| Message ID | AS8PR02MB7237E2900247571C9CB84C678B022@AS8PR02MB7237.eurprd02.prod.outlook.com (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | bfec4e18f94351d2ff9073c4bffcc6f37bfa3e0b |
| Headers | show |
| Series | RDMA/mana_ib: Add flex array to struct mana_cfg_rx_steer_req_v2 | expand |
> Subject: [PATCH v3 1/3] net: mana: Add flex array to struct > mana_cfg_rx_steer_req_v2 > > The "struct mana_cfg_rx_steer_req_v2" uses a dynamically sized set of trailing > elements. Specifically, it uses a "mana_handle_t" array. So, use the preferred way > in the kernel declaring a flexible array [1]. > > At the same time, prepare for the coming implementation by GCC and Clang of > the __counted_by attribute. Flexible array members annotated with > __counted_by can have their accesses bounds-checked at run-time via > CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE > (for strcpy/memcpy-family functions). > > This is a previous step to refactor the two consumers of this structure. > > drivers/infiniband/hw/mana/qp.c > drivers/net/ethernet/microsoft/mana/mana_en.c > > The ultimate goal is to avoid the open-coded arithmetic in the memory allocator > functions [2] using the "struct_size" macro. > > Link: > https://www.ker/ > nel.org%2Fdoc%2Fhtml%2Fnext%2Fprocess%2Fdeprecated.html%23zero-length- > and-one-element- > arrays&data=05%7C02%7Clongli%40microsoft.com%7Ce75134553ebf4bca87bd0 > 8dc564acf8e%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C63848012 > 6558204741%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV > 2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=%2B8k08 > SWrKXJiDfQ2cal65b1K1sElRB8x0oA5EFeUqbw%3D&reserved=0 [1] > Link: > https://www.ker/ > nel.org%2Fdoc%2Fhtml%2Fnext%2Fprocess%2Fdeprecated.html%23open-coded- > arithmetic-in-allocator- > arguments&data=05%7C02%7Clongli%40microsoft.com%7Ce75134553ebf4bca8 > 7bd08dc564acf8e%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C6384 > 80126558211762%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJ > QIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=h0 > wsUICWnJwn1Nd5fr%2B0z8SXZIqXQrNWKTEbVlB%2BNI0%3D&reserved=0 [2] > Signed-off-by: Erick Archer <erick.archer@outlook.com> Reviewed-by: Long Li <longli@microsoft.com>
Hi, On Sat, Apr 06, 2024 at 04:23:35PM +0200, Erick Archer wrote: > The "struct mana_cfg_rx_steer_req_v2" uses a dynamically sized set of > trailing elements. Specifically, it uses a "mana_handle_t" array. So, > use the preferred way in the kernel declaring a flexible array [1]. > > At the same time, prepare for the coming implementation by GCC and Clang > of the __counted_by attribute. Flexible array members annotated with > __counted_by can have their accesses bounds-checked at run-time via > CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for > strcpy/memcpy-family functions). > > This is a previous step to refactor the two consumers of this structure. > > drivers/infiniband/hw/mana/qp.c > drivers/net/ethernet/microsoft/mana/mana_en.c > > The ultimate goal is to avoid the open-coded arithmetic in the memory > allocator functions [2] using the "struct_size" macro. > > Link: https://www.kernel.org/doc/html/next/process/deprecated.html#zero-length-and-one-element-arrays [1] > Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [2] > Signed-off-by: Erick Archer <erick.archer@outlook.com> I think this could have all been one patch, I found myself jumping around the three patches here piecing together context. Reviewed-by: Justin Stitt <justinstitt@google.com> > --- > include/net/mana/mana.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h > index 4eeedf14711b..561f6719fb4e 100644 > --- a/include/net/mana/mana.h > +++ b/include/net/mana/mana.h > @@ -670,6 +670,7 @@ struct mana_cfg_rx_steer_req_v2 { > u8 hashkey[MANA_HASH_KEY_SIZE]; > u8 cqe_coalescing_enable; > u8 reserved2[7]; > + mana_handle_t indir_tab[] __counted_by(num_indir_entries); > }; /* HW DATA */ > > struct mana_cfg_rx_steer_resp { > -- > 2.25.1 > Thanks Justin
On Mon, Apr 8, 2024 at 2:35 PM Justin Stitt <justinstitt@google.com> wrote: > > Hi, > > On Sat, Apr 06, 2024 at 04:23:35PM +0200, Erick Archer wrote: > > The "struct mana_cfg_rx_steer_req_v2" uses a dynamically sized set of > > trailing elements. Specifically, it uses a "mana_handle_t" array. So, > > use the preferred way in the kernel declaring a flexible array [1]. > > > > At the same time, prepare for the coming implementation by GCC and Clang > > of the __counted_by attribute. Flexible array members annotated with > > __counted_by can have their accesses bounds-checked at run-time via > > CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for > > strcpy/memcpy-family functions). > > > > This is a previous step to refactor the two consumers of this structure. > > > > drivers/infiniband/hw/mana/qp.c > > drivers/net/ethernet/microsoft/mana/mana_en.c > > > > The ultimate goal is to avoid the open-coded arithmetic in the memory > > allocator functions [2] using the "struct_size" macro. > > > > Link: https://www.kernel.org/doc/html/next/process/deprecated.html#zero-length-and-one-element-arrays [1] > > Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [2] > > Signed-off-by: Erick Archer <erick.archer@outlook.com> > > I think this could have all been one patch, I found myself jumping > around the three patches here piecing together context. I now see Leon said to combine them in v2. Whoops, sorry to give conflicting feedback. > > Reviewed-by: Justin Stitt <justinstitt@google.com> > > > --- > > include/net/mana/mana.h | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h > > index 4eeedf14711b..561f6719fb4e 100644 > > --- a/include/net/mana/mana.h > > +++ b/include/net/mana/mana.h > > @@ -670,6 +670,7 @@ struct mana_cfg_rx_steer_req_v2 { > > u8 hashkey[MANA_HASH_KEY_SIZE]; > > u8 cqe_coalescing_enable; > > u8 reserved2[7]; > > + mana_handle_t indir_tab[] __counted_by(num_indir_entries); > > }; /* HW DATA */ > > > > struct mana_cfg_rx_steer_resp { > > -- > > 2.25.1 > > > > Thanks > Justin
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h index 4eeedf14711b..561f6719fb4e 100644 --- a/include/net/mana/mana.h +++ b/include/net/mana/mana.h @@ -670,6 +670,7 @@ struct mana_cfg_rx_steer_req_v2 { u8 hashkey[MANA_HASH_KEY_SIZE]; u8 cqe_coalescing_enable; u8 reserved2[7]; + mana_handle_t indir_tab[] __counted_by(num_indir_entries); }; /* HW DATA */ struct mana_cfg_rx_steer_resp {
The "struct mana_cfg_rx_steer_req_v2" uses a dynamically sized set of trailing elements. Specifically, it uses a "mana_handle_t" array. So, use the preferred way in the kernel declaring a flexible array [1]. At the same time, prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). This is a previous step to refactor the two consumers of this structure. drivers/infiniband/hw/mana/qp.c drivers/net/ethernet/microsoft/mana/mana_en.c The ultimate goal is to avoid the open-coded arithmetic in the memory allocator functions [2] using the "struct_size" macro. Link: https://www.kernel.org/doc/html/next/process/deprecated.html#zero-length-and-one-element-arrays [1] Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [2] Signed-off-by: Erick Archer <erick.archer@outlook.com> --- include/net/mana/mana.h | 1 + 1 file changed, 1 insertion(+)