh API to separate create/modify/remove
callbacks.

Two small extensions to the core APIs are necessary:
 - the ability to discard contexts if for some catastrophic reasons
   device can no longer provide them;
 - the ability to reserve space in the context for RSS table growth.

The driver is adjusted to store indirection tables on u32 to make
it easier to use core structs directly.

With that out of the way the conversion is fairly straightforward.

Since the opposition to discarding contexts was relatively mild
and its what bnxt does already, I'm sticking to that. We may very
well need to revisit that at a later time.

v2:
 - move "lost context" helper to common.c to avoid build problems
   when ethtool-nl isn't enabled
 - add a note about the counter proposal in the commit message
 - move key_off to the end, under the private label (hiding from kdoc)
 - remove bnxt_get_max_rss_ctx_ring()
 - switch from sizeof(u32) to sizeof(*indir_tbl)
 - add a sentence to the commit msg
 - store a pointer to struct ethtool_rxfh_param instead of
   adding the ethtool_rxfh_priv_context() helper
v1: https://lore.kernel.org/all/20240702234757.4188344-1-kuba@kernel.org/

Jakub Kicinski (11):
  net: ethtool: let drivers remove lost RSS contexts
  net: ethtool: let drivers declare max size of RSS indir table and key
  eth: bnxt: allow deleting RSS contexts when the device is down
  eth: bnxt: move from .set_rxfh to .create_rxfh_context and friends
  eth: bnxt: remove rss_ctx_bmap
  eth: bnxt: depend on core cleaning up RSS contexts
  eth: bnxt: use context priv for struct bnxt_rss_ctx
  eth: bnxt: use the RSS context XArray instead of the local list
  eth: bnxt: pad out the correct indirection table
  eth: bnxt: bump the entry size in indir tables to u32
  eth: bnxt: use the indir table from ethtool context

 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 126 +++++--------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  17 +-
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 165 ++++++++++--------
 include/linux/ethtool.h                       |  20 +--
 net/ethtool/common.c                          |  14 ++
 net/ethtool/ioctl.c                           |  46 +++--
 6 files changed, 194 insertions(+), 194 deletions(-)

-- 
2.45.2

[PATCH net-next 01/11] net: ethtool: let drivers remove lost RSS contexts

[Jakub Kicinski]

RSS contexts may get lost from a device, in various extreme circumstances.
Specifically if the firmware leaks resources and resets, or crashes and
either recovers in partially working state or the crash causes a
different FW version to run - creating the context again may fail.

Drivers should do their absolute best to prevent this from happening.
When it does, however, telling user that a context exists, when it can't
possibly be used any more is counter productive. Add a helper for
drivers to discard contexts. Print an error, in the future netlink
notification will also be sent.

More robust approaches were proposed, like keeping the contexts
but marking them as "dead" (but possibly resurrected by next reset).
That may be better but it's unclear at this stage whether the
effort is worth the benefits.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
--
I'm keeping this patch as is, since this is the simplest solution,
and nobody has strong opinions.

v2:
 - move to common.c to avoid build problems when ethtool-nl isn't enabled
 - add a note about the counter proposal in the commit message
---
 include/linux/ethtool.h |  2 ++
 net/ethtool/common.c    | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index e213b5508da6..89da0254ccd4 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -210,6 +210,8 @@ static inline size_t ethtool_rxfh_context_size(u32 indir_size, u32 key_size,
 	return struct_size_t(struct ethtool_rxfh_context, data, flex_len);
 }
 
+void ethtool_rxfh_context_lost(struct net_device *dev, u32 context_id);
+
 /* declare a link mode bitmap */
 #define __ETHTOOL_DECLARE_LINK_MODE_MASK(name)		\
 	DECLARE_BITMAP(name, __ETHTOOL_LINK_MODE_MASK_NBITS)
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 7bda9600efcf..67d06cd002a5 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -741,3 +741,17 @@ ethtool_forced_speed_maps_init(struct ethtool_forced_speed_map *maps, u32 size)
 	}
 }
 EXPORT_SYMBOL_GPL(ethtool_forced_speed_maps_init);
+
+void ethtool_rxfh_context_lost(struct net_device *dev, u32 context_id)
+{
+	struct ethtool_rxfh_context *ctx;
+
+	WARN_ONCE(!rtnl_is_locked() &&
+		  !lockdep_is_held_type(&dev->ethtool->rss_lock, -1),
+		  "RSS context lock assertion failed\n");
+
+	netdev_err(dev, "device error, RSS context %d lost\n", context_id);
+	ctx = xa_erase(&dev->ethtool->rss_ctx, context_id);
+	kfree(ctx);
+}
+EXPORT_SYMBOL(ethtool_rxfh_context_lost);
-- 
2.45.2

[PATCH net-next 02/11] net: ethtool: let drivers declare max size of RSS indir table and key

[Jakub Kicinski]

Some drivers (bnxt but I think also mlx5 from ML discussions) change
the size of the indirection table depending on the number of Rx rings.
Decouple the max table size from the size of the currently used table,
so that we can reserve space in the context for table growth.

Static members in ethtool_ops are good enough for now, we can add
callbacks to read the max size more dynamically if someone needs
that.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
--
v2:
 - move key_off to the end, under the private label (hiding from kdoc)
---
 include/linux/ethtool.h | 20 +++++++-----------
 net/ethtool/ioctl.c     | 46 ++++++++++++++++++++++++++++++++---------
 2 files changed, 44 insertions(+), 22 deletions(-)

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 89da0254ccd4..a1ee76936f53 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -181,6 +181,7 @@ struct ethtool_rxfh_context {
 	/* private: driver private data, indirection table, and hash key are
 	 * stored sequentially in @data area.  Use below helpers to access.
 	 */
+	u32 key_off;
 	u8 data[] __aligned(sizeof(void *));
 };
 
@@ -196,18 +197,7 @@ static inline u32 *ethtool_rxfh_context_indir(struct ethtool_rxfh_context *ctx)
 
 static inline u8 *ethtool_rxfh_context_key(struct ethtool_rxfh_context *ctx)
 {
-	return (u8 *)(ethtool_rxfh_context_indir(ctx) + ctx->indir_size);
-}
-
-static inline size_t ethtool_rxfh_context_size(u32 indir_size, u32 key_size,
-					       u16 priv_size)
-{
-	size_t indir_bytes = array_size(indir_size, sizeof(u32));
-	size_t flex_len;
-
-	flex_len = size_add(size_add(indir_bytes, key_size),
-			    ALIGN(priv_size, sizeof(u32)));
-	return struct_size_t(struct ethtool_rxfh_context, data, flex_len);
+	return &ctx->data[ctx->key_off];
 }
 
 void ethtool_rxfh_context_lost(struct net_device *dev, u32 context_id);
@@ -723,6 +713,10 @@ struct ethtool_rxfh_param {
  *	contexts.
  * @cap_rss_sym_xor_supported: indicates if the driver supports symmetric-xor
  *	RSS.
+ * @rxfh_indir_space: max size of RSS indirection tables, if indirection table
+ *	size as returned by @get_rxfh_indir_size may change during lifetime
+ *	of the device. Leave as 0 if the table size is constant.
+ * @rxfh_key_space: same as @rxfh_indir_space, but for the key.
  * @rxfh_priv_size: size of the driver private data area the core should
  *	allocate for an RSS context (in &struct ethtool_rxfh_context).
  * @rxfh_max_context_id: maximum (exclusive) supported RSS context ID.  If this
@@ -940,6 +934,8 @@ struct ethtool_ops {
 	u32     cap_link_lanes_supported:1;
 	u32     cap_rss_ctx_supported:1;
 	u32	cap_rss_sym_xor_supported:1;
+	u32	rxfh_indir_space;
+	u16	rxfh_key_space;
 	u16	rxfh_priv_size;
 	u32	rxfh_max_context_id;
 	u32	supported_coalesce_params;
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 615812ff8974..0732710a4836 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1290,6 +1290,40 @@ static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
 	return ret;
 }
 
