Eli Cohen wrote:
Add checksum offload support to the core
A device that publishes IB_DEVICE_IP_CSUM actually supports
calculating checksum on transmit and provides indication whether
the checksum is OK on receive.
Hi Eli,
From the discussion over the "IB/ipoib: S/G and HW checksum support"
thread, I understand that Linux actually never offloads the IP checksum
calculation to the HW but rather only the TCP and UDP checksum.
I find it more clear if the device capability (same for the send flag)
name would follow one of these:
#define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
#define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack.
*/
#define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
#define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
Or.
Index: ofa_1_3_dev_kernel/include/rdma/ib_verbs.h
enum ib_cq_notify_flags {
@@ -615,7 +617,9 @@ enum ib_send_flags {
IB_SEND_FENCE = 1,
IB_SEND_SIGNALED = (1<<1),
IB_SEND_SOLICITED = (1<<2),
- IB_SEND_INLINE = (1<<3)
+ IB_SEND_INLINE = (1<<3),
+ IB_SEND_IP_CSUM = (1<<4),
there's no point for the HW to compute the IP csum, asking this is a
pure waste, since the stack always does it
+ IB_SEND_UDP_TCP_CSUM = (1<<5)
};
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