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3149efcdf2c6314420c418dfc94de53bfd076b1f
329 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
 Vladimir Oltean
|
1b26d364e4 |
net: dsa: warn about dsa_port and dsa_switch bit fields being non atomic
As discussed during review here: https://patchwork.kernel.org/project/netdevbpf/patch/20220105132141.2648876-3-vladimir.oltean@nxp.com/ we should inform developers about pitfalls of concurrent access to the boolean properties of dsa_switch and dsa_port, now that they've been converted to bit fields. No other measure than a comment needs to be taken, since the code paths that update these bit fields are not concurrent with each other. Suggested-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|
Vladimir Oltean
|
63cfc65753 |
net: dsa: don't enumerate dsa_switch and dsa_port bit fields using commas
This is a cosmetic incremental fixup to commits |
||
|
Vladimir Oltean
|
4b026e8289 |
net: dsa: combine two holes in struct dsa_switch_tree
There is a 7 byte hole after dst->setup and a 4 byte hole after
dst->default_proto. Combining them, we have a single hole of just 3
bytes on 64 bit machines.
Before:
pahole -C dsa_switch_tree net/dsa/slave.o
struct dsa_switch_tree {
struct list_head list; /* 0 16 */
struct list_head ports; /* 16 16 */
struct raw_notifier_head nh; /* 32 8 */
unsigned int index; /* 40 4 */
struct kref refcount; /* 44 4 */
struct net_device * * lags; /* 48 8 */
bool setup; /* 56 1 */
/* XXX 7 bytes hole, try to pack */
/* --- cacheline 1 boundary (64 bytes) --- */
const struct dsa_device_ops * tag_ops; /* 64 8 */
enum dsa_tag_protocol default_proto; /* 72 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_platform_data * pd; /* 80 8 */
struct list_head rtable; /* 88 16 */
unsigned int lags_len; /* 104 4 */
unsigned int last_switch; /* 108 4 */
/* size: 112, cachelines: 2, members: 13 */
/* sum members: 101, holes: 2, sum holes: 11 */
/* last cacheline: 48 bytes */
};
After:
pahole -C dsa_switch_tree net/dsa/slave.o
struct dsa_switch_tree {
struct list_head list; /* 0 16 */
struct list_head ports; /* 16 16 */
struct raw_notifier_head nh; /* 32 8 */
unsigned int index; /* 40 4 */
struct kref refcount; /* 44 4 */
struct net_device * * lags; /* 48 8 */
const struct dsa_device_ops * tag_ops; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
enum dsa_tag_protocol default_proto; /* 64 4 */
bool setup; /* 68 1 */
/* XXX 3 bytes hole, try to pack */
struct dsa_platform_data * pd; /* 72 8 */
struct list_head rtable; /* 80 16 */
unsigned int lags_len; /* 96 4 */
unsigned int last_switch; /* 100 4 */
/* size: 104, cachelines: 2, members: 13 */
/* sum members: 101, holes: 1, sum holes: 3 */
/* last cacheline: 40 bytes */
};
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
Vladimir Oltean
|
b035c88c6a |
net: dsa: move dsa_switch_tree :: ports and lags to first cache line
dst->ports is accessed most notably by dsa_master_find_slave(), which is
invoked in the RX path.
dst->lags is accessed by dsa_lag_dev(), which is invoked in the RX path
of tag_dsa.c.
dst->tag_ops, dst->default_proto and dst->pd don't need to be in the
first cache line, so they are moved out by this change.
Before:
pahole -C dsa_switch_tree net/dsa/slave.o
struct dsa_switch_tree {
struct list_head list; /* 0 16 */
struct raw_notifier_head nh; /* 16 8 */
unsigned int index; /* 24 4 */
struct kref refcount; /* 28 4 */
bool setup; /* 32 1 */
/* XXX 7 bytes hole, try to pack */
const struct dsa_device_ops * tag_ops; /* 40 8 */
enum dsa_tag_protocol default_proto; /* 48 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_platform_data * pd; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct list_head ports; /* 64 16 */
struct list_head rtable; /* 80 16 */
struct net_device * * lags; /* 96 8 */
unsigned int lags_len; /* 104 4 */
unsigned int last_switch; /* 108 4 */
/* size: 112, cachelines: 2, members: 13 */
/* sum members: 101, holes: 2, sum holes: 11 */
/* last cacheline: 48 bytes */
};
After:
pahole -C dsa_switch_tree net/dsa/slave.o
struct dsa_switch_tree {
struct list_head list; /* 0 16 */
struct list_head ports; /* 16 16 */
struct raw_notifier_head nh; /* 32 8 */
unsigned int index; /* 40 4 */
struct kref refcount; /* 44 4 */
struct net_device * * lags; /* 48 8 */
bool setup; /* 56 1 */
/* XXX 7 bytes hole, try to pack */
/* --- cacheline 1 boundary (64 bytes) --- */
const struct dsa_device_ops * tag_ops; /* 64 8 */
enum dsa_tag_protocol default_proto; /* 72 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_platform_data * pd; /* 80 8 */
struct list_head rtable; /* 88 16 */
unsigned int lags_len; /* 104 4 */
unsigned int last_switch; /* 108 4 */
/* size: 112, cachelines: 2, members: 13 */
/* sum members: 101, holes: 2, sum holes: 11 */
/* last cacheline: 48 bytes */
};
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
Vladimir Oltean
|
258030acc9 |
net: dsa: make dsa_switch :: num_ports an unsigned int
Currently, num_ports is declared as size_t, which is defined as
__kernel_ulong_t, therefore it occupies 8 bytes of memory.
Even switches with port numbers in the range of tens are exotic, so
there is no need for this amount of storage.
Additionally, because the max_num_bridges member right above it is also
4 bytes, it means the compiler needs to add padding between the last 2
fields. By reducing the size, we don't need that padding and can reduce
the struct size.
