On Wed, Mar 05, 2025 at 01:46:21PM -0800, Haiyang Zhang wrote:
According to GDMA protocol, holes (zeros) are allowed at the beginning or middle of the gdma_list_devices_resp message. The existing code cannot properly handle this, and may miss some devices in the list.
To fix, scan the entire list until the num_of_devs are found, or until the end of the list.
Cc: stable@vger.kernel.org Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)") Signed-off-by: Haiyang Zhang haiyangz@microsoft.com
drivers/net/ethernet/microsoft/mana/gdma_main.c | 16 ++++++++++++---- include/net/mana/gdma.h | 11 +++++++---- 2 files changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c index c15a5ef4674e..df3ab31974b1 100644 --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c @@ -134,9 +134,10 @@ static int mana_gd_detect_devices(struct pci_dev *pdev) struct gdma_list_devices_resp resp = {}; struct gdma_general_req req = {}; struct gdma_dev_id dev;
- u32 i, max_num_devs;
- int found_dev = 0; u16 dev_type; int err;
- u32 i;
mana_gd_init_req_hdr(&req.hdr, GDMA_LIST_DEVICES, sizeof(req), sizeof(resp)); @@ -148,12 +149,19 @@ static int mana_gd_detect_devices(struct pci_dev *pdev) return err ? err : -EPROTO; }
- max_num_devs = min_t(u32, MAX_NUM_GDMA_DEVICES, resp.num_of_devs);
- for (i = 0; i < max_num_devs; i++) {
- for (i = 0; i < GDMA_DEV_LIST_SIZE &&
found_dev < resp.num_of_devs; i++) {
/* Skip empty devices */if (dev.as_uint32 == 0)continue;found_dev++;dev_info(gc->dev, "Got devidx:%u, type:%u, instance:%u\n", i,dev.type, dev.instance);- /* HWC is already detected in mana_hwc_create_channel(). */ if (dev_type == GDMA_DEVICE_HWC) continue;
diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h index 90f56656b572..62e9d7673862 100644 --- a/include/net/mana/gdma.h +++ b/include/net/mana/gdma.h @@ -408,8 +408,6 @@ struct gdma_context { struct gdma_dev mana_ib; }; -#define MAX_NUM_GDMA_DEVICES 4
static inline bool mana_gd_is_mana(struct gdma_dev *gd) { return gd->dev_id.type == GDMA_DEVICE_MANA; @@ -556,11 +554,15 @@ enum { #define GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG BIT(3) #define GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT BIT(5) +/* Driver can handle holes (zeros) in the device list */ +#define GDMA_DRV_CAP_FLAG_1_DEV_LIST_HOLES_SUP BIT(11)
#define GDMA_DRV_CAP_FLAGS1 \ (GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT | \ GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX | \ GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG | \
GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT)
GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT | \GDMA_DRV_CAP_FLAG_1_DEV_LIST_HOLES_SUP)#define GDMA_DRV_CAP_FLAGS2 0 @@ -621,11 +623,12 @@ struct gdma_query_max_resources_resp { }; /* HW DATA */ /* GDMA_LIST_DEVICES */ +#define GDMA_DEV_LIST_SIZE 64 struct gdma_list_devices_resp { struct gdma_resp_hdr hdr; u32 num_of_devs; u32 reserved;
- struct gdma_dev_id devs[64];
- struct gdma_dev_id devs[GDMA_DEV_LIST_SIZE];
}; /* HW DATA */ /* GDMA_REGISTER_DEVICE */
Reviewed-by: Shradha Gupta shradhagupta@microsoft.com
-- 2.34.1