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flow, tcp: Consolidate flow pointer<->index helpers

Both tcp.c and tcp_splice.c define CONN_IDX() variants to find the index
of their connection structures in the connection table, now become the
unified flow table.  We can easily combine these into a common helper.
While we're there, add some trickery for some additional type safety.

They also define their own CONN() versions, which aren't so easily combined
since they need to return different types, but we can have them use a
common helper.

In the process, we standardise on always using an unsigned type to store
the connection / flow index, which makes more sense.  tcp.c's conn_at_idx()
remains for now, but we change its parameter to unsigned to match.  That in
turn means we can remove a check for negative values from it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2023-11-30 13:02:10 +11:00 committed by Stefano Brivio
parent f08ce92a13
commit e2e8219f13
4 changed files with 69 additions and 46 deletions

View file

@ -40,7 +40,7 @@ struct tcp_tap_conn {
struct flow_common f;
bool in_epoll :1;
int next_index :FLOW_INDEX_BITS + 2;
unsigned next_index :FLOW_INDEX_BITS + 2;
#define TCP_RETRANS_BITS 3
unsigned int retrans :TCP_RETRANS_BITS;