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flow, tcp: Add flow-centric dispatch for deferred flow handling

Browse source 
tcp_defer_handler(), amongst other things, scans the flow table and does
some processing for each TCP connection.  When we add other protocols to
the flow table, they're likely to want some similar scanning.  It makes
more sense for cache friendliness to perform a single scan of the flow
table and dispatch to the protocol specific handlers, rather than having
each protocol separately scan the table.

To that end, add a new flow_defer_handler() handling all flow-linked
deferred operations.

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 2024-01-16 11:50:35 +11:00 • committed by Stefano Brivio
parent c97bb527d6
commit b43e4483ed
5 changed files with 28 additions and 17 deletions

19
tcp.c
View file

@ -1307,7 +1307,7 @@ static struct tcp_tap_conn *tcp_hash_lookup(const struct ctx *c,
* @c: Execution context
* @flow: Flow table entry for this connection
*/
static void tcp_flow_defer(struct ctx *c, union flow *flow)
void tcp_flow_defer(struct ctx *c, union flow *flow)
{
const struct tcp_tap_conn *conn = &flow->tcp;
@ -1365,26 +1365,11 @@ static void tcp_l2_data_buf_flush(const struct ctx *c)
* tcp_defer_handler() - Handler for TCP deferred tasks
* @c: Execution context
*/
/* cppcheck-suppress [constParameterPointer, unmatchedSuppression] */
void tcp_defer_handler(struct ctx *c)
{
union flow *flow;
tcp_l2_flags_buf_flush(c);
tcp_l2_data_buf_flush(c);
for (flow = flowtab + c->flow_count - 1; flow >= flowtab; flow--) {
switch (flow->f.type) {
case FLOW_TCP:
tcp_flow_defer(c, flow);
break;
case FLOW_TCP_SPLICE:
tcp_splice_flow_defer(c, flow);
break;
default:
die("Unexpected %s in tcp_defer_handler()",
FLOW_TYPE(&flow->f));
}
}
}
/**