+static struct ethtool_rxfh_context *
+ethtool_rxfh_ctx_alloc(const struct ethtool_ops *ops,
+		       u32 indir_size, u32 key_size)
+{
+	size_t indir_bytes, flex_len, key_off, size;
+	struct ethtool_rxfh_context *ctx;
+	u32 priv_bytes, indir_max;
+	u16 key_max;
+
+	key_max = max(key_size, ops->rxfh_key_space);
+	indir_max = max(indir_size, ops->rxfh_indir_space);
+
+	priv_bytes = ALIGN(ops->rxfh_priv_size, sizeof(u32));
+	indir_bytes = array_size(indir_max, sizeof(u32));
+
+	key_off = size_add(priv_bytes, indir_bytes);
+	flex_len = size_add(key_off, key_max);
+	size = struct_size_t(struct ethtool_rxfh_context, data, flex_len);
+
+	ctx = kzalloc(size, GFP_KERNEL_ACCOUNT);
+	if (!ctx)
+		return NULL;
+
+	ctx->indir_size = indir_size;
+	ctx->key_size = key_size;
+	ctx->key_off = key_off;
+	ctx->priv_size = ops->rxfh_priv_size;
+
+	ctx->hfunc = ETH_RSS_HASH_NO_CHANGE;
+	ctx->input_xfrm = RXH_XFRM_NO_CHANGE;
+
+	return ctx;
+}
+
 static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
 					       void __user *useraddr)
 {
@@ -1406,20 +1440,12 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
 			ret = -EINVAL;
 			goto out;
 		}
-		ctx = kzalloc(ethtool_rxfh_context_size(dev_indir_size,
-							dev_key_size,
-							ops->rxfh_priv_size),
-			      GFP_KERNEL_ACCOUNT);
+		ctx = ethtool_rxfh_ctx_alloc(ops, dev_indir_size, dev_key_size);
 		if (!ctx) {
 			ret = -ENOMEM;
 			goto out;
 		}
-		ctx->indir_size = dev_indir_size;
-		ctx->key_size = dev_key_size;
-		ctx->priv_size = ops->rxfh_priv_size;
-		/* Initialise to an empty context */
-		ctx->hfunc = ETH_RSS_HASH_NO_CHANGE;
-		ctx->input_xfrm = RXH_XFRM_NO_CHANGE;
+
 		if (ops->create_rxfh_context) {
 			u32 limit = ops->rxfh_max_context_id ?: U32_MAX;
 			u32 ctx_id;
-- 
2.45.2

[PATCH net-next 03/11] eth: bnxt: allow deleting RSS contexts when the device is down

[Jakub Kicinski]

Contexts get deleted from FW when the device is down, but they
are kept in SW and re-added back on open. bnxt_set_rxfh_context()
apparently does not want to deal with complexity of dealing with
both the device down and device up cases. This is perhaps acceptable
for creating new contexts, but not being able to delete contexts
makes core-driven cleanups messy. Specifically with the new RSS
API core will try to delete contexts automatically after bringing
the device down.

Support the delete-while-down case. Skip the FW logic and delete
just the driver state.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 10 ++++++----
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  6 ++++--
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 80fce0aaad66..e8965cf743fc 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10210,10 +10210,12 @@ void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 	struct bnxt_ntuple_filter *ntp_fltr;
 	int i;
 
-	bnxt_hwrm_vnic_free_one(bp, &rss_ctx->vnic);
-	for (i = 0; i < BNXT_MAX_CTX_PER_VNIC; i++) {
-		if (vnic->fw_rss_cos_lb_ctx[i] != INVALID_HW_RING_ID)
-			bnxt_hwrm_vnic_ctx_free_one(bp, vnic, i);
+	if (netif_running(bp->dev)) {
+		bnxt_hwrm_vnic_free_one(bp, &rss_ctx->vnic);
+		for (i = 0; i < BNXT_MAX_CTX_PER_VNIC; i++) {
+			if (vnic->fw_rss_cos_lb_ctx[i] != INVALID_HW_RING_ID)
+				bnxt_hwrm_vnic_ctx_free_one(bp, vnic, i);
+		}
 	}
 	if (!all)
 		return;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 4d53ec7adc61..846a19b5f58d 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1874,6 +1874,7 @@ static int bnxt_set_rxfh_context(struct bnxt *bp,
 	struct bnxt_rss_ctx *rss_ctx;
 	struct bnxt_vnic_info *vnic;
 	bool modify = false;
+	bool delete;
 	int bit_id;
 	int rc;
 
@@ -1882,7 +1883,8 @@ static int bnxt_set_rxfh_context(struct bnxt *bp,
 		return -EOPNOTSUPP;
 	}
 
-	if (!netif_running(bp->dev)) {
+	delete = *rss_context != ETH_RXFH_CONTEXT_ALLOC && rxfh->rss_delete;
+	if (!netif_running(bp->dev) && !delete) {
 		NL_SET_ERR_MSG_MOD(extack, "Unable to set RSS contexts when interface is down");
 		return -EAGAIN;
 	}
@@ -1894,7 +1896,7 @@ static int bnxt_set_rxfh_context(struct bnxt *bp,
 					       *rss_context);
 			return -EINVAL;
 		}
-		if (*rss_context && rxfh->rss_delete) {
+		if (delete) {
 			bnxt_del_one_rss_ctx(bp, rss_ctx, true);
 			return 0;
 		}
-- 
2.45.2

[PATCH net-next 04/11] eth: bnxt: move from .set_rxfh to .create_rxfh_context and friends

[Jakub Kicinski]

Use the new ethtool ops for RSS context management. The conversion
is pretty straightforward cut / paste of the right chunks of the
combined handler. Main change is that we let the core pick the IDs
(bitmap will be removed separately for ease of review), so we need
to tell the core when we lose a context.
Since the new API passes rxfh as const, change bnxt_modify_rss()
to also take const.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     |   1 +
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 119 +++++++++++-------
 2 files changed, 75 insertions(+), 45 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index e8965cf743fc..bd087c85af5c 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10257,6 +10257,7 @@ static void bnxt_hwrm_realloc_rss_ctx_vnic(struct bnxt *bp)
 			netdev_err(bp->dev, "Failed to restore RSS ctx %d\n",
 				   rss_ctx->index);
 			bnxt_del_one_rss_ctx(bp, rss_ctx, true);
+			ethtool_rxfh_context_lost(bp->dev, rss_ctx->index);
 		}
 	}
 }
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 846a19b5f58d..afbb7546ee14 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1841,7 +1841,7 @@ static int bnxt_get_rxfh(struct net_device *dev,
 }
 
 static void bnxt_modify_rss(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
-			    struct ethtool_rxfh_param *rxfh)
+			    const struct ethtool_rxfh_param *rxfh)
 {
 	if (rxfh->key) {
 		if (rss_ctx) {
@@ -1866,44 +1866,35 @@ static void bnxt_modify_rss(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 	}
 }
 
-static int bnxt_set_rxfh_context(struct bnxt *bp,
-				 struct ethtool_rxfh_param *rxfh,
-				 struct netlink_ext_ack *extack)
+static int bnxt_rxfh_context_check(struct bnxt *bp,
+				   struct netlink_ext_ack *extack)
 {
-	u32 *rss_context = &rxfh->rss_context;
-	struct bnxt_rss_ctx *rss_ctx;
-	struct bnxt_vnic_info *vnic;
-	bool modify = false;
-	bool delete;
-	int bit_id;
-	int rc;
-
 	if (!BNXT_SUPPORTS_MULTI_RSS_CTX(bp)) {
 		NL_SET_ERR_MSG_MOD(extack, "RSS contexts not supported");
 		return -EOPNOTSUPP;
 	}
 
