diff options
author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2018-01-18 05:51:01 +0300 |
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committer | David S. Miller <davem@davemloft.net> | 2018-01-19 23:44:18 +0300 |
commit | 73a0329b057e9a7ac3e6eead208e7de056d13c9a (patch) | |
tree | d0a181d15fb961fa02c80555708759f1663845a8 /drivers/net/ethernet/netronome/nfp/nfp_net.h | |
parent | bf245f1fb085a17f93739452f017f9107d035a7e (diff) | |
download | linux-73a0329b057e9a7ac3e6eead208e7de056d13c9a.tar.xz |
nfp: add TLV capabilities to the BAR
NFP is entirely programmable, including the PCI data interface.
Using a fixed control BAR layout certainly makes implementations
easier, but require careful considerations when space is allocated.
Once BAR area is allocated to one feature nothing else can use it.
Allocating space statically also requires it to be sized upfront,
which leads to either unnecessary limitation or wastage.
We currently have a 32bit capability word defined which tells drivers
which application FW features are supported. Most of the bits
are exhausted. The same bits are also reused for enabling specific
features. Bulk of capabilities don't have a need for an enable bit,
however, leading to confusion and wastage.
TLVs seems like a better fit for expressing capabilities of applications
running on programmable hardware.
This patch leaves the front of the BAR as is, and declares a TLV
capability start at offset 0x58. Most of the space up to 0x0d90
is already allocated, but the used space can be wrapped with RESERVED
TLVs. E.g.:
Address Type Length
0x0058 RESERVED 0xe00 /* Wrap basic structures */
0x0e5c FEATURE_A 0x004
0x0e64 FEATURE_B 0x004
0x0e6c RESERVED 0x990 /* Wrap qeueue stats */
0x1800 FEATURE_C 0x100
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/nfp_net.h')
-rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfp_net.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h index 6f6e3d6fd935..d88eda9707e6 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net.h +++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h @@ -578,6 +578,7 @@ struct nfp_net_dp { * @qcp_cfg: Pointer to QCP queue used for configuration notification * @tx_bar: Pointer to mapped TX queues * @rx_bar: Pointer to mapped FL/RX queues + * @tlv_caps: Parsed TLV capabilities * @debugfs_dir: Device directory in debugfs * @vnic_list: Entry on device vNIC list * @pdev: Backpointer to PCI device @@ -644,6 +645,8 @@ struct nfp_net { u8 __iomem *tx_bar; u8 __iomem *rx_bar; + struct nfp_net_tlv_caps tlv_caps; + struct dentry *debugfs_dir; struct list_head vnic_list; |