Before:
pahole -C dsa_switch net/dsa/slave.o
struct dsa_switch {
struct device * dev; /* 0 8 */
struct dsa_switch_tree * dst; /* 8 8 */
unsigned int index; /* 16 4 */
u32 setup:1; /* 20: 0 4 */
u32 vlan_filtering_is_global:1; /* 20: 1 4 */
u32 needs_standalone_vlan_filtering:1; /* 20: 2 4 */
u32 configure_vlan_while_not_filtering:1; /* 20: 3 4 */
u32 untag_bridge_pvid:1; /* 20: 4 4 */
u32 assisted_learning_on_cpu_port:1; /* 20: 5 4 */
u32 vlan_filtering:1; /* 20: 6 4 */
u32 pcs_poll:1; /* 20: 7 4 */
u32 mtu_enforcement_ingress:1; /* 20: 8 4 */
/* XXX 23 bits hole, try to pack */
struct notifier_block nb; /* 24 24 */
/* XXX last struct has 4 bytes of padding */
void * priv; /* 48 8 */
void * tagger_data; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct dsa_chip_data * cd; /* 64 8 */
const struct dsa_switch_ops * ops; /* 72 8 */
u32 phys_mii_mask; /* 80 4 */
/* XXX 4 bytes hole, try to pack */
struct mii_bus * slave_mii_bus; /* 88 8 */
unsigned int ageing_time_min; /* 96 4 */
unsigned int ageing_time_max; /* 100 4 */
struct dsa_8021q_context * tag_8021q_ctx; /* 104 8 */
struct devlink * devlink; /* 112 8 */
unsigned int num_tx_queues; /* 120 4 */
unsigned int num_lag_ids; /* 124 4 */
/* --- cacheline 2 boundary (128 bytes) --- */
unsigned int max_num_bridges; /* 128 4 */
/* XXX 4 bytes hole, try to pack */
size_t num_ports; /* 136 8 */
/* size: 144, cachelines: 3, members: 27 */
/* sum members: 132, holes: 2, sum holes: 8 */
/* sum bitfield members: 9 bits, bit holes: 1, sum bit holes: 23 bits */
/* paddings: 1, sum paddings: 4 */
/* last cacheline: 16 bytes */
};
After:
pahole -C dsa_switch net/dsa/slave.o
struct dsa_switch {
struct device * dev; /* 0 8 */
struct dsa_switch_tree * dst; /* 8 8 */
unsigned int index; /* 16 4 */
u32 setup:1; /* 20: 0 4 */
u32 vlan_filtering_is_global:1; /* 20: 1 4 */
u32 needs_standalone_vlan_filtering:1; /* 20: 2 4 */
u32 configure_vlan_while_not_filtering:1; /* 20: 3 4 */
u32 untag_bridge_pvid:1; /* 20: 4 4 */
u32 assisted_learning_on_cpu_port:1; /* 20: 5 4 */
u32 vlan_filtering:1; /* 20: 6 4 */
u32 pcs_poll:1; /* 20: 7 4 */
u32 mtu_enforcement_ingress:1; /* 20: 8 4 */
/* XXX 23 bits hole, try to pack */
struct notifier_block nb; /* 24 24 */
/* XXX last struct has 4 bytes of padding */
void * priv; /* 48 8 */
void * tagger_data; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct dsa_chip_data * cd; /* 64 8 */
const struct dsa_switch_ops * ops; /* 72 8 */
u32 phys_mii_mask; /* 80 4 */
/* XXX 4 bytes hole, try to pack */
struct mii_bus * slave_mii_bus; /* 88 8 */
unsigned int ageing_time_min; /* 96 4 */
unsigned int ageing_time_max; /* 100 4 */
struct dsa_8021q_context * tag_8021q_ctx; /* 104 8 */
struct devlink * devlink; /* 112 8 */
unsigned int num_tx_queues; /* 120 4 */
unsigned int num_lag_ids; /* 124 4 */
/* --- cacheline 2 boundary (128 bytes) --- */
unsigned int max_num_bridges; /* 128 4 */
unsigned int num_ports; /* 132 4 */
/* size: 136, cachelines: 3, members: 27 */
/* sum members: 128, holes: 1, sum holes: 4 */
/* sum bitfield members: 9 bits, bit holes: 1, sum bit holes: 23 bits */
/* paddings: 1, sum paddings: 4 */
/* last cacheline: 8 bytes */
};
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
Vladimir Oltean
|
7787ff7763 |
net: dsa: merge all bools of struct dsa_switch into a single u32
struct dsa_switch has 9 boolean properties, many of which are in fact
set by drivers for custom behavior (vlan_filtering_is_global,
needs_standalone_vlan_filtering, etc etc). The binary layout of the
structure could be improved. For example, the "bool setup" at the
beginning introduces a gratuitous 7 byte hole in the first cache line.
The change merges all boolean properties into bitfields of an u32, and
places that u32 in the first cache line of the structure, since many
bools are accessed from the data path (untag_bridge_pvid, vlan_filtering,
vlan_filtering_is_global).
We place this u32 after the existing ds->index, which is also 4 bytes in
size. As a positive side effect, ds->tagger_data now fits into the first
cache line too, because 4 bytes are saved.