-	delete = *rss_context != ETH_RXFH_CONTEXT_ALLOC && rxfh->rss_delete;
-	if (!netif_running(bp->dev) && !delete) {
+	if (!netif_running(bp->dev)) {
 		NL_SET_ERR_MSG_MOD(extack, "Unable to set RSS contexts when interface is down");
 		return -EAGAIN;
 	}
 
-	if (*rss_context != ETH_RXFH_CONTEXT_ALLOC) {
-		rss_ctx = bnxt_get_rss_ctx_from_index(bp, *rss_context);
-		if (!rss_ctx) {
-			NL_SET_ERR_MSG_FMT_MOD(extack, "RSS context %u not found",
-					       *rss_context);
-			return -EINVAL;
-		}
-		if (delete) {
-			bnxt_del_one_rss_ctx(bp, rss_ctx, true);
-			return 0;
-		}
-		modify = true;
-		vnic = &rss_ctx->vnic;
-		goto modify_context;
-	}
+	return 0;
+}
+
+static int bnxt_create_rxfh_context(struct net_device *dev,
+				    struct ethtool_rxfh_context *ctx,
+				    const struct ethtool_rxfh_param *rxfh,
+				    struct netlink_ext_ack *extack)
+{
+	struct bnxt *bp = netdev_priv(dev);
+	struct bnxt_rss_ctx *rss_ctx;
+	struct bnxt_vnic_info *vnic;
+	int rc;
+
+	rc = bnxt_rxfh_context_check(bp, extack);
+	if (rc)
+		return rc;
 
 	if (bp->num_rss_ctx >= BNXT_MAX_ETH_RSS_CTX) {
 		NL_SET_ERR_MSG_FMT_MOD(extack, "Out of RSS contexts, maximum %u",
@@ -1911,6 +1902,11 @@ static int bnxt_set_rxfh_context(struct bnxt *bp,
 		return -EINVAL;
 	}
 
+	if (test_and_set_bit(rxfh->rss_context, bp->rss_ctx_bmap)) {
+		NL_SET_ERR_MSG_MOD(extack, "Context ID conflict");
+		return -EINVAL;
+	}
+
 	if (!bnxt_rfs_capable(bp, true)) {
 		NL_SET_ERR_MSG_MOD(extack, "Out hardware resources");
 		return -ENOMEM;
@@ -1945,33 +1941,65 @@ static int bnxt_set_rxfh_context(struct bnxt *bp,
 		NL_SET_ERR_MSG_MOD(extack, "Unable to setup TPA");
 		goto out;
 	}
-modify_context:
 	bnxt_modify_rss(bp, rss_ctx, rxfh);
 
-	if (modify)
-		return bnxt_hwrm_vnic_rss_cfg_p5(bp, vnic);
-
 	rc = __bnxt_setup_vnic_p5(bp, vnic);
 	if (rc) {
 		NL_SET_ERR_MSG_MOD(extack, "Unable to setup TPA");
 		goto out;
 	}
 
-	bit_id = bitmap_find_free_region(bp->rss_ctx_bmap,
-					 BNXT_RSS_CTX_BMAP_LEN, 0);
-	if (bit_id < 0) {
-		rc = -ENOMEM;
-		goto out;
-	}
-	rss_ctx->index = (u16)bit_id;
-	*rss_context = rss_ctx->index;
-
+	rss_ctx->index = rxfh->rss_context;
 	return 0;
 out:
 	bnxt_del_one_rss_ctx(bp, rss_ctx, true);
 	return rc;
 }
 
+static int bnxt_modify_rxfh_context(struct net_device *dev,
+				    struct ethtool_rxfh_context *ctx,
+				    const struct ethtool_rxfh_param *rxfh,
+				    struct netlink_ext_ack *extack)
+{
+	struct bnxt *bp = netdev_priv(dev);
+	struct bnxt_rss_ctx *rss_ctx;
+	int rc;
+
+	rc = bnxt_rxfh_context_check(bp, extack);
+	if (rc)
+		return rc;
+
+	rss_ctx = bnxt_get_rss_ctx_from_index(bp, rxfh->rss_context);
+	if (!rss_ctx) {
+		NL_SET_ERR_MSG_FMT_MOD(extack, "RSS context %u not found",
+				       rxfh->rss_context);
+		return -EINVAL;
+	}
+
+	bnxt_modify_rss(bp, rss_ctx, rxfh);
+
+	return bnxt_hwrm_vnic_rss_cfg_p5(bp, &rss_ctx->vnic);
+}
+
+static int bnxt_remove_rxfh_context(struct net_device *dev,
+				    struct ethtool_rxfh_context *ctx,
+				    u32 rss_context,
+				    struct netlink_ext_ack *extack)
+{
+	struct bnxt *bp = netdev_priv(dev);
+	struct bnxt_rss_ctx *rss_ctx;
+
+	rss_ctx = bnxt_get_rss_ctx_from_index(bp, rss_context);
+	if (!rss_ctx) {
+		NL_SET_ERR_MSG_FMT_MOD(extack, "RSS context %u not found",
+				       rss_context);
+		return -EINVAL;
+	}
+
+	bnxt_del_one_rss_ctx(bp, rss_ctx, true);
+	return 0;
+}
+
 static int bnxt_set_rxfh(struct net_device *dev,
 			 struct ethtool_rxfh_param *rxfh,
 			 struct netlink_ext_ack *extack)
@@ -1982,9 +2010,6 @@ static int bnxt_set_rxfh(struct net_device *dev,
 	if (rxfh->hfunc && rxfh->hfunc != ETH_RSS_HASH_TOP)
 		return -EOPNOTSUPP;
 
-	if (rxfh->rss_context)
-		return bnxt_set_rxfh_context(bp, rxfh, extack);
-
 	bnxt_modify_rss(bp, NULL, rxfh);
 
 	bnxt_clear_usr_fltrs(bp, false);
@@ -5277,6 +5302,7 @@ void bnxt_ethtool_free(struct bnxt *bp)
 const struct ethtool_ops bnxt_ethtool_ops = {
 	.cap_link_lanes_supported	= 1,
 	.cap_rss_ctx_supported		= 1,
+	.rxfh_max_context_id		= BNXT_MAX_ETH_RSS_CTX,
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES |
 				     ETHTOOL_COALESCE_USECS_IRQ |
@@ -5314,6 +5340,9 @@ const struct ethtool_ops bnxt_ethtool_ops = {
 	.get_rxfh_key_size      = bnxt_get_rxfh_key_size,
 	.get_rxfh               = bnxt_get_rxfh,
 	.set_rxfh		= bnxt_set_rxfh,
+	.create_rxfh_context	= bnxt_create_rxfh_context,
+	.modify_rxfh_context	= bnxt_modify_rxfh_context,
+	.remove_rxfh_context	= bnxt_remove_rxfh_context,
 	.flash_device		= bnxt_flash_device,
 	.get_eeprom_len         = bnxt_get_eeprom_len,
 	.get_eeprom             = bnxt_get_eeprom,
-- 
2.45.2

[PATCH net-next 05/11] eth: bnxt: remove rss_ctx_bmap

[Jakub Kicinski]

Core will allocate IDs for the driver, from the range
[1, BNXT_MAX_ETH_RSS_CTX], no need to track the allocations.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 13 ++-----------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h         |  2 --
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  5 -----
 3 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index bd087c85af5c..026ceaa0b329 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10239,7 +10239,6 @@ void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 	kfree(rss_ctx->rss_indir_tbl);
 	list_del(&rss_ctx->list);
 	bp->num_rss_ctx--;
-	clear_bit(rss_ctx->index, bp->rss_ctx_bmap);
 	kfree(rss_ctx);
 }
 
@@ -10281,20 +10280,12 @@ void bnxt_clear_rss_ctxs(struct bnxt *bp, bool all)
 
