net: stmmac: Add TX via XDP zero-copy socket
We add the support of XDP ZC TX submission and cleaning into stmmac_tx_clean(). The function is made to clean as many TX complete frames as possible, i.e. limit by priv->dma_tx_size instead of NAPI budget. For TX ring that is associated with XSK pool, the function stmmac_xdp_xmit_zc() is introduced to TX frame buffers from XSK pool by using xsk_tx_peek_desc(). To make stmmac_tx_clean() support the cleaning of XSK TX frames, STMMAC_TXBUF_T_XSK_TX TX buffer type is introduced. As stmmac_tx_clean() uses the return value to cue whether NAPI function should continue to poll, we augment the caller of stmmac_tx_clean() to pass NAPI budget instead of priv->dma_tx_size through 'budget' input and made stmmac_tx_clean() to always clean up-to the TX ring size instead. This allows us to use the return boolean status of stmmac_xdp_xmit_zc() to decide if XSK TX work is done or not: If true, set 'xmits' to return 'budget - 1' so that NAPI poll may exit. Else, set 'xmits' to return 'budget' to make NAPI poll continue to poll since XSK TX work is not done. Finally, at the end of stmmac_tx_clean(), the function now take a maximum value between 'count' and 'xmits' so that status from both TX cleaning and XSK TX (only for XDP ZC) is considered. This patch adds a new NAPI poll called stmmac_napi_poll_rxtx() that is meant to be enabled/disabled for RX and TX ring that are bound to XSK pool. This NAPI poll function starts with cleaning TX ring, then submits XSK TX frames to TX ring before proceed to perform RX operations, i.e. , receiving RX frames and replenishing RX ring with RX free buffers obtained from XSK pool. Therefore, during XSK RX and TX setup, the driver enables stmmac_napi_poll_rxtx() for RX and TX operations, then during XSK RX and TX pool tear-down, the driver reenables the exisiting independent NAPI poll functions accordingly: stmmac_napi_poll_rx() and stmmac_napi_poll_tx(). Signed-off-by:Ong Boon Leong <boon.leong.ong@intel.com> Signed-off-by: