[PATCH RESEND 0/4] Use max_sge_rd device capability

[PATCH RESEND 0/4] Use max_sge_rd device capability

[Steve Wise]

Resending because I forgot to cc linux-rdma :(

Some devices were not setting this capability, so fix those devices,
and svcrdma to use max_sge_rd.  Also remove rdma_cap_read_multi_sge()
since it isn't needed.

These patches were originally part of:

http://www.spinics.net/lists/linux-rdma/msg27436.html

They really aren't part of iSER/iWARP at all, so I've split 
them out.  

Bruce: This hits svcrdma, but I suggest they get merged via Doug's tree
to avoid any merge problems.

---

Sagi Grimberg (1):
      mlx4, mlx5, mthca: Expose max_sge_rd correctly

Steve Wise (3):
      RDMA/Core: remove rdma_cap_read_multi_sge() helper
      svcrdma: Use max_sge_rd for destination read depths
      ipath,qib: Expose max_sge_rd correctly


 drivers/infiniband/hw/ipath/ipath_verbs.c    |    1 +
 drivers/infiniband/hw/mlx4/main.c            |    1 +
 drivers/infiniband/hw/mlx5/main.c            |    1 +
 drivers/infiniband/hw/mthca/mthca_provider.c |    1 +
 drivers/infiniband/hw/qib/qib_verbs.c        |    1 +
 include/linux/sunrpc/svc_rdma.h              |    1 +
 include/rdma/ib_verbs.h                      |   28 --------------------------
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c      |   12 +----------
 net/sunrpc/xprtrdma/svc_rdma_transport.c     |    4 ++++
 9 files changed, 11 insertions(+), 39 deletions(-)

-- 

Steve
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[PATCH RESEND 1/4] mlx4, mlx5, mthca: Expose max_sge_rd correctly

[Steve Wise]

From: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Applications must not assume that max_sge and max_sge_rd are the same,
Hence expose max_sge_rd correctly as well.

Reported-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Signed-off-by: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---

 drivers/infiniband/hw/mlx4/main.c            |    1 +
 drivers/infiniband/hw/mlx5/main.c            |    1 +
 drivers/infiniband/hw/mthca/mthca_provider.c |    1 +
 3 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 8be6db8..05166b7 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -229,6 +229,7 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
 	props->max_qp_wr	   = dev->dev->caps.max_wqes - MLX4_IB_SQ_MAX_SPARE;
 	props->max_sge		   = min(dev->dev->caps.max_sq_sg,
 					 dev->dev->caps.max_rq_sg);
+	props->max_sge_rd = props->max_sge;
 	props->max_cq		   = dev->dev->quotas.cq;
 	props->max_cqe		   = dev->dev->caps.max_cqes;
 	props->max_mr		   = dev->dev->quotas.mpt;
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 085c24b..bf27f21 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -273,6 +273,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 		     sizeof(struct mlx5_wqe_ctrl_seg)) /
 		     sizeof(struct mlx5_wqe_data_seg);
 	props->max_sge = min(max_rq_sg, max_sq_sg);
+	props->max_sge_rd = props->max_sge;
 	props->max_cq		   = 1 << MLX5_CAP_GEN(mdev, log_max_cq);
 	props->max_cqe = (1 << MLX5_CAP_GEN(mdev, log_max_eq_sz)) - 1;
 	props->max_mr		   = 1 << MLX5_CAP_GEN(mdev, log_max_mkey);
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index 93ae51d..dc2d48c 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -97,6 +97,7 @@ static int mthca_query_device(struct ib_device *ibdev, struct ib_device_attr *pr
 	props->max_qp              = mdev->limits.num_qps - mdev->limits.reserved_qps;
 	props->max_qp_wr           = mdev->limits.max_wqes;
 	props->max_sge             = mdev->limits.max_sg;
+	props->max_sge_rd          = props->max_sge;
 	props->max_cq              = mdev->limits.num_cqs - mdev->limits.reserved_cqs;
 	props->max_cqe             = mdev->limits.max_cqes;
 	props->max_mr              = mdev->limits.num_mpts - mdev->limits.reserved_mrws;

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[PATCH RESEND 2/4] ipath,qib: Expose max_sge_rd correctly

[Steve Wise]

Applications must not assume that max_sge and max_sge_rd are the same,
Hence expose max_sge_rd correctly as well.