 	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list)
 		bnxt_del_one_rss_ctx(bp, rss_ctx, all);
-
-	if (all)
-		bitmap_free(bp->rss_ctx_bmap);
 }
 
 static void bnxt_init_multi_rss_ctx(struct bnxt *bp)
 {
-	bp->rss_ctx_bmap = bitmap_zalloc(BNXT_RSS_CTX_BMAP_LEN, GFP_KERNEL);
-	if (bp->rss_ctx_bmap) {
-		/* burn index 0 since we cannot have context 0 */
-		__set_bit(0, bp->rss_ctx_bmap);
-		INIT_LIST_HEAD(&bp->rss_ctx_list);
-		bp->rss_cap |= BNXT_RSS_CAP_MULTI_RSS_CTX;
-	}
+	INIT_LIST_HEAD(&bp->rss_ctx_list);
+	bp->rss_cap |= BNXT_RSS_CAP_MULTI_RSS_CTX;
 }
 
 /* Allow PF, trusted VFs and VFs with default VLAN to be in promiscuous mode */
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 3c8826875ceb..9b0c6656ce27 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1298,7 +1298,6 @@ struct bnxt_rss_ctx {
 };
 
 #define BNXT_MAX_ETH_RSS_CTX	32
-#define BNXT_RSS_CTX_BMAP_LEN	(BNXT_MAX_ETH_RSS_CTX + 1)
 #define BNXT_VNIC_ID_INVALID	0xffffffff
 
 struct bnxt_hw_rings {
@@ -2332,7 +2331,6 @@ struct bnxt {
 	struct bnxt_ring_grp_info	*grp_info;
 	struct bnxt_vnic_info	*vnic_info;
 	struct list_head	rss_ctx_list;
-	unsigned long		*rss_ctx_bmap;
 	u32			num_rss_ctx;
 	int			nr_vnics;
 	u16			*rss_indir_tbl;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index afbb7546ee14..04855846b5f6 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1902,11 +1902,6 @@ static int bnxt_create_rxfh_context(struct net_device *dev,
 		return -EINVAL;
 	}
 
-	if (test_and_set_bit(rxfh->rss_context, bp->rss_ctx_bmap)) {
-		NL_SET_ERR_MSG_MOD(extack, "Context ID conflict");
-		return -EINVAL;
-	}
-
 	if (!bnxt_rfs_capable(bp, true)) {
 		NL_SET_ERR_MSG_MOD(extack, "Out hardware resources");
 		return -ENOMEM;
-- 
2.45.2

[PATCH net-next 06/11] eth: bnxt: depend on core cleaning up RSS contexts

[Jakub Kicinski]

New RSS context API removes old contexts on netdev unregister.
No need to wipe them manually.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 11 ++++-------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h         |  2 +-
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  2 +-
 3 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 026ceaa0b329..d6a4ce5066c6 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10274,12 +10274,12 @@ struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp)
 	return rss_ctx;
 }
 
-void bnxt_clear_rss_ctxs(struct bnxt *bp, bool all)
+void bnxt_clear_rss_ctxs(struct bnxt *bp)
 {
 	struct bnxt_rss_ctx *rss_ctx, *tmp;
 
 	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list)
-		bnxt_del_one_rss_ctx(bp, rss_ctx, all);
+		bnxt_del_one_rss_ctx(bp, rss_ctx, false);
 }
 
 static void bnxt_init_multi_rss_ctx(struct bnxt *bp)
@@ -12331,7 +12331,7 @@ static void __bnxt_close_nic(struct bnxt *bp, bool irq_re_init,
 		msleep(20);
 
 	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
-		bnxt_clear_rss_ctxs(bp, false);
+		bnxt_clear_rss_ctxs(bp);
 	/* Flush rings and disable interrupts */
 	bnxt_shutdown_nic(bp, irq_re_init);
 
@@ -15246,8 +15246,7 @@ static void bnxt_remove_one(struct pci_dev *pdev)
 
 	bnxt_free_l2_filters(bp, true);
 	bnxt_free_ntp_fltrs(bp, true);
-	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
-		bnxt_clear_rss_ctxs(bp, true);
+	WARN_ON(bp->num_rss_ctx);
 	clear_bit(BNXT_STATE_IN_FW_RESET, &bp->state);
 	/* Flush any pending tasks */
 	cancel_work_sync(&bp->sp_task);
@@ -15898,8 +15897,6 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	bnxt_clear_int_mode(bp);
 
 init_err_pci_clean:
-	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
-		bnxt_clear_rss_ctxs(bp, true);
 	bnxt_hwrm_func_drv_unrgtr(bp);
 	bnxt_free_hwrm_resources(bp);
 	bnxt_hwmon_uninit(bp);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 9b0c6656ce27..df96524a8b8b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -2847,7 +2847,7 @@ int __bnxt_setup_vnic_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 			  bool all);
 struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp);
-void bnxt_clear_rss_ctxs(struct bnxt *bp, bool all);
+void bnxt_clear_rss_ctxs(struct bnxt *bp);
 int bnxt_open_nic(struct bnxt *, bool, bool);
 int bnxt_half_open_nic(struct bnxt *bp);
 void bnxt_half_close_nic(struct bnxt *bp);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 04855846b5f6..5a64c0ea56c0 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -976,7 +976,7 @@ static int bnxt_set_channels(struct net_device *dev,
 
 	bnxt_clear_usr_fltrs(bp, true);
 	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
-		bnxt_clear_rss_ctxs(bp, false);
+		bnxt_clear_rss_ctxs(bp);
 	if (netif_running(dev)) {
 		if (BNXT_PF(bp)) {
 			/* TODO CHIMP_FW: Send message to all VF's
-- 
2.45.2

[PATCH net-next 07/11] eth: bnxt: use context priv for struct bnxt_rss_ctx

[Jakub Kicinski]

Core can allocate space for per-context driver-private data,
use it for struct bnxt_rss_ctx. Inline bnxt_alloc_rss_ctx()
at this point, most of the init (as in the actions bnxt_del_one_rss_ctx()
will undo) is open coded in bnxt_create_rxfh_context(), anyway.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 14 -----------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  1 -
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 24 +++++++------------
 3 files changed, 9 insertions(+), 30 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index d6a4ce5066c6..e3cc34712f33 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10239,7 +10239,6 @@ void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 	kfree(rss_ctx->rss_indir_tbl);
 	list_del(&rss_ctx->list);
 	bp->num_rss_ctx--;
-	kfree(rss_ctx);
 }
 
 static void bnxt_hwrm_realloc_rss_ctx_vnic(struct bnxt *bp)
@@ -10261,19 +10260,6 @@ static void bnxt_hwrm_realloc_rss_ctx_vnic(struct bnxt *bp)
 	}
 }
 
-struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp)
-{
-	struct bnxt_rss_ctx *rss_ctx = NULL;
-
-	rss_ctx = kzalloc(sizeof(*rss_ctx), GFP_KERNEL);
-	if (rss_ctx) {
-		rss_ctx->vnic.rss_ctx = rss_ctx;
-		list_add_tail(&rss_ctx->list, &bp->rss_ctx_list);
-		bp->num_rss_ctx++;
-	}
-	return rss_ctx;
-}
-
 void bnxt_clear_rss_ctxs(struct bnxt *bp)
 {
 	struct bnxt_rss_ctx *rss_ctx, *tmp;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index df96524a8b8b..c5fd7a4e6681 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -2846,7 +2846,6 @@ int bnxt_hwrm_vnic_rss_cfg_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 int __bnxt_setup_vnic_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 			  bool all);
-struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp);
 void bnxt_clear_rss_ctxs(struct bnxt *bp);
 int bnxt_open_nic(struct bnxt *, bool, bool);
 int bnxt_half_open_nic(struct bnxt *bp);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 5a64c0ea56c0..de8e13412151 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1907,11 +1907,13 @@ static int bnxt_create_rxfh_context(struct net_device *dev,
 		return -ENOMEM;
 	}
 