Before:
pahole -C dsa_switch net/dsa/slave.o
struct dsa_switch {
bool setup; /* 0 1 */
/* XXX 7 bytes hole, try to pack */
struct device * dev; /* 8 8 */
struct dsa_switch_tree * dst; /* 16 8 */
unsigned int index; /* 24 4 */
/* XXX 4 bytes hole, try to pack */
struct notifier_block nb; /* 32 24 */
/* XXX last struct has 4 bytes of padding */
void * priv; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
void * tagger_data; /* 64 8 */
struct dsa_chip_data * cd; /* 72 8 */
const struct dsa_switch_ops * ops; /* 80 8 */
u32 phys_mii_mask; /* 88 4 */
/* XXX 4 bytes hole, try to pack */
struct mii_bus * slave_mii_bus; /* 96 8 */
unsigned int ageing_time_min; /* 104 4 */
unsigned int ageing_time_max; /* 108 4 */
struct dsa_8021q_context * tag_8021q_ctx; /* 112 8 */
struct devlink * devlink; /* 120 8 */
/* --- cacheline 2 boundary (128 bytes) --- */
unsigned int num_tx_queues; /* 128 4 */
bool vlan_filtering_is_global; /* 132 1 */
bool needs_standalone_vlan_filtering; /* 133 1 */
bool configure_vlan_while_not_filtering; /* 134 1 */
bool untag_bridge_pvid; /* 135 1 */
bool assisted_learning_on_cpu_port; /* 136 1 */
bool vlan_filtering; /* 137 1 */
bool pcs_poll; /* 138 1 */
bool mtu_enforcement_ingress; /* 139 1 */
unsigned int num_lag_ids; /* 140 4 */
unsigned int max_num_bridges; /* 144 4 */
/* XXX 4 bytes hole, try to pack */
size_t num_ports; /* 152 8 */
/* size: 160, cachelines: 3, members: 27 */
/* sum members: 141, holes: 4, sum holes: 19 */
/* paddings: 1, sum paddings: 4 */
/* last cacheline: 32 bytes */
};
After:
pahole -C dsa_switch net/dsa/slave.o
struct dsa_switch {
struct device * dev; /* 0 8 */
struct dsa_switch_tree * dst; /* 8 8 */
unsigned int index; /* 16 4 */
u32 setup:1; /* 20: 0 4 */
u32 vlan_filtering_is_global:1; /* 20: 1 4 */
u32 needs_standalone_vlan_filtering:1; /* 20: 2 4 */
u32 configure_vlan_while_not_filtering:1; /* 20: 3 4 */
u32 untag_bridge_pvid:1; /* 20: 4 4 */
u32 assisted_learning_on_cpu_port:1; /* 20: 5 4 */
u32 vlan_filtering:1; /* 20: 6 4 */
u32 pcs_poll:1; /* 20: 7 4 */
u32 mtu_enforcement_ingress:1; /* 20: 8 4 */
/* XXX 23 bits hole, try to pack */
struct notifier_block nb; /* 24 24 */
/* XXX last struct has 4 bytes of padding */
void * priv; /* 48 8 */
void * tagger_data; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct dsa_chip_data * cd; /* 64 8 */
const struct dsa_switch_ops * ops; /* 72 8 */
u32 phys_mii_mask; /* 80 4 */
/* XXX 4 bytes hole, try to pack */
struct mii_bus * slave_mii_bus; /* 88 8 */
unsigned int ageing_time_min; /* 96 4 */
unsigned int ageing_time_max; /* 100 4 */
struct dsa_8021q_context * tag_8021q_ctx; /* 104 8 */
struct devlink * devlink; /* 112 8 */
unsigned int num_tx_queues; /* 120 4 */
unsigned int num_lag_ids; /* 124 4 */
/* --- cacheline 2 boundary (128 bytes) --- */
unsigned int max_num_bridges; /* 128 4 */
/* XXX 4 bytes hole, try to pack */
size_t num_ports; /* 136 8 */
/* size: 144, cachelines: 3, members: 27 */
/* sum members: 132, holes: 2, sum holes: 8 */
/* sum bitfield members: 9 bits, bit holes: 1, sum bit holes: 23 bits */
/* paddings: 1, sum paddings: 4 */
/* last cacheline: 16 bytes */
};
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
Vladimir Oltean
|
0625125877 |
net: dsa: move dsa_port :: type near dsa_port :: index
Both dsa_port :: type and dsa_port :: index introduce a 4 octet hole
after them, so we can group them together and the holes would be
eliminated, turning 16 octets of storage into just 8. This makes the
cpu_dp pointer fit in the first cache line, which is good, because
dsa_slave_to_master(), called by dsa_enqueue_skb(), uses it.
Before:
pahole -C dsa_port net/dsa/slave.o
struct dsa_port {
union {
struct net_device * master; /* 0 8 */
struct net_device * slave; /* 0 8 */
}; /* 0 8 */
const struct dsa_device_ops * tag_ops; /* 8 8 */
struct dsa_switch_tree * dst; /* 16 8 */
struct sk_buff * (*rcv)(struct sk_buff *, struct net_device *); /* 24 8 */
enum {
DSA_PORT_TYPE_UNUSED = 0,
DSA_PORT_TYPE_CPU = 1,
DSA_PORT_TYPE_DSA = 2,
DSA_PORT_TYPE_USER = 3,
} type; /* 32 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_switch * ds; /* 40 8 */
unsigned int index; /* 48 4 */
/* XXX 4 bytes hole, try to pack */
const char * name; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct dsa_port * cpu_dp; /* 64 8 */
u8 mac[6]; /* 72 6 */
u8 stp_state; /* 78 1 */
u8 vlan_filtering:1; /* 79: 0 1 */
u8 learning:1; /* 79: 1 1 */
u8 lag_tx_enabled:1; /* 79: 2 1 */
u8 devlink_port_setup:1; /* 79: 3 1 */
u8 setup:1; /* 79: 4 1 */
/* XXX 3 bits hole, try to pack */
struct device_node * dn; /* 80 8 */
unsigned int ageing_time; /* 88 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_bridge * bridge; /* 96 8 */
struct devlink_port devlink_port; /* 104 288 */
/* --- cacheline 6 boundary (384 bytes) was 8 bytes ago --- */
struct phylink * pl; /* 392 8 */
struct phylink_config pl_config; /* 400 40 */
struct net_device * lag_dev; /* 440 8 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct net_device * hsr_dev; /* 448 8 */
struct list_head list; /* 456 16 */
const struct ethtool_ops * orig_ethtool_ops; /* 472 8 */
const struct dsa_netdevice_ops * netdev_ops; /* 480 8 */
struct mutex addr_lists_lock; /* 488 32 */
/* --- cacheline 8 boundary (512 bytes) was 8 bytes ago --- */
struct list_head fdbs; /* 520 16 */
struct list_head mdbs; /* 536 16 */
/* size: 552, cachelines: 9, members: 30 */
/* sum members: 539, holes: 3, sum holes: 12 */
/* sum bitfield members: 5 bits, bit holes: 1, sum bit holes: 3 bits */
/* last cacheline: 40 bytes */
};
After:
pahole -C dsa_port net/dsa/slave.o
struct dsa_port {
union {
struct net_device * master; /* 0 8 */
struct net_device * slave; /* 0 8 */
}; /* 0 8 */
const struct dsa_device_ops * tag_ops; /* 8 8 */
struct dsa_switch_tree * dst; /* 16 8 */
struct sk_buff * (*rcv)(struct sk_buff *, struct net_device *); /* 24 8 */
struct dsa_switch * ds; /* 32 8 */
unsigned int index; /* 40 4 */
enum {
DSA_PORT_TYPE_UNUSED = 0,
DSA_PORT_TYPE_CPU = 1,
DSA_PORT_TYPE_DSA = 2,
DSA_PORT_TYPE_USER = 3,
} type; /* 44 4 */
const char * name; /* 48 8 */
struct dsa_port * cpu_dp; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
u8 mac[6]; /* 64 6 */
u8 stp_state; /* 70 1 */
u8 vlan_filtering:1; /* 71: 0 1 */
u8 learning:1; /* 71: 1 1 */
u8 lag_tx_enabled:1; /* 71: 2 1 */
u8 devlink_port_setup:1; /* 71: 3 1 */
u8 setup:1; /* 71: 4 1 */
/* XXX 3 bits hole, try to pack */
struct device_node * dn; /* 72 8 */
unsigned int ageing_time; /* 80 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_bridge * bridge; /* 88 8 */
struct devlink_port devlink_port; /* 96 288 */
/* --- cacheline 6 boundary (384 bytes) --- */
struct phylink * pl; /* 384 8 */
struct phylink_config pl_config; /* 392 40 */
struct net_device * lag_dev; /* 432 8 */
struct net_device * hsr_dev; /* 440 8 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct list_head list; /* 448 16 */
const struct ethtool_ops * orig_ethtool_ops; /* 464 8 */
const struct dsa_netdevice_ops * netdev_ops; /* 472 8 */
struct mutex addr_lists_lock; /* 480 32 */
/* --- cacheline 8 boundary (512 bytes) --- */
struct list_head fdbs; /* 512 16 */
struct list_head mdbs; /* 528 16 */
/* size: 544, cachelines: 9, members: 30 */
/* sum members: 539, holes: 1, sum holes: 4 */
/* sum bitfield members: 5 bits, bit holes: 1, sum bit holes: 3 bits */
/* last cacheline: 32 bytes */
};
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
Vladimir Oltean
|
bde82f389a |
net: dsa: merge all bools of struct dsa_port into a single u8
struct dsa_port has 5 bool members which create quite a number of 7 byte
holes in the structure layout. By merging them all into bitfields of an
u8, and placing that u8 in the 1-byte hole after dp->mac and dp->stp_state,
we can reduce the structure size from 576 bytes to 552 bytes on arm64.
Before:
pahole -C dsa_port net/dsa/slave.o
struct dsa_port {
union {
struct net_device * master; /* 0 8 */
struct net_device * slave; /* 0 8 */
}; /* 0 8 */
const struct dsa_device_ops * tag_ops; /* 8 8 */
struct dsa_switch_tree * dst; /* 16 8 */
struct sk_buff * (*rcv)(struct sk_buff *, struct net_device *); /* 24 8 */
enum {
DSA_PORT_TYPE_UNUSED = 0,
DSA_PORT_TYPE_CPU = 1,
DSA_PORT_TYPE_DSA = 2,
DSA_PORT_TYPE_USER = 3,
} type; /* 32 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_switch * ds; /* 40 8 */
unsigned int index; /* 48 4 */
/* XXX 4 bytes hole, try to pack */
const char * name; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct dsa_port * cpu_dp; /* 64 8 */
u8 mac[6]; /* 72 6 */
u8 stp_state; /* 78 1 */
/* XXX 1 byte hole, try to pack */
struct device_node * dn; /* 80 8 */
unsigned int ageing_time; /* 88 4 */
bool vlan_filtering; /* 92 1 */
bool learning; /* 93 1 */
/* XXX 2 bytes hole, try to pack */
struct dsa_bridge * bridge; /* 96 8 */
struct devlink_port devlink_port; /* 104 288 */
/* --- cacheline 6 boundary (384 bytes) was 8 bytes ago --- */
bool devlink_port_setup; /* 392 1 */
/* XXX 7 bytes hole, try to pack */
struct phylink * pl; /* 400 8 */
struct phylink_config pl_config; /* 408 40 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct net_device * lag_dev; /* 448 8 */
bool lag_tx_enabled; /* 456 1 */
/* XXX 7 bytes hole, try to pack */
struct net_device * hsr_dev; /* 464 8 */
struct list_head list; /* 472 16 */
const struct ethtool_ops * orig_ethtool_ops; /* 488 8 */
