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c29214677a
Add an ability to query if the zcrx rx page size setting is available. Note, even when the API is supported by io_uring, the registration can still get rejected for various reasons, e.g. when the NIC or the driver doesn't support it, when the particular specified size is unsupported, when the memory area doesn't satisfy all requirements, etc. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "linux/io_uring/query.h"
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#include "query.h"
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#include "io_uring.h"
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#include "zcrx.h"
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union io_query_data {
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struct io_uring_query_opcode opcodes;
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struct io_uring_query_zcrx zcrx;
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struct io_uring_query_scq scq;
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};
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#define IO_MAX_QUERY_SIZE sizeof(union io_query_data)
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#define IO_MAX_QUERY_ENTRIES 1000
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static ssize_t io_query_ops(union io_query_data *data)
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{
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struct io_uring_query_opcode *e = &data->opcodes;
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e->nr_request_opcodes = IORING_OP_LAST;
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e->nr_register_opcodes = IORING_REGISTER_LAST;
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e->feature_flags = IORING_FEAT_FLAGS;
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e->ring_setup_flags = IORING_SETUP_FLAGS;
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e->enter_flags = IORING_ENTER_FLAGS;
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e->sqe_flags = SQE_VALID_FLAGS;
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e->nr_query_opcodes = __IO_URING_QUERY_MAX;
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e->__pad = 0;
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return sizeof(*e);
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}
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static ssize_t io_query_zcrx(union io_query_data *data)
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{
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struct io_uring_query_zcrx *e = &data->zcrx;
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e->register_flags = ZCRX_REG_IMPORT;
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e->area_flags = IORING_ZCRX_AREA_DMABUF;
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e->nr_ctrl_opcodes = __ZCRX_CTRL_LAST;
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e->rq_hdr_size = sizeof(struct io_uring);
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e->rq_hdr_alignment = L1_CACHE_BYTES;
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e->features = ZCRX_FEATURE_RX_PAGE_SIZE;
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e->__resv2 = 0;
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return sizeof(*e);
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}
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static ssize_t io_query_scq(union io_query_data *data)
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{
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struct io_uring_query_scq *e = &data->scq;
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e->hdr_size = sizeof(struct io_rings);
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e->hdr_alignment = SMP_CACHE_BYTES;
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return sizeof(*e);
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}
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static int io_handle_query_entry(union io_query_data *data, void __user *uhdr,
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u64 *next_entry)
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{
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struct io_uring_query_hdr hdr;
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size_t usize, res_size = 0;
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ssize_t ret = -EINVAL;
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void __user *udata;
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if (copy_from_user(&hdr, uhdr, sizeof(hdr)))
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return -EFAULT;
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usize = hdr.size;
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hdr.size = min(hdr.size, IO_MAX_QUERY_SIZE);
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udata = u64_to_user_ptr(hdr.query_data);
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if (hdr.query_op >= __IO_URING_QUERY_MAX) {
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ret = -EOPNOTSUPP;
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goto out;
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}
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if (!mem_is_zero(hdr.__resv, sizeof(hdr.__resv)) || hdr.result || !hdr.size)
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goto out;
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if (copy_from_user(data, udata, hdr.size))
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return -EFAULT;
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switch (hdr.query_op) {
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case IO_URING_QUERY_OPCODES:
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ret = io_query_ops(data);
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break;
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case IO_URING_QUERY_ZCRX:
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ret = io_query_zcrx(data);
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break;
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case IO_URING_QUERY_SCQ:
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ret = io_query_scq(data);
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break;
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}
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if (ret >= 0) {
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if (WARN_ON_ONCE(ret > IO_MAX_QUERY_SIZE))
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return -EFAULT;
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res_size = ret;
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ret = 0;
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}
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out:
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hdr.result = ret;
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hdr.size = min_t(size_t, usize, res_size);
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if (copy_struct_to_user(udata, usize, data, hdr.size, NULL))
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return -EFAULT;
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if (copy_to_user(uhdr, &hdr, sizeof(hdr)))
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return -EFAULT;
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*next_entry = hdr.next_entry;
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return 0;
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}
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int io_query(void __user *arg, unsigned nr_args)
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{
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union io_query_data entry_buffer;
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void __user *uhdr = arg;
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int ret, nr = 0;
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memset(&entry_buffer, 0, sizeof(entry_buffer));
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if (nr_args)
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return -EINVAL;
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while (uhdr) {
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u64 next_hdr;
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ret = io_handle_query_entry(&entry_buffer, uhdr, &next_hdr);
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if (ret)
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return ret;
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uhdr = u64_to_user_ptr(next_hdr);
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/* Have some limit to avoid a potential cycle */
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if (++nr >= IO_MAX_QUERY_ENTRIES)
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return -ERANGE;
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if (fatal_signal_pending(current))
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return -EINTR;
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cond_resched();
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}
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return 0;
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}
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