Signed-off-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Acked-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---

 drivers/infiniband/hw/ipath/ipath_verbs.c |    1 +
 drivers/infiniband/hw/qib/qib_verbs.c     |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index 30ba49c..ed2bbc2 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -1521,6 +1521,7 @@ static int ipath_query_device(struct ib_device *ibdev, struct ib_device_attr *pr
 	props->max_qp = ib_ipath_max_qps;
 	props->max_qp_wr = ib_ipath_max_qp_wrs;
 	props->max_sge = ib_ipath_max_sges;
+	props->max_sge_rd = ib_ipath_max_sges;
 	props->max_cq = ib_ipath_max_cqs;
 	props->max_ah = ib_ipath_max_ahs;
 	props->max_cqe = ib_ipath_max_cqes;
diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c
index a05d1a3..bc723b5 100644
--- a/drivers/infiniband/hw/qib/qib_verbs.c
+++ b/drivers/infiniband/hw/qib/qib_verbs.c
@@ -1574,6 +1574,7 @@ static int qib_query_device(struct ib_device *ibdev, struct ib_device_attr *prop
 	props->max_qp = ib_qib_max_qps;
 	props->max_qp_wr = ib_qib_max_qp_wrs;
 	props->max_sge = ib_qib_max_sges;
+	props->max_sge_rd = ib_qib_max_sges;
 	props->max_cq = ib_qib_max_cqs;
 	props->max_ah = ib_qib_max_ahs;
 	props->max_cqe = ib_qib_max_cqes;

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[PATCH RESEND 3/4] svcrdma: Use max_sge_rd for destination read depths

[Steve Wise]

Signed-off-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
---

 include/linux/sunrpc/svc_rdma.h          |    1 +
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   12 +-----------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |    4 ++++
 3 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index cb94ee4..83211bc 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -132,6 +132,7 @@ struct svcxprt_rdma {
 	struct list_head     sc_accept_q;	/* Conn. waiting accept */
 	int		     sc_ord;		/* RDMA read limit */
 	int                  sc_max_sge;
+	int                  sc_max_sge_rd;	/* max sge for read target */
 
 	int                  sc_sq_depth;	/* Depth of SQ */
 	atomic_t             sc_sq_count;	/* Number of SQ WR on queue */
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 2e1348b..cb51742 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -115,15 +115,6 @@ static void rdma_build_arg_xdr(struct svc_rqst *rqstp,
 	rqstp->rq_arg.tail[0].iov_len = 0;
 }
 
-static int rdma_read_max_sge(struct svcxprt_rdma *xprt, int sge_count)
-{
-	if (!rdma_cap_read_multi_sge(xprt->sc_cm_id->device,
-				     xprt->sc_cm_id->port_num))
-		return 1;
-	else
-		return min_t(int, sge_count, xprt->sc_max_sge);
-}
-
 /* Issue an RDMA_READ using the local lkey to map the data sink */
 int rdma_read_chunk_lcl(struct svcxprt_rdma *xprt,
 			struct svc_rqst *rqstp,
@@ -144,8 +135,7 @@ int rdma_read_chunk_lcl(struct svcxprt_rdma *xprt,
 
 	ctxt->direction = DMA_FROM_DEVICE;
 	ctxt->read_hdr = head;
-	pages_needed =
-		min_t(int, pages_needed, rdma_read_max_sge(xprt, pages_needed));
+	pages_needed = min_t(int, pages_needed, xprt->sc_max_sge_rd);
 	read = min_t(int, pages_needed << PAGE_SHIFT, rs_length);
 
 	for (pno = 0; pno < pages_needed; pno++) {
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 6b36279..fdc850f 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -872,6 +872,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 	 * capabilities of this particular device */
 	newxprt->sc_max_sge = min((size_t)devattr.max_sge,
 				  (size_t)RPCSVC_MAXPAGES);
+	newxprt->sc_max_sge_rd = min_t(size_t, devattr.max_sge_rd,
+				       RPCSVC_MAXPAGES);
 	newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr,
 				   (size_t)svcrdma_max_requests);
 	newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests;
@@ -1046,6 +1048,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 		"    remote_ip       : %pI4\n"
 		"    remote_port     : %d\n"
 		"    max_sge         : %d\n"
+		"    max_sge_rd      : %d\n"
 		"    sq_depth        : %d\n"
 		"    max_requests    : %d\n"
 		"    ord             : %d\n",
@@ -1059,6 +1062,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 		ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
 		       route.addr.dst_addr)->sin_port),
 		newxprt->sc_max_sge,
+		newxprt->sc_max_sge_rd,
 		newxprt->sc_sq_depth,
 		newxprt->sc_max_requests,
 		newxprt->sc_ord);

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[PATCH RESEND 4/4] RDMA/Core: remove rdma_cap_read_multi_sge() helper

[Steve Wise]

This functionality already exists via the max_sge_rd
device capability.