-	rss_ctx = bnxt_alloc_rss_ctx(bp);
-	if (!rss_ctx)
-		return -ENOMEM;
+	rss_ctx = ethtool_rxfh_context_priv(ctx);
+
+	list_add_tail(&rss_ctx->list, &bp->rss_ctx_list);
+	bp->num_rss_ctx++;
 
 	vnic = &rss_ctx->vnic;
+	vnic->rss_ctx = rss_ctx;
 	vnic->flags |= BNXT_VNIC_RSSCTX_FLAG;
 	vnic->vnic_id = BNXT_VNIC_ID_INVALID;
 	rc = bnxt_alloc_rss_ctx_rss_table(bp, rss_ctx);
@@ -1964,12 +1966,7 @@ static int bnxt_modify_rxfh_context(struct net_device *dev,
 	if (rc)
 		return rc;
 
-	rss_ctx = bnxt_get_rss_ctx_from_index(bp, rxfh->rss_context);
-	if (!rss_ctx) {
-		NL_SET_ERR_MSG_FMT_MOD(extack, "RSS context %u not found",
-				       rxfh->rss_context);
-		return -EINVAL;
-	}
+	rss_ctx = ethtool_rxfh_context_priv(ctx);
 
 	bnxt_modify_rss(bp, rss_ctx, rxfh);
 
@@ -1984,12 +1981,7 @@ static int bnxt_remove_rxfh_context(struct net_device *dev,
 	struct bnxt *bp = netdev_priv(dev);
 	struct bnxt_rss_ctx *rss_ctx;
 
-	rss_ctx = bnxt_get_rss_ctx_from_index(bp, rss_context);
-	if (!rss_ctx) {
-		NL_SET_ERR_MSG_FMT_MOD(extack, "RSS context %u not found",
-				       rss_context);
-		return -EINVAL;
-	}
+	rss_ctx = ethtool_rxfh_context_priv(ctx);
 
 	bnxt_del_one_rss_ctx(bp, rss_ctx, true);
 	return 0;
@@ -5298,6 +5290,8 @@ const struct ethtool_ops bnxt_ethtool_ops = {
 	.cap_link_lanes_supported	= 1,
 	.cap_rss_ctx_supported		= 1,
 	.rxfh_max_context_id		= BNXT_MAX_ETH_RSS_CTX,
+	.rxfh_indir_space		= BNXT_MAX_RSS_TABLE_ENTRIES_P5,
+	.rxfh_priv_size			= sizeof(struct bnxt_rss_ctx),
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES |
 				     ETHTOOL_COALESCE_USECS_IRQ |
-- 
2.45.2

[PATCH net-next 08/11] eth: bnxt: use the RSS context XArray instead of the local list

[Jakub Kicinski]

Core already maintains all RSS contexts in an XArray, no need
to keep a second list in the driver.

Remove bnxt_get_max_rss_ctx_ring() completely since core performs
the same check already.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
v2:
 - remove bnxt_get_max_rss_ctx_ring()
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 56 +++++++------------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  3 -
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 17 ++----
 3 files changed, 26 insertions(+), 50 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index e3cc34712f33..f9554f512314 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -5970,17 +5970,20 @@ bnxt_cfg_rfs_ring_tbl_idx(struct bnxt *bp,
 			  struct hwrm_cfa_ntuple_filter_alloc_input *req,
 			  struct bnxt_ntuple_filter *fltr)
 {
-	struct bnxt_rss_ctx *rss_ctx, *tmp;
 	u16 rxq = fltr->base.rxq;
 
 	if (fltr->base.flags & BNXT_ACT_RSS_CTX) {
-		list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list) {
-			if (rss_ctx->index == fltr->base.fw_vnic_id) {
-				struct bnxt_vnic_info *vnic = &rss_ctx->vnic;
+		struct ethtool_rxfh_context *ctx;
+		struct bnxt_rss_ctx *rss_ctx;
+		struct bnxt_vnic_info *vnic;
 
-				req->dst_id = cpu_to_le16(vnic->fw_vnic_id);
-				break;
-			}
+		ctx = xa_load(&bp->dev->ethtool->rss_ctx,
+			      fltr->base.fw_vnic_id);
+		if (ctx) {
+			rss_ctx = ethtool_rxfh_context_priv(ctx);
+			vnic = &rss_ctx->vnic;
+
+			req->dst_id = cpu_to_le16(vnic->fw_vnic_id);
 		}
 		return;
 	}
@@ -6282,21 +6285,6 @@ static u16 bnxt_get_max_rss_ring(struct bnxt *bp)
 	return max_ring;
 }
 
-u16 bnxt_get_max_rss_ctx_ring(struct bnxt *bp)
-{
-	u16 i, tbl_size, max_ring = 0;
-	struct bnxt_rss_ctx *rss_ctx;
-
-	tbl_size = bnxt_get_rxfh_indir_size(bp->dev);
-
-	list_for_each_entry(rss_ctx, &bp->rss_ctx_list, list) {
-		for (i = 0; i < tbl_size; i++)
-			max_ring = max(max_ring, rss_ctx->rss_indir_tbl[i]);
-	}
-
-	return max_ring;
-}
-
 int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings)
 {
 	if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) {
@@ -10237,16 +10225,17 @@ void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 				  vnic->rss_table,
 				  vnic->rss_table_dma_addr);
 	kfree(rss_ctx->rss_indir_tbl);
-	list_del(&rss_ctx->list);
 	bp->num_rss_ctx--;
 }
 
 static void bnxt_hwrm_realloc_rss_ctx_vnic(struct bnxt *bp)
 {
 	bool set_tpa = !!(bp->flags & BNXT_FLAG_TPA);
-	struct bnxt_rss_ctx *rss_ctx, *tmp;
+	struct ethtool_rxfh_context *ctx;
+	unsigned long context;
 
-	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list) {
+	xa_for_each(&bp->dev->ethtool->rss_ctx, context, ctx) {
+		struct bnxt_rss_ctx *rss_ctx = ethtool_rxfh_context_priv(ctx);
 		struct bnxt_vnic_info *vnic = &rss_ctx->vnic;
 
 		if (bnxt_hwrm_vnic_alloc(bp, vnic, 0, bp->rx_nr_rings) ||
@@ -10262,16 +10251,14 @@ static void bnxt_hwrm_realloc_rss_ctx_vnic(struct bnxt *bp)
 
 void bnxt_clear_rss_ctxs(struct bnxt *bp)
 {
-	struct bnxt_rss_ctx *rss_ctx, *tmp;
+	struct ethtool_rxfh_context *ctx;
+	unsigned long context;
+
+	xa_for_each(&bp->dev->ethtool->rss_ctx, context, ctx) {
+		struct bnxt_rss_ctx *rss_ctx = ethtool_rxfh_context_priv(ctx);
 
-	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list)
 		bnxt_del_one_rss_ctx(bp, rss_ctx, false);
-}
-
-static void bnxt_init_multi_rss_ctx(struct bnxt *bp)
-{
-	INIT_LIST_HEAD(&bp->rss_ctx_list);
-	bp->rss_cap |= BNXT_RSS_CAP_MULTI_RSS_CTX;
+	}
 }
 
