[PATCH 0/2 for-next] A few fdinfo tweaks

[PATCH 0/2 for-next] A few fdinfo tweaks

[Jens Axboe]

Hi,

A tiny cleanup, and then a patch that fixes SQE dumping for SQE128 and
also adds a few more sqe fields in general.

-- 
Jens Axboe

[PATCH 1/2] io_uring/fdinfo: get rid of unnecessary is_cqe32 variable

[Jens Axboe]

We already have the cq_shift, just use that to tell if we have doubly
sized CQEs or not.

While in there, cleanup the CQE32 vs normal CQE size printing.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/fdinfo.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c
index b29e2d02216f..d341e73022b1 100644
--- a/io_uring/fdinfo.c
+++ b/io_uring/fdinfo.c
@@ -62,10 +62,9 @@ static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
 	unsigned int cq_shift = 0;
 	unsigned int sq_entries, cq_entries;
 	bool has_lock;
-	bool is_cqe32 = (ctx->flags & IORING_SETUP_CQE32);
 	unsigned int i;
 
-	if (is_cqe32)
+	if (ctx->flags & IORING_SETUP_CQE32)
 		cq_shift = 1;
 
 	/*
@@ -102,16 +101,13 @@ static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
 		unsigned int entry = i + cq_head;
 		struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift];
 
-		if (!is_cqe32) {
-			seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n",
+		seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x",
 			   entry & cq_mask, cqe->user_data, cqe->res,
 			   cqe->flags);
-		} else {
-			seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x, "
-				"extra1:%llu, extra2:%llu\n",
-				entry & cq_mask, cqe->user_data, cqe->res,
-				cqe->flags, cqe->big_cqe[0], cqe->big_cqe[1]);
-		}
+		if (cq_shift)
+			seq_printf(m, ", extra1:%llu, extra2:%llu\n",
+					cqe->big_cqe[0], cqe->big_cqe[1]);
+		seq_printf(m, "\n");
 	}
 
 	/*
-- 
2.35.1

[PATCH 2/2] io_uring/fdinfo: fix sqe dumping for IORING_SETUP_SQE128

[Jens Axboe]

If we have doubly sized SQEs, then we need to shift the sq index by 1
to account for using two entries for a single request. The CQE dumping
gets this right, but the SQE one does not.

Improve the SQE dumping in general, the information dumped is pretty
sparse and doesn't even cover the whole basic part of the SQE. Include
information on the extended part of the SQE, if doubly sized SQEs are
in use. A typical dump now looks like the following:

[...]
SQEs:	32
   32: opcode:URING_CMD, fd:0, flags:1, off:3225964160, addr:0x0, rw_flags:0x0, buf_index:0 user_data:2721, e0:0x0, e1:0xffffb8041000, e2:0x100000000000, e3:0x5500, e4:0x7, e5:0x0, e6:0x0, e7:0x0
   33: opcode:URING_CMD, fd:0, flags:1, off:3225964160, addr:0x0, rw_flags:0x0, buf_index:0 user_data:2722, e0:0x0, e1:0xffffb8043000, e2:0x100000000000, e3:0x5508, e4:0x7, e5:0x0, e6:0x0, e7:0x0
   34: opcode:URING_CMD, fd:0, flags:1, off:3225964160, addr:0x0, rw_flags:0x0, buf_index:0 user_data:2723, e0:0x0, e1:0xffffb8045000, e2:0x100000000000, e3:0x5510, e4:0x7, e5:0x0, e6:0x0, e7:0x0
[...]

Fixes: ebdeb7c01d02 ("io_uring: add support for 128-byte SQEs")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/fdinfo.c | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c
index d341e73022b1..4eae088046d0 100644
--- a/io_uring/fdinfo.c
+++ b/io_uring/fdinfo.c
@@ -60,12 +60,15 @@ static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
 	unsigned int cq_head = READ_ONCE(r->cq.head);
 	unsigned int cq_tail = READ_ONCE(r->cq.tail);
 	unsigned int cq_shift = 0;
+	unsigned int sq_shift = 0;
 	unsigned int sq_entries, cq_entries;
 	bool has_lock;
 	unsigned int i;
 
 	if (ctx->flags & IORING_SETUP_CQE32)
 		cq_shift = 1;
+	if (ctx->flags & IORING_SETUP_SQE128)
+		sq_shift = 1;
 
 	/*
 	 * we may get imprecise sqe and cqe info if uring is actively running
@@ -81,19 +84,36 @@ static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
 	seq_printf(m, "CqHead:\t%u\n", cq_head);
 	seq_printf(m, "CqTail:\t%u\n", cq_tail);
 	seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail);
-	seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head);
+	seq_printf(m, "SQEs:\t%u\n", sq_tail - sq_head);
 	sq_entries = min(sq_tail - sq_head, ctx->sq_entries);
 	for (i = 0; i < sq_entries; i++) {
 		unsigned int entry = i + sq_head;
-		unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
 		struct io_uring_sqe *sqe;
+		unsigned int sq_idx;
 
+		sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
 		if (sq_idx > sq_mask)
 			continue;
-		sqe = &ctx->sq_sqes[sq_idx];
-		seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n",
-			   sq_idx, sqe->opcode, sqe->fd, sqe->flags,
-			   sqe->user_data);
+		sqe = &ctx->sq_sqes[sq_idx << 1];
+		seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, "
+			      "addr:0x%llx, rw_flags:0x%x, buf_index:%d "
+			      "user_data:%llu",
+			   sq_idx, io_uring_get_opcode(sqe->opcode), sqe->fd,
+			   sqe->flags, (unsigned long long) sqe->off,
+			   (unsigned long long) sqe->addr, sqe->rw_flags,
+			   sqe->buf_index, sqe->user_data);
+		if (sq_shift) {
+			u64 *sqeb = (void *) (sqe + 1);
+			int size = sizeof(struct io_uring_sqe) / sizeof(u64);
+			int j;
+
+			for (j = 0; j < size; j++) {
+				seq_printf(m, ", e%d:0x%llx", j,
+						(unsigned long long) *sqeb);
+				sqeb++;
+			}
+		}
+		seq_printf(m, "\n");
 	}
 	seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head);
 	cq_entries = min(cq_tail - cq_head, ctx->cq_entries);
-- 
2.35.1