Signed-off-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
---

 include/rdma/ib_verbs.h |   28 ----------------------------
 1 files changed, 0 insertions(+), 28 deletions(-)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index b0f898e..7448a27 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2071,34 +2071,6 @@ static inline bool rdma_cap_eth_ah(const struct ib_device *device, u8 port_num)
 }
 
 /**
- * rdma_cap_read_multi_sge - Check if the port of device has the capability
- * RDMA Read Multiple Scatter-Gather Entries.
- * @device: Device to check
- * @port_num: Port number to check
- *
- * iWARP has a restriction that RDMA READ requests may only have a single
- * Scatter/Gather Entry (SGE) in the work request.
- *
- * NOTE: although the linux kernel currently assumes all devices are either
- * single SGE RDMA READ devices or identical SGE maximums for RDMA READs and
- * WRITEs, according to Tom Talpey, this is not accurate.  There are some
- * devices out there that support more than a single SGE on RDMA READ
- * requests, but do not support the same number of SGEs as they do on
- * RDMA WRITE requests.  The linux kernel would need rearchitecting to
- * support these imbalanced READ/WRITE SGEs allowed devices.  So, for now,
- * suffice with either the device supports the same READ/WRITE SGEs, or
- * it only gets one READ sge.
- *
- * Return: true for any device that allows more than one SGE in RDMA READ
- * requests.
- */
-static inline bool rdma_cap_read_multi_sge(struct ib_device *device,
-					   u8 port_num)
-{
-	return !(device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_PROT_IWARP);
-}
-
-/**
  * rdma_max_mad_size - Return the max MAD size required by this RDMA Port.
  *
  * @device: Device

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Re: [PATCH RESEND 0/4] Use max_sge_rd device capability

[Jason Gunthorpe]

On Mon, Jul 27, 2015 at 06:09:55PM -0500, Steve Wise wrote:
> Resending because I forgot to cc linux-rdma :(

All looks sane to me:

Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>

Thanks,
Jason
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Re: [PATCH RESEND 0/4] Use max_sge_rd device capability

[ira.weiny]

On Mon, Jul 27, 2015 at 06:09:55PM -0500, Steve Wise wrote:
> Resending because I forgot to cc linux-rdma :(
> 
> Some devices were not setting this capability, so fix those devices,
> and svcrdma to use max_sge_rd.  Also remove rdma_cap_read_multi_sge()
> since it isn't needed.
> 
> These patches were originally part of:
> 
> http://www.spinics.net/lists/linux-rdma/msg27436.html
> 
> They really aren't part of iSER/iWARP at all, so I've split 
> them out.  
> 
> Bruce: This hits svcrdma, but I suggest they get merged via Doug's tree
> to avoid any merge problems.

Looks good to me.  Thanks for cleaning this cap helper up.

Reviewed-by: Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

> 
> ---
> 
> Sagi Grimberg (1):
>       mlx4, mlx5, mthca: Expose max_sge_rd correctly
> 
> Steve Wise (3):
>       RDMA/Core: remove rdma_cap_read_multi_sge() helper
>       svcrdma: Use max_sge_rd for destination read depths
>       ipath,qib: Expose max_sge_rd correctly
> 
> 
>  drivers/infiniband/hw/ipath/ipath_verbs.c    |    1 +
>  drivers/infiniband/hw/mlx4/main.c            |    1 +
>  drivers/infiniband/hw/mlx5/main.c            |    1 +
>  drivers/infiniband/hw/mthca/mthca_provider.c |    1 +
>  drivers/infiniband/hw/qib/qib_verbs.c        |    1 +
>  include/linux/sunrpc/svc_rdma.h              |    1 +
>  include/rdma/ib_verbs.h                      |   28 --------------------------
>  net/sunrpc/xprtrdma/svc_rdma_recvfrom.c      |   12 +----------
>  net/sunrpc/xprtrdma/svc_rdma_transport.c     |    4 ++++
>  9 files changed, 11 insertions(+), 39 deletions(-)
> 
> -- 
> 
> Steve
> --
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Re: [PATCH RESEND 0/4] Use max_sge_rd device capability

[Sagi Grimberg]

On 7/28/2015 2:09 AM, Steve Wise wrote:
> Resending because I forgot to cc linux-rdma :(
>
> Some devices were not setting this capability, so fix those devices,
> and svcrdma to use max_sge_rd.  Also remove rdma_cap_read_multi_sge()
> since it isn't needed.
>
> These patches were originally part of:
>
> http://www.spinics.net/lists/linux-rdma/msg27436.html
>
> They really aren't part of iSER/iWARP at all, so I've split
> them out.
>
> Bruce: This hits svcrdma, but I suggest they get merged via Doug's tree
> to avoid any merge problems.
>
> ---

