net: mana: Add support for jumbo frame

During probe, get the hardware-allowed max MTU by querying the device
configuration. Users can select MTU up to the device limit.
When XDP is in use, limit MTU settings so the buffer size is within
one page. And, when MTU is set to a too large value, XDP is not allowed
to run.
Also, to prevent changing MTU fails, and leaves the NIC in a bad state,
pre-allocate all buffers before starting the change. So in low memory
condition, it will return error, without affecting the NIC.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index fee99d704281..cd386aa7c7cc 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -37,6 +37,7 @@ enum TRI_STATE {
 #define COMP_ENTRY_SIZE 64
 
 #define RX_BUFFERS_PER_QUEUE 512
+#define MANA_RX_DATA_ALIGN 64
 
 #define MAX_SEND_BUFFERS_PER_QUEUE 256
 
@@ -390,6 +391,14 @@ struct mana_port_context {
 	/* This points to an array of num_queues of RQ pointers. */
 	struct mana_rxq **rxqs;
 
+	/* pre-allocated rx buffer array */
+	void **rxbufs_pre;
+	dma_addr_t *das_pre;
+	int rxbpre_total;
+	u32 rxbpre_datasize;
+	u32 rxbpre_alloc_size;
+	u32 rxbpre_headroom;
+
 	struct bpf_prog *bpf_prog;
 
 	/* Create num_queues EQs, SQs, SQ-CQs, RQs and RQ-CQs, respectively. */
@@ -489,6 +498,11 @@ struct mana_query_device_cfg_resp {
 	u16 max_num_vports;
 	u16 reserved;
 	u32 max_num_eqs;
+
+	/* response v2: */
+	u16 adapter_mtu;
+	u16 reserved2;
+	u32 reserved3;
 }; /* HW DATA */
 
 /* Query vPort Configuration */