const struct dsa_netdevice_ops * netdev_ops; /* 496 8 */
struct mutex addr_lists_lock; /* 504 32 */
/* --- cacheline 8 boundary (512 bytes) was 24 bytes ago --- */
struct list_head fdbs; /* 536 16 */
struct list_head mdbs; /* 552 16 */
bool setup; /* 568 1 */
/* size: 576, cachelines: 9, members: 30 */
/* sum members: 544, holes: 6, sum holes: 25 */
/* padding: 7 */
};
After:
pahole -C dsa_port net/dsa/slave.o
struct dsa_port {
union {
struct net_device * master; /* 0 8 */
struct net_device * slave; /* 0 8 */
}; /* 0 8 */
const struct dsa_device_ops * tag_ops; /* 8 8 */
struct dsa_switch_tree * dst; /* 16 8 */
struct sk_buff * (*rcv)(struct sk_buff *, struct net_device *); /* 24 8 */
enum {
DSA_PORT_TYPE_UNUSED = 0,
DSA_PORT_TYPE_CPU = 1,
DSA_PORT_TYPE_DSA = 2,
DSA_PORT_TYPE_USER = 3,
} type; /* 32 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_switch * ds; /* 40 8 */
unsigned int index; /* 48 4 */
/* XXX 4 bytes hole, try to pack */
const char * name; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct dsa_port * cpu_dp; /* 64 8 */
u8 mac[6]; /* 72 6 */
u8 stp_state; /* 78 1 */
u8 vlan_filtering:1; /* 79: 0 1 */
u8 learning:1; /* 79: 1 1 */
u8 lag_tx_enabled:1; /* 79: 2 1 */
u8 devlink_port_setup:1; /* 79: 3 1 */
u8 setup:1; /* 79: 4 1 */
/* XXX 3 bits hole, try to pack */
struct device_node * dn; /* 80 8 */
unsigned int ageing_time; /* 88 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_bridge * bridge; /* 96 8 */
struct devlink_port devlink_port; /* 104 288 */
/* --- cacheline 6 boundary (384 bytes) was 8 bytes ago --- */
struct phylink * pl; /* 392 8 */
struct phylink_config pl_config; /* 400 40 */
struct net_device * lag_dev; /* 440 8 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct net_device * hsr_dev; /* 448 8 */
struct list_head list; /* 456 16 */
const struct ethtool_ops * orig_ethtool_ops; /* 472 8 */
const struct dsa_netdevice_ops * netdev_ops; /* 480 8 */
struct mutex addr_lists_lock; /* 488 32 */
/* --- cacheline 8 boundary (512 bytes) was 8 bytes ago --- */
struct list_head fdbs; /* 520 16 */
struct list_head mdbs; /* 536 16 */
/* size: 552, cachelines: 9, members: 30 */
/* sum members: 539, holes: 3, sum holes: 12 */
/* sum bitfield members: 5 bits, bit holes: 1, sum bit holes: 3 bits */
/* last cacheline: 40 bytes */
};
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
Vladimir Oltean
|
b08db33dab |
net: dsa: move dsa_port :: stp_state near dsa_port :: mac
The MAC address of a port is 6 octets in size, and this creates a 2
octet hole after it. There are some other u8 members of struct dsa_port
that we can put in that hole. One such member is the stp_state.
Before:
pahole -C dsa_port net/dsa/slave.o
struct dsa_port {
union {
struct net_device * master; /* 0 8 */
struct net_device * slave; /* 0 8 */
}; /* 0 8 */
const struct dsa_device_ops * tag_ops; /* 8 8 */
struct dsa_switch_tree * dst; /* 16 8 */
struct sk_buff * (*rcv)(struct sk_buff *, struct net_device *); /* 24 8 */
enum {
DSA_PORT_TYPE_UNUSED = 0,
DSA_PORT_TYPE_CPU = 1,
DSA_PORT_TYPE_DSA = 2,
DSA_PORT_TYPE_USER = 3,
} type; /* 32 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_switch * ds; /* 40 8 */
unsigned int index; /* 48 4 */
/* XXX 4 bytes hole, try to pack */
const char * name; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct dsa_port * cpu_dp; /* 64 8 */
u8 mac[6]; /* 72 6 */
/* XXX 2 bytes hole, try to pack */
struct device_node * dn; /* 80 8 */
unsigned int ageing_time; /* 88 4 */
bool vlan_filtering; /* 92 1 */
bool learning; /* 93 1 */
u8 stp_state; /* 94 1 */
/* XXX 1 byte hole, try to pack */
struct dsa_bridge * bridge; /* 96 8 */
struct devlink_port devlink_port; /* 104 288 */
/* --- cacheline 6 boundary (384 bytes) was 8 bytes ago --- */
bool devlink_port_setup; /* 392 1 */
/* XXX 7 bytes hole, try to pack */
struct phylink * pl; /* 400 8 */
struct phylink_config pl_config; /* 408 40 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct net_device * lag_dev; /* 448 8 */
bool lag_tx_enabled; /* 456 1 */
/* XXX 7 bytes hole, try to pack */
struct net_device * hsr_dev; /* 464 8 */
struct list_head list; /* 472 16 */
const struct ethtool_ops * orig_ethtool_ops; /* 488 8 */
const struct dsa_netdevice_ops * netdev_ops; /* 496 8 */
struct mutex addr_lists_lock; /* 504 32 */
/* --- cacheline 8 boundary (512 bytes) was 24 bytes ago --- */
struct list_head fdbs; /* 536 16 */
struct list_head mdbs; /* 552 16 */
bool setup; /* 568 1 */
/* size: 576, cachelines: 9, members: 30 */
/* sum members: 544, holes: 6, sum holes: 25 */
/* padding: 7 */
};
After:
pahole -C dsa_port net/dsa/slave.o
struct dsa_port {
union {
struct net_device * master; /* 0 8 */
struct net_device * slave; /* 0 8 */
}; /* 0 8 */
const struct dsa_device_ops * tag_ops; /* 8 8 */
struct dsa_switch_tree * dst; /* 16 8 */
struct sk_buff * (*rcv)(struct sk_buff *, struct net_device *); /* 24 8 */
enum {
DSA_PORT_TYPE_UNUSED = 0,
DSA_PORT_TYPE_CPU = 1,
DSA_PORT_TYPE_DSA = 2,
DSA_PORT_TYPE_USER = 3,
} type; /* 32 4 */
/* XXX 4 bytes hole, try to pack */
struct dsa_switch * ds; /* 40 8 */
unsigned int index; /* 48 4 */
/* XXX 4 bytes hole, try to pack */
const char * name; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct dsa_port * cpu_dp; /* 64 8 */
u8 mac[6]; /* 72 6 */
u8 stp_state; /* 78 1 */
/* XXX 1 byte hole, try to pack */
struct device_node * dn; /* 80 8 */
unsigned int ageing_time; /* 88 4 */
bool vlan_filtering; /* 92 1 */
bool learning; /* 93 1 */
/* XXX 2 bytes hole, try to pack */
struct dsa_bridge * bridge; /* 96 8 */
struct devlink_port devlink_port; /* 104 288 */
/* --- cacheline 6 boundary (384 bytes) was 8 bytes ago --- */
bool devlink_port_setup; /* 392 1 */