Looks good,

Reviewed-by: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
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Re: [PATCH RESEND 0/4] Use max_sge_rd device capability

[J. Bruce Fields]

On Mon, Jul 27, 2015 at 06:09:55PM -0500, Steve Wise wrote:
> Resending because I forgot to cc linux-rdma :(
> 
> Some devices were not setting this capability, so fix those devices,
> and svcrdma to use max_sge_rd.  Also remove rdma_cap_read_multi_sge()
> since it isn't needed.
> 
> These patches were originally part of:
> 
> http://www.spinics.net/lists/linux-rdma/msg27436.html
> 
> They really aren't part of iSER/iWARP at all, so I've split 
> them out.  
> 
> Bruce: This hits svcrdma, but I suggest they get merged via Doug's tree
> to avoid any merge problems.

Sounds fine.  I've got some changes to those files in my for-next as
well, but they don't appear to conflict.

Feel free to add my

	Acked-by: J. Bruce Fields <bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

to patch 3/4 if it helps.

--b.

> 
> ---
> 
> Sagi Grimberg (1):
>       mlx4, mlx5, mthca: Expose max_sge_rd correctly
> 
> Steve Wise (3):
>       RDMA/Core: remove rdma_cap_read_multi_sge() helper
>       svcrdma: Use max_sge_rd for destination read depths
>       ipath,qib: Expose max_sge_rd correctly
> 
> 
>  drivers/infiniband/hw/ipath/ipath_verbs.c    |    1 +
>  drivers/infiniband/hw/mlx4/main.c            |    1 +
>  drivers/infiniband/hw/mlx5/main.c            |    1 +
>  drivers/infiniband/hw/mthca/mthca_provider.c |    1 +
>  drivers/infiniband/hw/qib/qib_verbs.c        |    1 +
>  include/linux/sunrpc/svc_rdma.h              |    1 +
>  include/rdma/ib_verbs.h                      |   28 --------------------------
>  net/sunrpc/xprtrdma/svc_rdma_recvfrom.c      |   12 +----------
>  net/sunrpc/xprtrdma/svc_rdma_transport.c     |    4 ++++
>  9 files changed, 11 insertions(+), 39 deletions(-)
> 
> -- 
> 
> Steve
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Re: [PATCH RESEND 0/4] Use max_sge_rd device capability

[Doug Ledford]

[-- Attachment #1: Type: text/plain, Size: 1657 bytes --]

On 07/27/2015 07:09 PM, Steve Wise wrote:
> Resending because I forgot to cc linux-rdma :(
> 
> Some devices were not setting this capability, so fix those devices,
> and svcrdma to use max_sge_rd.  Also remove rdma_cap_read_multi_sge()
> since it isn't needed.
> 
> These patches were originally part of:
> 
> http://www.spinics.net/lists/linux-rdma/msg27436.html
> 
> They really aren't part of iSER/iWARP at all, so I've split 
> them out.  
> 
> Bruce: This hits svcrdma, but I suggest they get merged via Doug's tree
> to avoid any merge problems.
> 
> ---
> 
> Sagi Grimberg (1):
>       mlx4, mlx5, mthca: Expose max_sge_rd correctly
> 
> Steve Wise (3):
>       RDMA/Core: remove rdma_cap_read_multi_sge() helper
>       svcrdma: Use max_sge_rd for destination read depths
>       ipath,qib: Expose max_sge_rd correctly
> 
> 
>  drivers/infiniband/hw/ipath/ipath_verbs.c    |    1 +
>  drivers/infiniband/hw/mlx4/main.c            |    1 +
>  drivers/infiniband/hw/mlx5/main.c            |    1 +
>  drivers/infiniband/hw/mthca/mthca_provider.c |    1 +
>  drivers/infiniband/hw/qib/qib_verbs.c        |    1 +
>  include/linux/sunrpc/svc_rdma.h              |    1 +
>  include/rdma/ib_verbs.h                      |   28 --------------------------
>  net/sunrpc/xprtrdma/svc_rdma_recvfrom.c      |   12 +----------
>  net/sunrpc/xprtrdma/svc_rdma_transport.c     |    4 ++++
>  9 files changed, 11 insertions(+), 39 deletions(-)
> 

Thanks Steve, I'm picking this up for my for-next work today.

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



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