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Message-Id: <20230216140043.109345-3-tirthendu.sarkar@intel.com> Date: Thu, 16 Feb 2023 19:30:37 +0530 From: Tirthendu Sarkar <tirthendu.sarkar@...el.com> To: intel-wired-lan@...ts.osuosl.org Cc: jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com, netdev@...r.kernel.org, bpf@...r.kernel.org, magnus.karlsson@...el.com, maciej.fijalkowski@...el.com, tirthendu.sarkar@...el.com Subject: [PATCH intel-next v5 2/8] i40e: change Rx buffer size for legacy-rx to support XDP multi-buffer Adding support for XDP multi-buffer entails adding information of all the fragments of the packet in the xdp_buff. This approach implies that underlying buffer has to provide tailroom for skb_shared_info. In the legacy-rx mode, driver can only configure upto 2k sized Rx buffers and with the current configuration of 2k sized Rx buffers there is no way to do tailroom reservation for skb_shared_info. Hence size of Rx buffers is now lowered to 1664 (2k - sizeof(skb_shared_info)). Also, driver can only chain upto 5 Rx buffers and this means max MTU supported for legacy-rx is now 8320. Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@...el.com> --- drivers/net/ethernet/intel/i40e/i40e_main.c | 2 +- drivers/net/ethernet/intel/i40e/i40e_txrx.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 1c7b1f4d4936..3c387f6037d5 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -2903,7 +2903,7 @@ static void i40e_sync_filters_subtask(struct i40e_pf *pf) static u16 i40e_calculate_vsi_rx_buf_len(struct i40e_vsi *vsi) { if (!vsi->netdev || (vsi->back->flags & I40E_FLAG_LEGACY_RX)) - return I40E_RXBUFFER_2048; + return I40E_RXBUFFER_1664; return PAGE_SIZE < 8192 ? I40E_RXBUFFER_3072 : I40E_RXBUFFER_2048; } diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h index 768290dc6f48..1382efb43ffd 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h @@ -97,6 +97,7 @@ enum i40e_dyn_idx_t { /* Supported Rx Buffer Sizes (a multiple of 128) */ #define I40E_RXBUFFER_256 256 #define I40E_RXBUFFER_1536 1536 /* 128B aligned standard Ethernet frame */ +#define I40E_RXBUFFER_1664 1664 /* For legacy Rx with tailroom for frags */ #define I40E_RXBUFFER_2048 2048 #define I40E_RXBUFFER_3072 3072 /* Used for large frames w/ padding */ #define I40E_MAX_RXBUFFER 9728 /* largest size for single descriptor */ -- 2.34.1
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