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sfc: add ability for extra channels to receive raw RX buffers

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The TC extra channel will need its own special RX handling, which must
 operate before any code that expects the RX buffer to contain a network
 packet; buffers on this RX queue contain MAE counter packets in a
 special format that does not resemble an Ethernet frame, and many fields
 of the RX packet prefix are not populated.
The USER_MARK field, however, is populated with the generation count from
 the counter subsystem, which needs to be passed on to the RX handler.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2022-11-14 13:15:53 +00:00 committed by David S. Miller
parent 85697f97fd
commit 36df6136a7
2 changed files with 9 additions and 0 deletions
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7
drivers/net/ethernet/sfc/ef100_rx.c
View File

@ -67,6 +67,13 @@ void __ef100_rx_packet(struct efx_channel *channel)
prefix = (u32 *)(eh - ESE_GZ_RX_PKT_PREFIX_LEN);
if (channel->type->receive_raw) {
u32 mark = PREFIX_FIELD(prefix, USER_MARK);
if (channel->type->receive_raw(rx_queue, mark))
return; /* packet was consumed */
}
if (ef100_has_fcs_error(channel, prefix) &&
unlikely(!(efx->net_dev->features & NETIF_F_RXALL)))
goto out;

2
drivers/net/ethernet/sfc/net_driver.h
View File

@ -593,6 +593,7 @@ struct efx_msi_context {
* @copy: Copy the channel state prior to reallocation. May be %NULL if
* reallocation is not supported.
* @receive_skb: Handle an skb ready to be passed to netif_receive_skb()
* @receive_raw: Handle an RX buffer ready to be passed to __efx_rx_packet()
* @want_txqs: Determine whether this channel should have TX queues
* created. If %NULL, TX queues are not created.
* @keep_eventq: Flag for whether event queue should be kept initialised
@ -609,6 +610,7 @@ struct efx_channel_type {
void (*get_name)(struct efx_channel *, char *buf, size_t len);
struct efx_channel *(*copy)(const struct efx_channel *);
bool (*receive_skb)(struct efx_channel *, struct sk_buff *);
bool (*receive_raw)(struct efx_rx_queue *, u32);
bool (*want_txqs)(struct efx_channel *);
bool keep_eventq;
bool want_pio;