 /* Allow PF, trusted VFs and VFs with default VLAN to be in promiscuous mode */
@@ -15859,8 +15846,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	INIT_LIST_HEAD(&bp->usr_fltr_list);
 
 	if (BNXT_SUPPORTS_NTUPLE_VNIC(bp))
-		bnxt_init_multi_rss_ctx(bp);
-
+		bp->rss_cap |= BNXT_RSS_CAP_MULTI_RSS_CTX;
 
 	rc = register_netdev(dev);
 	if (rc)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index c5fd7a4e6681..be40e0513777 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1291,7 +1291,6 @@ struct bnxt_vnic_info {
 };
 
 struct bnxt_rss_ctx {
-	struct list_head list;
 	struct bnxt_vnic_info vnic;
 	u16	*rss_indir_tbl;
 	u8	index;
@@ -2330,7 +2329,6 @@ struct bnxt {
 	/* grp_info indexed by completion ring index */
 	struct bnxt_ring_grp_info	*grp_info;
 	struct bnxt_vnic_info	*vnic_info;
-	struct list_head	rss_ctx_list;
 	u32			num_rss_ctx;
 	int			nr_vnics;
 	u16			*rss_indir_tbl;
@@ -2812,7 +2810,6 @@ int bnxt_hwrm_vnic_set_tpa(struct bnxt *bp, struct bnxt_vnic_info *vnic,
 void bnxt_fill_ipv6_mask(__be32 mask[4]);
 int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx);
 void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx);
-u16 bnxt_get_max_rss_ctx_ring(struct bnxt *bp);
 int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings);
 int bnxt_hwrm_vnic_cfg(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 int bnxt_hwrm_vnic_alloc(struct bnxt *bp, struct bnxt_vnic_info *vnic,
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index de8e13412151..74765583405b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -961,12 +961,6 @@ static int bnxt_set_channels(struct net_device *dev,
 		return rc;
 	}
 
-	if (req_rx_rings < bp->rx_nr_rings &&
-	    req_rx_rings <= bnxt_get_max_rss_ctx_ring(bp)) {
-		netdev_warn(dev, "Can't deactivate rings used by RSS contexts\n");
-		return -EINVAL;
-	}
-
 	if (bnxt_get_nr_rss_ctxs(bp, req_rx_rings) !=
 	    bnxt_get_nr_rss_ctxs(bp, bp->rx_nr_rings) &&
 	    netif_is_rxfh_configured(dev)) {
@@ -1216,12 +1210,12 @@ static int bnxt_grxclsrule(struct bnxt *bp, struct ethtool_rxnfc *cmd)
 static struct bnxt_rss_ctx *bnxt_get_rss_ctx_from_index(struct bnxt *bp,
 							u32 index)
 {
-	struct bnxt_rss_ctx *rss_ctx, *tmp;
+	struct ethtool_rxfh_context *ctx;
 
-	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list)
-		if (rss_ctx->index == index)
-			return rss_ctx;
-	return NULL;
+	ctx = xa_load(&bp->dev->ethtool->rss_ctx, index);
+	if (!ctx)
+		return NULL;
+	return ethtool_rxfh_context_priv(ctx);
 }
 
 static int bnxt_alloc_rss_ctx_rss_table(struct bnxt *bp,
@@ -1909,7 +1903,6 @@ static int bnxt_create_rxfh_context(struct net_device *dev,
 
 	rss_ctx = ethtool_rxfh_context_priv(ctx);
 
-	list_add_tail(&rss_ctx->list, &bp->rss_ctx_list);
 	bp->num_rss_ctx++;
 
 	vnic = &rss_ctx->vnic;
-- 
2.45.2

[PATCH net-next 09/11] eth: bnxt: pad out the correct indirection table

[Jakub Kicinski]

bnxt allocates tables of max size, and changes the used size
based on number of active rings. The unused entries get padded
out with zeros. bnxt_modify_rss() seems to always pad out
the table of the main / default RSS context, instead of
the table of the modified context.

I haven't observed any behavior change due to this patch,
so I don't think it's a fix. Not entirely sure what role
the padding plays, 0 is a valid queue ID.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 74765583405b..8c30f740a9c5 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1856,7 +1856,7 @@ static void bnxt_modify_rss(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 			indir_tbl[i] = rxfh->indir[i];
 		pad = bp->rss_indir_tbl_entries - tbl_size;
 		if (pad)
-			memset(&bp->rss_indir_tbl[i], 0, pad * sizeof(u16));
+			memset(&indir_tbl[i], 0, pad * sizeof(u16));
 	}
 }
 
-- 
2.45.2

[PATCH net-next 10/11] eth: bnxt: bump the entry size in indir tables to u32

[Jakub Kicinski]

Ethtool core stores indirection table with u32 entries, "just to be safe".
Switch the type in the driver, so that it's easier to swap local tables
for the core ones. Memory allocations already use sizeof(*entry), switch
the memset()s as well.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
--
v2:
 - switch from sizeof(u32) to sizeof(*indir_tbl)
 - add a sentence to the commit msg
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 8 ++++----
 drivers/net/ethernet/broadcom/bnxt/bnxt.h         | 4 ++--
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index f9554f512314..ed46d74533ed 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6225,7 +6225,7 @@ static u16 bnxt_cp_ring_for_tx(struct bnxt *bp, struct bnxt_tx_ring_info *txr)
 int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
 {
 	int entries;
-	u16 *tbl;
+	u32 *tbl;
 
 	if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
 		entries = BNXT_MAX_RSS_TABLE_ENTRIES_P5;
@@ -6248,7 +6248,7 @@ int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
 void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
 {
 	u16 max_rings, max_entries, pad, i;
-	u16 *rss_indir_tbl;
+	u32 *rss_indir_tbl;
 
 	if (!bp->rx_nr_rings)
 		return;
@@ -6269,12 +6269,12 @@ void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
 
 	pad = bp->rss_indir_tbl_entries - max_entries;
 	if (pad)
-		memset(&rss_indir_tbl[i], 0, pad * sizeof(u16));
+		memset(&rss_indir_tbl[i], 0, pad * sizeof(*rss_indir_tbl));
 }
 
 static u16 bnxt_get_max_rss_ring(struct bnxt *bp)
 {
-	u16 i, tbl_size, max_ring = 0;
+	u32 i, tbl_size, max_ring = 0;
 
 	if (!bp->rss_indir_tbl)
 		return 0;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index be40e0513777..1a33824a32a8 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1292,7 +1292,7 @@ struct bnxt_vnic_info {
 
 struct bnxt_rss_ctx {
 	struct bnxt_vnic_info vnic;
-	u16	*rss_indir_tbl;
+	u32	*rss_indir_tbl;
 	u8	index;
 };
 
@@ -2331,7 +2331,7 @@ struct bnxt {
 	struct bnxt_vnic_info	*vnic_info;
 	u32			num_rss_ctx;
 	int			nr_vnics;
-	u16			*rss_indir_tbl;
+	u32			*rss_indir_tbl;
 	u16			rss_indir_tbl_entries;
 	u32			rss_hash_cfg;
 	u32			rss_hash_delta;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 8c30f740a9c5..edcbb1a4f6c8 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1804,7 +1804,7 @@ static int bnxt_get_rxfh(struct net_device *dev,
 	u32 rss_context = rxfh->rss_context;
 	struct bnxt_rss_ctx *rss_ctx = NULL;
 	struct bnxt *bp = netdev_priv(dev);
-	u16 *indir_tbl = bp->rss_indir_tbl;
+	u32 *indir_tbl = bp->rss_indir_tbl;
 	struct bnxt_vnic_info *vnic;
 	u32 i, tbl_size;
 
@@ -1848,7 +1848,7 @@ static void bnxt_modify_rss(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 	}
 	if (rxfh->indir) {
 		u32 i, pad, tbl_size = bnxt_get_rxfh_indir_size(bp->dev);
-		u16 *indir_tbl = bp->rss_indir_tbl;
+		u32 *indir_tbl = bp->rss_indir_tbl;
 
 		if (rss_ctx)
 			indir_tbl = rss_ctx->rss_indir_tbl;
@@ -1856,7 +1856,7 @@ static void bnxt_modify_rss(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 			indir_tbl[i] = rxfh->indir[i];
 		pad = bp->rss_indir_tbl_entries - tbl_size;
 		if (pad)
-			memset(&indir_tbl[i], 0, pad * sizeof(u16));
+			memset(&indir_tbl[i], 0, pad * sizeof(*indir_tbl));
 	}
 }
 
-- 
2.45.2

[PATCH net-next 11/11] eth: bnxt: use the indir table from ethtool context

[Jakub Kicinski]