/* XXX 7 bytes hole, try to pack */
struct phylink * pl; /* 400 8 */
struct phylink_config pl_config; /* 408 40 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct net_device * lag_dev; /* 448 8 */
bool lag_tx_enabled; /* 456 1 */
/* XXX 7 bytes hole, try to pack */
struct net_device * hsr_dev; /* 464 8 */
struct list_head list; /* 472 16 */
const struct ethtool_ops * orig_ethtool_ops; /* 488 8 */
const struct dsa_netdevice_ops * netdev_ops; /* 496 8 */
struct mutex addr_lists_lock; /* 504 32 */
/* --- cacheline 8 boundary (512 bytes) was 24 bytes ago --- */
struct list_head fdbs; /* 536 16 */
struct list_head mdbs; /* 552 16 */
bool setup; /* 568 1 */
/* size: 576, cachelines: 9, members: 30 */
/* sum members: 544, holes: 6, sum holes: 25 */
/* padding: 7 */
};
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
Vladimir Oltean
|
7f2973149c |
net: dsa: make tagging protocols connect to individual switches from a tree
On the NXP Bluebox 3 board which uses a multi-switch setup with sja1105, the mechanism through which the tagger connects to the switch tree is broken, due to improper DSA code design. At the time when tag_ops->connect() is called in dsa_port_parse_cpu(), DSA hasn't finished "touching" all the ports, so it doesn't know how large the tree is and how many ports it has. It has just seen the first CPU port by this time. As a result, this function will call the tagger's ->connect method too early, and the tagger will connect only to the first switch from the tree. This could be perhaps addressed a bit more simply by just moving the tag_ops->connect(dst) call a bit later (for example in dsa_tree_setup), but there is already a design inconsistency at present: on the switch side, the notification is on a per-switch basis, but on the tagger side, it is on a per-tree basis. Furthermore, the persistent storage itself is per switch (ds->tagger_data). And the tagger connect and disconnect procedures (at least the ones that exist currently) could see a fair bit of simplification if they didn't have to iterate through the switches of a tree. To fix the issue, this change transforms tag_ops->connect(dst) into tag_ops->connect(ds) and moves it somewhere where we already iterate over all switches of a tree. That is in dsa_switch_setup_tag_protocol(), which is a good placement because we already have there the connection call to the switch side of things. As for the dsa_tree_bind_tag_proto() method (called from the code path that changes the tag protocol), things are a bit more complicated because we receive the tree as argument, yet when we unwind on errors, it would be nice to not call tag_ops->disconnect(ds) where we didn't previously call tag_ops->connect(ds). We didn't have this problem before because the tag_ops connection operations passed the entire dst before, and this is more fine grained now. To solve the error rewind case using the new API, we have to create yet one more cross-chip notifier for disconnection, and stay connected with the old tag protocol to all the switches in the tree until we've succeeded to connect with the new one as well. So if something fails half way, the whole tree is still connected to the old tagger. But there may still be leaks if the tagger fails to connect to the 2nd out of 3 switches in a tree: somebody needs to tell the tagger to disconnect from the first switch. Nothing comes for free, and this was previously handled privately by the tagging protocol driver before, but now we need to emit a disconnect cross-chip notifier for that, because DSA has to take care of the unwind path. We assume that the tagging protocol has connected to a switch if it has set ds->tagger_data to something, otherwise we avoid calling its disconnection method in the error rewind path. The rest of the changes are in the tagging protocol drivers, and have to do with the replacement of dst with ds. The iteration is removed and the error unwind path is simplified, as mentioned above. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|
Vladimir Oltean
|
4f3cb34364 |
net: dsa: remove dp->priv
All current in-tree uses of dp->priv have been replaced with ds->tagger_data, which provides for a safer API especially when the connection isn't the regular 1:1 link between one switch driver and one tagging protocol driver, but could be either one switch to many taggers, or many switches to one tagger. Therefore, we can remove this unused pointer. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|
Vladimir Oltean
|
dc452a471d |
net: dsa: introduce tagger-owned storage for private and shared data
Ansuel is working on register access over Ethernet for the qca8k switch family. This requires the qca8k tagging protocol driver to receive frames which aren't intended for the network stack, but instead for the qca8k switch driver itself. The dp->priv is currently the prevailing method for passing data back and forth between the tagging protocol driver and the switch driver. However, this method is riddled with caveats. The DSA design allows in principle for any switch driver to return any protocol it desires in ->get_tag_protocol(). The dsa_loop driver can be modified to do just that. But in the current design, the memory behind dp->priv has to be allocated by the switch driver, so if the tagging protocol is paired to an unexpected switch driver, we may end up in NULL pointer dereferences inside the kernel, or worse (a switch driver may allocate dp->priv according to the expectations of a different tagger). The latter possibility is even more plausible considering that DSA switches can dynamically change tagging protocols in certain cases (dsa <-> edsa, ocelot <-> ocelot-8021q), and the current design lends itself