[PATCH for-next 02/12] IB/hfi1: Convert the macro AHG_HEADER_SET into an inline function

Dennis Dalessandro
2017-09-26T14:00:11Z

From: Harish Chegondi <harish.chegondi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

AHG_HEADER_SET macro doesn't conform to the coding standards as it can
affect the control flow. Convert the macro AHG_HEADER_SET into an inline
function ahg_header_set().

Cc: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Harish Chegondi <harish.chegondi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
drivers/infiniband/hw/hfi1/user_sdma.c | 58 ++++++++++++++++++++++----------
drivers/infiniband/hw/hfi1/user_sdma.h | 29 +++++++++++-----
2 files changed, 59 insertions(+), 28 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c
index c0c0e04..4ea29ed 100644
--- a/drivers/infiniband/hw/hfi1/user_sdma.c
+++ b/drivers/infiniband/hw/hfi1/user_sdma.c
@@ -1254,20 +1254,25 @@ static int set_txreq_header_ahg(struct user_sdma_request *req,
struct user_sdma_txreq *tx, u32 datalen)
{
u32 ahg[AHG_KDETH_ARRAY_SIZE];
- int diff = 0;
+ int idx = 0;
u8 omfactor; /* KDETH.OM */
struct hfi1_user_sdma_pkt_q *pq = req->pq;
struct hfi1_pkt_header *hdr = &req->hdr;
u16 pbclen = le16_to_cpu(hdr->pbc[0]);
u32 val32, tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
+ size_t array_size = ARRAY_SIZE(ahg);

if (PBC2LRH(pbclen) != lrhlen) {
/* PBC.PbcLengthDWs */
- AHG_HEADER_SET(ahg, diff, 0, 0, 12,
- cpu_to_le16(LRH2PBC(lrhlen)));
+ idx = ahg_header_set(ahg, idx, array_size, 0, 0, 12,
+ (__force u16)cpu_to_le16(LRH2PBC(lrhlen)));
+ if (idx < 0)
+ return idx;
/* LRH.PktLen (we need the full 16 bits due to byte swap) */
- AHG_HEADER_SET(ahg, diff, 3, 0, 16,
- cpu_to_be16(lrhlen >> 2));
+ idx = ahg_header_set(ahg, idx, array_size, 3, 0, 16,
+ (__force u16)cpu_to_be16(lrhlen >> 2));
+ if (idx < 0)
+ return idx;
}

/*
@@ -1278,12 +1283,23 @@ static int set_txreq_header_ahg(struct user_sdma_request *req,
(HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffff : 0xffffff);
if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
val32 |= 1UL << 31;
- AHG_HEADER_SET(ahg, diff, 6, 0, 16, cpu_to_be16(val32 >> 16));
- AHG_HEADER_SET(ahg, diff, 6, 16, 16, cpu_to_be16(val32 & 0xffff));
+ idx = ahg_header_set(ahg, idx, array_size, 6, 0, 16,
+ (__force u16)cpu_to_be16(val32 >> 16));
+ if (idx < 0)
+ return idx;
+ idx = ahg_header_set(ahg, idx, array_size, 6, 16, 16,
+ (__force u16)cpu_to_be16(val32 & 0xffff));
+ if (idx < 0)
+ return idx;
/* KDETH.Offset */
- AHG_HEADER_SET(ahg, diff, 15, 0, 16,
- cpu_to_le16(req->koffset & 0xffff));
- AHG_HEADER_SET(ahg, diff, 15, 16, 16, cpu_to_le16(req->koffset >> 16));
+ idx = ahg_header_set(ahg, idx, array_size, 15, 0, 16,
+ (__force u16)cpu_to_le16(req->koffset & 0xffff));
+ if (idx < 0)
+ return idx;
+ idx = ahg_header_set(ahg, idx, array_size, 15, 16, 16,
+ (__force u16)cpu_to_le16(req->koffset >> 16));
+ if (idx < 0)
+ return idx;
if (req_opcode(req->info.ctrl) == EXPECTED) {
__le16 val;