Instead of allocating a separate indir table in the vnic use
the one already present in the RSS context allocated by the core.
This saves some LoC and also we won't have to worry about syncing
the local version back to the core, once core learns how to dump
contexts.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
v2:
 - store a pointer to struct ethtool_rxfh_param instead of
   adding the ethtool_rxfh_priv_context() helper
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 23 +++++-------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  7 ++--
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 36 +++++++++----------
 3 files changed, 29 insertions(+), 37 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index ed46d74533ed..bb3be33c1bbd 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6222,10 +6222,9 @@ static u16 bnxt_cp_ring_for_tx(struct bnxt *bp, struct bnxt_tx_ring_info *txr)
 		return bnxt_cp_ring_from_grp(bp, &txr->tx_ring_struct);
 }
 
-int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
+static int bnxt_alloc_rss_indir_tbl(struct bnxt *bp)
 {
 	int entries;
-	u32 *tbl;
 
 	if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
 		entries = BNXT_MAX_RSS_TABLE_ENTRIES_P5;
@@ -6233,19 +6232,16 @@ int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
 		entries = HW_HASH_INDEX_SIZE;
 
 	bp->rss_indir_tbl_entries = entries;
-	tbl = kmalloc_array(entries, sizeof(*bp->rss_indir_tbl), GFP_KERNEL);
-	if (!tbl)
+	bp->rss_indir_tbl =
+		kmalloc_array(entries, sizeof(*bp->rss_indir_tbl), GFP_KERNEL);
+	if (!bp->rss_indir_tbl)
 		return -ENOMEM;
 
-	if (rss_ctx)
-		rss_ctx->rss_indir_tbl = tbl;
-	else
-		bp->rss_indir_tbl = tbl;
-
 	return 0;
 }
 
-void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
+void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp,
+				 struct ethtool_rxfh_context *rss_ctx)
 {
 	u16 max_rings, max_entries, pad, i;
 	u32 *rss_indir_tbl;
@@ -6260,7 +6256,7 @@ void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
 
 	max_entries = bnxt_get_rxfh_indir_size(bp->dev);
 	if (rss_ctx)
-		rss_indir_tbl = &rss_ctx->rss_indir_tbl[0];
+		rss_indir_tbl = ethtool_rxfh_context_indir(rss_ctx);
 	else
 		rss_indir_tbl = &bp->rss_indir_tbl[0];
 
@@ -6326,7 +6322,7 @@ static void bnxt_fill_hw_rss_tbl_p5(struct bnxt *bp,
 		if (vnic->flags & BNXT_VNIC_NTUPLE_FLAG)
 			j = ethtool_rxfh_indir_default(i, bp->rx_nr_rings);
 		else if (vnic->flags & BNXT_VNIC_RSSCTX_FLAG)
-			j = vnic->rss_ctx->rss_indir_tbl[i];
+			j = ethtool_rxfh_context_indir(vnic->rss_ctx)[i];
 		else
 			j = bp->rss_indir_tbl[i];
 		rxr = &bp->rx_ring[j];
@@ -10224,7 +10220,6 @@ void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 		dma_free_coherent(&bp->pdev->dev, vnic->rss_table_size,
 				  vnic->rss_table,
 				  vnic->rss_table_dma_addr);
-	kfree(rss_ctx->rss_indir_tbl);
 	bp->num_rss_ctx--;
 }
 
@@ -15689,7 +15684,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 			bp->flags |= BNXT_FLAG_CHIP_P7;
 	}
 
-	rc = bnxt_alloc_rss_indir_tbl(bp, NULL);
+	rc = bnxt_alloc_rss_indir_tbl(bp);
 	if (rc)
 		goto init_err_pci_clean;
 
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 1a33824a32a8..6bbdc718c3a7 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1286,13 +1286,12 @@ struct bnxt_vnic_info {
 #define BNXT_VNIC_RFS_NEW_RSS_FLAG	0x10
 #define BNXT_VNIC_NTUPLE_FLAG		0x20
 #define BNXT_VNIC_RSSCTX_FLAG		0x40
-	struct bnxt_rss_ctx	*rss_ctx;
+	struct ethtool_rxfh_context *rss_ctx;
 	u32		vnic_id;
 };
 
 struct bnxt_rss_ctx {
 	struct bnxt_vnic_info vnic;
-	u32	*rss_indir_tbl;
 	u8	index;
 };
 
@@ -2808,8 +2807,8 @@ int bnxt_hwrm_cfa_ntuple_filter_alloc(struct bnxt *bp,
 int bnxt_hwrm_vnic_set_tpa(struct bnxt *bp, struct bnxt_vnic_info *vnic,
 			   u32 tpa_flags);
 void bnxt_fill_ipv6_mask(__be32 mask[4]);
-int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx);
-void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx);
+void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp,
+				 struct ethtool_rxfh_context *rss_ctx);
 int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings);
 int bnxt_hwrm_vnic_cfg(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 int bnxt_hwrm_vnic_alloc(struct bnxt *bp, struct bnxt_vnic_info *vnic,
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index edcbb1a4f6c8..f121a5e9691f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1218,11 +1218,10 @@ static struct bnxt_rss_ctx *bnxt_get_rss_ctx_from_index(struct bnxt *bp,
 	return ethtool_rxfh_context_priv(ctx);
 }
 
-static int bnxt_alloc_rss_ctx_rss_table(struct bnxt *bp,
-					struct bnxt_rss_ctx *rss_ctx)
+static int bnxt_alloc_vnic_rss_table(struct bnxt *bp,
+				     struct bnxt_vnic_info *vnic)
 {
 	int size = L1_CACHE_ALIGN(BNXT_MAX_RSS_TABLE_SIZE_P5);
-	struct bnxt_vnic_info *vnic = &rss_ctx->vnic;
 
 	vnic->rss_table_size = size + HW_HASH_KEY_SIZE;
 	vnic->rss_table = dma_alloc_coherent(&bp->pdev->dev,
@@ -1801,7 +1800,6 @@ static u32 bnxt_get_rxfh_key_size(struct net_device *dev)
 static int bnxt_get_rxfh(struct net_device *dev,
 			 struct ethtool_rxfh_param *rxfh)
 {
-	u32 rss_context = rxfh->rss_context;
 	struct bnxt_rss_ctx *rss_ctx = NULL;
 	struct bnxt *bp = netdev_priv(dev);
 	u32 *indir_tbl = bp->rss_indir_tbl;
@@ -1815,10 +1813,13 @@ static int bnxt_get_rxfh(struct net_device *dev,
 
 	vnic = &bp->vnic_info[BNXT_VNIC_DEFAULT];
 	if (rxfh->rss_context) {
-		rss_ctx = bnxt_get_rss_ctx_from_index(bp, rss_context);
-		if (!rss_ctx)
+		struct ethtool_rxfh_context *ctx;
+
+		ctx = xa_load(&bp->dev->ethtool->rss_ctx, rxfh->rss_context);
+		if (!ctx)
 			return -EINVAL;
-		indir_tbl = rss_ctx->rss_indir_tbl;
+		indir_tbl = ethtool_rxfh_context_indir(ctx);
+		rss_ctx = ethtool_rxfh_context_priv(ctx);
 		vnic = &rss_ctx->vnic;
 	}
 
@@ -1834,7 +1835,8 @@ static int bnxt_get_rxfh(struct net_device *dev,
 	return 0;
 }
 