to mistakes that are all too easy to make. This patch proposes that the tagging protocol driver should manage its own memory, instead of relying on the switch driver to do so. After analyzing the different in-tree needs, it can be observed that the required tagger storage is per switch, therefore a ds->tagger_data pointer is introduced. In principle, per-port storage could also be introduced, although there is no need for it at the moment. Future changes will replace the current usage of dp->priv with ds->tagger_data. We define a "binding" event between the DSA switch tree and the tagging protocol. During this binding event, the tagging protocol's ->connect() method is called first, and this may allocate some memory for each switch of the tree. Then a cross-chip notifier is emitted for the switches within that tree, and they are given the opportunity to fix up the tagger's memory (for example, they might set up some function pointers that represent virtual methods for consuming packets). Because the memory is owned by the tagger, there exists a ->disconnect() method for the tagger (which is the place to free the resources), but there doesn't exist a ->disconnect() method for the switch driver. This is part of the design. The switch driver should make minimal use of the public part of the tagger data, and only after type-checking it using the supplied "proto" argument. In the code there are in fact two binding events, one is the initial event in dsa_switch_setup_tag_protocol(). At this stage, the cross chip notifier chains aren't initialized, so we call each switch's connect() method by hand. Then there is dsa_tree_bind_tag_proto() during dsa_tree_change_tag_proto(), and here we have an old protocol and a new one. We first connect to the new one before disconnecting from the old one, to simplify error handling a bit and to ensure we remain in a valid state at all times. Co-developed-by: Ansuel Smith <ansuelsmth@gmail.com> Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|
Vladimir Oltean
|
857fdd74fb |
net: dsa: eliminate dsa_switch_ops :: port_bridge_tx_fwd_{,un}offload
We don't really need new switch API for these, and with new switches
which intend to add support for this feature, it will become cumbersome
to maintain.
The change consists in restructuring the two drivers that implement this
offload (sja1105 and mv88e6xxx) such that the offload is enabled and
disabled from the ->port_bridge_{join,leave} methods instead of the old
->port_bridge_tx_fwd_{,un}offload.
The only non-trivial change is that mv88e6xxx_map_virtual_bridge_to_pvt()
has been moved to avoid a forward declaration, and the
mv88e6xxx_reg_lock() calls from inside it have been removed, since
locking is now done from mv88e6xxx_port_bridge_{join,leave}.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
|
||
|
Vladimir Oltean
|
b079922ba2 |
net: dsa: add a "tx_fwd_offload" argument to ->port_bridge_join
This is a preparation patch for the removal of the DSA switch methods ->port_bridge_tx_fwd_offload() and ->port_bridge_tx_fwd_unoffload(). The plan is for the switch to report whether it offloads TX forwarding directly as a response to the ->port_bridge_join() method. This change deals with the noisy portion of converting all existing function prototypes to take this new boolean pointer argument. The bool is placed in the cross-chip notifier structure for bridge join, and a reference to it is provided to drivers. In the next change, DSA will then actually look at this value instead of calling ->port_bridge_tx_fwd_offload(). Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
||
|
Vladimir Oltean
|
d3eed0e57d |
net: dsa: keep the bridge_dev and bridge_num as part of the same structure
The main desire behind this is to provide coherent bridge information to
the fast path without locking.
For example, right now we set dp->bridge_dev and dp->bridge_num from
separate code paths, it is theoretically possible for a packet
transmission to read these two port properties consecutively and find a
bridge number which does not correspond with the bridge device.
Another desire is to start passing more complex bridge information to
dsa_switch_ops functions. For example, with FDB isolation, it is
expected that drivers will need to be passed the bridge which requested
an FDB/MDB entry to be offloaded, and along with that bridge_dev, the
associated bridge_num should be passed too, in case the driver might
want to implement an isolation scheme based on that number.
We already pass the {bridge_dev, bridge_num} pair to the TX forwarding
offload switch API, however we'd like to remove that and squash it into
the basic bridge join/leave API. So that means we need to pass this
pair to the bridge join/leave API.
During dsa_port_bridge_leave, first we unset dp->bridge_dev, then we
call the driver's .port_bridge_leave with what used to be our
dp->bridge_dev, but provided as an argument.
When bridge_dev and bridge_num get folded into a single structure, we
need to preserve this behavior in dsa_port_bridge_leave: we need a copy
of what used to be in dp->bridge.
Switch drivers check bridge membership by comparing dp->bridge_dev with
the provided bridge_dev, but now, if we provide the struct dsa_bridge as
a pointer, they cannot keep comparing dp->bridge to the provided
pointer, since this only points to an on-stack copy. To make this
obvious and prevent driver writers from forgetting and doing stupid
things, in this new API, the struct dsa_bridge is provided as a full
structure (not very large, contains an int and a pointer) instead of a
pointer. An explicit comparison function needs to be used to determine
bridge membership: dsa_port_offloads_bridge().
