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authorDirk van der Merwe <dirk.vandermerwe@netronome.com>2018-04-03 17:24:23 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-12 12:30:01 +0200
commit87d1acd833dfee77dbe927bdb2099628129308ba (patch)
tree0b97233769502b8192958accafc2b0155b4751da
parentd0fd3e03df3f139b2eb46368ba6064d8d0c460a8 (diff)
nfp: use full 40 bits of the NSP buffer address
[ Upstream commit 1489bbd10e16079ce30a53d3c22a431fd47af791 ] The NSP default buffer is a piece of NFP memory where additional command data can be placed. Its format has been copied from host buffer, but the PCIe selection bits do not make sense in this case. If those get masked out from a NFP address - writes to random place in the chip memory may be issued and crash the device. Even in the general NSP buffer case, it doesn't make sense to have the PCIe selection bits there anymore. These are unused at the moment, and when it becomes necessary, the PCIe selection bits should rather be moved to another register to utilise more bits for the buffer address. This has never been an issue because the buffer used to be allocated in memory with less-than-38-bit-long address but that is about to change. Fixes: 1a64821c6af7 ("nfp: add support for service processor access") Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
index 39abac678b71..99bb679a9801 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -71,10 +71,11 @@
/* CPP address to retrieve the data from */
#define NSP_BUFFER 0x10
#define NSP_BUFFER_CPP GENMASK_ULL(63, 40)
-#define NSP_BUFFER_PCIE GENMASK_ULL(39, 38)
-#define NSP_BUFFER_ADDRESS GENMASK_ULL(37, 0)
+#define NSP_BUFFER_ADDRESS GENMASK_ULL(39, 0)
#define NSP_DFLT_BUFFER 0x18
+#define NSP_DFLT_BUFFER_CPP GENMASK_ULL(63, 40)
+#define NSP_DFLT_BUFFER_ADDRESS GENMASK_ULL(39, 0)
#define NSP_DFLT_BUFFER_CONFIG 0x20
#define NSP_DFLT_BUFFER_SIZE_MB GENMASK_ULL(7, 0)
@@ -427,8 +428,8 @@ __nfp_nsp_command_buf(struct nfp_nsp *nsp, u16 code, u32 option,
if (err < 0)
return err;
- cpp_id = FIELD_GET(NSP_BUFFER_CPP, reg) << 8;
- cpp_buf = FIELD_GET(NSP_BUFFER_ADDRESS, reg);
+ cpp_id = FIELD_GET(NSP_DFLT_BUFFER_CPP, reg) << 8;
+ cpp_buf = FIELD_GET(NSP_DFLT_BUFFER_ADDRESS, reg);
if (in_buf && in_size) {
err = nfp_cpp_write(cpp, cpp_id, cpp_buf, in_buf, in_size);