-static void bnxt_modify_rss(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
+static void bnxt_modify_rss(struct bnxt *bp, struct ethtool_rxfh_context *ctx,
+			    struct bnxt_rss_ctx *rss_ctx,
 			    const struct ethtool_rxfh_param *rxfh)
 {
 	if (rxfh->key) {
@@ -1851,7 +1853,7 @@ static void bnxt_modify_rss(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 		u32 *indir_tbl = bp->rss_indir_tbl;
 
 		if (rss_ctx)
-			indir_tbl = rss_ctx->rss_indir_tbl;
+			indir_tbl = ethtool_rxfh_context_indir(ctx);
 		for (i = 0; i < tbl_size; i++)
 			indir_tbl[i] = rxfh->indir[i];
 		pad = bp->rss_indir_tbl_entries - tbl_size;
@@ -1906,18 +1908,14 @@ static int bnxt_create_rxfh_context(struct net_device *dev,
 	bp->num_rss_ctx++;
 
 	vnic = &rss_ctx->vnic;
-	vnic->rss_ctx = rss_ctx;
+	vnic->rss_ctx = ctx;
 	vnic->flags |= BNXT_VNIC_RSSCTX_FLAG;
 	vnic->vnic_id = BNXT_VNIC_ID_INVALID;
-	rc = bnxt_alloc_rss_ctx_rss_table(bp, rss_ctx);
+	rc = bnxt_alloc_vnic_rss_table(bp, vnic);
 	if (rc)
 		goto out;
 
-	rc = bnxt_alloc_rss_indir_tbl(bp, rss_ctx);
-	if (rc)
-		goto out;
-
-	bnxt_set_dflt_rss_indir_tbl(bp, rss_ctx);
+	bnxt_set_dflt_rss_indir_tbl(bp, ctx);
 	memcpy(vnic->rss_hash_key, bp->rss_hash_key, HW_HASH_KEY_SIZE);
 
 	rc = bnxt_hwrm_vnic_alloc(bp, vnic, 0, bp->rx_nr_rings);
@@ -1931,7 +1929,7 @@ static int bnxt_create_rxfh_context(struct net_device *dev,
 		NL_SET_ERR_MSG_MOD(extack, "Unable to setup TPA");
 		goto out;
 	}
-	bnxt_modify_rss(bp, rss_ctx, rxfh);
+	bnxt_modify_rss(bp, ctx, rss_ctx, rxfh);
 
 	rc = __bnxt_setup_vnic_p5(bp, vnic);
 	if (rc) {
@@ -1961,7 +1959,7 @@ static int bnxt_modify_rxfh_context(struct net_device *dev,
 
 	rss_ctx = ethtool_rxfh_context_priv(ctx);
 
-	bnxt_modify_rss(bp, rss_ctx, rxfh);
+	bnxt_modify_rss(bp, ctx, rss_ctx, rxfh);
 
 	return bnxt_hwrm_vnic_rss_cfg_p5(bp, &rss_ctx->vnic);
 }
@@ -1990,7 +1988,7 @@ static int bnxt_set_rxfh(struct net_device *dev,
 	if (rxfh->hfunc && rxfh->hfunc != ETH_RSS_HASH_TOP)
 		return -EOPNOTSUPP;
 
-	bnxt_modify_rss(bp, NULL, rxfh);
+	bnxt_modify_rss(bp, NULL, NULL, rxfh);
 
 	bnxt_clear_usr_fltrs(bp, false);
 	if (netif_running(bp->dev)) {
-- 
2.45.2

Re: [PATCH net-next 00/11] eth: bnxt: use the new RSS API

[Pavan Chebbi]

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On Fri, Jul 12, 2024 at 3:37 AM Jakub Kicinski <kuba@kernel.org> wrote:
>
> Convert bnxt from using the set_rxfh API to separate create/modify/remove
> callbacks.
>
> Two small extensions to the core APIs are necessary:
>  - the ability to discard contexts if for some catastrophic reasons
>    device can no longer provide them;
>  - the ability to reserve space in the context for RSS table growth.
>
> The driver is adjusted to store indirection tables on u32 to make
> it easier to use core structs directly.
>
> With that out of the way the conversion is fairly straightforward.
>
> Since the opposition to discarding contexts was relatively mild
> and its what bnxt does already, I'm sticking to that. We may very
> well need to revisit that at a later time.
>
> v2:
>  - move "lost context" helper to common.c to avoid build problems
>    when ethtool-nl isn't enabled
>  - add a note about the counter proposal in the commit message
>  - move key_off to the end, under the private label (hiding from kdoc)
>  - remove bnxt_get_max_rss_ctx_ring()
>  - switch from sizeof(u32) to sizeof(*indir_tbl)
>  - add a sentence to the commit msg
>  - store a pointer to struct ethtool_rxfh_param instead of
>    adding the ethtool_rxfh_priv_context() helper
> v1: https://lore.kernel.org/all/20240702234757.4188344-1-kuba@kernel.org/

For a moment I was confused and a little scared not seeing v2 in the
subject line, until I opened the email :)
Series LGTM. Thanks to Edward and you for a cleaner infrastructure.
For the series:
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>

>
> Jakub Kicinski (11):
>   net: ethtool: let drivers remove lost RSS contexts
>   net: ethtool: let drivers declare max size of RSS indir table and key
>   eth: bnxt: allow deleting RSS contexts when the device is down
>   eth: bnxt: move from .set_rxfh to .create_rxfh_context and friends
>   eth: bnxt: remove rss_ctx_bmap
>   eth: bnxt: depend on core cleaning up RSS contexts
>   eth: bnxt: use context priv for struct bnxt_rss_ctx
>   eth: bnxt: use the RSS context XArray instead of the local list
>   eth: bnxt: pad out the correct indirection table
>   eth: bnxt: bump the entry size in indir tables to u32
>   eth: bnxt: use the indir table from ethtool context
>
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 126 +++++--------
>  drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  17 +-
>  .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 165 ++++++++++--------
>  include/linux/ethtool.h                       |  20 +--
>  net/ethtool/common.c                          |  14 ++
>  net/ethtool/ioctl.c                           |  46 +++--
>  6 files changed, 194 insertions(+), 194 deletions(-)
>
> --
> 2.45.2
>
>

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Re: [PATCH net-next 00/11] eth: bnxt: use the new RSS API

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 11 Jul 2024 15:07:02 -0700 you wrote:
> Convert bnxt from using the set_rxfh API to separate create/modify/remove
> callbacks.
> 
> Two small extensions to the core APIs are necessary:
>  - the ability to discard contexts if for some catastrophic reasons
>    device can no longer provide them;
>  - the ability to reserve space in the context for RSS table growth.
> 
> [...]

Here is the summary with links:
  - [net-next,01/11] net: ethtool: let drivers remove lost RSS contexts
    https://git.kernel.org/netdev/net-next/c/d69ba6bbaf1f
  - [net-next,02/11] net: ethtool: let drivers declare max size of RSS indir table and key
    https://git.kernel.org/netdev/net-next/c/28c8757a792b
  - [net-next,03/11] eth: bnxt: allow deleting RSS contexts when the device is down
    https://git.kernel.org/netdev/net-next/c/667ac333dbb7
  - [net-next,04/11] eth: bnxt: move from .set_rxfh to .create_rxfh_context and friends
    https://git.kernel.org/netdev/net-next/c/5c466b4d4e75
  - [net-next,05/11] eth: bnxt: remove rss_ctx_bmap
    https://git.kernel.org/netdev/net-next/c/1a49a23c034b
  - [net-next,06/11] eth: bnxt: depend on core cleaning up RSS contexts
    https://git.kernel.org/netdev/net-next/c/bf30162915f8
  - [net-next,07/11] eth: bnxt: use context priv for struct bnxt_rss_ctx
    https://git.kernel.org/netdev/net-next/c/63d4769cf74a
  - [net-next,08/11] eth: bnxt: use the RSS context XArray instead of the local list
    https://git.kernel.org/netdev/net-next/c/20c8ad72eb7f
  - [net-next,09/11] eth: bnxt: pad out the correct indirection table
    https://git.kernel.org/netdev/net-next/c/9c34c6c28c70
  - [net-next,10/11] eth: bnxt: bump the entry size in indir tables to u32
    https://git.kernel.org/netdev/net-next/c/73afb518af4a
  - [net-next,11/11] eth: bnxt: use the indir table from ethtool context
    https://git.kernel.org/netdev/net-next/c/46e457a454de

You are awesome, thank you!
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