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
|
||
|
Vladimir Oltean
|
6a43cba303 |
net: dsa: export bridging offload helpers to drivers
Move the static inline helpers from net/dsa/dsa_priv.h to include/net/dsa.h, so that drivers can call functions such as dsa_port_offloads_bridge_dev(), which will be necessary after the transition to a more complex bridge structure. More functions than are needed right now are being moved, but this is done for uniformity. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
||
|
Vladimir Oltean
|
36cbf39b56 |
net: dsa: hide dp->bridge_dev and dp->bridge_num in the core behind helpers
The location of the bridge device pointer and number is going to change. It is not going to be kept individually per port, but in a common structure allocated dynamically and which will have lockdep validation. Create helpers to access these elements so that we have a migration path to the new organization. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
||
|
Vladimir Oltean
|
947c8746e2 |
net: dsa: assign a bridge number even without TX forwarding offload
The service where DSA assigns a unique bridge number for each forwarding domain is useful even for drivers which do not implement the TX forwarding offload feature. For example, drivers might use the dp->bridge_num for FDB isolation. So rename ds->num_fwd_offloading_bridges to ds->max_num_bridges, and calculate a unique bridge_num for all drivers that set this value. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
||
|
Vladimir Oltean
|
3f9bb0301d |
net: dsa: make dp->bridge_num one-based
I have seen too many bugs already due to the fact that we must encode an
invalid dp->bridge_num as a negative value, because the natural tendency
is to check that invalid value using (!dp->bridge_num). Latest example
can be seen in commit
|
||
 Russell King (Oracle)
|
072eea6c22 |
net: dsa: replace phylink_get_interfaces() with phylink_get_caps()
Phylink needs slightly more information than phylink_get_interfaces() allows us to get from the DSA drivers - we need the MAC capabilities. Replace the phylink_get_interfaces() method with phylink_get_caps() to allow DSA drivers to fill in the phylink_config MAC capabilities field as well. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Marek Behún <kabel@kernel.org> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
||
 Marek Behún
|
c07c6e8eb4 |
net: dsa: populate supported_interfaces member
Add a new DSA switch operation, phylink_get_interfaces, which should fill in which PHY_INTERFACE_MODE_* are supported by given port. Use this before phylink_create() to fill phylinks supported_interfaces member, allowing phylink to determine which PHY_INTERFACE_MODEs are supported. Signed-off-by: Marek Behún <kabel@kernel.org> [tweaked patch and description to add more complete support -- rmk] Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|
Vladimir Oltean
|
338a3a4745 |
net: dsa: introduce locking for the address lists on CPU and DSA ports
Now that the rtnl_mutex is going away for dsa_port_{host_,}fdb_{add,del},
no one is serializing access to the address lists that DSA keeps for the
purpose of reference counting on shared ports (CPU and cascade ports).
It can happen for one dsa_switch_do_fdb_del to do list_del on a dp->fdbs
element while another dsa_switch_do_fdb_{add,del} is traversing dp->fdbs.
We need to avoid that.
Currently dp->mdbs is not at risk, because dsa_switch_do_mdb_{add,del}
still runs under the rtnl_mutex. But it would be nice if it would not
depend on that being the case. So let's introduce a mutex per port (the
address lists are per port too) and share it between dp->mdbs and
dp->fdbs.
The place where we put the locking is interesting. It could be tempting
to put a DSA-level lock which still serializes calls to
.port_fdb_{add,del}, but it would still not avoid concurrency with other
driver code paths that are currently under rtnl_mutex (.port_fdb_dump,
.port_fast_age). So it would add a very false sense of security (and
adding a global switch-wide lock in DSA to resynchronize with the
rtnl_lock is also counterproductive and hard).
So the locking is intentionally done only where the dp->fdbs and dp->mdbs
lists are traversed. That means, from a driver perspective, that
.port_fdb_add will be called with the dp->addr_lists_lock mutex held on
the CPU port, but not held on user ports. This is done so that driver
writers are not encouraged to rely on any guarantee offered by
dp->addr_lists_lock.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
 David S. Miller
|
2d7e73f09f |
Revert "Merge branch 'dsa-rtnl'"
This reverts commit |
||
|
Vladimir Oltean
|
d3bd892437 |
net: dsa: introduce locking for the address lists on CPU and DSA ports
Now that the rtnl_mutex is going away for dsa_port_{host_,}fdb_{add,del},
no one is serializing access to the address lists that DSA keeps for the
purpose of reference counting on shared ports (CPU and cascade ports).
It can happen for one dsa_switch_do_fdb_del to do list_del on a dp->fdbs
element while another dsa_switch_do_fdb_{add,del} is traversing dp->fdbs.
We need to avoid that.
Currently dp->mdbs is not at risk, because dsa_switch_do_mdb_{add,del}
still runs under the rtnl_mutex. But it would be nice if it would not
depend on that being the case. So let's introduce a mutex per port (the
address lists are per port too) and share it between dp->mdbs and
dp->fdbs.
The place where we put the locking is interesting. It could be tempting
to put a DSA-level lock which still serializes calls to
.port_fdb_{add,del}, but it would still not avoid concurrency with other
driver code paths that are currently under rtnl_mutex (.port_fdb_dump,
.port_fast_age). So it would add a very false sense of security (and
adding a global switch-wide lock in DSA to resynchronize with the
rtnl_lock is also counterproductive and hard).
So the locking is intentionally done only where the dp->fdbs and dp->mdbs
lists are traversed. That means, from a driver perspective, that
.port_fdb_add will be called with the dp->addr_lists_lock mutex held on
the CPU port, but not held on user ports. This is done so that driver
writers are not encouraged to rely on any guarantee offered by
dp->addr_lists_lock.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
Vladimir Oltean
|
d0004a020b |
net: dsa: remove the "dsa_to_port in a loop" antipattern from the core
Ever since Vivien's conversion of the ds->ports array into a dst->ports
list, and the introduction of dsa_to_port, iterations through the ports
of a switch became quadratic whenever dsa_to_port was needed.
dsa_to_port can either be called directly, or indirectly through the
dsa_is_{user,cpu,dsa,unused}_port helpers.
Use the newly introduced dsa_switch_for_each_port() iteration macro
that works with the iterator variable being a struct dsa_port *dp
directly, and not an int i. It is an expensive variable to go from i to
dp, but cheap to go from dp to i.
This macro iterates through the entire ds->dst->ports list and filters
by the ports belonging just to the switch provided as argument.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|