On 2023-09-28 13:21 +0200, Simon Horman wrote:
> On Wed, Sep 20, 2023 at 08:56:57PM +0800, Liang Chen wrote:
> > When specifying an unknown flag, it will print all available flags.
> > Currently, these flags are provided as fixed strings, which requires
> > manual updates when flags change. Replacing it with automated flag
> > enumeration.
> >
> > Signed-off-by: Liang Chen <liangchen.linux@xxxxxxxxx>
> > Signed-off-by: Benjamin Poirier <bpoirier@xxxxxxxxxx>
> > ---
> > Changes from v3:
> > - check "n == IPSEC_SHIFT" instead of string comparison
> > - use snprintf and check that the result does not overrun pkg_dev->result[]
> > - avoid double '\n' at the end
^
[...]
> > - } else {
> > - sprintf(pg_result,
> > - "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
> > - f,
> > - "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
> > - "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, "
> > - "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, "
> > - "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
> > - "NO_TIMESTAMP, "
> > -#ifdef CONFIG_XFRM
> > - "IPSEC, "
> > -#endif
> > - "NODE_ALLOC\n");
> > +
> > + sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
> > return count;
> > }
> > - sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
> > +
> > + /* Unknown flag */
> > + end = pkt_dev->result + sizeof(pkt_dev->result);
> > + pg_result += sprintf(pg_result,
> > + "Flag -:%s:- unknown\n"
> > + "Available flags, (prepend ! to un-set flag):\n", f);
> > +
> > + for (int n = 0; n < NR_PKT_FLAGS && pg_result < end; n++) {
> > + if (!IS_ENABLED(CONFIG_XFRM) && n == IPSEC_SHIFT)
> > + continue;
> > + pg_result += snprintf(pg_result, end - pg_result,
> > + "%s, ", pkt_flag_names[n]);
> > + }
> > + if (!WARN_ON_ONCE(pg_result >= end)) {
> > + /* Remove the comma and whitespace at the end */
> > + *(pg_result - 2) = '\0';
>
> Hi Liang Chen,
>
> Should the string have a trailing '\n' in keeping with the current formatting?
A '\n' is already added when the string is output by pktgen_if_show() so
if the string above has a trailing '\n', it leads to an empty line in
the output.
If my count is correct, before this patch there are 56 cases that output
to pkt_dev->result/pg_result in pktgen_if_write() and only 3 of them
include a trailing '\n', arguably by mistake.
So, I think it's better to remove the empty line than to keep the
current formatting.