@@ -1310,10 +1326,13 @@ static int set_txreq_header_ahg(struct user_sdma_request *req,
KDETH_OM_MAX_SIZE) ? KDETH_OM_LARGE_SHIFT :
KDETH_OM_SMALL_SHIFT;
/* KDETH.OM and KDETH.OFFSET (TID) */
- AHG_HEADER_SET(ahg, diff, 7, 0, 16,
- ((!!(omfactor - KDETH_OM_SMALL_SHIFT)) << 15 |
+ idx = ahg_header_set(
+ ahg, idx, array_size, 7, 0, 16,
+ ((!!(omfactor - KDETH_OM_SMALL_SHIFT)) << 15 |
((req->tidoffset >> omfactor)
- & 0x7fff)));
+ & 0x7fff)));
+ if (idx < 0)
+ return idx;
/* KDETH.TIDCtrl, KDETH.TID, KDETH.Intr, KDETH.SH */
val = cpu_to_le16(((EXP_TID_GET(tidval, CTRL) & 0x3) << 10) |
(EXP_TID_GET(tidval, IDX) & 0x3ff));
@@ -1330,21 +1349,22 @@ static int set_txreq_header_ahg(struct user_sdma_request *req,
AHG_KDETH_INTR_SHIFT));
}

- AHG_HEADER_SET(ahg, diff, 7, 16, 14, val);
+ idx = ahg_header_set(ahg, idx, array_size,
+ 7, 16, 14, (__force u16)val);
+ if (idx < 0)
+ return idx;
}
- if (diff < 0)
- return diff;

trace_hfi1_sdma_user_header_ahg(pq->dd, pq->ctxt, pq->subctxt,
req->info.comp_idx, req->sde->this_idx,
- req->ahg_idx, ahg, diff, tidval);
+ req->ahg_idx, ahg, idx, tidval);
sdma_txinit_ahg(&tx->txreq,
SDMA_TXREQ_F_USE_AHG,
- datalen, req->ahg_idx, diff,
+ datalen, req->ahg_idx, idx,
ahg, sizeof(req->hdr),
user_sdma_txreq_cb);

- return diff;
+ return idx;
}

/*
diff --git a/drivers/infiniband/hw/hfi1/user_sdma.h b/drivers/infiniband/hw/hfi1/user_sdma.h
index 9b8bb56..a3d1924 100644
--- a/drivers/infiniband/hw/hfi1/user_sdma.h
+++ b/drivers/infiniband/hw/hfi1/user_sdma.h
@@ -80,15 +80,26 @@
#define PBC2LRH(x) ((((x) & 0xfff) << 2) - 4)
#define LRH2PBC(x) ((((x) >> 2) + 1) & 0xfff)

-#define AHG_HEADER_SET(arr, idx, dw, bit, width, value) \
- do { \
- if ((idx) < ARRAY_SIZE((arr))) \
- (arr)[(idx++)] = sdma_build_ahg_descriptor( \
- (__force u16)(value), (dw), (bit), \
- (width)); \
- else \
- return -ERANGE; \
- } while (0)
+/**
+ * Build an SDMA AHG header update descriptor and save it to an array.
+ * @arr - Array to save the descriptor to.
+ * @idx - Index of the array at which the descriptor will be saved.
+ * @array_size - Size of the array arr.
+ * @dw - Update index into the header in DWs.
+ * @bit - Start bit.
+ * @width - Field width.
+ * @value - 16 bits of immediate data to write into the field.
+ * Returns -ERANGE if idx is invalid. If successful, returns the next index
+ * (idx + 1) of the array to be used for the next descriptor.
+ */
+static inline int ahg_header_set(u32 *arr, int idx, size_t array_size,
+ u8 dw, u8 bit, u8 width, u16 value)
+{
+ if ((size_t)idx >= array_size)
+ return -ERANGE;
+ arr[idx++] = sdma_build_ahg_descriptor(value, dw, bit, width);
+ return idx;
+}

/* Tx request flag bits */
#define TXREQ_FLAGS_REQ_ACK BIT(0) /* Set the ACK bit in the header */