[v1] libibverbs: Add support for checksum offload

[v1] libibverbs: Add support for checksum offload

[wbd2905-Re5JQEeQqe8AvxtiuMwx3w]

From: Bodong Wang <bodong-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Changes from v1:
 * Use the CSUM caps from device_cap_flags rather than defining new fileds

Bodong Wang (1):
  libibverbs: Report checksum offload capabilities

 include/infiniband/verbs.h | 14 ++++++++++++--
 man/ibv_poll_cq.3          |  5 +++++
 man/ibv_post_send.3        |  4 ++++
 3 files changed, 21 insertions(+), 2 deletions(-)

-- 
1.8.3.1

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[v1] libibverbs: Report checksum offload capabilities

[wbd2905-Re5JQEeQqe8AvxtiuMwx3w]

From: Bodong Wang <bodong-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Add IBV_DEVICE_UD_IP_CSUM, IBV_DEVICE_RAW_IP_CSUM and IBV_DEVICE_RC_IP_CSUM to
device capability enum field. These enum will denote IPv4 checksum offload
support for UD, RAW and RC QPs.

Flags IBV_SEND_IP_CSUM and IBV_WC_IP_CSUM_OK are added for utilizing this
capability for send and receive separately.

Signed-off-by: Bodong Wang <bodong-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
 include/infiniband/verbs.h | 14 ++++++++++++--
 man/ibv_poll_cq.3          |  5 +++++
 man/ibv_post_send.3        |  4 ++++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/include/infiniband/verbs.h b/include/infiniband/verbs.h
index 1ff5265..ae22768 100644
--- a/include/infiniband/verbs.h
+++ b/include/infiniband/verbs.h
@@ -116,7 +116,10 @@ enum ibv_device_cap_flags {
 	IBV_DEVICE_RC_RNR_NAK_GEN	= 1 << 12,
 	IBV_DEVICE_SRQ_RESIZE		= 1 << 13,
 	IBV_DEVICE_N_NOTIFY_CQ		= 1 << 14,
+	IBV_DEVICE_UD_IP_CSUM		= 1 << 18,
 	IBV_DEVICE_XRC			= 1 << 20,
+	IBV_DEVICE_RC_IP_CSUM		= 1 << 25,
+	IBV_DEVICE_RAW_IP_CSUM		= 1 << 26,
 	IBV_DEVICE_MANAGED_FLOW_STEERING = 1 << 29
 };
 
@@ -348,9 +351,14 @@ enum ibv_wc_opcode {
 	IBV_WC_RECV_RDMA_WITH_IMM
 };
 
+enum {
+	IBV_WC_IP_CSUM_OK_SHIFT	= 2
+};
+
 enum ibv_wc_flags {
 	IBV_WC_GRH		= 1 << 0,
-	IBV_WC_WITH_IMM		= 1 << 1
+	IBV_WC_WITH_IMM		= 1 << 1,
+	IBV_WC_IP_CSUM_OK	= 1 << IBV_WC_IP_CSUM_OK_SHIFT
 };
 
 struct ibv_wc {
@@ -688,7 +696,8 @@ enum ibv_send_flags {
 	IBV_SEND_FENCE		= 1 << 0,
 	IBV_SEND_SIGNALED	= 1 << 1,
 	IBV_SEND_SOLICITED	= 1 << 2,
-	IBV_SEND_INLINE		= 1 << 3
+	IBV_SEND_INLINE		= 1 << 3,
+	IBV_SEND_IP_CSUM	= 1 << 4
 };
 
 struct ibv_sge {
@@ -1459,6 +1468,7 @@ ibv_query_device_ex(struct ibv_context *context,
 legacy:
 	memset(attr, 0, sizeof(*attr));
 	ret = ibv_query_device(context, &attr->orig_attr);
+
 	return ret;
 }
 
diff --git a/man/ibv_poll_cq.3 b/man/ibv_poll_cq.3
index 57c6daa..bbf48ff 100644
--- a/man/ibv_poll_cq.3
+++ b/man/ibv_poll_cq.3
@@ -50,6 +50,11 @@ It is either 0 or the bitwise OR of one or more of the following flags:
 .B IBV_WC_GRH \fR      GRH is present (valid only for UD QPs)
 .TP
 .B IBV_WC_WITH_IMM \fR Immediate data value is valid
+.TP
+.B IBV_WC_IP_CSUM_OK \fR TCP/UDP checksum over IPv4 and IPv4 header checksum are
+verified.
+Valid only when \fBdevice_cap_flags\fR in device_attr indicates current QP is
+supported by checksum offload.
 .PP
 Not all
 .I wc
diff --git a/man/ibv_post_send.3 b/man/ibv_post_send.3
index 33fbb50..eeea078 100644
--- a/man/ibv_post_send.3
+++ b/man/ibv_post_send.3
@@ -98,6 +98,10 @@ The attribute send_flags describes the properties of the \s-1WR\s0. It is either
 .TP
 .B IBV_SEND_INLINE \fR Send data in given gather list as inline data
 in a send WQE.  Valid only for Send and RDMA Write.  The L_Key will not be checked.
+.TP
+.B IBV_SEND_IP_CSUM \fR Offload the IPv4 and TCP/UDP checksum calculation.
+Valid only when \fBdevice_cap_flags\fR in device_attr indicates current QP is
+supported by checksum offload.
 .SH "RETURN VALUE"
 .B ibv_post_send()
 returns 0 on success, or the value of errno on failure (which indicates the failure reason).
-- 
1.8.3.1

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Re: [v1] libibverbs: Add support for checksum offload

[Doug Ledford]

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On 09/22/2015 04:20 PM, wbd2905-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> From: Bodong Wang <bodong-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> 
> Changes from v1:
>  * Use the CSUM caps from device_cap_flags rather than defining new fileds
> 
> Bodong Wang (1):
>   libibverbs: Report checksum offload capabilities
> 
>  include/infiniband/verbs.h | 14 ++++++++++++--
>  man/ibv_poll_cq.3          |  5 +++++
>  man/ibv_post_send.3        |  4 ++++
>  3 files changed, 21 insertions(+), 2 deletions(-)
> 

Thanks, applied.

-- 
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
              GPG KeyID: 0E572FDD



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